DE102019008054A1 - Process for the production of a plate provided with an edge protection, a frame arrangement suitable for this and a plate provided with an edge protection from such a frame arrangement - Google Patents

Abstract

A method is proposed for the production of a plate provided with an edge protection, comprising - a core plate with an upper side, an underside and lateral cut surfaces; the core plate overlapping first leg and a second leg extending parallel to the cut surface of the core plate; and an inner profile part made of plasticizable plastic material which forms an inner frame of the edge protection and has a central section, a first leg extending from the central section and overlapping the core plate on its underside, and a second leg extending from the central section in the opposite direction Having legs; - wherein the first leg of the outer profile part and the first leg of the inner profile part accommodate the edge area of the core plate between them and the outer profile part of the outer frame is welded to the inner profile part of the inner frame,

Description

• - eine Kernplatte mit einer Oberseite, einer Unterseite und seitlichen Schnittflächen;
• - ein einen Außenrahmen des Kantenschutzes bildendes äußeres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das äußere Profilteil ein L-Profil mit einem die Oberseite der Kernplatte übergreifenden ersten Schenkel und mit einem sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte (1) erstreckenden zweiten Schenkel aufweist; und
• - ein einen Innenrahmen des Kantenschutzes bildendes inneres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das innere Profilteil einen zentralen Abschnitt, einen sich von dem zentralen Abschnitt fort erstreckenden, die Kernplatte an ihrer Unterseite übergreifenden ersten Schenkel und einen sich von dem zentralen Abschnitt fort in die entgegengesetzte Richtung erstreckenden zweiten Schenkel aufweist;
• - wobei der erste Schenkel des äußeren Profilteils und der erste Schenkel des inneren Profilteils den Randbereich der Kernplatte zwischen sich aufnehmen und das äußere Profilteil des Außenrahmens mit dem inneren Profilteil des Innenrahmens verschweißt ist,

indem die Kernplatte in das äußere Profilteil eingelegt, das innere Profilteil auf die Kernplatte und das äußere Profilteil aufgelegt und in das innere Profilteil Ultraschall eingeleitet wird, um das innere Profilteil des Innenrahmens mit dem äußeren Profilteil des Außenrahmens zu verschweißen.The invention relates to a method for producing a plate provided with edge protection, in particular in the form of a table or cover plate

• a core plate with a top, a bottom and side cut surfaces;
• - An outer profile part, which forms an outer frame of the edge protection, made of plasticizable plastic material, the outer profile part being an L-profile with a first leg that extends over the top of the core plate and with an essentially parallel to the cut surface of the core plate ( 1 ) has extending second leg; and
• an inner profile part made of plasticizable plastic material and forming an inner frame of the edge protection, the inner profile part having a central section, a first leg extending from the central section, overlapping the core plate on its underside, and a first leg extending from the central section in the opposite direction having extending second leg;
• - wherein the first leg of the outer profile part and the first leg of the inner profile part accommodate the edge area of the core plate between them and the outer profile part of the outer frame is welded to the inner profile part of the inner frame,

by inserting the core plate into the outer profile part, placing the inner profile part on the core plate and the outer profile part and introducing ultrasound into the inner profile part in order to weld the inner profile part of the inner frame to the outer profile part of the outer frame.

• - ein einen Außenrahmen des Kantenschutzes bildendes äußeres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das äußere Profilteil ein L-Profil aufweist, dessen erster Schenkel zum Übergreifen der Oberseite der Kernplatte ausgebildet ist und dessen zweiter Schenkel zur im Wesentlichen zu der Schnittfläche der Kernplatte parallelen Anordnung ausgebildet ist; und
• - ein einen Innenrahmen des Kantenschutzes bildendes inneres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das innere Profilteil einen zentralen Abschnitt, einen sich von dem zentralen Abschnitt fort erstreckenden ersten Schenkel, welcher zum Übergreifen der Unterseite der Kernplatte ausgebildet ist, und einen sich von dem zentralen Abschnitt fort in die entgegengesetzte Richtung erstreckenden zweiten Schenkel aufweist;
• - wobei der erste Schenkel des äußeren Profilteils und der erste Schenkel des inneren Profilteils zur Aufnahme des Randbereiches der Kernplatte zwischen sich ausgebildet sind und das innere Profilteil mit dem äußeren Profilteil verschweißbar ist, wenn die Kernplatte in das äußere Profilteil eingelegt und das innere Profilteil auf die Kernplatte und das äußere Profilteil aufgelegt worden ist.

The invention further relates to a frame arrangement suitable for producing an edge protection of a core plate according to such a method, comprising

• - An outer profile part of plasticizable plastic material forming an outer frame of the edge protection, the outer profile part having an L-profile, the first leg of which is designed to overlap the top of the core plate and the second leg of which is designed to be arranged essentially parallel to the cut surface of the core plate ; and
• an inner profile part made of plasticizable plastic material and forming an inner frame of the edge protection, the inner profile part having a central section, a first leg extending from the central section, which is designed to overlap the underside of the core plate, and one extending away from the central section having second legs extending in the opposite direction;
• - The first leg of the outer profile part and the first leg of the inner profile part for receiving the edge area of the core plate are formed between them and the inner profile part can be welded to the outer profile part when the core plate is inserted into the outer profile part and the inner profile part on the Core plate and the outer profile part has been placed.

Finally, the invention relates to a plate, in particular in the form of a table or cover plate, with an edge protection which has a frame arrangement of the aforementioned type in which the core plate is received between the first leg of the outer profile part and the first leg of the inner profile part.

Such plates provided with edge protection made of plasticizable, ie thermoplastic and / or thermoelastic, plastic materials are mainly used as table tops and as cover plates, in particular for household appliances such as washing machines, tumble dryers, dishwashers, refrigerators and the like. The edge protection essentially has the following tasks: On the one hand, it should protect the edge-side cut surfaces of the core plate from mechanical damage and, on the other hand, it should protect the user from injuries at the cut surfaces of the plate. If the core plate, as is often the case, is made of a wood material, such as a pressboard, the open-pored cut surfaces of such a core plate should also be protected against the ingress of dirt and, in particular, moisture, which could lead to swelling and swelling Deformation of the core plate can lead. Finally, the edge protection should also facilitate the grip of the plate and consequently the handling and transportability of a household appliance provided with such a cover plate. In the case of the latter, the cover plate usually also serves as a storage and work surface, with the further aim of covering and sealing the gap between the cover plate and the actual device housing with a downwardly drawn edge protector. In addition, in the latter case, functional parts such as supports, locking and / or retaining hooks, screw or fastening straps, clips or the like are formed on the underside of the core plate and / or on one of the two profile parts of the edge protection, by means of which the cover plate can be set on the housing of the household appliance and which can also be covered by the edge protection for aesthetic reasons.

The profile parts of the outer and inner frame of the edge protection itself can be designed in particular as injection molded parts made of thermoplastic or thermoelastic plastic materials that can be plasticized under heat and / or pressure, which should have both sufficient mechanical stability and high resistance and durability to the effects of moisture.

For the production of panels provided with edge protection made of plasticizable plastic materials, it is known, for example, to inject the plastic provided for the edge protection into an injection molding tool into which the prefabricated core plate, cut to the desired size, has been inserted so that the open-pored cut edges of the core plate are overmolded and the plasticized plastic penetrates the pores in order to interlock the edge protection with the core plate. For the reasons mentioned above, the mold space of the injection molding tool can in particular be designed in such a way that the molded-on edge protection overlaps at least the upper side of the core plate. This results in a firm and at the same time tight connection between the edge protection and the core plate. Instead, it is also known to manufacture the edge protection in a separate operation, such as by injection molding or extrusion of a strip-like profile, and to connect it to the core plate in a further operation by gluing. Although both methods offer effective edge protection, there is a major disadvantage in both cases, in particular, that the edge protection can no longer be removed afterwards. This problem arises for environmental reasons if the table or cover plate is damaged or otherwise worthless or unusable and is to be recycled or the manufacturer is obliged to take it back (this is for example provided for many household appliances including refrigerated cabinets), who then has to take care of the disposal and, if necessary, recycling. It is then particularly necessary to separate the materials according to type, although the reusable edge protector with its high proportion of plastic cannot be separated from the core plate or can only be separated with great difficulty.

