CN213083569U

CN213083569U - Device for forming triangular folding surface of package

Info

Publication number: CN213083569U
Application number: CN202022219729.1U
Authority: CN
Inventors: 瑞内·艾伦; 马库斯·科曼德尔; 斯蒂芬·佩尔泽
Original assignee: Kangmeibao Suzhou Co ltd
Current assignee: Kangmeibao Suzhou Co ltd; SIG Combibloc Suzhou Ltd
Priority date: 2020-08-21
Filing date: 2020-09-30
Publication date: 2021-04-30
Anticipated expiration: 2030-09-30
Also published as: DE102020121953A1; CN114074770A

Abstract

The utility model relates to a device for forming triangular folded surfaces of package, include: at least one first presser for pressing an ear onto a first side of the package, at least one second presser for pressing an ear onto a second side of the package, and at least one drive for moving the pressers, wherein the first and second pressers each have a pressing face for pressing an ear onto the package, wherein the first and second pressers are arranged such that a delta-folded region of the package is positioned between the first and second pressers, and the first and second pressers are supported in such a way that the distance between the two can be reduced and increased. In order to achieve a reliable abutment of the ear in a packaging made of a very elastic material without damaging the packaging, the pressing surfaces of the first presser and the second presser are asymmetrically shaped relative to a plane extending perpendicularly through the two pressers.

Description

Device for forming triangular folding surface of package

Technical Field

The utility model relates to a device for forming triangular folded surface of package, the device includes: at least one first presser for pressing an ear onto a first side of the package, at least one second presser for pressing an ear onto a second side of the package, and at least one drive for moving the pressers, wherein the first and second pressers each have a pressing face for pressing an ear onto the package, wherein the first and second pressers are arranged such that a gusset area of the package can be positioned between the first and second pressers, and the first and second pressers are supported in such a way that the distance between the two pressers can be reduced and increased.

Background

The package can be manufactured in different ways and from different materials. A widely used manufacturing solution consists in making a blank with usual folding lines (also called "crease lines") from the packaging material, from which blank, through folding and other steps, a package outer cover is first made and finally a package is made. This solution has the advantage, in particular, that the blanks are very flat and can thus be stacked in a space-saving manner. In this way, the blank or the wrapper can be manufactured at another location than the folding and filling of the wrapper takes place. As material, composite materials are generally used, for example composites consisting of a plurality of thin layers made of paper, cardboard, plastic or metal, in particular aluminum. Packages of this type are in particular widely used in the food industry.

Folding of the pack outer cover in the bottom region and in the gusset region presents particular challenges, since the pack outer cover must be hermetically closed in these regions, for which purpose the material must be folded several times. For this purpose, different folding schemes are known: on the one hand, the area of the package outer cover can be folded inwards; this is preferably done in the bottom area to achieve as flat a package underside as possible. On the other hand, it is possible to fold the region of the pack casing outwards, whereby an outwardly projecting "ear" is created from the excess material, which is then pressed against the side of the pack and fixed there; this is preferably done in the delta fold region.

Typically, the "ears" are brought against the package by heating and pressing the ears. The purpose of the heating, for example by hot air, is to heat ("activate") the outer plastic layer of the package in the region of the ears, so that the outer plastic layer becomes tacky and can exert a gluing effect. The pressing of the ears on the side of the package can be carried out, for example, by two oppositely arranged pressers of the delta-fold forming station, which press the ears on the side of the package until a sufficiently strong adhesive connection is produced.

The ear portions must be pressed onto the side of the package with sufficient force to produce a reliable adhesive connection. For example, in packages whose composite material is very elastic, a higher pressing force is required, as a result of which the ear tends to "spring back" after pressing. Such as a composite material without an aluminium layer, for example for a package suitable for a microwave oven. However, an excessively high pressing force may deform or damage the package and should therefore be avoided.

A device for forming the triangular folding faces of a package (including its "ears") is known, for example, from DE 102016109980 a 1. However, the device described herein relates to the particular case of packages having an inclined delta fold.

