DE4112633A1 - METHOD FOR CLOSING AN OPENING OF A TUBULAR CONTAINER AND LOCKING FOR SUCH A CONTAINER - Google Patents

Abstract

A process and a device for closing an aperture in a tubular container designed especially for fluids and consisting of paper or cardboard with a sealing coating on at least one side, involve closing the upper container aperture by folding the four container sides at the top over one another and securing them. To allow the closure to be easily opened by pulling up one side of the closure to form a pouring lip and to sealingly secure the four folded container sides, a foil-like sealing component is adhesively secured to the inner surface of the front of the container after folding of the sides. Thus, in particular, the free folded edges of the container sides are sealed and firmly secured to the bordering regions of the adjacent sides without the surfaces folded on top of one another being stuck together. When the container is opened by pulling up the pouring lip side of the closure, the sealing component is easily separated along the folded sides to which the pulled-up side is attached, thus facilitating opening the closure.

Description

The invention relates to a method for closing an opening of a tubular container, in particular is especially intended for liquids and in particular made of paper or cardboard coated with PE on both sides material consists of an opening wall, which in the Area of the opening of the container to be closed through one or more edge fold lines from the container wall is divided and the opening of the container surrounds all around, to form a closure along of the edge fold lines folded inwards and on top of each other and is glued together in some areas and where the glue when opening the lock later by pulling up at least parts of the opening wall can be solved.

The invention has particular relevance for a method where the opening wall consists of four sides, in the area of the opening of the container to be closed ters by square edge folding lines from the Container wall are divided and the opening of the Container surrounded all around, to form a closure along the edge fold lines and a triangle pattern following from oblique fold lines on the pages inside as well as folded up and ver stick and when you open the closure later by pulling up and loosening the adhesive if necessary one spout formed from this side can be.

Finally, the invention relates to a closure, the use in the context of the aforementioned procedures should find.

A method of closing an opening of a tubular container made of paper material is from the  Document EP-B1-1 62 883 known from which also a corresponding closure emerges. This closure, that summarized after the beginning The process being produced points towards others Containers or packaging for liquids in particular for milk, fruit juices etc. considerable advantages such as easy manufacturability in automated manufacturing process, good material utilization through suitable forms for the cardboard or paper cutting of the container tube lings, low container weight in relation to that Liquid volume, optimal stackability and space utilization during storage and transport as well as for Storage at the consumer, but above all a very easy handling when opening the closure and when pouring the liquid. For explanation added that the closure with the container still empty and is made with the floor still open, then filling the container upside down and then the floor opening that is now on top of the container closed in a conventional manner is so that an overall cube-shaped container arises.

The invention has for its object the manufacture and further facilitate handling of the closure, but above all a liquid-tight closure in a simple and reliable manner with as much as possible simple means. In addition, the Ferti supply of the container parts and the production of the Ver be automatable in the end.

To achieve this object, the invention provides that - starting from the one mentioned at the beginning Procedure - the folded areas of the Opening wall from the inside of the container  Gluing in at least one film-like closing element, that also by applying or spraying or the like Adhesive layer can be formed, glued together be, especially the inner edges of the first areas folded inwards by the closing element are connected to the adjacent areas in this way, that at least the one or the opening the shutter as the first raised areas by tearing the Closing element along the corresponding inner edges are detachable from neighboring areas.

Accordingly, the solution for the process is that at the beginning it was named second that the pages in the folded position by the container At least one film is glued inside stick closing element, which can also be applied or Spraying or the like. An adhesive layer can be formed can be glued together, in particular the inner edges of the pages folded in first through the closing element in this way with the adjacent ones Areas of the later folded pages are connected, that at least when opening the shutter as first side pulled up by tearing the clasp element along the corresponding inner edges of the neighboring pages can be solved.