With regard to an environmentally friendly edge protection that can be easily separated from the core panel when the table top or cover plate is disposed of, methods have therefore proven useful in which a two-part edge protection with an outer frame in the form of an outer profile part and an inner frame in the form of an inner profile part are used which each reach over or under the core plate and which are welded to one another along at least two circumferential connecting lines ( DE 42 04 161 A1 , DE 44 06 118 A1 ). The outer frame of such an edge protection comprises an outer profile part made of plasticizable plastic material, the outer profile part having an L-profile with a first leg extending over the top of the core plate and with a second leg extending essentially parallel to the cut surface of the core plate. The angle between the two legs does not necessarily have to be exactly 90 °, but can also deviate from this, for example by up to about 30 °, if an extension of the edge protection from the top of the core plate obliquely outwards and downwards is desired. The second, essentially edge-parallel leg of the outer profile part can furthermore preferably be longer than the first, essentially plate-parallel leg, which overlaps the top of the plate and which in particular adjoins it, in order to protrude downward beyond the underside of the plate. The inner frame of such an edge protection comprises an inner profile part made of plasticizable plastic material, which has a central section extending essentially parallel to the cut surface of the core plate or to the second leg of the outer profile part and arranged between the second leg of the outer profile part and the cut surface of the core plate having. In this context, too, it should be noted that the central section of the inner profile part does not necessarily have to extend exactly parallel to the edge-side cut surface of the core plate, but can also be inclined at an angle of, for example, up to about 30 °, provided that between the Edge of the core plate and the second leg of the outer profile part there is enough space. From the central section of the inner profile part, on the one hand, a first leg extends across the core plate on its underside, for example essentially perpendicular to the central portion; on the other hand, a second leg extends from the central portion of the inner profile part in the opposite direction - ie outwards in the direction of the second leg of the outer profile part - for example again essentially perpendicular to the central section.

When the plate is fully assembled, the first leg of the outer profile part and the first leg of the inner profile part hold the edge area of the core plate between them, with at least the end area of the second leg of the inner profile part covering the core plate at the edge. The inner and outer profile part of the inner and outer frame of the edge protector are also of this type on their mutually facing legs connected to one another that on the one hand the free end of the central section of the inner profile part, which extends parallel to the cut surface of the core plate, is welded to the first leg of the outer profile part, on the other hand the free end of the second leg of the inner profile part is welded to the second leg of the outer profile part is. From a procedural point of view, the latter is done in a simple manner in that the core plate is inserted into the outer profile part of the outer frame, the inner profile part of the inner frame is placed on the core plate and the outer profile part and the two profile parts of the outer and inner frame are welded together at the aforementioned points . For this purpose, ultrasonic welding has proven particularly successful, with ultrasound being introduced into the inner profile part in order to weld both the free end of its central section to the first leg of the outer profile part and the free end of its second leg to the second leg of the outer profile part. The introduction of ultrasound takes place in particular by means of sonotrodes, which are applied with a certain pressure that is sufficient to transmit the ultrasound against the outside of the freely accessible second leg of the inner profile part. In this way, edge protection in the form of a frame that is closed on all sides is produced from the outer and inner profile parts that are welded to one another, which has high strength and dimensional stability. The core plate received between the first legs of the outer and inner profile part and the central section of the inner profile part connected to the first leg of the outer profile part is surrounded by a closed frame structure so that its lateral cut surfaces are effectively protected from any external influences. Furthermore, the core plate can be relatively easily detached from the edge protector when it is disposed of, since it is only connected to it in a force-locking manner, but not in a form-locking manner.

However, the introduction of ultrasound into the inner profile part has proven to be problematic, since the ultrasonic energy cannot be transmitted exactly evenly to the intended connection points between the two profile parts of the outer and inner frame, namely on the one hand to the free end of the central section and on the other up to the free end of the second leg of the inner profile part. Occasionally, therefore, the two profile parts of the outer and inner frame are not welded optimally, with the free end of the central section of the inner profile part remote from the ultrasound introduction area occasionally not being stimulated sufficiently and / or not long enough to undergo plasticization the same to enter into a perfect and continuous (circumferential) fusion or welded connection with the first leg of the outer profile part. On the one hand, there can be an at least local gap formation between the core plate and the legs of the profile parts of the outer or inner frame that overlap it, which must be avoided for aesthetic reasons and in particular to prevent the ingress of moisture. On the other hand, at least locally, bulge-like deformations of the legs of the named profile parts that overlap the core plate can occur, which likewise represents a particularly optical deficiency which must be countered. As a result, there is a high level of investigation effort on the occasion of quality assurance and there is a waste that must be avoided for both economic and environmental reasons.

• - eine Kernplatte mit einer Oberseite, einer Unterseite und seitlichen Schnittflächen;
• - ein einen Außenrahmen des Kantenschutzes bildendes äußeres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das äußere Profilteil ein L-Profil mit einem die Oberseite der Kernplatte übergreifenden ersten Schenkel und mit einem sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte erstreckenden zweiten Schenkel aufweist; und
• - ein einen Innenrahmen des Kantenschutzes bildendes inneres Profilteil aus plastifizierbarem Kunststoffmaterial, wobei das innere Profilteil einen sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte bzw. zu dem zweiten Schenkel des äußeren Profilteils erstreckenden und zwischen dem zweiten Schenkel des äußeren Profilteils und der Schnittfläche der Kernplatte angeordneten zentralen Abschnitt, einen sich von dem zentralen Abschnitt fort erstreckenden, die Kernplatte an ihrer Unterseite übergreifenden ersten Schenkel und einen sich von dem zentralen Abschnitt fort in die entgegengesetzte Richtung erstreckenden zweiten Schenkel aufweist,
• - wobei der erste Schenkel des äußeren Profilteils und der erste Schenkel des inneren Profilteils den Randbereich der Kernplatte zwischen sich aufnehmen und einerseits das freie Ende des zentralen Abschnittes des inneren Profilteils, welches die Kernplatte randseitig übergreift, mit dem ersten Schenkel des äußeren Profilteils, andererseits das freie Ende des zweiten Schenkels des inneren Profilteils mit dem zweiten Schenkel des äußeren Profilteils verschweißt ist.

To counter these problems, describes the EP 2 886 001 B1 a generic method for producing a panel provided with an edge protection and a frame arrangement which is suitable for carrying out such a method and forms the edge protection of the panel, comprising:

• a core plate with a top, a bottom and side cut surfaces;
• an outer profile part made of plasticizable plastic material and forming an outer frame of the edge protection, the outer profile part having an L-profile with a first leg extending over the top of the core plate and with a second leg extending essentially parallel to the cut surface of the core plate; and
• An inner profile part made of plasticizable plastic material and forming an inner frame of the edge protection, the inner profile part extending essentially parallel to the cut surface of the core plate or to the second leg of the outer profile part and between the second leg of the outer profile part and the cut surface of the core plate arranged central section, a first leg extending from the central section, overlapping the core plate on its underside, and a second leg extending away from the central section in the opposite direction,
• - The first leg of the outer profile part and the first leg of the inner profile part accommodate the edge area of the core plate between them and on the one hand the free end of the central section of the inner profile part, which overlaps the core plate at the edge the first leg of the outer profile part, on the other hand, the free end of the second leg of the inner profile part is welded to the second leg of the outer profile part.

According to the known method, the core plate is inserted into the outer profile part, the inner profile part is placed on the core plate and the outer profile part and ultrasound is introduced into the inner profile part to connect the free end of the central section of the inner profile part to the first leg of the outer profile part and to weld the free end of the second leg of the inner profile part to the second leg of the outer profile part.

• - Bereitstellen eines äußeren Profilteils, dessen zweiter Schenkel an seiner Innenseite einen Vorsprung aufweist, welcher wenigstens eine Stirnseite mit senkrecht zu dem zweiten Schenkel des äußeren Profilteils angeordneter Erstreckungsrichtungskomponente aufweist;
• - Bereitstellen eines inneren Profilteils, bei welchem der Abstand zwischen dem freien Ende seines zentralen Abschnittes und der dem freien Ende seines zentralen Abschnittes zugewandten Innenseite des freien Endes seines zweiten Schenkels größer ist als der Abstand zwischen dem Vorsprung und der dem Vorsprung zugewandten Innenseite des ersten Schenkels des äußeren Profilteils;
• - Einlegen der Kernplatte in das äußere Profilteil und Auflegen des inneren Profilteils auf die Kernplatte und das äußere Profilteil, bis das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils in Kontakt tritt und zwischen dem freien Ende des zweiten Schenkels des inneren Profilteils und dem am zweiten Schenkel des äußeren Profilteils angeordneten Vorsprung ein Spalt verbleibt;
• - Einleiten von Ultraschall in das innere Profilteil an dessen dem freien Ende seines zentralen Abschnittes abgewandten Seite und Anpressen des inneren Profilteils gegen das äußere Profilteil im Wesentlichen senkrecht zur Erstreckungsrichtung der Kernplatte, wobei zunächst das freie Ende des zentralen Abschnittes des inneren Profilteils mit dem ersten Schenkel des äußeren Profilteils verschweißt wird und sodann mit zunehmender Plastifizierung des freien Endes des zentralen Abschnittes des inneren Profilteils das freie Ende des zweiten Schenkels des inneren Profilteils mit dem Vorsprung des zweiten Schenkels des äußeren Profilteils in Kontakt tritt und ebenfalls mit diesem verschweißt wird.

