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DE10234509A1 - Transverse welding or welding and cutting machine for plastic films used in bag and sack production has a plastic band between two welding tools - Google Patents

Transverse welding or welding and cutting machine for plastic films used in bag and sack production has a plastic band between two welding tools Download PDF

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Publication number
DE10234509A1
DE10234509A1 DE10234509A DE10234509A DE10234509A1 DE 10234509 A1 DE10234509 A1 DE 10234509A1 DE 10234509 A DE10234509 A DE 10234509A DE 10234509 A DE10234509 A DE 10234509A DE 10234509 A1 DE10234509 A1 DE 10234509A1
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DE
Germany
Prior art keywords
welding
plastic
bar
welding bar
films
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE10234509A
Other languages
German (de)
Inventor
Heiko Knoll
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lemo Maschinenbau GmbH
Original Assignee
Lemo Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lemo Maschinenbau GmbH filed Critical Lemo Maschinenbau GmbH
Priority to DE10234509A priority Critical patent/DE10234509A1/en
Publication of DE10234509A1 publication Critical patent/DE10234509A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
    • B31B50/60—Uniting opposed surfaces or edges; Taping
    • B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/004—Preventing sticking together, e.g. of some areas of the parts to be joined
    • B29C66/0042—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined
    • B29C66/0044—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool
    • B29C66/00441—Preventing sticking together, e.g. of some areas of the parts to be joined of the joining tool and the parts to be joined using a separating sheet, e.g. fixed on the joining tool movable, e.g. mounted on reels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81411—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
    • B29C66/81415—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
    • B29C66/81419—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8225—Crank mechanisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8351—Jaws mounted on rollers, cylinders, drums, bands, belts or chains; Flying jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/26—Devices specially adapted for producing transverse or longitudinal seams in webs or tubes
    • B65B51/30—Devices, e.g. jaws, for applying pressure and heat, e.g. for subdividing filled tubes
    • B65B51/306—Counter-rotating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B65/00—Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details
    • B65B65/06—Details peculiar to packaging machines and not otherwise provided for; Arrangements of such details coated or treated with anti-friction or anti-sticking materials, e.g. polytetrafluoroethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8122—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the composition of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

A plastic strip(2) is positioned between a welding tool(3) and the plastic films passing under the latter. Connection between the moving welding tool and its drive system(6) has no dampers or springs. Films may be welded between two opposing welding tools(3,4) which during machine set up have tool faces almost in contact with each other when there are no plastic strips(7,8) or films(2) between them. Similar set up conditions exist when only one welding tool is used in conjunction with a fixed opposing support. In both cases the speed of the welding tool when meeting and compressing the plastic strip is almost zero. Welding time is determined by the stationary period of the tool drive system(6). The plastic strip is 0.3mm thick and acts as a damper during the welding stage.

Description

Die Erfindung betrifft eine Vorrichtung zum Querschweißen oder Quertrennschweißen von Kunststoffolien für eine Maschine zur Herstellung von Beuteln, Säcken oder dergleichen, mit mindestens einem hin- und herbeweglichen Schweißbalken, unter dem die Kunststoffolien zum Verschweißen hindurchgeführt werden.The invention relates to a device for transverse welding or cross-cut welding of plastic foils for a machine for the production of bags, sacks or the like, with at least one reciprocating welding bar under which the plastic sheets for welding passed become.

Erfolgt eine Schweißnaht quer zur Laufrichtung der Kunststoffolien, so spricht man von Querschweißen. Ist mit dem Querschweißen auch gleichzeitig ein Abtrennen eines Beutels oder einer Tasche verbunden, so handelt es sich bei diesem Schweißvorgang um ein Quertrennschweißen.If a weld is made across To the direction of plastic films, it is called transverse welding. is with the transverse welding at the same time a separation of a bag or bag connected, Thus, this welding process is a cross-cutting welding.

