EP2955011A1 - Method and device for manufacturing a container - Google Patents

Abstract

The invention relates to a method for producing a cup from a conical sleeve and a cup-shaped bottom, wherein the bottom has a bottom surface and an outgoing from the bottom surface peripheral wall and from a larger opening of the conical sleeve forth in the direction of the smaller opening of the sleeve in the sleeve is inserted. According to the invention, the steps of at least partially covering a radially outer circumferential surface of the wall of the pot-shaped bottom with an annular cover sleeve, the delivery of the cover together with the bottom in the direction of the smaller opening of the sleeve, to a predefined relative position between the sleeve and the bottom is reached, the extraction of the cover sleeve between an inner side of the sleeve and the radially outer peripheral surface of the bottom, wherein the bottom remains in the predefined relative position, and the substantially liquid-tight connection of the radially outer peripheral surface of the bottom and the inside of the sleeve.

Description

The invention relates to a method for producing a cup from a conical sleeve and a cup-shaped bottom, wherein the bottom has a bottom surface and an outgoing from the bottom surface peripheral wall and from a larger opening of the conical sleeve forth in the direction of the smaller opening of the sleeve in the sleeve is inserted. The invention also relates to a device for producing a cup from a conical sleeve and a cup-shaped bottom, wherein the device for inserting the bottom is formed by a larger opening of the conical sleeve in the direction of the smaller opening of the sleeve in the sleeve.

Known methods of making a cup and prior art devices may encounter problems in inserting the cup-shaped bottom into the conical sleeve when the bottom adheres to the inside of the sleeve during insertion and thereby impedes proper placement of the bottom in the sleeve , This can happen, for example, if the bottom and / or the sleeve is already coated with adhesive, if, for example, only due to the ambient temperatures, the material of the bottom and / or the sleeve is sticky or at least between the bottom and sleeve is a high coefficient of friction. The problem here is that due to the conical sleeve and the subsequent liquid-tight pressing of the bottom and sleeve of the soil must be brought into a position within the sleeve in which he necessarily rests against an inner wall of the sleeve. Otherwise, a pressing of the soil with the sleeve is not possible.

With the invention, a method and an apparatus for producing a cup of a conical sleeve and a cup-shaped bottom to be improved.

According to the invention, a method with the features of claim 1 is provided for this purpose. Advantageous developments of the invention are specified in the subclaims.

According to the invention, the at least partially covering a radially outer peripheral surface of the wall of the cup-shaped bottom with an annular cover sleeve, arranging the cover and the bottom in a predefined relative position between the sleeve and the bottom, the extraction of the cover between an inner side of the sleeve and the radially outer peripheral surface of the bottom, wherein the bottom remains in the predefined relative position, and provided the substantially liquid-tight connection of the radially outer circumferential surface of the bottom and the inside of the sleeve. According to the invention thus an annular cover sleeve between a radially outer peripheral surface of the wall of the cup-shaped bottom and the inside of the sleeve is arranged. Thus, when delivering the soil, only the outside of the cover sleeve comes into contact with the inside of the sleeve. The outer side of the cover sleeve can be selected with respect to the material or the surface so that the cover sleeve can slide smoothly along the inside of the sleeve. Only when the bottom has reached a predefined relative position to the sleeve, the cover sleeve between the peripheral wall and the inside of the sleeve is pulled out. At this time, the bottom and the sleeve relative to each other but already at rest and at the intended relative position. A possible adhesion of soil and sleeve in this position is thus harmless and even desirable in the subsequent step of liquid-tight bonding. With the invention, a considerable improvement of a method for producing a cup is achieved in a surprisingly simple manner. In the context of the invention, the covering sleeve can be delivered together with the ground into the sleeve or the covering sleeve can rest relative to the sleeve and the bottom is pushed into the covering sleeve. Particular advantages of the method according to the invention then, if due to the materials of the bottom and sleeve adhesion of the soil to the sleeve in a relative movement is to be feared each other. The invention is thus designed in a special way for materials whose surfaces have a high coefficient of friction to each other. This can be, for example, coated paper material or coated cardboard, for example, but also paper-like to be processed flat plastic material. Flat plastic materials are, for example, also plastic laminates. The invention is very well suited for paper-like plastic material to be processed, but not specifically designed for paper-like plastic material to be processed.