The difference between the two described above The main procedure is that it is the second process around a cuboid container, at least around a container with a rectangular cross cut, acts, while the cross section in the first mentioned method is practically arbitrary. The invention is equally applicable to both methods because the main idea of the invention is based on the Inner surface of the closure-side face of the Be  to stick a foil-like closing element, that the exposed edges and the adjacent Surfaces so connected that the closure is producible, namely the folded one on top of the other th parts of the opening wall or the folded ones Sides of the opening sealed together or attached to each other. In other words are in the method according to the invention - at a cuboid container - four sides as before to Closing the later pouring opening - self-locking always with the bottom of the container still open - one on top of the other folded, and in this position they are stacked folded sides from the inside, i.e. from the inside of the container forth, connected to each other by gluing or gluing a film-like closing element. Instead of closing can also be sprayed with a suitable element Adhesive form an adhesive layer that the neighboring Edges and surfaces connect so that a unwanted unfolding of the unfolded wall parts or pages can not be done and above all the closure is absolutely liquid-tight because it all areas or spaces, openings, slots or the like. Detected by the liquid can penetrate outside. It is very important that this foil-like closing element or the adhesive layer at Open the closure by the consumer without is further solvable, namely along the edges of the Side can tear accordingly when opening of the container is unfolded first. Naturally the other edges must also be released accordingly if there are other sides of the container opening pulled up and unfolded.

The introduction and sticking or gluing of such Closing element or the formation of a correspond  the adhesive layer is easily possible in terms of production, especially when the tubular container blank held on a mandrel when making the closure is on the outer end face a corresponding Closing element can be arranged and held so that the sides of the container opening on top of the mandrel foldable and bring it into contact with the closing element are cash.

Preferably used for easy opening of the closure a pull tab that is known per se.

In any case lies with the method according to the invention an optimal solution to the above task.

A closing element is preferably made of PE film or made of PE-coated material and used by heating of the closing element and that after unfolding the sides accessible from the inside of the container or there exposed areas of the sides glued. The Ver welding a closing element made of PE film with the outer PE coating of the container sides can be in the production with relatively simple means as well at very high speed and in a reliable manner carry out.

The shape of the film-like closing element is arbitrary, as long as the function of the closing element is guaranteed is. Preferably, the entire with the closing element Inner surface of the closure-side end face of the container ters detected, but at least all edge areas, for ver bind adjacent areas or pages.

An inventive closure for closing a Opening a tubular container, in particular is intended for liquids and in particular  PE or paper material coated on both sides exists, and manufactured according to one of the two known methods mentioned in the beginning, is fiction moderately characterized in that on the inner surface the closure-side end of the container, the through the inside exposed areas of each other folded opening wall or sides is formed, a when opening the closure by pulling up min at least part of the opening wall or the sides separable film-like closing element that also can consist of an applied adhesive layer, the inside of the container is glued on in a sealing manner is. A closure manufactured in this way, the can be produced by various and arbitrary processes guarantees an absolutely liquid-tight Seal the later pouring side of the container from the inside of the container, i.e. with the container still open ground.

For the intermittent gluing of the locking element for ver close the opening of the tubular container is after an inventive development provided that the made of PE film or PE coated material Closing element on the free end face of a mandrel preferably a multi-armed rotor with corresponding mandrels at the outer end, laid on, heated there and to the inside surfaces of the four folded sides of the container top, that is to the front inner surface of the container top, is pressed. In this way, appropriate design of the process and the process institutions also use a high number of work cycles are sufficient as an absolutely liquid-tight closure of the Container top. The inner surfaces against which the heated Closing element is pressed, at the latest when pressed of the closing element also acti on the inner surfaces  fourth, as mentioned several times above.

In particular, he is for gluing the locking element According to the invention preferred that after pulling the Rohrför container open on both sides on the mandrel and after placing the closing element on the free end face of the mandrel the container upper part is folded and the closing element is heated or already during folding and under pressure from the outside on the front surface of the Upper part of the container and from the inside through the mandrel to the level if heated front inner surface of the upper part of the container is glued. It is also conceivable to start with the closing element place on the free end face of the mandrel and only then the tubular container open on both sides on the mandrel wind up. The result is essential in both cases the same.