Aus der DE 39 31 967 A1 ist eine Vorrichtung zur Steuerung von Maschinen zur Herstellung von Schlauch- oder Halbschlauchbahnen bekannt. Zum gegenläufigen Antrieb der Schweißbalken ist ein Schrittmotor vorgesehen, der durch übliche Getriebeglieder als Kurbeltrieb mit den Schweißbalken verbunden ist. Zum Schweißen werden die Schweißbalken gegen eine feste Unterlage gepreßt. Diese Pressung erfolgt einerseits aus dem Eigengewicht der Schweißbalken und wird zusätzlich durch eine Federkraft erhöht. Diese Feder hat einerseits die Aufgabe, den Schweißbalken während der Schweißung auf die Unterlage zu pressen und bewirkt andererseits, daß die Schweißbalken über eine gewisse Zeit, während der sich der Kurbeltrieb weiterbewegt, auf der Unterlage verbleibt. Bei derartigen Antrieben wird die Schweißbalken mit hoher Geschwindigkeit gegen die Unterlage verfahren, so daß ein großer Impuls auf die Unterlage wirkt.From the DE 39 31 967 A1 a device for controlling machines for the production of tubular or semi-tubular webs is known. For the opposite drive of the welding bars, a stepping motor is provided, which is connected by conventional gear members as a crank mechanism with the welding bar. For welding, the welding bars are pressed against a firm base. This pressure takes place on the one hand from the weight of the welding bar and is additionally increased by a spring force. On the one hand, this spring has the task of pressing the sealing bar onto the base during welding and, on the other hand, of causing the sealing bars to remain on the base for a certain time during which the crank mechanism continues to move. In such drives, the welding bar is moved at high speed against the pad, so that a large pulse acts on the pad.

Eine weitere Vorrichtung zum Verschweißen von Kunststoffolienbahnen ist aus der EP 0 297 636 A2 bekannt. Der Antrieb des Schweißbalkens erfolgt hierbei über ein Gestänge, in das ein Federelement integriert ist. Das Federelement dient dabei ebenfalls zur Einstellung des Drucks auf den Schweißbalken. In der beschriebenen Vorrichtung werden mittels des Gestänges zwei Schweißbalken gegeneinander bewegt, wobei lediglich in den Antrieb für das obere Gestänge ein Federelement integriert ist. Da aber beide Schweißbalken angetrieben sind, treffen die Schweißbalken in der Schweißposition mit hoher Geschwindigkeit aufeinander, so daß ein starker Impuls erzeugt wird. Dieser Impuls wirkt einerseits auf den Antrieb, aber auch auf das Maschinengestell, so daß es zu Schwingungen in der Maschine kommen kann. Durch die hohen Taktraten beim Schweißen kann die Maschine in Schwingungen geraten, was einerseits zu Ungenauigkeiten und Fehlern bei der Schweißung führen kann und andererseits Lärm verursacht.Another device for welding plastic film webs is from EP 0 297 636 A2 known. The drive of the welding beam takes place via a linkage, in which a spring element is integrated. The spring element also serves to adjust the pressure on the welding bar. In the described device two welding bars are moved against each other by means of the linkage, wherein only in the drive for the upper linkage, a spring element is integrated. But since both welding bars are driven, the welding bars hit each other in the welding position at high speed, so that a strong pulse is generated. This pulse acts on the one hand on the drive, but also on the machine frame, so that it can cause vibrations in the machine. Due to the high clock rates during welding, the machine can vibrate, which on the one hand can lead to inaccuracies and errors in the weld and on the other hand causes noise.