In order to ensure a continuous welded connection, in particular of the central section of the inner profile part that overlaps the edge of the core plate with the first leg of the outer profile part, which ensures that the cut surface of the core plate is as moisture-proof as possible, but also for a reliable welded connection between the second leg of the inner profile part to take care of the second leg of the outer profile part, sees the EP 2 886 001 B1 perform the following procedural steps:

• - Provision of an outer profile part, the second leg of which has a projection on its inner side, which has at least one end face with an extension direction component arranged perpendicular to the second leg of the outer profile part;
• - Provision of an inner profile part in which the distance between the free end of its central section and the inside of the free end of its second leg facing the free end of its central section is greater than the distance between the projection and the inside of the first leg facing the projection the outer profile part;
• - Inserting the core plate in the outer profile part and placing the inner profile part on the core plate and the outer profile part until the free end of the central portion of the inner profile part comes into contact with the first leg of the outer profile part and between the free end of the second leg of the inner profile part and the projection arranged on the second leg of the outer profile part, a gap remains;
• Introducing ultrasound into the inner profile part on its side facing away from the free end of its central section and pressing the inner profile part against the outer profile part essentially perpendicular to the direction of extension of the core plate, the first leg being the free end of the central section of the inner profile part of the outer profile part is welded and then with increasing plasticization of the free end of the central portion of the inner profile part the free end of the second leg of the inner profile part comes into contact with the projection of the second leg of the outer profile part and is also welded to it.

Due to the different distances on the one hand of the free end of the central section of the inner profile part from the inside of the free end of its second leg facing the free end of its central portion, on the other hand the projection of the outer profile part from the inside of the first leg of the outer profile part facing the projection, A sequential welding is achieved when the inner profile part is welded to the outer profile part fitted with the core plate, whereby first the free end of the central section of the inner profile part is welded to the first leg of the outer profile part (the ultrasound must be used for this purpose via a relatively long distance are passed through the central section of the inner profile part), after which, as soon as a section of the free end of the central section of the inner profile part corresponding to the difference in the different distances is chamfered The second leg of the inner profile part comes into contact with the projection of the first profile part, so that the second leg of the inner profile part is also ultrasonically welded to the second leg of the first profile part (the ultrasound is for this purpose over a relatively short distance passed through the second leg of the inner profile part). The sequential welding compensates in particular for the fact that the welding of the free end of the central section of the inner profile part, which overlaps the cut surface of the core plate, can necessarily be excited less or "worse" with ultrasound than the welding of the second legs of the inner and outer profile part, which is arranged relatively close to the ultrasound source and is located in the near field of the ultrasound excitation, when the ultrasound is coupled into the only accessible point on the side facing away from the core plate in the inner profile part.

However, the known method according to FIG EP 2 886 011 B1 in more ways than not unproblematic. The above-mentioned different distances must meet very tight manufacturing tolerances and the ultrasonic welding process must also take place with very narrow, reproducible welding parameters, so that a secure connection of the free end of the central section of the inner profile part, which overlaps the cut surface of the core plate, with the first Legs of the outer profile part can be ensured in the far field of the ultrasonic excitation. In addition, if the free end of the inner profile part is fused with the first leg of the outer profile part, at least some areas of the outer visible side of the outer profile part can be deformed in the manner of bumps, which should be prevented for aesthetic reasons and which should lead to a committee.

The invention is therefore based on the object of developing a method for producing a plate of the type mentioned at the beginning provided with an edge protection in a simple and inexpensive manner in such a way that, while at least largely avoiding the aforementioned disadvantages, a perfect, permanent and in particular all-round connection of the two profile parts of the Outer and inner frame is guaranteed in particular between the second legs of the outer and inner profile part with a higher process reliability compared to the prior art. It is also based on a frame arrangement of the type mentioned at the outset that is suitable for producing an edge protection of a core plate in accordance with such a method, and on a plate provided with such an edge protection.

• - Bereitstellen eines äußeren Profilteils, welches einen sich im Wesentlichen parallel zu der Schnittfläche der Kernplatte bzw. zu dem zweiten Schenkel des äußeren Profilteils erstreckenden und zwischen dem zweiten Schenkel des äußeren Profilteils und der Schnittfläche der Kernplatte angeordneten Steg aufweist;
• - Einlegen der Kernplatte in das äußere Profilteil und Auflegen des inneren Profilteils auf die Kernplatte und das äußere Profilteil, bis das freie Ende des Steges des äußeren Profilteils mit dem zentralen Abschnitt des inneren Profilteils in Kontakt tritt; und
• - Einleiten von Ultraschall in das innere Profilteil an dessen dem freien Ende des Steges des äußeren Profilteils abgewandten Seite und Anpressen des inneren Profilteils gegen das äußere Profilteil im Wesentlichen senkrecht zur Erstreckungsrichtung der Kernplatte, wobei das freie Ende des Steges des äußeren Profilteils mit dem zentralen Abschnitt des inneren Profilteils verschweißt wird.

From a procedural point of view, this object is achieved with a method of the type mentioned at the outset, which comprises the following steps:

• - Provision of an outer profile part which has a web which extends essentially parallel to the cut surface of the core plate or to the second leg of the outer profile part and is arranged between the second leg of the outer profile part and the cut surface of the core plate;
• - Inserting the core plate into the outer profile part and placing the inner profile part on the core plate and the outer profile part until the free end of the web of the outer profile part comes into contact with the central section of the inner profile part; and
• Introducing ultrasound into the inner profile part at the side facing away from the free end of the web of the outer profile part and pressing the inner profile part against the outer profile part essentially perpendicular to the direction of extension of the core plate, the free end of the web of the outer profile part with the central section of the inner profile part is welded.

In terms of product technology, the invention further provides for solving the problem on which it is based in a frame arrangement of an edge protector of the type mentioned above that is suitable for carrying out such a method, that the outer profile part is essentially parallel to the cut surface of the core plate or to the second leg of the outer profile part and arranged between the second leg of the outer profile part and the cut surface of the core plate, if the core plate in the outer profile part ( 101 ) has been inserted, the length of the web of the outer profile part extending essentially parallel to the cut surface of the core plate being selected such that it comes into contact with the central section of the inner profile part when the inner profile part hits the core plate and the outer profile part has been launched.

Finally, to solve the problem on which it is based, in a plate of the type mentioned above provided with an edge protection, at least the central section of the inner profile part is welded to the free end of the web of the outer profile part.

The configuration according to the invention initially ensures a secure ultrasonic welding of the web provided on the outer profile part with the central section of the inner profile part, which is decisive for the moisture-proof absorption of the cut surface of the core plate between the first leg of the inner profile part and the first leg of the outer profile part by the ultrasonic welding takes place there in the near field because the ultrasound is coupled into the inner profile part on its side facing away from the free end of the web of the outer profile part and the inner profile part is pressed against it. This results in increased process reliability without having to adhere to very tight manufacturing tolerances, the invention - as explained in more detail below - in particular opening up the possibility of also welding the second leg of the inner profile part to the second leg of the outer profile part, which also takes place in the near field of the ultrasonic excitation, so that sequential welding is unnecessary. In addition, deformations on the visible side of the outer profile part are reliably avoided due to the fact that the connection point between the web arranged according to the invention on the outer profile part, which overlaps the cut surface of the core plate, and the central section of the inner profile part occurs far away from the visible side of the outer profile part, so that there is no plasticization of the plastic material during the ultrasonic welding, which can lead to such deformations. Finally, in particular - how also explained in more detail below - the structural design of the inner profile part can be simplified compared to the prior art, so that the latter can be given a high degree of robustness, which ensures that ultrasound can be easily and reliably introduced into the inner profile part. The web provided according to the invention on the outer profile part of the outer frame expediently extends - just like at least the first legs of the inner and outer profile part receiving the core plate between them - continuously around the entire circumference of the outer profile part in order to ensure reliable sealing of the cut surface of the To ensure core plate and in particular to prevent the ingress of moisture.

