WO1999002408A1

WO1999002408A1 - Method and device for making a continuous web for a foldable packaging made of a sheet-type material

Info

Publication number: WO1999002408A1
Application number: PCT/EP1998/004080
Authority: WO
Inventors: Yves Delaunay; Edgar Schroyens; Marcus Moreno Horn; Eric Moreno Horn
Original assignee: Groupe Danone
Priority date: 1997-07-09
Filing date: 1998-07-02
Publication date: 1999-01-21
Also published as: DE59809773D1; DE19729270A1; AU8854898A; ATE251073T1; EP0890514A1; EP0890514B1; ES2209007T3

Abstract

The present invention relates to a method for making a continuous web for a foldable packaging made of a sheet-type material, wherein said web is made from two overlapping sheet portions which are connected together in the overlapping region. This method is characterised in that the two sheet portions are made from a single sheet which travels in the transport direction and is cut longitudinally. At least one sheet portion extends from the plane of the transport direction by pivoting about a first folding axis, wherein said folding axis defines a predetermined angle relative to the transport direction that does not exceed 90°. After travelling over a given deviation distance, the sheet portion returns into the plane of the transport direction by pivoting about a second folding axis which is parallel to the first one so that the longitudinal and overlapping edge areas form the overlapping region. The two longitudinal and overlapping edge areas are further connected together.

Description

DESCRIPTION

Process for producing a film web for a folded package from film-like material and device for carrying out the process

TECHNICAL AREA

The invention relates to a method for producing a film web for a folding pack, as is known for example as a flow pack. The folding pack consists of this film-like material. The invention also relates to an apparatus for performing this method.

A folding pack made from such a film web is used for packaging, for example, freeze-dried coffee, biscuits or other stimulants which are to be packed in an airtight and moisture-proof or aroma-tight manner.

STATE OF THE ART

From EP-A-0 340 629 it is known to fold and close a film web around a product to be packaged in such a way that the film web u closes the product airtight on all sides. The film web is composed of two web parts. The two web parts are rolled up on separate web rolls. The two web parts are pulled off these two web rolls and brought into an overlapped position. The two web parts are then connected to one another in their overlapped area. In this way, a single web is created from two individual webs. A folding pack made in this way has proven itself. So it can be opened easily, because only to open the overlapped longitudinal edge areas in the transverse direction must be separated from each other again. This can be easily accomplished by pulling the outer web part from the lower web part in the overlapped area. The production of this film web from two web parts, each of which is available wound on separate material rolls, places high demands on the required exact synchronization of the two web parts during their joining. The longitudinal tension in the two web parts must also be exactly the same. A pattern that is regularly present on the pack is made up of two sample parts that are present on the two web parts. In the assembled state of the two web parts, the sample parts must exactly match both in their absolute length and in the longitudinal direction of the web. A longitudinal offset between the two web parts and different longitudinal expansions in the web parts prevent a repeated, exactly the same pattern to be generated one after the other.

PRESENTATION OF THE INVENTION

On the basis of this prior art, the object of the invention is to specify a possibility with which the above disadvantages can be avoided and in particular to specify a film web for a folding pack in which a sample drawing is always exactly available.

This invention is given by the manufacturing method according to claim 1 and by the device according to claim 8. Useful further developments of the method or the device for carrying out the method are the subject of subclaims. The essence of the invention is that for the production of the film web for a folding pack of the type mentioned no longer two separate web parts are correspondingly processed and joined by two web rolls, but that these two web parts are produced from a single web by cutting the web and the Both parts of the web are then continued so that they then come to the desired overlapped position, in which they can then be joined together, such as glued together. If only one part of the web is diverted and the other part of the web is not redirected after the web has been cut open, a detour is available for the diverted web part. In the case of a repeating pattern, this detour route can be chosen so long that the relative length of the detour route of this part of the web to the other part of the web is an integral multiple of the length of a repeating pattern. This can ensure that repeated "correct" patterns can be created in the overlapped area of the web that run across the entire width of the web.