Der hohe Impuls, die Verweildauer und die hohen Temperaturen bewirken unter anderem, daß es beim Schweißen der Kunststoffolien zum Verkleben des Kunststoffes mit dem Schweißbalken kommen kann und dadurch der verschweißte Beutel und/oder die Kunststoffolien am Schweißbalken hängenbleiben. Um das Anhaften der Kunststoffolienbahnen an der Schweißwalze zu verhindern, ist aus der deutschen Patentanmeldung DE 101 51 576 bekannt, die Schweißwalze von einem umlaufenden Kunststoffband, insbesondere einem Teflonband, abzudecken.Among other things, the high momentum, the residence time and the high temperatures cause the welding of the plastic films to cause the plastic to stick to the welding bar and thus cause the welded bag and / or the plastic films to get caught on the welding bar. In order to prevent the adhesion of the plastic film webs to the welding roller is known from the German patent application DE 101 51 576 known to cover the welding roller by a circumferential plastic belt, in particular a Teflon tape.

Aufgabe der Erfindung ist es, den Aufbau der Maschine zu vereinfachen und Eigenschwingungen der Maschine zu reduzieren.The object of the invention is the, To simplify the construction of the machine and the natural vibrations of the machine to reduce.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß zwischen dem Schweißbalken und der Kunststoffolie ein Kunststoffolienband angeordnet ist und eine inelastische Verbindung zwischen dem Schweißbalken und dem Antrieb für den Schweißbalken besteht.This object is achieved according to the invention solved, that between the welding bar and the plastic film, a plastic ribbon is arranged and an inelastic connection between the welding bar and the drive for the welding bar consists.

Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous embodiments of Invention will become apparent from the dependent claims.

Erfindungsgemäß ist der Schweißbalken mit dem Antrieb inelastisch verbunden, dass heißt es sind keine elastischen Elemente wie Dämpfer oder Federn vorhanden. Der Antrieb ist somit mittelbar, beispielsweise über ein Gestänge, aber starr mit dem Schweißbalken verbunden. Besitzt die Vorrichtung lediglich einen beweglichen Schweißbalken und ein festes Gegenlager, dann fährt der Schweißbalken aus seiner oberen Position auf das Gegenlager zum Schweißen herunter. Dabei wird der Schweißbalken erfindungsgemäß direkt angetrieben. Der Schweißbalken ist mechanisch so eingestellt, daß zwischen dem Gegenlager und dem Schweißbalken in seiner tiefsten Position, dem sogenannten Totpunkt, der Abstand Null eingestellt wird. Der Schweißbalken verfährt somit bis auf das Gegenlager, ohne einen oder nur einen sehr geringen Impuls auf das Gegenlager auszuüben. Das meehanische Einstellen des Abstands zwischen dem Schweißbalken und dem Gegenlager auf den Abstand Null erfolgt, ohne daß sich ein Kunststoffband oder eine Kunststoffolienbahn in der Vorrichtung befinden.According to the invention, the welding bar Inelastically connected to the drive, that is, there are no elastic Elements like dampers or feathers present. The drive is thus indirectly, for example via a linkage, but rigid with the welding bar connected. The device has only a movable welding bar and a fixed counter bearing, then the welding beam goes out down to its upper position on the anvil for welding. In this case, the welding bar according to the invention directly driven. The welding bar is mechanically adjusted so that between the abutment and the welding bar in its lowest position, the so-called dead center, the distance Zero is set. The welding bar thus moves except for the counter bearing, without or only a very small one Impulse to exert the counter bearing. The meehanic adjustment of the distance between the welding bar and the counter bearing to the distance zero, without a Plastic tape or a plastic film web in the device are located.

Die Dicke der Kunststoffolien beträgt zwischen ca. 10 und 100 μm. Die Dicke des Kunststoffbands beträgt ca. 270 μm. Hieraus ergibt sich eine minimale Dicke von 280 μm je Schweißlage. Diese Dicke ergibt sich wenn mit einem Schweißbalken, einem festen Gegenlager und mit minimalsten Foliendicken gearbeitet wird.The thickness of the plastic films is between about 10 and 100 microns. The thickness of the plastic tape is about 270 microns. This results in a minimum Thickness of 280 μm each welding position. This thickness results when using a welding bar, a fixed counter bearing and work with minimal film thicknesses.