Another device for bringing "ears" close to the package is known from EP 0061332 a 2. The folding means used here, such as a bar and a pressure plate, extend over the entire face of the ear, to be precise over the entire side of the package, and therefore do not allow precise control of the forces acting on the ear. This increases the risk of impermissibly high forces in several regions of the ear, for example in regions which project further away (for example folding edges or seams).

SUMMERY OF THE UTILITY MODEL

Against this background, it is an object of the present invention to provide a device with which a reliable ear contact can also be achieved without damaging the packaging when the packaging is made of a very elastic material.

In the device according to the invention, this object is achieved in that the pressing surfaces of the first presser and of the second presser are asymmetrically shaped with respect to a plane extending perpendicularly through the two pressers. This vertical plane is shown in the figures as the X-Y plane.

The present invention relates to a device for forming the gusset of a package, in particular a package made of a composite material consisting of a plurality of layers of paper/cardboard and plastic. The formation of the triangular fold is understood in particular to mean that projecting ears are produced in the region of the triangular fold. The device can in principle also be used in packages in which projecting ears are also present in other regions, for example in the region of the base surface. The device comprises at least one first presser for pressing an ear (e.g. on the right) against a first (e.g. on the right) side of the package. Furthermore, the device comprises at least one second presser for pressing the (e.g. left) ear on a second (e.g. left) side of the package. Furthermore, the device comprises at least one drive for moving the presser; however, the device preferably comprises at least two separate drives, so that the left-hand presser and the right-hand presser can be driven independently of one another by one drive each and can be pressed onto the package on both sides. However, when two or more driving portions are provided, synchronization of the driving is also preferable. The first presser and the second presser each have a pressing surface for pressing the ear portion to the package. A press face is understood to be the part of the surface of the presser intended to come into contact with the package when pressing the ear. Since the size of the contact surface between the presser and the package is also related to the size of the pressing force depending on the elasticity of the package, the pressing surface is the area that comes into contact with the package when the maximum pressing force occurs during operation. Since the force is transmitted to the package (only) through this part of the surface of the presser, special requirements are placed on the shape of this part. The first and second pressers are arranged such that a delta fold region of the package is positionable between the first and second pressers. Between the two pressers associated with one another (i.e. between the "pair" of pressers) there is accordingly a distance which allows the package to be arranged between the two pressers, to be precise inserted into the gap and moved out of the gap again without collision. Finally, the first presser and the second presser are supported in such a way that the distance between the two pressers can be reduced and increased, so that the ear can be pressed onto the package and the package can be released again after pressing. The prerequisite is, of course, that in the case of a "pair" of pressing devices, at least one of the two pressing devices is mounted so as to be movable in the direction of the other pressing device and back; preferably, two or all of the pressers can be movably supported in this way.

According to the invention, the pressing surface of the first presser and the pressing surface of the second presser are asymmetrically shaped relative to a plane extending perpendicularly through the two pressers. The pressing surfaces should be asymmetrically shaped with respect to a vertical plane extending through the two pressers, i.e. transversely to the conveying direction of the packages. In the figure, the vertical plane is shown in the X-Y plane. In the known devices, pressers with symmetrical pressing surfaces are used, or even entirely symmetrical pressers are used, which simplifies the manufacture and moreover enables the use of identically shaped pressers on both sides of the package (i.e. there is no distinction between "left-hand" and "right-hand" pressers). In contrast, the "left-hand" presser differs from the "right-hand" presser in pressers with asymmetrical pressing surfaces, so that two different types of pressers are required (although the left-hand and right-hand pressers are preferably mirror-symmetrical with respect to a vertical plane which extends in the transport direction of the package, i.e. does not extend through the pressers, but is arranged "between" the two pressers). The additional costs incurred by manufacturing different pressers have hitherto prevented the use of this type of pressers. However, it is known that asymmetrical pressing surfaces have significant advantages, in particular they allow a better matching of the pressing surface to a side of the package associated with the pressing surface, which side is usually not identical to another side of the package. For example, the separate adaptation of the pressing surfaces has the advantage that the pressing surfaces can be adapted precisely to the position of the ears and their edges and to the position of the seams of the packaging, as a result of which damage to the packaging can also be avoided in the case of high pressing forces.