According to the invention, after being separated, both parts of the railway can also run through separate detours. In this way, a relative difference in length between the two web parts can be avoided, so that each time the same pattern is cut with the cutting of the web and can then be put together identically. The non-existent length offset includes a reduced material waste at the beginning and end of the roller conveyor, since both parts of the web are available for their further use without longitudinal offset at the beginning and end of the conveyor. According to one embodiment of the invention, a deflection of at least one of the two web parts is possible with at least two rollers which are aligned with one another with their axes of rotation. These axes of rotation are in particular arranged parallel to the plane of the track. A section of the web runs through a detour loop between the two rollers. It makes sense to arrange a third roller within the loop in order to ensure a continuously tensioned alignment of the web in its longitudinal direction. This third roller is also aligned with its axis of rotation according to an embodiment shown in the drawing parallel to the axes of rotation of the other two rollers.

In particular, if there is no third deflecting roller, the web must be actively driven before and after the detour.

The overlap width, that is to say the lateral offset of the two web parts to one another, and the mutual longitudinal offset of the two web parts can be changed by changing the angular position of the axes of rotation of the rollers in relation to the longitudinal direction of the web and by varying the length of the respective detour route. The length of the detour route can be changed, for example, in a simple manner in that the middle roller can assume different positions relative to the other two rollers. For example, the height of the middle roller can be arranged to be variable, that is to say adjustable in the transverse direction to the plane of the web. In addition, for example, all three rollers can be pivoted together in a plane parallel to the plane of the web, thereby changing their inclination to the longitudinal direction of the transport. A kind of knife can be directed against the web to cut the web. It is also possible to arrange a roller-shaped cutting edge. The roller-shaped cutting edge can be part of a roller roller lying against the web.

Further features and advantages of the invention can be found in the features further specified in the claims and in the exemplary embodiments below.

BRIEF DESCRIPTION OF THE DRAWING

The invention is described and explained in more detail below with reference to the exemplary embodiments shown in the drawing. Show it:

1 is a schematic perspective top view of the area of a film web in which the web is separated and brought into an overlapping position,

Fig. 2 is a side view of a device according to the

Invention in which two web parts are brought into an overlapped position from a single web,

3 shows a top view of the deflection station of the device according to FIG. 2, in which the overlap of the two web parts is produced,

4 shows a schematic drawing of the mode of operation of the deflection station contained in FIGS. 2 and 3 with three deflection rollers,

5 shows a representation similar to that of FIG. 4, but in which both web parts are deflected separately from one another, Fig. 6 is a schematic side view of the upper web part of the web of Fig. 5 and

FIG. 7 shows a schematic representation of the lower part of the web of FIG. 5.

WAYS OF CARRYING OUT THE INVENTION

A film web 10 runs in the transport direction 12, which runs in the longitudinal direction of the web 10, through a cutting station 14, a first drive station 16, an overlap station 18 and a subsequent second drive station 20.

In the cutting station 14, the web 10 is cut lengthwise, so that two web parts 22, 24 lying next to one another in parallel are formed.

The two web parts 22, 24 are driven by the first drive station 16 in the transport direction 12. For this purpose, a roller 26, 28 is in frictional contact with the two web parts 22, 24 from above and below. At least one of the two rollers 26, 28 is driven in a manner not shown.

In the overlap station 18, the two web parts 22, 24 are brought into a partially overlapped position. The left web part 22 in FIG. 1 is partially placed on the right web part 24. The right longitudinal edge 30 of the left web part 22 in FIG. 1 runs parallel to the left longitudinal edge 32 of the right web part 24. The two longitudinal edges 30, 32 are at a distance 33 from one another which represents the degree of overlap of the two web parts 22, 24. The overlap station 18 in the embodiment according to FIG. 1 consists of three deflecting rollers 34, 36, 38, the respective axes of rotation 40, 42, 44 of which are aligned parallel to one another and also by the same angle 46 in a plane parallel to the plane of the web 10 right-angled orientation are pivoted out.

The three deflection rollers 34, 36, 38 rest only on the left web part 22. Due to its position (angle 46) pivoted out of its transverse direction, the left web part 22 - in FIG. 1 - is displaced to the right by the amount of the distance 33.

Subsequent to the overlap station 18, the now overlapped two web parts 22, 24 are moved further in the transport direction 12 by the second drive station 20. For this purpose, the drive station 20 has an upper roller 26 and a lower roller 28, which functionally correspond to the rollers of the first drive station 16. The two web parts 22, 24 are held in constant longitudinal tension by the two drive stations 16, 20 and the deflection rollers 34, 36, 38 of the overlap station 18.