The speed of work when performing the procedure depends largely depends on the devices used. For the he heating and gluing the locking element is therefore invented In accordance with the invention, a device is proposed which is characterized by is that the head of the mandrel made of insulating material like Ceramic or plastic, the end face with a extremely fine coating made of ferritic material is, which in turn is covered with a PTFE skin, and that for pressing the front of the upper part of the container against the End face of the mandrel head, on which the closing element can be placed, a press ram is provided in which an In induction coil for extremely brief inductive heating, e.g. B. for a period of 0.4 sec., Of the ferritic excess train of the mandrel head is arranged. If necessary, the area of the. below the ferritic coating Dornkopfes can also be cooled to heat up on a to avoid undesirably high temperature levels.  

This device according to the invention allows a very high Work cycles by heating and gluing the lock element in no time. Since only the sheer ferri table cover on the end face of the mandrel head inductive is heated and since the during a heating cycle of z. B. 0.4 sec. Heat immediately transferred from the PE- Existing closing element and the adjacent interior Surface of the upper part of the container removed or for heating is used, there is practically a heat or Temperature oscillation, especially during tempera peaks in the ferritic coating the heating of the PE Foil of the closing element takes place while when the induct tion coil is turned off and no heat in the ferriti is produced, the temperature of the ferritic Metal drops sharply. Through the PTFE skin with which the ferri table cover is covered, the closure is glued on element or parts of the closing element Ver. PE film on this mounting surface for the locking element avoided. When pressing the ram against the front The heated PE closure goes outside of the upper part of the container element completely on the front inner surface of the Be container top and performs the desired complete liquid-tight sealing of this inner surface.

Bores can preferably be acted upon by vacuum in the end face of the mandrel head to hold the clasp in place element provided during heating, etc. It understands of itself that the period of negative pressure supply as well as the respective duration of action of the inductive heater on the individual phases of gluing of the closing element provided work cycle have to be.

As an alternative to the above method for heating the Closing element by means of inductive heat is erfindungsge  according to a device provided, characterized in that is that a heatable for heating the closing element, PTFE-coated plate on the outside of the mandrel closes and the face of the plate the receiving surface forms for the closing element before and during gluing. Preferably the plate is by a snap lock or easily exchangeable for other quick attachments. In contrast to inductive heating, this one Plate with a heater arranged in the plate Temperature level reached on the free face of the plate and kept constant, that at least a softening one up the plate of the closing element made of PE film leads. In this state, the closing element in the same way as an inductively heated closing element against press the front inner surface of the upper part of the container and glue it there to seal it. The PTFE coating of the preferably made of light metal such as aluminum plate prevents PE film from sticking to the face of the Plate. After softening and pressing on the front The inner surface of the upper part of the container is made of PE film existing locking element rather rather completely on this Inner surface above.

Below are embodiments of the invention explained in more detail with reference to the drawings. In the Show drawing:

Figure 1 is a perspective view of an upper part of a tubular container blank with the opening still open, but with a pull tab already glued in place.

Figure 2 is a perspective view of the top of the container after the four sides surrounding the opening of the container have been unfolded;

Fig. 3 is a plan view of the inner surface of the end face of the container of Figure 2, so viewed from the inside of the container .

Fig. 4, 5 and 6 are plan views of a sheet-adhered closure member with a different shape;

Fig. 7 is a plan view of the stamped blank of the container blank for display of activatable regions of a PE coating;

Fig. 8 is a plan view of the inner surface of the container end face as in Figure 3, but after gluing the film-like closing element according to Fig. 4.

Figure 9 is again a top view of the inner surface of the end face of the container as shown in Figures 3 and 8, but after opening of the container by pulling up the so-called spout side of the container opening to open the shutter...;

Fig. 10 is a plan view of the closure of the container as opened in Fig. 9, but seen from the outside and from above.