According to one embodiment of the device, it is provided that the pressing surface has an apex angle with respect to the vertical plane, which apex angle is preferably in the range from 15 ° to 30 °. The vertical plane is also understood to be a plane which extends transversely to the conveying direction of the pack, i.e. extends through the two pressers and the two ears of the pack. The pressing surface (in particular the edge of the pressing surface) does not extend parallel to this plane, but is inclined relative to this plane. If the apex angle has different values due to the complex shape of the pressing surface, the maximum value, i.e., the maximum angle that occurs, should always be referred to. This inclination makes it possible to narrow the presser in the direction of its tip. This narrowing is achieved in that at least one edge of the ear of the packaging is no longer controlled by the pressing surface of the presser and is thus located outside the contact surface. This significantly reduces the load on the package.

According to another embodiment of the device, it is provided that the tip of the presser has an apex angle with respect to the vertical plane, the apex angle preferably being in the range of 40 ° to 50 °. Here, a vertical plane denotes a plane extending transversely to the conveying direction of the packs, i.e. a plane extending through the two pressers and the two ears of the packs. The tip of the presser, in particular the edge of the presser, does not extend parallel to this plane, but is inclined with respect to this plane. If the apex angle has different values due to the complex shape of the presser, it should always refer to the maximum value, i.e. the maximum angle that occurs. By this inclination, the presser narrows in the direction of its tip, whereby the pressing surface can also be formed accordingly. This has the advantage of reducing the load on the package as already described above.

In a further embodiment of the device, it is provided that the apex angle of the pressing surface and/or the apex angle of the tip of the presser is provided only on one side of the presser. The asymmetry of the pressing surface described above can be achieved in a structurally simple manner by providing a vertex angle only on one side, i.e. an inclination with respect to a vertical plane only on one side. It can be provided that in two pressers associated with one another, to be precise in their pressing faces, an inclination is provided on the same side (for example on the side shown in the conveying direction). A one-sided matching of the shape is often sufficient or even advantageous, since the ears of the package are often not symmetrical with respect to a vertical plane (e.g. the fin seam in the region of the ear is folded to one side).

According to a further embodiment of the device, it is provided that the pressing surface has a slope angle relative to the horizontal plane, which slope angle is preferably in the range from 70 ° to 80 °, and that a slope is provided adjacent to the pressing surface, which slope angle is smaller than the slope angle of the pressing surface and is preferably in the range from 40 ° to 50 °. In other words, the pressing surface extending more steeply, with respect to the same plane, should transition into a sloping surface extending more gently, wherein the pressing surface is arranged closer to the tip of the presser than the sloping surface. The gentle slope contour compared to the pressing surface results in that, when the ear is pressed against the pressing surface, the packaging is at most contacted by the region of the slope directly adjoining the pressing surface, but preferably only by the pressing surface. This has the effect that the load on the long side of the ear, i.e. the upper side of the package, is reduced when pressing the ear, because the pressing force acts on the package further away from the side. If the inclination angle has different values due to the complex shape of the pressing surface or the inclined surface, the maximum value, i.e., the maximum angle that occurs, is always to be understood.

According to a further embodiment of the device, it is provided that the pressing surface has a width in the range from 5mm to 15 mm. Alternatively or additionally, it is provided that the presser has a width in the range of 12mm to 25 mm. By means of the large width of the pressing surface, a larger contact surface and thus a smaller pressing force are achieved. Furthermore, by the width of the pressing surface being only slightly smaller than the width of the presser, it is achieved that the presser is in contact with the package only via its pressing surface and not via other areas, which reduces the risk of damage to the package.