With a suitable length of the detour path 50 of the left web part 22 relative to the path of the undeflected right web part 24, it can be ensured that a repeating pattern on the undivided web 10, which extends across the web 10, after the cutting of the web 10 and the overlapping of the two web parts 22, 24 is again found on the two overlapped web parts in such a way that a pattern which is not offset in the longitudinal direction is produced. In the present case, the cutting station 14 has a cutting roller 52 which is mounted on a shaft 54 in a rotationally fixed manner. In the present case, two punch notches 56 are provided in the cutting roller 52, which are arranged circumferentially opposite one another and one of which is shown in FIG. 1. On the opposite side of the web 10 there is a counter roller 58 to the cutting roller 52. This counter roll 58 has two punch teeth 60 which are circumferentially opposite. When the shaft 54 and thus the cutting roller 52 are driven and the counter-roller 58 is driven at the same time, the punching teeth 60 and the punching notches 56 are arranged and shaped in such a way that they can interlock. When the cutting roller 52 and the counter roller 58 are rotated, the cutting roller 52 not only creates a longitudinal seam 62 in the web 10 along which the web 10 is separated, but lateral V-shaped cutting regions 63, 64 are simultaneously produced in the longitudinal seam . The longitudinal seam 62 thus has serrations (cutting areas) 63, 64 oriented to the left in FIG. 1. These serrations are repeated at certain intervals. The distances depend on the transport speed of the web 10 and the arrangement and alignment of the punch teeth 60 and the punch notches 56.

With a suitable deflection path 50, the two web parts 22, 24 can be positioned so that they are overlapped so that the two V-shaped cutting areas 63, 64, which in the overlapped state form an incision 64 in the left web part 22 and a projection 63 in the right web part 24, laterally offset, next to each other at a distance of 33 (overlap dimension). In the longitudinal direction of the two web parts 22, 24, that is to say in the transport direction 12, there is then no longitudinal offset between the incision 64 and the projection 63. The incisions 64 present in the left web part 22 enable a grip tab 65 to be formed in the edge region of the left web part 22. Pulling the grip tab 65 toward the left in FIG. 1 causes the grip tab to tear open transversely in the region of the incisions 64. As a result, a folding pack made from the film web 10 can easily be torn open, as is described in the aforementioned EP-A-0 340 629. The projections 63 present in the right-hand web part 24 are not visible from the outside in the folded pack and also do not interfere with the tear-open described above.

Following the drive station 20, there is an adhesive station in which the two web parts 22, 24 are connected to one another in the region of their overlap, for example by gluing or sealing, as is also mentioned by way of example in the aforementioned EP-A-0 340 629 .

A device 68 is shown schematically in FIG. 2, on which the film web 10 can be separated, overlapped and, for example, sealed in the overlapped area.

Two laterally projecting bracket arms 72, 74 are provided on a frame 70. There is a web roll 76 on the console arm 72 and a further web roll 76.2 on the other console arm 74. A film web 10 is wound onto each of the two web rolls 76, 76.2. The film web 10 is drawn off from each of these web rolls and brought into an overlapped position. Thus, from the web roll 76, the film web 10 is fed to the three deflection rollers 34, 36, 38 via deflection rollers 80, 82, 84, 86, 88, 90 are aligned with their respective axes of rotation parallel to one another, but are aligned pivoted by the same angle 46 (FIG. 1) from their transverse direction. The middle deflecting roller 36 can be adjusted (double arrow 94) up and down along a guide 92 in parallel. The

Guide 92 is formed in a plate 96 which is rotatably attached to the frame 70 with an angular foot 98. The axis of rotation 100 is perpendicular to the axes of rotation 40, 42, 44 of the three deflection rollers 34, 36, 38.

The cutting station 14, not shown in FIGS. 2, 3, produces the two web parts 22, 24 which are overlapped by the three deflecting rollers 34, 36, 38 with the device shown in FIGS. 2 and 3.

The three deflecting rollers 34, 36, 38 are held together in a holder 104 opposite their axis of rotation 100. The holder 104 can be pivoted about the axis of rotation 100 by a pendulum rod 106. The pendulum rod 106 can be fixed in its respective position by means of two screw parts 108, 110, so that the three deflecting rollers 34, 36, 38 are adjustable but fixed in their respective pivot position.