Wird mit zwei gegeneinander bewegbaren Schweißbalken und mit zwei Kunststoffbändern gearbeitet und liegt eine Dicke der Folien von 100 μm vor, so ergibt sich eine Schichtdicke von etwa 0,5 mm. Gegen diese Schicht fahren die Schweißbalken zusammen und dämpfen die Verfahrbewegung der Schweißbalken.Comes with two mutually movable welding bars and with two plastic bands worked and there is a thickness of the films of 100 microns, so results in a layer thickness of about 0.5 mm. Against this layer drive the welding bars together and steam the movement of the welding bars.

Nachfolgend soll die Erfindung anhand von Zeichnungen näher erläutert werden. Es zeigen:The invention is based on from drawings closer explained become. Show it:

1 den prinzipiellen Aufbau einer Vorrichtung zum Querschweißen oder Quertrennschweißen von Kunststoffolien. 1 the basic structure of a device for transverse welding or cross-cutting welding of plastic films.

2 den prinzipiellen Aufbau einer Vorrichtung zum Querschweißen oder Quertrennschweißen von Kunststoffolien während des Einrichtens der Maschine 2 the basic structure of a device for transverse welding or cross-cutting welding of plastic films during the setup of the machine

In der 1 ist eine bevorzugte Ausführungsform einer Vorrichtung 1 zum Querschweißen von Kunststoffolien 2 für eine Maschine zur Herstellung von Beuteln, Säcken oder dergleichen dargestellt. Dabei besteht die Vorrichtung 1 aus zwei Schweißbalken 3, 4, die über ein Gestänge 5 direkt mit dem Antrieb 6 verbunden sind und zwei Kunststoffbändern 7, 8, die vorzugsweise aus PTFE (Teflon) bestehen und jeweils zwischen dem Schweißbalken 3, 4 und der Folienbahn 2 verlaufen.In the 1 is a preferred embodiment of a device 1 for transverse welding of plastic films 2 for a machine for the production of bags, sacks or the like. There is the device 1 from two welding bars 3 . 4 that have a linkage 5 directly with the drive 6 are connected and two plastic bands 7 . 8th , which are preferably made of PTFE (Teflon) and in each case between the welding bar 3 . 4 and the film web 2 run.

Der Antrieb 6, der zum Beispiel ein Servomotor sein kann, ist lediglich für den oberen Schweißbalken dargestellt. Das Gestänge 5 ist exzentrisch an den Antrieb 6 angeschlossen, so daß aus der Drehbewegung eine Hin- und Herbewegung für den Schweißbalken 3, 4 wird. Dabei ist das Gestänge 5 erfindungsgemäß direkt und ohne federnde Elemente zwischen dem Antrieb 6 und dem Schweißbalken 3, 4 angeordnet.The drive 6 which may be a servomotor, for example, is shown only for the upper welding bar. The linkage 5 is eccentric to the drive 6 connected, so that from the rotational movement, a reciprocating motion for the welding bar 3 . 4 becomes. Here is the linkage 5 according to the invention directly and without resilient elements between the drive 6 and the welding bar 3 . 4 arranged.

Die 1 zeigt den Aufbau einer Vorrichtung 1 mit zwei gegeneinander bewegbaren Schweißbalken 3, 4. Zum Verschweißen der Kunststoffolien 2 verfahren die Schweißbalken 3, 4 gegen die Kunststoffbänder 7, 8 und klemmen die Kunststoffolienbahn zwischen sich ein. Die Kunststoffolienbahn 2 wird dabei verpreßt. Hierbei wird der benötigte Druck für die Schweißung erzeugt. Die Schweißbalken 3, 4 werden während der Produktion kontinuierlich beheizt, so daß lediglich die Zeit zum Verschweißen eingestellt werden muß. Die Zeit wird dabei über den elektrischen Antrieb 6 gesteuert. Nach ausreichender Schweißzeit wird der Schweißbalken 3, 4 wieder angehoben und in die Ausgangsposition zurück verfahren.The 1 shows the structure of a device 1 with two mutually movable welding bars 3 . 4 , For welding the plastic films 2 move the welding bars 3 . 4 against the plastic bands 7 . 8th and clamp the plastic film web between them. The plastic film web 2 will be pressed. Here, the required pressure for the weld is generated. The welding bars 3 . 4 are continuously heated during production, so that only the time must be set for welding. The time will be over the electric drive 6 controlled. After sufficient welding time, the welding bar becomes 3 . 4 raised again and moved back to the starting position.