In a further development of the invention, the predefined relative position, as seen in the longitudinal direction of the sleeve, corresponds to the relative position of the base and sleeve on the finished cup.

In this way, bottom and sleeve relative to each other must not be moved after the cover sleeve between the peripheral wall of the bottom and the inside of the sleeve has been pulled out. Minor displacements during liquid-tight bonding of the bottom and sleeve are excluded.

In a further development of the invention, in the predefined relative position, an outer peripheral surface of the cover sleeve is located at least in sections on the inner side of the sleeve or is arranged directly adjacent to the inner side of the sleeve.

In this way, the peripheral wall of the bottom and the inside of the sleeve can be brought very close to each other without being in direct contact. For example, the bottom can be arranged under slight bias in the cover sleeve, so that the peripheral wall slightly widened after pulling out of the cover and then the peripheral wall of the bottom rests flat against the inside of the sleeve.

In a further development of the invention, it is provided to deliver the cover sleeve together with the base in the direction of the smaller opening of the sleeve until the predefined relative position is reached.

According to the invention, an apparatus for producing a cup from a conical sleeve and a cup-shaped bottom with the features of claim 5 is provided. Advantageous developments of the invention are specified in the subclaims.

According to the invention, the device for producing a cup from a conical sleeve and a cup-shaped bottom for inserting the bottom of a larger opening of the conical sleeve forth in the direction of the smaller opening of the sleeve is formed in the sleeve. The device has an annular cover sleeve whose inner circumference is so large that a peripheral wall of the cup-shaped bottom bears against the inner circumference. Further, the device comprises means for moving the cover sleeve in and against a longitudinal direction of the sleeve and means for retaining the bottom in a predefined relative position to the sleeve while pulling the cover sleeve between the inside of the sleeve and the peripheral wall of the bottom. With the device according to the invention the production of a cup of a conical sleeve and a cup-shaped bottom is greatly facilitated, especially if the materials or the surfaces of the bottom and sleeve have a high coefficient of friction to each other and therefore the adhesion of the bottom of the sleeve at a relative movement is to be feared. This can occur, for example, in liquid-tight coated paper material or in paper-like plastic materials to be processed.

In a further development of the invention, a stamp for holding the bottom is provided, wherein the punch has an actuating rod and a voltage applied to the ground stamp surface, wherein the cover sleeve is slidably mounted on the actuating rod of the punch.

In this way, the cover can be arranged for example exactly concentric with the actuating rod and also during withdrawal of the cover between an inner side of the sleeve and the radially outer circumferential surface of the bottom is the cover safely guided. The device according to the invention can thereby achieve high speeds and thus low cycle times in the production of cups.

Fig. 1

eine schematische Schnittansicht einer Vorrichtung zum Herstellen eines Bechers in einem ersten Zustand,

Fig. 2

die vergrößerte Einzelheit I aus Fig. 1,

Fig. 3

eine schematische Schnittansicht der Vorrichtung der Fig. 1 in einem zweiten Zustand,

Fig. 4

die Einzelheit IV der Fig. 3 in vergrößerter Darstellung,

Fig. 5

eine schematische Schnittansicht der Vorrichtung der Fig. 1 in einem dritten Zustand,

Fig. 6

die Einzelheit VI der Fig. 5 in vergrößerter Darstellung,

Fig. 7

eine schematische Schnittansicht der Vorrichtung der Fig. 1 in einem vierten Zustand,

Fig. 8

die vergrößerte Einzelheit VIII aus Fig. 7,

Fig. 9

die Vorrichtung der Fig. 1 in einem fünften Zustand,

Fig. 10

die Einzelheit X der Fig. 9 in vergrößerter Darstellung,

Fig. 11

die Vorrichtung der Fig. 1 in einem sechsten Zustand und

Fig. 12

die Einzelheit XII aus Fig. 11 in vergrößerter Darstellung.

Further features and advantages of the invention will become apparent from the claims and the following description of preferred embodiments of the invention in conjunction with the drawings. Individual features of the different embodiments can be combined with one another in any desired manner, without exceeding the scope of the invention. In the drawings show:

Fig. 1

a schematic sectional view of an apparatus for producing a cup in a first state,

Fig. 2

the enlarged detail I off Fig. 1 .