The thickness of the core plate can preferably be selected such that it is at least slightly smaller than the length of the web of the outer profile part, which extends essentially parallel to the cut surface of the core plate, before it is welded to the central section of the inner profile part. In this way, the best possible contact for ultrasonic welding between the web arranged on the outer profile part and the central section of the inner profile part is ensured when the inner profile part is placed on the outer profile part equipped with the core plate, pressed against the latter while applying the required contact pressure and in the inner profile part ultrasound is introduced to weld the inner profile part of the inner frame with the outer profile part of the outer frame, wherein the core plate can serve as a "stop" when the free end of the web of the outer profile part has been melted to an appropriate extent to weld it permanently and moisture-tight to the central section of the inner profile part. In order to ensure perfect positioning of the two profile parts of the outer and inner frame of the edge protection relative to one another, at least during the ultrasonic welding, and at the same time to largely avoid an uncontrolled introduction of ultrasound into the core plate during the ultrasonic welding of the two profile parts, provision can also expediently be made be that the core plate is fixed, in particular by clamping, at least during the introduction of ultrasound into the inner profile part. This can be done, for example, by means of conventional hold-down devices which clamp the plate against a suitable support.

In the case of an edge protection frame arrangement according to the invention, it can prove to be advantageous in this context if the free end of the web of the outer profile part is essentially parallel to the central section of the inner profile part with which it is able to come into contact during the ultrasonic welding. having extending connecting surface, so that the free end of the web can be welded flat or “butt” to the central portion of the inner profile part.

The inner profile part, which - as already mentioned - can have a very simple structural design, can preferably be provided with a second leg arranged essentially parallel to its first leg, the central section of the inner profile part, for example, being essentially in the same plane can extend like its first leg and its second leg, so that the inner profile part has an approximately rectangular cross-section. Alternatively, it is conceivable, for example, that the central section of the inner profile part connects the first and second legs, which extend in different but essentially parallel planes, to one another, which is, for example, with regard to good stackability of a plurality of panels provided with an edge protection according to the invention, such as on the occasion of their (interim) storage, their transport or the like, can be advantageous.

In a frame arrangement according to the invention, it can accordingly be provided, for example, that the first leg of the inner profile part is arranged essentially parallel to its second leg, wherein the central section of the inner profile part can extend, for example, essentially in the same plane as its first leg and its second Leg, or the central section of the inner profile part, connects, for example, the first and second legs of the inner profile part, which extend in different but essentially parallel planes, to one another.

In order to ensure a particularly flawless and reliable ultrasonic welding of the free end of the web of the outer profile part with the central section of the inner profile part in the vicinity of the ultrasonic excitation of the inner profile part, it can be provided in an advantageous embodiment of the method according to the invention that the ultrasound in the central section of the inner profile part, in particular at its side opposite the free end of the web of the outer profile part. In this way, the ultrasonic waves only have to penetrate the usually small thickness of the central section of the inner profile part in order to weld the latter to the free end of the web arranged on the outer profile part on the side of the central section of the inner profile part opposite the point at which the ultrasound is introduced.

As already mentioned, the method according to the invention in particular also opens up the Particularly advantageous possibility of welding the second leg of the outer profile part at least in some areas to the second leg of the inner profile part in order to ensure a closed frame arrangement of the inner and outer profile part of the edge protection with high rigidity, in which on the one hand the free end of the is approximately parallel to the cut surface of the core plate extending web of the outer profile part with the central portion of the inner profile part, on the other hand, the second leg of the outer profile part are welded to the second leg of the inner profile part. A sequential ultrasonic welding, as it is the prior art according to that described above EP 2 886 011 B1 provides, is not necessary for this, since the second leg of the inner profile part only has to bridge the distance to the second leg of the outer profile part, which is usually chosen to be small solely for reasons of high rigidity of the edge protection and material savings, so that a transmission of the ultrasonic waves is easily ensured by the second leg of the inner profile part up to its junction with the second leg of the outer profile part and the welding of the second legs of the inner and outer profile part to one another can also take place in the vicinity of the ultrasonic excitation of the inner profile part.

In order to ensure a very high stability and rigidity of the edge protection, the second legs of the inner and outer profile part do not necessarily have to be welded together over the entire circumference of the inner or outer profile part, but it is usually sufficient if the second leg of the outer profile part is welded at least partially by introducing ultrasound into the inner profile part simultaneously with the welding of the free end of the web of the outer profile part to the central portion of the inner profile part.

• - das äußere Profilteil mit einer Mehrzahl an Rippen bereitgestellt wird, welche den ersten Schenkel und den zweiten Schenkel des äußeren Profilteils an deren einander zugewandten Seiten miteinander verbinden, wobei die sich im Wesentlichen parallel zur Schnittfläche der Kernplatte erstreckende Länge der Rippen im Wesentlichen der Länge des Steges des äußeren Profilteils entspricht; und
• - die dem zweiten Schenkel des inneren Profilteils zugewandten Seiten der Rippen des äußeren Profilteils mit dem zweiten Schenkel des inneren Profilteils verschweißt werden.

According to a particularly advantageous embodiment of the method according to the invention, it can be provided in this context that

• The outer profile part is provided with a plurality of ribs which connect the first leg and the second leg of the outer profile part to one another on their mutually facing sides, the length of the ribs extending substantially parallel to the cut surface of the core plate being substantially the length of the Corresponds to the web of the outer profile part; and
• - The sides of the ribs of the outer profile part facing the second leg of the inner profile part are welded to the second leg of the inner profile part.

The ribs of the outer profile part, which are distributed in the circumferential direction of the outer profile part and preferably - although not necessarily - essentially equidistantly arranged, initially serve a very high stiffening of the outer profile part in that its first and second legs are connected to one another by a respective rib, so that a practically rigid angle in the range of, for example, about 60 ° to about 120 °, in particular in the range of, for example, about 70 ° to about 110 °, preferably in the range of 90 °, between the first and second legs of the outer profile part. In addition, the ribs of the outer profile part ensure that their height largely corresponds to the length of the web of the outer profile part - essentially parallel to the cut surface of the core plate or essentially in the direction of extension of the second leg of the outer profile part - for a very simple one Their sides facing the second leg of the inner profile part can be welded to the second leg of the inner profile part by ultrasonic excitation of the inner profile part, so that the second leg of the outer profile part can be welded via its ribs to the second leg of the inner profile part in order to ensure the greatest possible rigidity the welded profile parts of the edge protection. The latter happens - as already mentioned - in particular together with the welding of the web of the outer profile part to the central section of the inner profile part.

An advantageous embodiment of the frame arrangement of the edge protection therefore provides that the outer profile part has a plurality of ribs, in particular distributed in the circumferential direction and preferably arranged essentially equidistantly, which the first leg and the second leg of the outer profile part with one another on their mutually facing sides connect, wherein the length of the ribs extending essentially parallel to the cut surface of the core plate corresponds essentially to the length of the web of the outer profile part.

In order to achieve the greatest possible strength and rigidity of the outer profile part while at the same time using very little material, it can also be provided in this context that the ribs of the outer profile part on their sides facing away from the second leg of the outer profile part have a respective section of the web arranged between adjacent ribs of the outer profile part with each other, so that the web is stiffened in sections by adjacent ribs. The web consequently extends between the respective sides of the ribs facing away from the second leg of the outer profile part and in turn stiffens them. Furthermore The ribs of the outer profile part can advantageously each be arranged in a plane of extension which are arranged essentially perpendicular to the plane of extension of the web of the outer profile part and consequently also essentially perpendicular to the plane of extension of the first and second legs of the outer profile part.

• - das äußere Profilteil mit einem zweiten Schenkel bereitgestellt wird, welcher an seiner Innenseite einen sich in Umfangsrichtung des äußeren Profilteils erstreckenden Vorsprung aufweist, welcher im Wesentlichen auf dem Niveau des freien Endes des Steges des äußeren Profilteils vor dessen Verschweißen mit dem zentralen Abschnitt des inneren Profilteils angeordnet ist; und
• - der Vorsprung des ersten Profilteils mit dem zweiten Schenkel des inneren Profilteils verschweißt wird.

Alternatively or in particular in addition to providing the outer profile part with a plurality of ribs of the aforementioned type, it can be provided according to a development of the method according to the invention that

• - The outer profile part is provided with a second leg, which on its inside has a projection extending in the circumferential direction of the outer profile part, which projection is essentially at the level of the free end of the web of the outer profile part before it is welded to the central section of the inner profile part is arranged; and
• - The projection of the first profile part is welded to the second leg of the inner profile part.