Zum Einstellen zwei gegeneinander bewegbarer Schweißbalken 3, 4 wird das Teflonband 7, 8 und die Kunststoffolienbahn 2 aus der Vorrichtung 1 entfernt, wie in 2 dargestellt und die Schweißbalken 3, 4 gegeneinander verfahren. Beim Zusammenfahren werden die gegeneinander angeordneten Schweißbalken 3, 4, ohne Kunststoffband 7, 8 und Kunststoffolien 2, auf einen Abstand von nahezu Null eingestellt.For adjusting two mutually movable welding bars 3 . 4 becomes the teflon tape 7 . 8th and the plastic film web 2 from the device 1 removed, as in 2 represented and the welding bars 3 . 4 proceed against each other. When moving together, the opposing welding bars 3 . 4 , without plastic strap 7 . 8th and plastic films 2 , set at a distance of almost zero.

Zum Einstellen eines Schweißbalken 3, 4 und eines Gegenlagers wird ebenfalls das Teflonband 7, 8 und die Kunststoffolienbahn 2 aus der Vorrichtung 1 entfernt und der Schweißbalken gegen das Gegenlager verfahren. Beim Zusammenfahren wird dann ein Abstand, ohne Kunststoffband und Kunststoffolien 2, von nahezu Null eingestellt.For setting a welding bar 3 . 4 and an abutment also becomes the teflon tape 7 . 8th and the plastic film web 2 from the device 1 removed and move the welding bar against the anvil. When moving together then a distance, without plastic tape and plastic films 2 , set from near zero.

Neben dem mechanischen Einstellen des Spalts unterhalb des Schweißbalkens 3, 4 wird der mechanische Antrieb 6 der Schweißbalken 3, 4 in der Weise gesteuert, daß der Schweißbalken 3, 4 in seiner Endposition mit der Geschwindigkeit von nahezu Null verfahren wird. Das wiederum bedeutet, daß kein mechanischer Impuls auf das Gegenlager oder die entgegengesetzt angeordnete Schweißleiste 4 ausgeübt wird. Da in dem erfindungsgemäßen Aufbau der Vorrichtung 1 keine Impulse auf die Schweißbalken 3, 4 oder die Gegenlager 4 ausgeübt werden, werden sämtliche Schweißungen schwingungsfrei ausgeführt. Dies wiederum führt dazu, daß der Herstellungsprozeß wesentlich ruhiger abläuft und daß weniger Verbindungsfehler in den Schweißungen auftreten.In addition to the mechanical adjustment of the gap below the welding bar 3 . 4 becomes the mechanical drive 6 the welding bar 3 . 4 controlled in such a way that the welding bar 3 . 4 is moved in its final position at the speed of almost zero. This in turn means that no mechanical impulse on the anvil or the oppositely arranged welding bar 4 is exercised. As in the inventive structure of the device 1 no impulses to the welding bars 3 . 4 or the counter-bearings 4 be exercised, all welds are performed vibration-free. This in turn means that the manufacturing process is much quieter and that less connection errors occur in the welds.