Fig. 3

a schematic sectional view of the device of Fig. 1 in a second state,

Fig. 4

the detail IV of Fig. 3 in an enlarged view,

Fig. 5

a schematic sectional view of the device of Fig. 1 in a third state,

Fig. 6

the detail VI of Fig. 5 in an enlarged view,

Fig. 7

a schematic sectional view of the device of Fig. 1 in a fourth state,

Fig. 8

the enlarged detail VIII Fig. 7 .

Fig. 9

the device of Fig. 1 in a fifth state,

Fig. 10

the detail X the Fig. 9 in an enlarged view,

Fig. 11

the device of Fig. 1 in a sixth state and

Fig. 12

the detail XII Fig. 11 in an enlarged view.

Fig. 1 shows a schematic sectional view of an apparatus 10 for producing a cup of a conical sleeve 12 and a cup-shaped bottom 14. The device 10 may be part of a larger, not shown machine and for example, several of the devices 10 may be arranged on a star wheel.

The sleeve 12 has been produced by winding and gluing or sealing in the region of a non-illustrated overlap of a flat segment. The pot-shaped bottom 14 has also been produced from a flat segment. The sleeve 12 is arranged on a likewise conical mandrel 16, which has a central guide bore, in which a punch 18 is guided for holding the bottom 14. The punch 18 has an actuating rod 20 and a stamp plate 21 with a stamp surface 22. The stamp surface 22 is located at an in Fig. 1 overhead floor surface 30 of the bottom 14 at. This overhead bottom surface 30 of the bottom 14 defines on the finished cup a lower boundary of the interior of the cup to be filled with liquid. From the bottom surface of the bottom 14 is a peripheral peripheral wall 24 extends, which extends at right angles to the bottom surface. The bottom 14 is replaced by a pot-like shape.

The actuating rod 18 is provided with a through bore 26. At the bore 26, a negative pressure is temporarily applied during the production process. The through-bore 26 opens into the punch surface 22, so that after applying a negative pressure to the bore 26, the bottom surface of the bottom 14 is pulled against the punch surface 22. The bottom 14 can thereby be safely inserted into the sleeve 12 without the risk that it falls off the stamp surface 22.

In the presentation of the Fig. 1 the bottom 14 is inserted from above into the sleeve 12, ie in the direction of the smaller opening of the sleeve 12th

Below the bottom 14 there is disposed an air outlet 28 which is adapted to blow warm air against the inside of the sleeve to facilitate deformation of the sleeve, and more specifically, turning the lower end of the sleeve 12 about the peripheral wall 24 of the bottom 14. From the blowing member 28 radially warm air 29 flows out to heat the inside of the sleeve 12 in a region on which the peripheral wall 24 of the bottom 14 comes to rest below. For example, a sealable coating on the inside of the sleeve 12 can be heated, in order then to allow the peripheral wall 24 to be sealed, and thus a fluid-tight connection of the circumferential wall 24 and sleeve 12.

The enlarged detail II in Fig. 2 lets first recognize the stamp surface 22, against which the bottom surface 30 of the bottom 14 is sucked. An outer side of the peripheral wall 24 of the bottom 14 is partially covered by an annular cover sleeve 32. The cover sleeve 32 abuts against a radially outer peripheral surface of the peripheral wall 24 of the bottom 14. As will be explained, the cover sleeve 32 prevents the radially outer surface of the peripheral wall 24 from coming into contact with an inner side 34 of the sleeve 12 before a predefined relative position of the bottom 14 and sleeve 12 is reached.

The annular cover sleeve 32 is provided with an annular mounting plate 36 whose central bore is matched to the outer diameter of the actuating rod 18. The mounting plate 36 and the integrally connected with the mounting plate 36 annular cover sleeve 32 can thus be moved relative to the punch 18. In the state of Fig. 1 and the Fig. 2 an underside of the mounting plate 36 abuts on an upper side of the stamp plate 21. With its upper side, the mounting plate 36 bears against a surface of the mandrel 16.

Based on the state of Fig. 1 respectively. Fig. 2 The punch 18 is moved together with the bottom 14 and the sleeve 32 down.

This state is then in Fig. 3 shown. In the state of Fig. 3 the bottom 14 and the sleeve 12 have reached a relative position to each other, they also take each other on the finished cup. In other words, for the completion of the cup, the bottom 14 must not be moved relative to the sleeve 12, at least not in the longitudinal direction of the sleeve 12.