A further embodiment of the device is characterized by a first beam and a second beam, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam. To this end, it is further proposed that the first transverse beam is connected to the first drive part and the second transverse beam is connected to the second drive part. A transverse beam extending in the transverse direction (i.e. transversely to the conveying direction) can be used to move two or more pressers simultaneously by means of a single drive and thus to process more packages simultaneously. This allows a plurality of rows of packages (for example on a conveyor belt) arranged side by side to be processed, for example four rows (four first pressers and four second pressers per crossbar) or six rows (six first pressers and six second pressers per crossbar). In this case, all first pressers (for example, the right-hand side) are connected to one crossbar and all second pressers (for example, the left-hand side) are connected to the other crossbar, so that all first pressers (for example, the right-hand side) can be moved synchronously and all second pressers (for example, the left-hand side) can be moved synchronously. The two beams can even move independently of each other if they are each connected to an "own" drive. However, synchronization of the drive of the two transverse beams is preferred.

Drawings

The invention is explained in detail below on the basis of the accompanying drawings which show only preferred exemplary embodiments, wherein:

fig. 1 shows a detail of a device for forming a gusset of a package known from the prior art;

fig. 2 shows a schematic view of the contact surface of the presser of the device shown in fig. 1 on the side of the package;

figure 3 shows a part of an apparatus for forming a delta fold of a package according to the invention;

fig. 4A shows in perspective view the presser of the device shown in fig. 3;

FIG. 4B shows the depressor of FIG. 4A in a front view;

FIG. 4C shows the depressor of FIG. 4A in a top view; and

FIG. 4D shows the depressor of FIG. 4A in a side view from the right side;

fig. 5 shows a schematic view of the contact surface of the presser shown in fig. 3 to 4D on the side of the package; and

fig. 6 shows in a front view two pressers according to the invention when pressing the ears of a package.

Detailed Description

Fig. 1 shows a device 1 for forming a gusset of a package 2 known from the prior art. Since this type of device 1 can be used in particular for forming the gusset area 3 of the package 2, it is also referred to as "gusset forming station". The device 1 shown in fig. 1 has first of all two drives 4, 4', which have, for example, hydraulic or pneumatic cylinders. The drives 4, 4' can perform a linear, reciprocating movement, which is schematically illustrated in fig. 1 by straight double arrows.

The first drive portion 4 is rotatably connected to a first end portion of a first crank 5 rotatably supported about an axis a by a joint G. In a corresponding manner, the second drive 4 'is rotatably connected by means of a joint G' to a first end of a second crank 5 'rotatably supported about an axis a'. The first crank 5 is connected with its second end to a first beam 6A by means of a further joint G, and at least one first presser 7A is fixed to the first beam 6A. In a corresponding manner, the second crank 5 'is connected with its second end via a further connection G' to the second beam 6B, and the at least one second presser 7B is fixed to the second beam 6B. In fig. 1, the first beam 6A and the second beam 6B are only partially shown; the length of the two

transverse beams

6A, 6B can be adapted to the number of packages to be processed simultaneously and to the

pressers

7A, 7B required for this purpose.

The two cranks 5, 5 'convert the linear movement of the two drive parts 4, 4' into a rotational movement (illustrated in fig. 1 by a curved double arrow) which is transmitted to the first cross member 6A and to the second cross member 6B. However, the two

cross beams

6A, 6B do not perform a complete rotational movement due to the two side supports of the two

cross beams

6A, 6B; instead, the cross beams 6A, 6B move along a part of a circular trajectory, wherein the cross beams are always kept horizontal.

Furthermore, a first rocker arm 8 is provided, which first rocker arm 8 is mounted in such a way that its first end is rotatable about the axis a and can be moved in rotation (illustrated in fig. 1 by a curved double arrow). The first rocker arm 8 is connected with its second end to the second cross member 6B via a joint G. Furthermore, a second rocker arm 8 ' is provided, which second rocker arm 8 ' is mounted in such a way that its first end is rotatable about an axis a ' and is likewise rotatable (illustrated in fig. 1 by a curved double arrow). The second rocker arm 8 'is connected with its second end to the first cross member 6A via a joint G'.