Eine Dämpfung wird somit durch das Kunststoffband 7, 8, insbesondere ein Teflonband, und die Kunststoffolie 2 hervorgerufen. Diese Schichten sind in der Vorrichtung 1 zwischen zwei Schweißbalken 3, 4 oder zwischen einem Schweißbalken 3 und einer Unterlage 4 angeordnet und können bei einfachstem Aufbau der Kunststoffolienlagen je nach Dicke der Folien 2 und Anzahl der Kunststoffbänder 7, 8 zwischen ca. 280 μm und ca. 0,6 mm variieren. Sei mehreren Folien 2 werden entsprechend größere Dicken erzeugt. Durch die minimalen Geschwindigkeiten, mit denen der Schweißbalken 3, 4 auf das Schweißmaterial trifft, können keine Impulse und somit auch keine Schwingungen im System entstehen.A damping is thus through the plastic band 7 . 8th , in particular a Teflon tape, and the plastic film 2 caused. These layers are in the device 1 between two welding bars 3 . 4 or between a welding bar 3 and a pad 4 arranged and can with the simplest structure of the Kunststoffolienlagen depending on the thickness of the films 2 and number of plastic bands 7 . 8th vary between about 280 microns and about 0.6 mm. Be several slides 2 correspondingly larger thicknesses are generated. Due to the minimal speeds with which the welding bar 3 . 4 meets the welding material, no impulses and thus no vibrations in the system can arise.

Unterschiedliche Schweißzeiten können in einfacher Weise durch ein Stillsetzen des elektrischen Antriebs 6 im Totpunkt über die gewünschte Zeit realisiert werden. Dabei verfährt der Schweißbalken 3, 4 gegen das Kunststoffband 7, 8 und verpreßt die Kunststoffolien 2. Nach dem Erreichen der erforderlichen Temperatur und der dafür benötigten Zeit ist der Schweißprozess beendet und der Schweißbalken 3, 4 verfährt wieder in seine über der Folienbahn 2 angeordnete Ausgangsposition. Da die Verfahrbewegung des Schweißbalkens 3, 4 über einen elektrischen Antrieb 6 gesteuert wird, kann die Verweilzeit zum Schweißen beliebig lange eingestellt werden, so daß die Vorrichtung 1 unabhängig von Kunststoffolien-Dicken und -Lagen arbeitet.Different welding times can be achieved simply by stopping the electric drive 6 be realized in the dead center over the desired time. The welding bar moves 3 . 4 against the plastic band 7 . 8th and pressed the plastic films 2 , After reaching the required temperature and the time required for the welding process is completed and the welding bar 3 . 4 returns to its above the film web 2 arranged starting position. As the movement of the welding bar 3 . 4 via an electric drive 6 is controlled, the residence time for welding can be set arbitrarily long, so that the device 1 works independently of plastic film thicknesses and layers.

Claims (6)