By varying the pivoting position of the deflection rollers 34, 36, 38 and the length of the deflection path 50 (FIG. 1), that is to say the vertical orientation of the middle deflection roller 36 relative to the other two deflection rollers 34, 38, the distance 33, that is the size of the overlap, and the length offset in the transport direction 12 between the two web parts 22, 24 set as desired. In the device according to FIG. 2, after the overlap, the desired fastening of the two web parts 22, 24 in the region of the overlap is produced with the aid of a sealing station 120 acting from above on the two web parts 22, 24 in the region of the overlap. Then the two interconnected web parts 22, 24 are then pulled off and fed to a packaging machine, not shown.

4 the diagram on which the overlap is based is shown schematically. With reference to the above explanations, the web 10 is cut lengthwise at point A. This can take place, for example, when the web 10 is moved in the transport direction 12 through the aforementioned cutting station 14. The two web parts 22, 24 are formed by the separation.

Instead of the three deflection rollers, the kink lines 34a, 36a and 38a corresponding to these deflection rollers are shown. The web part 22 is deflected around these fold lines in the same way as when corresponding deflection rollers 34, 36, 38 are arranged.

Due to the deflection around the three deflection rollers 34, 36, 38, the web part 22 experiences a longitudinal offset r with respect to the other web part 24, which is not deflected in the illustration according to FIG. 4. This longitudinal offset r is determined as follows. The non-deflected web part 24 has the dimension L between two transverse lines Rre (points A, C). This dimension is present between the points AC and in the same way between the points Are and Cre. At the web part 22, the point C moves to a point Cl. In the area of the overlap there is thus 12 in the longitudinal direction between point C and point C1 the longitudinal offset r is present. Accordingly, the transverse line Rli, which goes through the point A and represents an extension of the line Rre, no longer runs undisturbed over the two web parts 22, 24 in the overlapped area. The two transverse lines Rre and Rli are spaced apart from one another by the longitudinal offset r. If the transverse lines R represented a pattern, this pattern would be offset in the longitudinal direction in the overlapped area. By pivoting the fold line 34a (pivot angle 130) around the point A and pivoting the other fold lines 36a and 38a in parallel, Cl migrates in a slightly curved line (curved arrow 132). This changes the dimension of the overlap d (distance 33 in FIG. 1) and also the size of the longitudinal offset r.

By changing the distance L between the points A and C and thus, for example, by moving the point C or Cl in the direction of the point A, the point Cl comes into its position C2. The upper break point B1 of the web part 22 becomes B2. The point C2 has a greater longitudinal offset than the point Cl. In addition, the coverage dimension d2 is larger than the coverage dimension d.

The points Cl, C2 lie on a straight line gl (C Cn). The distance ACn corresponds to the distance AC. The straight line gl is perpendicular to the crease line 34 a. The same applies to the straight line g2 with regard to the points B, Bn.

While in the device according to FIGS. 2 and 3 a change in the length offset and the overlap is produced in that the three deflecting rollers can be pivoted differently and also the middle, upper deflecting roller can be adjusted in height, in FIG. 4 a variable degree of overlap and a variable one Along- offset produced in that the two "lower" deflection rollers, that is to say the deflection rollers responsible for the folding lines 34a and the folding line 38a, are variably arranged at a mutual distance. The detour distance of the web part 22 is kept constant, in contrast to the arrangement of FIG. 2, where the detour distance can be set larger or smaller by adjusting the height of the middle deflection roller 36.

5, a deflection of the two web parts 22.5 and 24.5 is present in a modification of the representation according to FIG. 4. This can ensure that there is no mutual longitudinal offset between the two web parts in the region of their overlap. While the upper web part 22.5 in FIG. 5 is deflected, as is shown, for example, in FIG. 4, the lower web part 24.5 in FIG. 5 is deflected by three deflection rollers 34.7, 36.7, 38.7 in the present example in such a way that a lateral offset does not occur occurs. For a given detour route 50 for the web part 22.5, the length of the detour route 51 for the web part can

24.5 can be enlarged or reduced as desired in a simple manner, for example by moving the middle deflecting roller 36.7 up or down. The adjustment of the U west corner 51 therefore has no influence on the size of the overlap but only on the longitudinal offset between the two web parts 22.5 and 24.5 in the overlapped area. In the case of a predetermined overlap, which occurs as a result of the deflection of the web part 22.5, a variation in the detour route 51 can be used to set and / or readjust a longitudinal offset in a simple manner in accordance with, for example, a predetermined pattern in the overlapped area.