Such a projection, which extends in particular essentially around the entire circumference of the first profile part on the inside of its second leg, is able to ensure more or less full circumferential welding of the second leg of the outer profile part to the second leg of the inner profile part, provided this is in addition to the full circumference Welding of the first leg of the second profile part to the web of the first profile part while receiving the core plate between the first leg of the first profile part and the first leg of the second profile part is desired. As already mentioned, the second leg of the inner profile part can also be welded to the second leg of the first profile part via its inside projection, in particular together with the moisture-tight welding of the first leg of the second profile part to the web of the first profile part, in that the inner profile part with Ultrasound is excited because the projection is arranged essentially at the level of the free end of the web of the outer profile part before it is welded to the central portion of the inner profile part.

In a frame arrangement of an edge protection according to the invention, for the reasons mentioned above, it can consequently be provided that the second leg of the outer profile part has on its inside a projection extending in the circumferential direction of the outer profile part, which projection is essentially at the level of the free end of the web of the outer profile part is arranged.

In an advantageous embodiment of the method according to the invention, it can also be provided that the core plate is placed on the outer profile part in such a way that a gap remains between its web and the cut surface of the core plate. The outer dimensions of the core plate should consequently be selected in such a way that they are at least slightly, e.g. up to a few millimeters, smaller than those of the web of the outer profile part of the bounded space. In this way, the core plate is able to expand or contract, especially when it is heated or cooled, so that the plate provided with the edge protection according to the invention is also ensured that it does not warp or bend or even destroy the edge protection in the event of thermal cycling.

In order to ensure perfect tightness of the clamping connection of the core plate between the first legs of the inner and outer profile part, it has also proven to be advantageous if between the first leg of the outer profile part and the core plate and / or between the first leg of the inner profile part and at least one seal is arranged on the core plate, which seal is also able to dampen any vibrations of the ultrasound-excited profile parts during their welding together, so that they are not introduced into the core plate. The frame arrangement according to the invention can be designed for this purpose, for example, such that the first leg of the outer profile part and / or the first leg of the inner profile part has at least one, in particular terminal, protruding projection in the direction of the core plate, which at its the free end of the respective First leg of the outer and / or inner profile part opposite end to receive the seal and prevent it from swelling or flowing out beyond the free end of the respective first leg. In addition, such a projection can provide for a concealment of the respective seal on the visible side, which is particularly desirable for optical reasons. The respective projection can rest on the lower and / or upper side of the core plate, in particular in the completely welded state, the thickness of the seal being at least slightly greater than the height of the respective projection (viewed perpendicular to the plane of extension of the core plate) to be selected in order to achieve a To ensure a perfect sealing function, to ensure sufficient compression of the seal (s) in the welded state of the two profile parts of the edge protection. The seals used here are advantageously elastic, in particular permanently elastic, with Welding of the two profile parts by the respective (first) leg overlapping the core plate are pressed onto the core plate in such a way that a completely gap-free seal results.

• - eine Frequenz des Ultraschalls zwischen etwa 15 kHz und etwa 40 kHz, insbesondere zwischen etwa 20 kHz und etwa 35 kHz;
• - ein Anpressdruck des inneren Profilteils gegen das äußere Profilteil während des Einleitens von Ultraschall zwischen etwa 0,5 bar und etwa 5 bar, insbesondere zwischen etwa 1 bar und etwa 4 bar; und
• - eine Dauer des Einleitens von Ultraschall in das innere Profilteil zwischen etwa 0,1 s und etwa 3 s, insbesondere zwischen etwa 0,15 s und etwa 2,5 s.

Finally, it has proven to be beneficial if at least one, several or, in particular, all of the following process parameters are set in the process according to the invention:

• a frequency of the ultrasound between approximately 15 kHz and approximately 40 kHz, in particular between approximately 20 kHz and approximately 35 kHz;
• a contact pressure of the inner profile part against the outer profile part during the introduction of ultrasound between approximately 0.5 bar and approximately 5 bar, in particular between approximately 1 bar and approximately 4 bar; and
• a duration of the introduction of ultrasound into the inner profile part between approximately 0.1 s and approximately 3 s, in particular between approximately 0.15 s and approximately 2.5 s.

• 1 eine schematische perspektivische Ansicht einer Ausführungsform einer erfindungsgemäßen Platte, mit einer Kernplatte und einem Kantenschutz, welcher ein einen Außenrahmen bildendes äußeres Profilteil sowie ein einen Innenrahmen bildendes inneres Profilteil umfasst, in Explosionsdarstellung vor dem Verschweißen des Außenrahmens mit dem Innenrahmen;
• 2 eine schematische perspektivische Detailansicht des den Außenrahmen des Kantenschutzes bildenden äußeren Profilteils gemäß 1 zur Veranschaulichung dessen Steges und der seinen ersten mit seinem zweiten Schenkel verbindenden Rippen;
• 3 eine schematische Querschnittsansicht der aus der Kernplatte, dem den Außenrahmen bildenden äußeren Profilteil sowie dem den Innenrahmen bildenden inneren Profilteil gebildeten Platte gemäß 1 nach dem Verschweißen des inneren Profilteils mit dem äußeren Profilteil des Kantenschutzes entlang einer Schnittebene zwischen zwei benachbarten Rippen des äußeren Profilteils;
• 4 eine der 3 entsprechende Querschnittsansicht der aus der Kernplatte, dem den Außenrahmen bildenden äußeren Profilteil sowie dem den Innenrahmen bildenden inneren Profilteil gebildeten Platte gemäß 1 nach dem Verschweißen des inneren Profilteils mit dem äußeren Profilteil des Kantenschutzes, aber entlang einer Schnittebene im Bereich einer Rippe des äußeren Profilteils;
• 5 eine vergrößert wiedergegebene Detailansicht der Querschnittsansicht gemäß 3 im Bereich der miteinander verschweißten inneren und äußeren Profilteile des Kantenschutzes einschließlich schematischer Darstellung einer Sonotrode zum Einleiten von Ultraschall in das innere Profilteil anlässlich seines Verschweißens mit dem äußeren Profilteil des Kantenschutzes;
• 6 eine der 5 entsprechende, vergrößert wiedergegebene Detailansicht im Bereich eines mit einer anderen Ausführungsform eines inneren Profilteils verschweißten äußeren Profilteils des Kantenschutzes einschließlich schematischer Darstellung einer Sonotrode zum Einleiten von Ultraschall in das innere Profilteil anlässlich seines Verschweißens mit dem äußeren Profilteil des Kantenschutzes;
• 7 eine der 5 entsprechende, vergrößert wiedergegebene Detailansicht im Bereich eines mit einer anderen Ausführungsform eines äußeren Profilteils, welches einen innenseitig seines zweiten Schenkels angeordneten Vorsprung aufweist, verschweißten inneren Profilteils des Kantenschutzes einschließlich schematischer Darstellung einer Sonotrode zum Einleiten von Ultraschall in das innere Profilteil anlässlich seines Verschweißens mit dem äußeren Profilteil des Kantenschutzes; und
• 8 den Ausschnitt VIII der 7 im Bereich des mit dem zweiten Schenkel des inneren Profilteils verschweißten Vorsprungs des zweiten Schenkels des äußeren Profilteils in vergrößerter Darstellung.

Further features and advantages of the invention emerge from the following description of exemplary embodiments with reference to the drawings. Show:

• 1 a schematic perspective view of an embodiment of a plate according to the invention, with a core plate and an edge protection, which comprises an outer profile part forming an outer frame and an inner profile part forming an inner frame, in an exploded view before the outer frame is welded to the inner frame;
• 2 a schematic perspective detailed view of the outer profile part forming the outer frame of the edge protection according to FIG 1 to illustrate its web and the ribs connecting its first to its second leg;
• 3 a schematic cross-sectional view of the plate formed from the core plate, the outer profile part forming the outer frame and the inner profile part forming the inner frame according to FIG 1 after welding the inner profile part to the outer profile part of the edge protection along a cutting plane between two adjacent ribs of the outer profile part;
• 4th one of the 3 Corresponding cross-sectional view of the plate formed from the core plate, the outer profile part forming the outer frame and the inner profile part forming the inner frame according to FIG 1 after welding the inner profile part to the outer profile part of the edge protection, but along a sectional plane in the region of a rib of the outer profile part;
• 5 an enlarged detailed view of the cross-sectional view according to FIG 3 in the area of the inner and outer profile parts of the edge protection welded together, including a schematic representation of a sonotrode for introducing ultrasound into the inner profile part when it is welded to the outer profile part of the edge protection;
• 6th one of the 5 Corresponding, enlarged detailed view in the area of an outer profile part of the edge protection welded to another embodiment of an inner profile part, including a schematic representation of a sonotrode for introducing ultrasound into the inner profile part when it is welded to the outer profile part of the edge protection;
• 7th one of the 5 Corresponding, enlarged detailed view in the area of an inner profile part of the edge protection welded to another embodiment of an outer profile part, which has a projection arranged on the inside of its second leg, including a schematic representation of a sonotrode for introducing ultrasound into the inner profile part when it is welded to the outer one Profile part of the edge protection; and
• 8th section VIII of the 7th in the area of the projection of the second leg of the outer profile part welded to the second leg of the inner profile part in an enlarged view.