It is in Fig. 3 to recognize that starting from the state of Fig. 1 and the Fig. 2 the punch 18 has been moved down a path indicated by arrow 40 in FIG Fig. 3 is indicated. Because the top of the mounting plate 36 which is integrally connected to the annular cover sleeve 32 is now arranged at a distance from the mandrel 16. For this purpose, the actuating rod 18 has been displaced within the guide bore of the mandrel 16, as for example with reference to the upper end of the actuating rod 18, see Fig. 1 and Fig. 3 , is recognizable.

The enlarged detail IV Fig. 3 is in Fig. 4 and reveals that the annular cover sleeve 32 now rests on the one hand on the inside of the sleeve 12 and on the other hand on the radially outer peripheral surface of the peripheral wall 24 of the bottom 14. The inner diameter of the cover sleeve 32 may be sized so that the bottom 14th is slightly compressed, so slightly rebounded after pulling out of the cover sleeve 32, so that then the peripheral wall 24 is substantially flat against the inside of the sleeve 12. The peripheral wall 24 of the bottom 14 does not abut against the inside of the sleeve 12, although the bottom 14 and the sleeve 12 are arranged in a relative position to each other, they also take each other on the finished cup.

Starting from the state of FIG. 3 and FIG. 4 the cover sleeve 32 is then pulled up together with the mounting plate 36 between the inside of the sleeve 12 and the peripheral wall 24 of the bottom 14. This pulled out state is in Fig. 5 shown. It can be seen that the mounting plate 36 now bears against the abutment surface 42 on the mandrel 16 again. The cover sleeve 32 has now been completely pulled out between the bottom 14 and the sleeve 12 and the peripheral wall 24 abuts against the inside of the sleeve 12. From below, a multi-part punch 44 has now been inserted into the sleeve 12. This punch 44 has a plurality of movable in the radial direction pressing jaws 46, which can be pressed by a centrally disposed actuator 48 radially outward. On the outside of the sleeve 12 is located in the region of the peripheral wall 24 of the bottom 14 on an outer side of the sleeve 12, a retaining ring 50 at. This retaining ring 50 provides an abutment when the pressing jaws 48 are moved radially outward to urge the peripheral wall 24 against the inside of the sleeve 12.

It is essential that for pressing the peripheral wall 24 and the inside of the sleeve 12, starting from the state of Fig. 5 is made, no relative displacement between the bottom 14 and the sleeve 12 is required. There is therefore no risk that friction forces between a surface of the bottom 14 and a surface of the sleeve 12 must be overcome for positioning the bottom 14 in the sleeve 12.

The presentation of the Fig. 6 shows the detail VI of Fig. 5 in an enlarged view. As already explained, the peripheral wall 24 of the bottom 14 is now flat on the inside of the sleeve 12, since the annular cover sleeve 32 was pulled up between the peripheral wall 24 and the inside of the sleeve 12. The pressing jaws 46 and the retaining ring 50 now provide for a compression of the peripheral wall 24 with the inside of the sleeve 12 and thereby for a liquid-tight connection of the bottom 14 with the sleeve 12th

The presentation of the Fig. 7 shows another, on the state of Fig. 5 or 6 following process step. The pressing jaws 46 and the retaining ring 50 have been removed. In the sleeve 12 is now by means of a press ring 52, the in Fig. 7 is pushed from below onto the sleeve 12, a circumferential stacking shoulder 54 is inserted into the sleeve 12. This stack shoulder serves to reliably stack several cups in each other. A certain counterweight when sliding the press ring 52 provides the annular cover sleeve 32, which in the state of Fig. 7 is disposed radially inside the press ring 52. Several, according to the arrows 55 radially inwardly displaceable jaws 56 ensure that the lower edge 58 of the sleeve is turned radially inward. The jaws 56 are in FIGS. 7 and 8 shown in its radially inner end position. A the envelope of the lower edge 38 of the sleeve 12 causing radially inner edge of the jaw 56 is provided with a chamfer 57 which runs at a movement of the jaws 56 according to the arrows 55 on the lower edge 38 of the sleeve and the edge 38 by about 50 ° to 60 ° turns inside. Since all the jaws 56 have a chamfer 57, the edge 38 is turned inwards over its entire circumference. Another turn of the edge 38 then approximately 180 ° is effected by a punch 60, which starting from the state of Fig. 7 is moved upward according to the arrow 61. The turning over of the lower edge of the sleeve 12 is facilitated because, see Fig. 2 , the sleeve 12 has been previously heated in this envelope area.