Fig. 11 is a schematic cross-sectional view of a heating and pressing device at the outer end of a mandrel for heating and gluing a closing element made of PE film;

FIG. 12 is an X in Figure 11 marked detail of the device of Fig. 11.;

Fig. 13 is a sectional view of another Heiz- and Preßvor direction for the same purpose as the device shown in Figures 11 and 12.

FIG. 14 shows a top view of the device from FIG. 13 in section along the line XIV-XIV from FIG. 13.

In Fig. 1, an upper part, based on the later position of use, of a generally designated 1 container is shown, which consists of a container blank 2 made of PE-coated paper material on both sides, which is partially shown in Fig. 7.

The tubular unfolded and connected along a seam 9 container wall 3 has in the upper area a corresponding square circumferential edge fold line 4 , above which the four sides involved in the closure lie, namely a pouring side 5 , from which a spout is formed when the closure is opened can, a rear neighbor side 6 , a front neighbor side 7 and a side 8 opposite the pourer side 5 , along which the seam 9 runs. These four sides form the opening of the container 1, generally designated 10 .

In the pourer side 5 , practically a triangular oblique fold lines 11 are embossed with the corresponding edge fold line. Corresponding fold lines 12 have both neighboring sides 6 , 7 . Particularly noteworthy is the arched bulging edge 13 of the spout side 5 , which when folded up brings about the necessary overlap to the side 8 and moreover provides a favorable shape for the later spout.

The container blank 2 in FIG. 7 reveals that the pouring side 5 is longer than the opposite side 8 , so that when folding, the conditions shown in FIG. 2, for example, result later. Correspondingly, the upper edge of the neighboring sides 6 , 7 also has an increasing profile towards the spout side 5 . An air outlet opening 14 is created when the closure is opened, which is shown in FIG. 10 and is intended to facilitate the inflow of air when liquid flows out of the container 1 .

On the inner surface of the pouring side 5 , in the position shown in FIG. 1, a pull tab 20 is already glued, which, when the container 1 is closed at its upper opening 10 , assumes the position shown in FIGS. 2 and 3, for example, so that it is easy to pull up to open the container.

To integrate in the closure is shown in Fig. 4, 5 and 6 in various forms and generally my designated 15 closing element. It consists of a piece of PE film as a square 16 according to FIG. 4, with recesses 17 at the edges according to FIG. 5 and as a crossed strip of strips 18 , 19 according to FIG. 6. It is essential for the shape of the closing element 15 that it folds when opened of the four sides 5 , 6 , 7 , 8 resulting edges 31 , 32 , 33 , 34 of the inner surfaces of the sides 6 , 7 , as shown in Fig. 3, with the respective adjacent inner surfaces of the two sides 5 , 8 absolutely sealing their entire length are connected. In the case of the square 16 of FIG. 4, the closing element 15 covers the entire square inner surface of the upper container end face shown in FIG. 3. If the closing element 15 , regardless of whether the embodiment according to FIG. 4, 5 or 6 is chosen, all edges 31 , 32 , 33 , 34 are welded or glued or connected continuously to adjacent areas in this way, they are inside the container exposed triangular areas of the sides 5 , 6 , 7 and 8 , as shown in FIG. 3, firmly and sealingly connected to one another along the edges 31 , 32 , 33 , 34 .

To close the opening 10 , the inner surfaces of the sides 5 , 6 , 7 and 8 are activated at predetermined triangular areas by hot air, namely in accordance with the triangular pattern shown in FIG. 7 with vertical hatching. The activated areas are the triangles F _h , which are delimited on their upper sides by the fold lines 11 and 12 and on their lower side by the edge fold lines 14 , as shown in FIG. 7.

Then the neighboring pages 6 , 7 are first folded along their oblique fold lines 12 and folded inward along their edge fold lines 4 . It follows the folding of the spout side 5 opposite side 8, on which the spout side 5 is folded as the last of the four sides along the Randfaltlinie 4 and with the arcuate edge 13 and the pull-tab 20 is folded onto the outer surface of the opposite side. 8 In this position, the closing element 15 is glued from the inside of the container onto the inside surface of the container end face, as shown in FIG. 3, in the heat, so that the image according to FIG. 8 results.