Again 1 As can be seen, a plate, for example in the form of a table top or a cover plate, for example for household appliances of various types, comprises a core plate 1 with a top 1a , a sub-page 1b as well as lateral cut surfaces 1c , with the core plate 1 For example, made of an open-pored and at least on the usage side with a liquid-tight coating (not shown), e.g. melamine resin or the like, provided wood-based material, e.g. pressboard or the like, but for example also from other materials such as glass, plastic, metal, e.g. aluminum etc. can. On the cut surfaces 1c the core plate 1 Overlapping edge protection includes a total of the reference number 100 provided outer frame and a total of the reference number 200 provided inner frame, both of which are made of a plasticizable plastic material, such as polypropylene (PP), polymethyl methacrylate (PMMA), acrylonitrile-butadiene-styrene copolymers (ABS), acrylic ester-styrene-acrylonitrile copolymers (ASA), polystyrene (PS), Polycarbonates (PC), polyamides (PA) or the like, are manufactured and in particular can be in the form of injection molded parts.

As in the 2 ff recognizable is the outer frame 100 of the edge protection from an outer profile part 101 formed, which has an L-profile, the two legs of which, for example, extend essentially in a straight line 102 , 103 in the present embodiment are arranged at an approximately right angle, with between the legs 102 , 103 a radius is arranged by means of which they merge into one another. The first leg 102 of the outer profile part 101 is to reach over the top 1a the core plate 1 formed and in particular arranged approximately parallel to this. The second leg 103 of the outer profile part 101 in the present case extends approximately parallel to the cut surface 1c the core plate 1 from the first leg 102 and is preferably a little longer around the underside 1b the core plate 1 down (in the 1 ff to the top). The outer profile part 101 of the outer frame 100 also has a roughly parallel to the cut surface 1c the core plate 1 - as well as in the case of a substantially right-angled arrangement of the first leg 102 of the first profile part 101 in relation to its second leg 103 also roughly parallel to the second leg 103 of the outer profile part 101 - fully extending web 104 on, which is in the assembled state of the edge protection between the second leg 103 of the outer profile part 101 and the cut surface 1c the core plate 1 , for example essentially straight, extends. It also includes the outer profile part 101 of the outer frame 100 in the exemplary embodiment shown in the drawing, a plurality of ribs distributed around its circumference, for example at least partially essentially equidistantly arranged 105 showing the first leg 102 of the outer profile part 101 with its inner thigh 103 connect (see in particular the 1 , 2 and 4th ) and the outer profile part 101 stiffen in this way. The length of the ribs corresponds to this 105 - approximately parallel to the cut surface 1c the core plate 1 or approximately parallel to the second leg 103 of the outer profile part 101 considered - the length of the web 104 so that the ribs 105 together with the jetty 104 flawlessly with the inner profile part 201 of the inner frame 200 can be ultrasonically welded as described below with reference to the 3 and 4th is explained in more detail. The free (in the drawings, upper) end of the web is for the same purpose 104 of the outer profile part 101 with an approximately parallel to the direction of extension of the core plate 1 or approximately parallel to the first leg 102 of the outer profile part 101 provided extending connecting surface, which for butt ultrasonic welding with the inner profile part 201 able to serve. The same applies to the first leg 102 of the outer profile part 101 remote sides of the ribs 105 which - as mentioned above - are roughly at the same level as the free end of the web 104 extend. In addition, the ribs are 105 advantageously arranged in a respective plane of extension which is approximately perpendicular to the plane of extension of the web 104 of the outer profile part 101 extends, with the ribs 105 on her second leg 103 of the outer profile part 101 facing away sides a respective, between adjacent ribs 105 arranged section of the web 104 of the outer profile part 101 connect with each other, so that a very high strength and rigidity of the outer frame 100 results (see in particular the 2 ).

The inner frame 200 is from an inner profile part 201 formed, which has a central section 202 , one up from the central section 202 , for example, essentially straight, continuously extending, for engaging over the core plate 1 at the bottom 1b trained first leg 203 and one extending in the direction of the central section 202 continue in the opposite direction, for example also essentially straight, extending second leg 204 having. The inner profile part 201 can have a very simple structural design in which its first leg 203 roughly parallel to its second leg 204 and thus approximately parallel to the direction of extension of the core plate 1 is arranged. In the case of the 1 to 5 , 7th and 8th The embodiment variant shown extends the inner profile part 201 here essentially in a single plane in which both the first leg 203 and the second leg 204 as well as the central section connecting them 202 of the inner profile part 201 are arranged so that a substantially web-shaped or strip-shaped configuration of the inner profile part 201 with an approximately rectangular cross-section results. The one in the 6th The embodiment variant shown differs from that according to the 1 to 5 only by the fact that the second leg 204 of the inner profile part is also parallel to its first leg 203 , but on the other hand towards the bottom 1b the core plate 1 is staggered, with the central portion 202 the thigh 203 , 204 of the inner profile part 201 connects with each other. Such a configuration can be advantageous with regard to better stackability of a plurality of panels provided with edge protection, in that the second leg 203 and the adjoining central section 202 of the inner profile part 201 be able to form a better support surface for another plate.

In the 3 and 4th each is a schematic cross-sectional view of that of FIG Core plate 1 the outer frame 100 forming outer profile part 101 as well as the inner frame 200 forming inner profile part 201 formed plate according to 1 after welding the inner profile part 201 with the outer profile part 101 of the edge protection shown schematically, with the 3 a cross-sectional view along a cutting plane between two adjacent ribs 105 of the outer profile part 101 acts while the 4th a cross-sectional view along a cutting plane in the area of one of the ribs 105 of the outer profile part 101 shows. In the 5 FIG. 11 is the cross-sectional view of FIG 3 again in the area of the inner 201 and outer profile parts welded to one another 101 of the edge protection shown enlarged, with an additional sonotrode S. The dashed lines indicate how they are used to introduce ultrasound into the inner profile part 201 on the occasion of its ultrasonic welding with the outer profile part 101 of the edge protection is used. The same applies to the representation of the 6th , which - as described above - differs from the 5 only due to the different design variant of the inner profile part 101 differs. To better illustrate the situation before the ultrasonic welding of the inner profile part 201 with the outer profile part 101 are the original dimensions of the bridge 104 and the ribs 105 of the outer profile part 101 , so before they start with the inner profile part 201 have been welded or fused, in the form of in the inner profile part 201 "Protruding" lines indicated, so that the welding dimension M. it can be seen by which the respective components have been "melted" during the ultrasonic welding.

As from the 3 to 6th can be seen, take the first leg in the fully assembled state of the edge protection 102 of the outer profile part 101 and the first leg extending approximately parallel to this 203 of the inner profile part 201 the edge area of the core plate 1 between them, being the bridge 104 of the outer profile part 101 substantially perpendicular to the first leg 102 of the outer profile part 101 which is the top 1a the core plate 1 overlaps, as well as to the first leg 203 of the inner profile part 201 which the bottom 1b the core plate 1 overlaps, and approximately parallel to the cut surface 1c the core plate 1 extends so that an approximately U-shaped receptacle for the edge region of the core plate 1 is formed. The latter is designed to be moisture-proof due to the fact that the inner profile part 201 facing, free end of the web 104 with the central section 202 of the inner profile part 201 is welded or fused, which - as explained in detail below - happens by means of ultrasonic welding. The core plate 1 is dimensioned such that between their cut surfaces 1c and the jetty 104 of the outer profile part 101 A gap 2 remains to the core plate 1 especially heat-related dimensional changes relative to the interior 200 or the outer frame welded to it 100 to enable. To ensure the greatest possible tightness of the first leg 102 of the outer profile part 101 , its bridge 104 and the central section welded to it 202 of the inner profile part 201 on which its first leg 203 adjoins, formed edge-side recording of the core plate 1 In the exemplary embodiment shown in the drawing, this includes both the first leg 102 of the outer profile part 101 as well as the first leg 203 of the inner profile part 201 a terminal one in the direction of the core plate 1 protruding and consequently facing projection 107 , 207 , which in the fully assembled or welded state of the plate, for example on the top 1a or on the bottom 1b the core plate 1 comes to rest and on the inside of the same one seal each 108 , 208 which accommodates the core plate 1 against that of the outer 101 and inner profile part 201 formed edge protection seals (see in particular the detailed views of 5 and 6th ). The thickness of the seals 108 , 208 is preferably slightly greater than the height of the respective projection 107 , 207 in order to compress the elastic sealing material sufficiently to fulfill its sealing function.