The first cross member 6A and the second cross member 6B extend substantially parallel to each other (shown in fig. 1 in a front-rear direction, so that the second cross member 6B is largely blocked by the first cross member 6A). In contrast to the two cranks 5, 5 ', the two rocker arms 8, 8' are not connected to the drive 4, 4 'shown in fig. 1, so that each of the two

transverse members

6A, 6B can be driven on one side (by the drive 4, 4' and the cranks 5, 5 ') and can be mounted movably on the opposite side (by the rocker arms 8, 8'). The support and drive of the two

transverse beams

6A, 6B are therefore implemented identically (although in mirror symmetry).

Between the first presser 7A of the first beam 6A and the second presser 7B of the second beam 6B, the pack 2 to be processed is arranged, so that the two

pressers

7A, 7B, which are associated with one another and arranged opposite one another, can contact the pack 2 in the region of the delta-fold region 3. In particular, the pressing means 7A, 7B are intended to press the ears 9 present in the gusset area 3 against the side of the pack 2. The packs 2 are fed to the device 1 (preferably in a cyclical manner) and are transported out after the ears 9 have been brought into contact, for example by means of a conveyor belt or chain with a grid for placing the packs 2.

Fig. 2 shows a schematic view of the contact surface K of the

pressers

7A, 7B of the device 1 shown in fig. 1 on the side of the packaging 2. It can be seen that the ear 9 lying against the triangular fold area 3 of the package 2 has an approximately triangular shape with one long side 10A and two

short sides

10B, 10C. The long side 10A of the ear 9 forms one of the upper sides of the package 2; instead, the two

short sides

10B, 10C of the ear 9 are brought to lie against the sides of the package 2. Furthermore, a seam 11 can be seen in the region of the ear 9. As can be seen from this illustration, the contact surface K (i.e. the region in which the

pressers

7A, 7B contact the package 2) extends not only over the seam 11 but also over one of the short sides 10B. As a result, there is a risk of damage to the ear 9 at high pressing forces, in particular in the region of the short side 10B.

Fig. 3 shows a detail of a device 1' according to the invention for forming a gusset of a package 2. The regions of the device 1' which have already been described in fig. 1 are also provided with corresponding reference numerals in fig. 3. An important difference between the device 1 shown in fig. 1 and the device 1 'shown in fig. 3 is that the device 1' in fig. 3 is equipped with modified

pressers

12A, 12B. Next, the

pressers

12A, 12B used in the apparatus 1' are described in more detail. In fig. 3, a cartesian coordinate system is shown for reasons of better orientation. The X axis extends horizontally and transversely with respect to the conveying direction of the packs 2, i.e. from one ear 9 of a pack 2 to the other ear 9 of a pack 2 and thus parallel to the two

cross beams

6A, 6B. The Y axis extends vertically, so that the delta fold area 3 of the erected package 2 is shown in the direction of the Y axis. The Z axis is perpendicular to the X and Y axes and extends in the conveying direction of packages 2, i.e. parallel to axis A, A'.

Fig. 4A shows in a perspective view the presser 12B of the device 1' shown in fig. 3; fig. 4B shows the presser 12B in fig. 4A in a front view; fig. 4C shows the presser in fig. 4A in a top view, and fig. 4D shows the presser in fig. 4A from the right side in a side view. Although only the second presser 12B is shown in fig. 4A to 4D for better visibility, the description thereof also applies to the corresponding first presser 12A which is designed mirror-symmetrically. Furthermore, a cartesian coordinate system oriented with reference to the coordinate system of fig. 3 is shown. The presser 12B has a hole 13 extending in the direction of the Z axis at one end thereof, with which the presser 12B can be fixed to the cross beam 6B associated therewith. The presser 12B has a pressing surface 14 at the other end thereof, and the pressing surface 14 is a surface that contacts the package 2 when the ear portion 9 is pressed. The presser 12B has a slope 15 adjacent to the pressing surface 14, and the slope 15 is a surface inclined with respect to the pressing surface 14.

The shapes of the pressing surface 14 and the inclined surface 15 of the presser 12B are explained in detail below: the pressing surface 14 has a width W in the direction of the Z axis, which is only slightly narrower than the width W' of the entire presser 12B, whereby a pressing surface 14 as large as possible is realized. At a given pressing force, a reduced pressure results. Preferably, the width W of the pressing surface 14 is in the range of 5mm to 15 mm. Preferably, the width W' of the presser 12B is in the range of 12mm to 25 mm. Width W, W' is particularly clearly visible in fig. 4C.