Claims

EXPECTATIONS

01) Method for producing a film web for a folding pack of film-like material, in which the film web having a certain width is folded around a good to be packed and closed in such a way that it encloses the good airtight on all sides, using one of at least two web parts composite film web, which are aligned parallel to one another and which overlap with their respective one longitudinal edge regions and are connected to one another in the overlapped region, characterized in that - the two web parts are produced from a single web moving in the transport direction by the web being separated lengthways,

at least one web part is pivoted out of the plane of the transport direction about a first articulation axis, the articulation axis being oriented at a specific angle to the transport direction that is not 90 degrees,

this part of the web is swung back into the plane of the transport direction after passing through a detour, a second articulation axis being aligned parallel to the first articulation axis, so that the overlapping longitudinal edge areas result in the overlapping area,

- The two overlapping longitudinal edge areas are then connected to one another. 02) Method according to claim 1, characterized in that

- The relative length of the detour of one part of the track to the other part of the track is an integral multiple of the length of a pattern repeat that is identically repeated in the direction of transport, so that a pattern running across the web in the overlapped area of the web in the not yet longitudinally separated does not have any offset in the longitudinal direction the web, that is, in the transport direction of the web.

03) Method according to claim 2, d a d u r c h g e k e n n z e i c h n e t that

- Both parts of the track are swung away from the transport direction in a respective detour section and swiveled back into the transport direction in such a way that the length difference between the two detour sections is an integral multiple - also a zero multiple - of the length of the pattern repeat, which is identical in the transport direction is.

04) Method according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that

- The first and second articulation axes are aligned parallel to the plane of the web.

05) Method according to claim 4, d a d u r c h g e k e n n z e i c h n e t that

- At least a third articulation axis is arranged along the detour route of the web part. 06) Method according to claim 5, characterized in that - the third articulation axis is aligned parallel to the first and second articulation axes.

07) Method according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that

- In the area before the at least one detour route, the undivided path and in the area after the detour route, the two overlapped path parts are each driven in the transport direction.

08) Device for performing the method according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that

a first drive station (16) for the full width web (10) is present,

- a second drive station (20) is provided for the overlapped area (22, 24), - an overlap station (18) with several deflecting rollers (34, 36, 38) is provided for the laterally offset longitudinal alignment of the at least one web part (22),

- A cutting station (14) for cutting the web (10) before the overlap station (18) is available.

09) Device according to claim 8, d a d u r c h g e k e n n z e i c h n e t that

- The cutting station (14) before the first drive station (16) is present.

10) Device according to claim 8 or 9, d a d u r c h g e k e n n z e i c h n e t that

- The cutting station (14) has a cutting edge (52) rolling along the path (10). 11) Device according to claim 10, characterized in that

- The cutting station (14) has a roller-shaped cutting edge (52) with counter-roller (58), - At least one in the roller-shaped cutting edge (52)

Punching notch (56) and a punching tooth (60) respectively adapted to the punching notch are provided in such a way that when the web (10) is moved between the two rolls (52, 58) through the punching notch (56) and the punching tooth ( 60) a spike (63, 64) can be cut together from the web (10).

12) Device according to one of claims 8 to 11, so that the cutting station (14), in particular the rolling cutting edge, can be moved away from the web (10) and towards the web (10).

13) Device according to one of claims 10 to 12, d a d u r c h g e k e n n z e i c h n e t that

- The cutting edge (52) rolling on the web (10) can be driven as desired.

14) Device according to one of the preceding claims, d a d u r c h g e k e n n z e i c h n e t that

- The overlap station (18) has three deflection rollers (34, 36, 38),

- The position of at least one roller (36) is adjustable relative to the positions of the other rollers (34, 38), - between the axes of rotation of all rollers (34, 36, 38) and the longitudinal direction (12) of the web (10) there is an equally large angle (46),

- This angle (46) can be changed. 15) Device according to claim 14, characterized in that

- the three rollers (34, 36, 38) are mounted on an arm (96), - the arm is pivotally mounted (axis 100) on a support (98),

- An adjusting device (92) for the middle roller (36) on the arm (96) is present so that the middle

Roller (36) is adjustable relative to the other two rollers (34, 38).