How continue the 3 to 6th can be seen, is also the second leg 204 of the inner profile part 201 with the second leg 103 of the outer profile part 101 welded, which - as explained in detail below - also happens by means of ultrasonic welding. In the 3 to 6th Exemplary embodiments shown in the drawing is the second leg 204 of the inner profile part 201 in some areas with the second leg 103 of the outer profile part 101 welded, via the ribs arranged on the latter 105 whose the second leg 204 of the inner profile part 201 facing side together with the bridge 104 of the outer profile part 101 with the second leg 204 of the inner profile part 201 are welded or fused, whereby not only the outer profile part 101 of the outer frame 100 , but the entire frame arrangement of the edge protection with an outer profile part of the outer frame 100 as well as on the inner profile part welded to it 201 of the inner frame 200 very high strength and rigidity are imparted.

The ones in the 7th and 8th The embodiment variant reproduced in the form of detailed views, in which identical or functionally equivalent components are provided with the same reference numerals and do not require a repeated description, differs from that according to FIGS 3 to 5 only by the fact that the second leg 204 of inner profile part 201 not only in areas on a respective rib 104 of the outer profile part 101 with the second leg 103 of the outer profile part 101 is welded, but - to the extent that it corresponds to the welded connection between the free end of the web 104 of the outer profile part 101 and the central section 202 of the inner profile part 201 - essentially in full. For this purpose it has an outer profile part 101 on the inner profile part 201 facing inside of his second leg 103 with a protrusion extending in the circumferential direction 106 provided (see the enlarged illustration of 8th ), which, for example, has a thickness D of about one or a few millimeters. During the lead 106 of the outer profile part 101 in the in the 7th and 8th reproduced situation already with the second leg 204 of the inner profile part 201 is welded or fused, it extends before the ultrasonic welding process essentially at the same level as the free end of the web 104 or like that of the first leg 102 of the outer profile part 101 opposite sides of the ribs 105 so that the second leg 204 of the inner profile part 201 when the inner frame 200 according to the 1 on the one with the core plate 1 equipped outer frame 100 is placed with its free end - or more precisely: with the first leg 102 of the outer profile part 101 facing end portion - on the ledge 106 comes to rest, while his second leg 204 at the same time with the side of the ribs facing this 105 and its central section 202 at the same time with the free end of the web 104 comes into contact in order to enable a common ultrasonic welding of the aforementioned components to one another to form the edge protection.

The following is an embodiment of a method according to the invention for producing that with an edge protection described above, which the outer frame 100 in the form of the outer profile part 101 as well as the inner frame 200 in the form of the inner profile part 201 includes, provided plate by ultrasonic welding of the two profile parts 101 , 201 including the core plate 1 explained in more detail.

• - das freie Ende des Steges 104 des äußeren Profilteils 101 mit dem zentralen Abschnitt 202 des inneren Profilteils 201,
• - die dem zweiten Schenkel 204 des inneren Profilteils 201 zugewandten Seiten der Rippen 105 des äußeren Profilteils 101 mit dem zweiten Schenkel 204 des inneren Profilteils 201, sowie gegebenenfalls
• - der Vorsprung 106 des ersten Profilteils 101 mit dem zweiten Schenkel 204 des inneren Profilteils 201 in Anlage aneinander gelangen.

As especially in the 1 First the core plate becomes recognizable 1 which previously - for example by spraying on a still liquid-viscous resin mixture that hardens to form a permanently elastic polymer material - with the two seals 108 , 208 has been provided, in the overhead arranged outer profile part 101 of the outer frame 100 inserted by the core plate 1 for example, by engaging the web on the inner circumference 104 of the outer profile part 101 is placed on a clamping table (not shown) of an ultrasonic welding device (not shown in the drawing) and is fixed there by clamping. Then the inner profile part 201 of the inner frame 200 on the one with the core plate 1 provided outer profile part 201 of the outer frame 100 hung up. The cross section of the core plate 1 is dimensioned in such a way that between it and the web surrounding it 104 of the outer profile part 101 the gap 2 remains (see the 5 to 7th ). Furthermore, the thickness of the core plate 1 dimensioned such that they are at least slightly smaller than the ones parallel to the cut surface 1c the core plate 1 extending length of the web 104 and consequently is smaller by a corresponding amount than that which is parallel to the cut surface 1c the core plate 1 extending length of the ribs 105 of the outer profile part 101 (see the 3 to 6th taking into account the welding dimension M. ). Unless the outer profile part 101 with the inside of his second leg 103 arranged projection 106 is provided, the same applies with regard to its height level (cf. 7th and 8th , again taking into account the welding dimension M. ). The inner profile part 201 is now consequently under the interposition of the core plate 1 on the outer profile part 101 On that

• - the free end of the bridge 104 of the outer profile part 101 with the central section 202 of the inner profile part 201 ,
• - that of the second leg 204 of the inner profile part 201 facing sides of the ribs 105 of the outer profile part 101 with the second leg 204 of the inner profile part 201 , as well as, if applicable
• - the lead 106 of the first profile part 101 with the second leg 204 of the inner profile part 201 come together in plant.

While for lateral fixation of the outer profile part 101 of the outer frame 100 opposite the inner profile part 201 of the inner frame 200 the profile parts 101 , 201 now parallel to the direction of extension of the core plate 1 can be held in position relative to each other (not shown), the outer profile part 101 and the inner profile part 201 now with a contact pressure suitable for the subsequent ultrasonic welding process of, for example, about 1 bar to about 4 bar perpendicular to the direction of extension of the core plate 1 pressed against each other, either by means of sonotrodes used for ultrasonic excitation S. and / or by means of additional pressure means (not shown). As in particular in the 5 to 7th recognizable, is now in the inner profile part 201 Ultrasound, for example with a frequency between about 15 kHz and about 40 kHz over a period of time between about 0.1 s and about 3 s, is initiated, which in the present case is carried out by means of one or in particular more sonotrode (s) S. happens, which with the the free end of the web 104 of the outer profile part 101 facing away from the inner profile part 201 be brought into contact. Using the sonotrode S. The ultrasound can preferably be used in the area of the free end of the web 104 of the outer profile part 101 opposite side of the central section 202 of the inner profile part 201 are introduced into the latter, so that at least the contact area to be welded to one another of the web 104 with the central section 202 of the inner profile part is located in the immediate near field of the ultrasound, the contact area to be welded to one another also being of the second leg 204 of the inner profile part 201 facing sides of the ribs 105 of the outer profile part 101 with the second leg 204 of the inner profile part 201 and optionally the contact area of the projection that is to be welded to one another 106 with the second leg 204 of the inner profile part 201 are in the near field of the ultrasound.

In this way, the aforementioned contact areas of the profile parts 101 , 201 as a result of their ultrasound excitation and the resulting plasticization in areas on the contact areas pressed against one another, they are now ultrasonically welded to one another at the same time until the in the 3 to 6th or. 7th and 8th The situation shown results in which the frame profiles 101 , 201 have been completely welded or fused together, the inner profile part 201 around the sweat measure M. closer to the outer profile part 101 is moved up so that the core plate 1 now close between their first legs 102 , 203 and the jetty 104 of the outer profile part 101 is recorded. The latter happens as a result of the pressure on the inner profile part 201 against the outer profile part 101 by means of the sonotrode (s) S. as well as due to the increasing melting of the polymer material at the contact areas of the inner profile part which are in contact with one another 201 and the outer profile part 101 except for the sweat M. .