Furthermore, the pressing surface 14 has a slope angle α with respect to a horizontal plane (e.g., developed through the X-axis and the Z-axis)₂. Furthermore, the inclined plane 15 has an angle of inclination α with respect to the same horizontal plane₂'. Slope angle alpha of the inclined plane 15₂' inclination angle alpha with pressing surface 14₂In contrast, the inclined surface 15 extends "more slowly", i.e. more than the adjacent pressing surface 14 which extends "more steeply". The more gradual extension of the bevel 15 results in that the package 2 is at most contacted by the area of the bevel 15 directly adjoining the pressing surface 14 when the pressing surface 14 presses the ear 9, but preferably not even at all contacted by the bevel 15. This has the effect of reducing the load on the long side 10A of the ear 9 (i.e. the upper side of the package 2) when pressing the ear 9 (see fig. 6). Preferably, the slope angle α of the pressing surface 14₂In the range of 70 ° to 80 °, the angle of inclination α of the inclined plane 15₂' is preferably in the range of 40 ° to 50 °. As can be seen particularly clearly in fig. 4BAngle of inclination alpha₂、α₂’。

Furthermore, the pressing surface 14 has an apex angle α with respect to a vertical plane (e.g., developed by the X-axis and the Y-axis)₁. Compared with the conventional presser, the vertex angle alpha₁This results in a considerable narrowing of the pressing surface 14 in the direction of its tip. Preferably, the pressing surface 14 has an increased apex angle only on one side, thereby resulting in an asymmetrical shape of the pressing surface 14. The entire tip of the presser 12B has an increased apex angle α on one side with respect to a vertical plane (e.g., developed by the X-axis and the Y-axis) in addition to the pressing surface 14₁'. As a result of the shape of the (asymmetrical and narrowing) pressing surface 14 realized in this way, the loading of the short side 10B of the lug 9 is significantly reduced, since the short side 10B (in contrast to fig. 2) is no longer controlled by the pressing surface 14 of the presser 12B and is thus located outside the contact surface K (see fig. 5). Vertex angle α of pressing surface 14₁Preferably in the range of 15 ° to 30 °. Vertex angle alpha of presser 12B₁' is preferably in the range of 40 ° to 50 °. The two apex angles α can be seen particularly clearly in fig. 4D₁、α₁’。

Fig. 5 shows a schematic view of the contact surface K' of the presser 12B shown in fig. 3 to 4D on the side of the packaging 2. The regions already described above are also provided with corresponding reference numerals in fig. 5. The main difference is that the contact surface K' no longer extends over the short side 10B due to its asymmetrical and narrowing shape on one side. Another difference is that the contact surface K' has another distance relative to the long side 10A of the package 2. By the above-described optimum design of the pressing surface 14 and the oblique surface 15 adjoining it, a better shape of the contact surface K' is achieved. Therefore, when the pressing force is large, there is no fear that the ear portions 9 are damaged in the regions of the long side 10A and the short side 10B.

Finally, fig. 6 shows in a front view two

pressers

12A, 12B according to the invention when pressing the ears 9 of the package 2. In this figure, the areas already described above are also provided with corresponding reference numerals. It can clearly be seen that pressing the ears 9 onto the package 2 by means of the

pressers

12A, 12B results in a press-in depth 16 in the range of 4mm to 10 mm. During pressing, the

pressers

12A, 12B contact the pack 2 with their pressing surfaces 14, while the inclined surface 15, due to its more gradual profile, contacts the pack 2 only in the region where it directly adjoins the pressing surface 14. Thus, by means of the more gradual profile of the ramp 15, the action on the package 2 is not exerted as tightly at the upper edge of the package 2 as in the case of a steeper profile of the ramp 15.