The presentation of the Fig. 8 shows the detail VIII of the Fig. 7 in an enlarged view.

Starting from the state of Fig. 7 is, as already explained, turned over by the punch 60, the lower edge 58 of the sleeve 12 by approximately 180 °.

Fig. 10 shows the detail X the Fig. 9 in an enlarged view.

As in Fig. 11 It can be seen, starting from the state of the Fig. 9 Then, the lower edge 58 of the sleeve 12 is pressed radially outward to form a so-called circumferential frame 62 at the lower end of the sleeve 12. The frame 62 then forms the base for a finished cup.

The presentation of the Fig. 12 shows the enlarged detail XII Fig. 11 ,

Especially with the help of Fig. 3 to 6 can be seen, allows the annular cover sleeve to position the bottom and the sleeve 12 relative to each other so that they have already reached the provided on the finished cup relative position without touching the bottom 14 and the inside of the sleeve 12. In particular, touch, see Fig. 4 , the radially outer surface of the peripheral wall 24 of the bottom 14 and the inside of the sleeve 12 not until the predefined relative position is reached. A possible high coefficient of friction between the material or the surface of the bottom 14 and the inside of the sleeve 12 does not hinder the manufacturing process of the cup. After the annular cover sleeve 32 has been pulled out between the inside of the sleeve 12 and the bottom 14, the peripheral wall 24 of the bottom 14 with its radially outer surface can create a flat against the inside of the sleeve 12. Since the inside of the sleeve 12 has been previously heated in this area, a liquid-tight connection of the bottom 14 and the sleeve 12 can take place immediately. This is supported by the radially outwardly moving pressing jaws 46.

Claims (6)

A method for producing a cup from a conical sleeve (12) and a pot-shaped bottom (14), wherein the bottom (14) has a bottom surface (30) and a peripheral wall extending from the bottom surface (30) and a larger opening of the conical Sleeve (12) forth in the direction of the smaller opening of the sleeve (12) in the sleeve (12) is inserted, with the steps: at least partially covering a radially outer circumferential surface of the wall of the cup-shaped bottom (14) with an annular covering sleeve (32), Arranging the covering sleeve (32) and the bottom (14) in a predefined relative position between the sleeve (12) and the bottom (14), - Pulling the cover sleeve (32) between an inner side of the sleeve (12) and the radially outer peripheral surface of the bottom (14), wherein the bottom (14) remains in the predefined relative position, and - Substantially liquid-tight connection of the radially outer circumferential surface of the bottom (14) and the inside of the sleeve (12). A method according to claim 1, wherein the predefined relative position, as viewed in the longitudinal direction of the sleeve (12), corresponds to the relative position of the bottom (14) and sleeve (12) on the finished cup. A method according to claim 1 or 2, characterized by advancing the cover sleeve (32) together with the bottom (16) in the direction of the smaller opening of the sleeve until the predefined relative position is reached. The method of claim 1, 2 or 3, wherein in the predefined relative position, an outer peripheral surface of the cover (32) on the inside of the sleeve (12) at least partially abuts or is disposed immediately adjacent to the inside of the sleeve (12). Device for producing a cup from a conical sleeve (12) and a cup-shaped bottom (14), wherein the device for inserting the bottom (14) from a larger opening of the conical sleeve (12) towards the smaller opening of the sleeve (14) 12) is formed in the sleeve (12), characterized by an annular cover sleeve (32) whose inner circumference is so large that a peripheral wall of the cup-shaped bottom (14) rests against the inner circumference, means for moving the cover sleeve (32) in and against a longitudinal direction of the sleeve (12) and means for retaining the Floor in a predefined relative position to the sleeve (12) with simultaneous withdrawal of the cover sleeve (32) between the inside of the sleeve (12) and the peripheral wall of the bottom (14). Apparatus according to claim 5, characterized by a punch (18) for holding the bottom (14), wherein the punch (18) an actuating rod (20) and a bottom (14) abutting punch surface (22), wherein the cover sleeve ( 32) is slidably disposed on the actuating rod (20) of the punch (18).

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