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 4204161 A1 [0007]
• DE 4406118 A1 [0007]
• EP 2886001 B1 [0010, 0012]
• EP 2886011 B1 [0014, 0025]

Claims (18)

A method for producing a plate provided with edge protection, in particular in the form of a table or cover plate, comprising - a core plate (1) with an upper side (1a), an underside (1b) and lateral cut surfaces (1c); - An outer frame (100) of the edge protection forming outer profile part (101) made of plasticizable plastic material, wherein the outer profile part (101) is an L-profile with a top (1a) of the core plate (1) overlapping first leg (102) and with has a second leg (103) extending essentially parallel to the cut surface (1c) of the core plate (1); and - an inner profile part (201) made of plasticizable plastic material and forming an inner frame (200) of the edge protection, the inner profile part (201) having a central section (202), a core plate (1 ) has on its underside (1b) overlapping first leg (203) and a second leg (204) extending away from the central section (202) in the opposite direction; - wherein the first leg (102) of the outer profile part (101) and the first leg (203) of the inner profile part (201) accommodate the edge region of the core plate (1) between them and the outer profile part (101) of the outer frame (100) the inner profile part (201) of the inner frame (200) is welded by inserting the core plate (1) into the outer profile part (101), placing the inner profile part (201) on the core plate (1) and the outer profile part (101) and Ultrasound is introduced into the inner profile part (201) in order to weld the inner profile part (201) of the inner frame (201) to the outer profile part (101) of the outer frame (100), characterized by the following steps: - providing an outer profile part ( 101), which has a substantially parallel to the cut surface (1c) of the core plate (1) or to the second leg (103) of the outer profile part (101) and between the second leg (103) of the outer profile part (101) and the Has the cut surface (1c) of the core plate (1) arranged web (104); - Inserting the core plate (1) into the outer profile part (101) and placing the inner profile part (201) on the core plate (1) and the outer profile part (101) until the free end of the web (104) of the outer profile part (101 ) comes into contact with the central portion (202) of the inner profile part (201); - Introducing ultrasound into the inner profile part (101) at its side facing away from the free end of the web (104) of the outer profile part (201) and pressing the inner profile part (201) against the outer profile part (201) essentially perpendicular to the direction of extension the core plate (1), the free end of the web (104) of the outer profile part (201) being welded to the central section of the inner profile part (101). Procedure according to Claim 1 , characterized in that the thickness of the core plate (1) is selected such that it is at least slightly smaller than the length of the web (104) of the outer profile part (101) extending essentially parallel to the cut surface (1c) of the core plate (1) ) before it is welded to the central section (202) of the inner profile part (201). Procedure according to Claim 1 or 2 , characterized in that the inner profile part (201) is provided with a second leg (204) arranged essentially parallel to its first leg (203), the central section (202) of the inner profile part (201) essentially extending extends in the same plane as its first leg (203) and its second leg (204); or the first (203) and second legs (204) extending in different but essentially parallel planes are connected to one another. Method according to one of the Claims 1 to 3 , characterized in that the ultrasound is introduced into the central section (202) of the inner profile part (201), in particular at its side opposite the free end of the web (104) of the outer profile part (101). Method according to one of the Claims 1 to 4th , characterized in that furthermore the second leg (103) of the outer profile part (101) is welded at least in certain areas to the second leg (204) of the inner profile part (201). Procedure according to Claim 5 , characterized in that the second leg (103) of the outer profile part (101) by introducing ultrasound into the inner profile part (201) simultaneously with the welding of the free end of the web (104) of the outer profile part (201) to the central section of the inner profile part (101) is at least partially welded. Procedure according to Claim 5 or 6th , characterized in that - the outer profile part (101) is provided with a plurality of ribs (105) which are arranged essentially equidistantly in particular in the circumferential direction and which support the first leg (102) and the second leg (103) of the outer profile part ( 101) connect to one another on their mutually facing sides, the length of the ribs (105) extending essentially parallel to the cut surface (1c) of the core plate (1) corresponding essentially to the length of the web (104) of the outer profile part (101); and - the sides of the ribs (105) of the outer profile part (101) facing the second leg (204) of the inner profile part (201) are welded to the second leg (204) of the inner profile part (201). Method according to one of the Claims 5 to 7th , characterized in that - the outer profile part (101) is provided with a second leg (103) which on its inside has a projection (106) extending in the circumferential direction of the outer profile part (101), which projection (106) is substantially at the level of the the free end of the web (104) of the outer profile part (101) is arranged before it is welded to the central section (202) of the inner profile part (201); and - the projection (106) of the first profile part (101) is welded to the second leg (204) of the inner profile part (202). Method according to one of the Claims 1 to 8th , characterized in that the core plate (1) is placed on the outer profile part (101) in such a way that a gap (2) remains between its web (104) and the cut surface (1c) of the core plate (1). Method according to one of the Claims 1 to 9 , characterized in that between the first leg (102) of the outer profile part (101) and the core plate (1) and / or between the first leg (203) of the inner profile part (201) and the core plate (1) at least one seal ( 108, 208) is arranged. Method according to one of the Claims 1 to 10 , characterized in that at least one of the following process parameters is set: a frequency of the ultrasound between 15 kHz and 40 kHz, in particular between 20 kHz and 35 kHz; - A contact pressure of the inner profile part (201) against the outer profile part (101) during the introduction of ultrasound between 0.5 bar and 5 bar, in particular between 1 bar and 4 bar; and - a duration of the introduction of ultrasound into the inner profile part (201) between 0.1 s and 3 s, in particular between 0.15 s and 2.5 s. Frame arrangement for producing an edge protection of a core plate (1) according to a method according to one of the Claims 1 to 11 , comprising - an outer frame (100) of the edge protection forming outer profile part (101) made of plasticizable plastic material, wherein the outer profile part (101) has an L-profile, the first leg (102) of which to overlap the top (1a) of the core plate ( 1) and the second leg (103) of which is designed to be arranged essentially parallel to the cut surface (1c) of the core plate (1); and - an inner profile part (201) made of plasticizable plastic material and forming an inner frame (200) of the edge protection, the inner profile part (201) having a central section (202), a first leg (203) extending away from the central section (202) which is designed to overlap the underside (1b) of the core plate (1) and has a second leg (204) extending away from the central section (202) in the opposite direction; - The first leg (102) of the outer profile part (101) and the first leg (203) of the inner profile part (201) for receiving the edge region of the core plate (1) are formed between them and the inner profile part (201) with the outer one Profile part (101) can be welded when the core plate (1) is inserted into the outer profile part (101) and the inner profile part (201) has been placed on the core plate (1) and the outer profile part (101), characterized in that the outer profile part (101) extending essentially parallel to the cut surface of the core plate (1) or to the second leg (103) of the outer profile part (101) and between the second leg (103) of the outer profile part (101) and the Has cut surface (1c) of the core plate (1) arranged web (104) when the core plate (1) has been inserted into the outer profile part (101), the extending substantially parallel to the cut surface (1c) of the core plate (1) Long e of the web (104) of the outer profile part (101) is selected such that it comes into contact with the central section (202) of the inner profile part (201) when the inner profile part (201) hits the core plate (1) and the outer profile part (101) has been placed. Frame arrangement according to Claim 12 , characterized in that the free end of the web (104) of the outer profile part (101) has a connecting surface extending essentially parallel to the central section (202) of the inner profile part (201) with which it is able to come into contact . Frame arrangement according to Claim 12 or 13th , characterized in that the first leg (203) of the inner profile part (201) is arranged essentially parallel to its second leg (204), the central section (202) of the inner profile part (201) - being essentially in the same plane extends like its first leg (203) and its second leg (204); or the first (203) and second legs (204) extending in different but essentially parallel planes are connected to one another. Frame arrangement according to one of the Claims 12 to 14th , characterized in that the outer profile part (101) has a plurality of ribs (105), in particular ribs (105) which are arranged essentially equidistantly in the circumferential direction and which attach to the first leg (102) and the second leg (103) of the outer profile part (101) connect their mutually facing sides with one another, the length of the ribs (105) extending essentially parallel to the cut surface (1c) of the core plate (1) corresponding essentially to the length of the web (104) of the outer profile part (101). Frame arrangement according to Claim 15 , characterized in that the ribs (105) of the outer profile part (101) - on their sides facing away from the second leg (103) of the outer profile part (101) a respective section of the web (104) arranged between adjacent ribs (105) of the connect the outer profile part (101) to one another; and / or - are each arranged in a plane of extension which are arranged essentially perpendicular to the plane of extension of the web (104) of the outer profile part (101). Frame arrangement according to one of the Claims 12 to 16 , characterized in that the second leg (103) of the outer profile part (101) has on its inside a projection (106) which extends in the circumferential direction of the outer profile part (101) and which is essentially at the level of the free end of the web (104 ) of the outer profile part (101) is arranged. Plate, in particular in the form of a table top or cover plate, with an edge protection which has a frame arrangement according to one of the Claims 12 to 17th has, in which the core plate (1) between the first leg (102) of the outer profile part (101) and the first leg (203) of the inner profile part (201) is received, characterized in that at least the central portion (202) of the inner profile part (201) is welded to the free end of the web (104) of the outer profile part (101).

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