However, the order of heating the PE coating on pages 5 , 6 , 7 , 8 and unfolding these pages can also be reversed. In this case, the unfolding is first carried out until the state according to FIG. 3 is reached, and only then does the heating or activation of the F _h regions take place, namely the entire exposed inner surface of the end face of the container 1 , which is shown in FIG. 3 is shown. The entire inner surface is activated when the square 16 is used as the closing element 15 .

In any case, the state of FIG. 8 results in the course of the method, where the closing element 15, by connecting the edges 31 , 32 , 33 , 34 to the adjacent surface areas, continuously seals the gaps or slot-shaped openings there, and at the same time the four sides 5 , 6 , 7 , 8 firmly joined together from the inside.

The pull-on tab 20 is expediently glued onto the outer surface of the side 8 during the production of the adhesive bond or at another time so that it lies as flat as possible on the outer surface of the side 8 during transport.

After filling in a liquid and after closing the bottom of the container 1 in any conventional manner, the container 1 reaches the store and from there to the consumer, who opens the container 1 again. For this purpose, the pull tab 20 is easily detached from the side 8 with two fingers and the spout side 5 is pulled up with it. When pulling up the spout side 5 , the triangular inner surface (see FIG. 3 or 8) of the spout side 5 progressively tears along the edges 31 , 32 from the center outwards from these inner folded edges of the two adjacent sides 6 , 7 . Only this tearing of the inner folded edges 31, 32 of the adjacent sides 6 , 7 consequently forms the pull-up resistance which is thus easy to overcome.

A spout 30 can easily be formed from the spout side 5 , as shown in FIGS. 9 and 10, by correspondingly folding the spout side 5 along the oblique fold lines 11 . Air has easy access to the interior of the container through the air outlet opening 14 , so that the outflow of the liquid from the container 1 is not hindered.

The pull tab 20 can easily tear off the spout side 5 , so that it does not form an obstacle when pouring the liquid from the spout 30 .

FIGS. 9 and 10 illustrate the shape of the opened container and in particular the pouring spout 30 , both from the inside of the container ( FIG. 9) and from the outside when looking at the upper part of the container.

Machining the closure can be like follows:

In a machine for processing the containers blanks for filling and closing the container a multi-armed rotor arranged, which is clocked drives circulating and in use during one circulation the container securely seals the upper opening.

For this purpose, the tubular unfolded container in a lower angular position on one accordingly square mandrel, the cross section of the Container blank corresponds. The acti now takes place crossing of the triangular areas of the inner surfaces the sides forming the opening of the container. Then  The four sides end in the manner described folded up, and now this is also acti fourth closing element made of PE film on the inner surface the front of the container and firmly pressed there, with the folded pages on the back appropriate counter pressure can be maintained. To this The closing element becomes firm and sealing glued to the inside surface of the front of the container. The Process of activating the triangular areas and that However, as noted above, folding the pages can run in reverse order. Definitely is the closure after gluing the locking element finished in the container.

The container can now be removed from the mandrel and automatically transfer to fill the liquid be ported.

Two devices for activating or heating and gluing the closing element 15 made of PE film during the above-described work cycle are shown in FIGS. 11 and 12 or 13 and 14.

In the first device according to FIGS. 11 and 12, the head 38 of the mandrel on which the container 1 is accommodated is made of ceramic or plastic, in any case from an electrically insulating material. The end face 39 of the mandrel head 38 is provided with a coating 40 made of ferritic metal with a thickness of approximately 20 my, which in turn is covered with a PTFE skin 41 . The surface of the PTFE skin 41 forms a receiving surface 42 for the closing element 15 . During the work cycle of gluing the closing element 15 into the container 1 , the mandrel head 38 is opposite a press ram 43 in which an induction coil 44 is arranged and provided with a corresponding power supply.

To glue the closing element 15 into the container 1 , the closing element 15 is placed on the receiving surface 42 of the PTFE skin 41 and held in place by means of negative pressure, which is effective via bores 45 in the end region of the mandrel head 38 which can be subjected to negative pressure.