Vorrichtung zum Querschweißen oder Quertrennschweißen von Kunststoffolien (2) für eine Maschine zur Herstellung von Beuteln, Säcken oder dergleichen, mit mindestens einem hin- und herbeweglichen Schweißbalken (3, 4), unter dem die Kunststoffolien (2) zum Verschweißen hindurchgeführt werden, gekennzeichnet durch ein zwischen dem Schweißbalken (3, 4) und der Kunststoffolie (2) angeordnetes Kunststoffolienband und eine inelastische Verbindung zwischen dem Schweißbalken (3, 4) und dem Antrieb (6) für den Schweißbalken (3, 4).Device for transverse welding or cross-cutting welding of plastic films ( 2 ) for a machine for the production of bags, sacks or the like, with at least one reciprocating welding bar ( 3 . 4 ) under which the plastic films ( 2 ) are passed through for welding, characterized by a between the welding bar ( 3 . 4 ) and the plastic film ( 2 ) arranged plastic foil tape and an inelastic connection between the welding bar ( 3 . 4 ) and the drive ( 6 ) for the welding bar ( 3 . 4 ). Vorrichtung nach Anspruch 1, gekennzeichnet durch zwei gegeneinander angeordnete Schweißbalken (3, 4), die beim Zusammenfahren, ohne Kunststoffband (7, 8) und Kunststoffolien (2), auf einen Abstand von nahezu Null eingestellt sind.Apparatus according to claim 1, characterized by two oppositely arranged welding bars ( 3 . 4 ), which when moving together, without plastic band ( 7 . 8th ) and plastic films ( 2 ) are set at a distance of almost zero. Vorrichtung nach Anspruch 1, gekennzeichnet durch einen Schweißbalken (3, 4) und ein festes Gegenlager die gegeneinander angeordnet sind und deren Abstand beim Zusammenfahren, ohne Kunststoffband (7, 8) und Kunststoffolien (2), auf nahezu Null eingestellt ist.Apparatus according to claim 1, characterized by a welding bar ( 3 . 4 ) and a fixed counter bearing which are arranged against each other and their distance when moving together, without plastic band ( 7 . 8th ) and plastic films ( 2 ), set to almost zero. Vorrichtung nach einem der Ansprüche 1 bis 3, gekennzeichnet durch eine Geschwindigkeit des Schweißbalkens (3, 4), die beim Auftreffen und Zusammenpressen der Kunststoffbahn (2) und des Kunststoffbands (7, 8) auf nahezu Null eingestellt ist.Device according to one of claims 1 to 3, characterized by a speed of the welding bar ( 3 . 4 ), which impinges upon and compresses the plastic web ( 2 ) and the plastic band ( 7 . 8th ) is set to almost zero. Vorrichtung nach einem der Ansprüche 1 bis 4, gekennzeichnet durch eine Schweißzeit, die über ein Stillstehen des Antriebs (6) des Schweißbalkens (3, 4) einstellbar ist.Device according to one of claims 1 to 4, characterized by a welding time, which is about a standstill of the drive ( 6 ) of the welding bar ( 3 . 4 ) is adjustable. Vorrichtung nach einem der Ansprüche 1 bis 5, gekennzeichnet durch ein Kunststoffband (7, 8), das vorzugsweise aus PTFE gebildet ist und als Dämpfer dient, wobei die Dicke des Kunststoffbands (7, 8) etwa 0,3 mm beträgt.Device according to one of claims 1 to 5, characterized by a plastic strip ( 7 . 8th ), which is preferably made of PTFE and serves as a damper, wherein the thickness of the plastic strip ( 7 . 8th ) is about 0.3 mm.
DE10234509A 2002-07-30 2002-07-30 Transverse welding or welding and cutting machine for plastic films used in bag and sack production has a plastic band between two welding tools Withdrawn DE10234509A1 (en)

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DE102005030211A1 (en) * 2005-06-29 2007-01-11 Robert Bosch Gmbh Roll sealing equipment for sealing films has sealing roll and swiveling heating roll onto which pressure is applied normal to their contact line by servomotor driving spindle and nut linked to linear guide supporting heating roll
DE102009053014A1 (en) 2009-02-10 2010-08-19 Lemo Maschinenbau Gmbh Method and device for welding plastic films
CN102514236A (en) * 2011-12-15 2012-06-27 吴江市英力达塑料包装有限公司 Film welding device for zip-lock bags made of plastic films

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US4449962A (en) * 1981-03-12 1984-05-22 Maquinas Npu Ltda. Cutting/sealing device for plastic bag making machines
DE3249893C2 (en) * 1982-03-26 1989-10-05 Franz Bendig Process and device for producing bags or similar packages from thermoplastic film
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005030211A1 (en) * 2005-06-29 2007-01-11 Robert Bosch Gmbh Roll sealing equipment for sealing films has sealing roll and swiveling heating roll onto which pressure is applied normal to their contact line by servomotor driving spindle and nut linked to linear guide supporting heating roll
DE102009053014A1 (en) 2009-02-10 2010-08-19 Lemo Maschinenbau Gmbh Method and device for welding plastic films
CN102514236A (en) * 2011-12-15 2012-06-27 吴江市英力达塑料包装有限公司 Film welding device for zip-lock bags made of plastic films

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