List of reference numerals

1. 1' device for forming the gusset of a package (the "gusset forming station")

2 packaging piece

3 (of package 2) triangular fold area

4. 4' first driving part and second driving part

5. 5' first crank, second crank

6A, 6B first crossbeam, second crossbeam

7A, 7B first presser and second presser

8. 8' first rocker arm and second rocker arm

9 ear

10A, 10B, 10C (of the ear 9)

11 seam

12A, 12B first presser and second presser

13 holes

14 pressing surface

15 inclined plane

16 depth of penetration

α₁、α₁' Top Angle

α₂、α₂' gradient angle

A. Axis A

G. G' joint

K. K' contact surface

W, W' width

Claims

1. An apparatus for forming a gusset of a package, the apparatus comprising:

at least one first presser for pressing an ear onto a first side of a package,

-at least one second presser for pressing an ear onto a second side of the package, and

-at least one drive for moving the presser,

-wherein the first presser and the second presser each have a pressing face for pressing the ear onto the package,

-wherein the first presser and the second presser are arranged such that a delta fold region of the package is positionable between the first presser and the second presser, and

-wherein the first presser and the second presser are supported in such a way that the distance between both pressers can be reduced and increased,

it is characterized in that the preparation method is characterized in that,

the pressing surfaces of the first presser and the second presser are asymmetrically shaped with respect to a plane extending perpendicularly through both pressers.

2. The device of claim 1, wherein the pressing surface has an apex angle relative to a vertical plane, the apex angle being in a range of 15 ° to 30 °.

3. The device of claim 1, wherein the tip of the depressor has a tip angle relative to a vertical plane, the tip angle of the depressor tip being in the range of 40 ° to 50 °.

4. The device of claim 2, wherein the tip of the depressor has a tip angle relative to a vertical plane, the tip angle of the depressor tip being in the range of 40 ° to 50 °.

5. The apparatus of claim 2, wherein a vertex angle of the pressing surface and/or a vertex angle of a tip of the presser is provided only on one side of the presser.

6. A device according to claim 3, characterized in that the apex angle of the pressing surface and/or the apex angle of the tip of the presser is provided only on one side of the presser.

7. A device according to claim 4, characterized in that the apex angle of the pressing surface and/or the apex angle of the tip of the presser is provided only on one side of the presser.

8. The device according to any one of claims 1 to 7, characterized in that the pressing surface has a slope angle with respect to a horizontal plane, the slope angle being in the range of 70 ° to 80 °, and a slope surface is provided adjacent to the pressing surface, the slope angle of the slope surface being smaller than the slope angle of the pressing surface, the slope angle of the slope surface being in the range of 40 ° to 50 °.

9. The device according to any one of claims 1 to 7, characterized in that the pressing surface has a width in the range of 5mm to 15 mm.

10. The device of claim 8, wherein the pressing surface has a width in a range of 5mm to 15 mm.

11. The device according to any one of claims 1 to 7, characterized in that the presser has a width in the range of 12mm to 25 mm.

12. The device according to claim 8, characterized in that the presser has a width in the range of 12mm to 25 mm.

13. The device according to claim 9, characterized in that the presser has a width in the range of 12mm to 25 mm.

14. The device according to claim 10, characterized in that the presser has a width in the range of 12mm to 25 mm.

15. Device according to one of claims 1 to 7, characterized in that a first crossbar and a second crossbar are provided, at least two first pressers being fixed on the first crossbar and at least two second pressers being fixed on the second crossbar.

16. Device according to claim 8, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

17. Device according to claim 9, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

18. Device according to claim 10, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

19. Device according to claim 11, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

20. Device according to claim 12, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

21. Device according to claim 13, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

22. Device according to claim 14, characterized in that a first beam and a second beam are provided, at least two first pressers being fixed on the first beam and at least two second pressers being fixed on the second beam.

23. The device of claim 15, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

24. The device of claim 16, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

25. The device of claim 17, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

26. The device of claim 18, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

27. The device of claim 19, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

28. The device of claim 20, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

29. The device of claim 21, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.

30. The device of claim 22, wherein the first beam is connected to a first drive section and the second beam is connected to a second drive section.