As soon as the container 1 is pulled up in the schematically illustrated manner on the mandrel head 38 or the tube-shaped, open-sided container 1 is pulled up on the mandrel head 38 and has been folded at its outer end in the manner already described above, with simultaneous Activating the triangular inner sides 5 , 6 , 7 , 8 , the press ram 43 is guided against the mandrel head 38 (see arrow 46 ). By activating the induction coil 44 for a short heating time of, for example, 0.4 seconds, the closing element 15 made of PE film 15-20 my is now heated by the inductive heat generated in the coating 40 made of ferritic metal, whereupon the press die 43 is further guided against the mandrel head 38 and the end faces of the container 1 and the closing element 15 are compressed between the lower surface 47 of the ram 43 and the receiving surface 42 such that the heated and activi fourth closing element 15 firmly on the likewise activated PE coating the inner surface 37 of the end face of the container 1 sticks. After removing the press ram 43 from the mandrel head 38 , the closing element 15 is sealed in the container ter 1 .

In the second alternative to use heating and Preßvor direction in FIG. 13 and 14 of the mandrel 58 is located at the outer end a plate 50 of the mandrel 58 is fixed with the interposition of an insulating plate 53 by means of screws 51 to the head 52. The head 52 has a shaft 60 at the bottom, which can be inserted into a bore 61 and fastened there by means of screws 54 , the inner ends of which engage in corresponding recesses 55 in the wall of the shaft 60 . With the quick attachment formed in this way, the head 52 can be quickly replaced.

In the plate 50 a heater 59 is disposed, is formed around the coated with PTFE end face of the plate 50, the area receiving 57 for the closing member 15, raturniveau on a Tempe to keep the down an inclined to the receiving surface 57 closing element 15 to such an extent brought to soften ge or can be made sticky that it is glued to the end-side inner surface 37 of the container 1 under appropriate pressure application (press ram not shown). Via holes 56 in the plate 50 which can be acted upon by vacuum, the closing element 15 placed on the receiving surface 57 can be held.

Otherwise, the function of this second heating and Preßvor direction and also the feasible working cycle of gluing the closing element 15 is similar to the case of the above-described first heating and pressing device, so that a further description is dispensed with.

Reference symbols in FIGS. 11 and 12 that require explanation:

15 - PE film 15-20 µ
47 - PTFE 200 / 60-100 ° C
40 - Ferritic metal 200 / 60-100 ° C
1 - box PE-coated
38 - Material: ceramic / plastic
43 - ram
44 - induction coil
available heating time 0.4 sec

Claims (12)

1. A method for closing an opening of a tubular container, which is particularly intended for liquids and in particular consists of PE-be coated paper or cardboard material on both sides, wherein an opening wall in the region of the opening to be closed by one or more Edge folding lines are divided from the container wall and surrounds the opening of the container all around, folded to form a closure along the edge folding lines inwards and on top of one another and partially bonded to one another, and the adhesive is released by pulling up at least parts of the opening wall when the closure is later opened can be characterized in that the areas of the opening wall folded onto one another by gluing in from the inside of the container at least one film-like closing element, which can also be formed by applying or spraying or the like. are glued to one another, in particular the inner folded edges of the regions first folded inwards being connected to the adjacent regions by the closing element in such a way that at least the region or regions which are opened when the closure is opened are torn up by tearing the closing element along the corresponding inner folded edges of the Neighboring areas are solvable. 2. The method of claim 1, wherein four pages that in the area of the opening of the container to be closed ters through square edge folding lines from  the container wall and the opening surrounded the container all around to form a Closure along the edge fold lines and one Triangle pattern from oblique fold lines on the sides following inside as well as unfolded and can be glued together and later opened the closure by pulling up and if necessary Detach one side of a spout can be formed from this side, thereby characterized in that the pages in the unfolded position by the container gluing in at least one inside foil-like closing element, which can also be opened wear or spray or the like. An adhesive layer can be formed, glued together, especially the inner folded edges of the first pages folded inwards by the closing element so with the adjacent areas of later folded pages are connected that at least the first to be raised when the shutter is opened pulled side by tearing the closing element along the corresponding inner fold edges of the neighboring pages can be solved. 3. The method according to claim 1 or 2, characterized ge indicates that a closing element made of PE film or PE coated material used and by Heating the closing element and that after opening fold the sides together from the inside of the container accessible areas of the pages and pressing the closing element is glued in. 4. The method according to any one of claims 1 to 3, characterized characterized in that with the closing element the entire inner surface of the closure side  Front of the container is detected, at least but all fold edge areas, for connecting and Sealing adjacent areas or Pages. 5. The method according to one or more of claims 1-4, characterized in that the PE- Closing foil or PE-coated material element placed on the free end face of a mandrel, heated up there and touched the inner surfaces of the four other folded sides of the upper part of the container the front inner surface of the container top is pressed. 6. The method according to claim 5, characterized in net that after winding the tubular, bilateral open container on the mandrel and after placing the Closing element on the free end face of the mandrel Container top is folded and the closing element heated now or already during folding and under External pressure on the front surface of the Be top of the container and from the inside through the mandrel on the flat if heated front inner surface of the container top partly glued. 7. Apparatus for carrying out the method according to claim 5 or 6, characterized in that the mandrel head ( 38 ) consists of insulating material such as ceramic or plastic, the end face ( 39 ) with an extremely fine coating ( 40 ) made of ferritic metallic mate rial is, which in turn is covered with a PTFE skin ( 41 ), and that for pressing the end face of the container ( 1 ) against the end faces ( 39 ) of the mandrel head, on which the closing element ( 15 ) can be placed, a press stamp ( 43 ) is provided in which an induction coil ( 44 ) is arranged for extremely brief inductive heating of the ferritic-metallic coating ( 40 ) of the mandrel head ( 38 ). 8. The device according to claim 7, characterized by bores ( 45 ) which can be subjected to negative pressure in the end face of the mandrel head ( 38 ) for holding the closing element ( 15 ). 9. A device for performing the method according to claim 5 or 6, characterized in that a for heating the closing element ( 15 ) heated, externally coated with PTFE and preferably made of light metal such as aluminum plate ( 50 ) closes the end of the mandrel ( 58 ) and the end face of the plate ( 50 ) on the receiving surface ( 57 ) for the closing element ( 15 ) before and during the gluing forms. 10. The device according to claim 9, characterized in that the plate ( 50 ) with the head ( 52 ) by means of a quick attachment ( 54 , 55 ) easily detachable from the mandrel ( 58 ) and thus quickly replaceable. 11. Closure for closing an opening of a tubular container, particularly for liquid is determined and in particular from both sides PE-coated paper or cardboard material, with an opening wall that in the area of the closing opening of the container through a or several edge fold lines from the container wall is divided and the opening of the container all around surrounds, to form a closure along the Edge folding lines inwards and on top of each other and is glued together in areas, and the bond when opening the Ver  by pulling up at least parts the wall is severable, especially if the opening of the tubular container in quadra table or rectangular arrangement from four sides is formed in the area to be closed Opening of the container through a square Edge folding lines separated from the container wall be and the opening of the container all around give to form a closure along the Edge folding lines as well as a triangular pattern from oblique Fold lines on the pages following inwards as well folded up and glued together and when opening the closure later Pull up and loosen the bond if necessary one spout formed from this side can be characterized by that on the inside surface of the forehead on the fastener side side of the container that is exposed through the inside the areas of the opening wall folded onto one another or the folded pages is when opening the closure by pulling it up at least part of the opening wall or of the pages that can be folded over film-like closing element, which also consists of a applied adhesive layer may consist of the container inner sealing side is glued on sealing. 12. Closure according to one or more of the preceding claims, characterized in that the closing element ( 15 ) consists of PE film or PE-coated material.