U.S. patent application number 11/727490 was filed with the patent office on 2007-10-04 for method and device for the manufacture of perforated films or foils.
This patent application is currently assigned to Groz-Beckert KG. Invention is credited to Hans-Joachim Halamoda.
Application Number | 20070227217 11/727490 |
Document ID | / |
Family ID | 36699203 |
Filed Date | 2007-10-04 |
United States Patent
Application |
20070227217 |
Kind Code |
A1 |
Halamoda; Hans-Joachim |
October 4, 2007 |
Method and device for the manufacture of perforated films or
foils
Abstract
A device for the manufacture of perforated films or foils
comprises a means (5) for the perforation of the film or foil (2),
as well as a means (19) for crimping the edges of the thusly
produced holes. By crimping the edges, the holes are fixed after
having been opened. Punching tools for cutting the perforation out
of the film or foil are not required. Rather, the desired hole is
first created as a puncture, or as a cut, and is then widened.
During the crimping operation, the material bent out of the plane
of the film or foil is fixed in place in such a manner that it will
not close the pierced hole again.
Inventors: |
Halamoda; Hans-Joachim;
(Albstadt, DE) |
Correspondence
Address: |
FITCH, EVEN, TABIN & FLANNERY
P. O. BOX 18415
WASHINGTON
DC
20036
US
|
Assignee: |
Groz-Beckert KG
Albstadt
DE
|
Family ID: |
36699203 |
Appl. No.: |
11/727490 |
Filed: |
March 27, 2007 |
Current U.S.
Class: |
72/71 ; 29/827;
29/829; 29/852; 72/325 |
Current CPC
Class: |
Y10T 29/49165 20150115;
B26D 7/20 20130101; B26F 2001/4427 20130101; B26D 7/02 20130101;
B26F 1/24 20130101; Y10T 29/49121 20150115; Y10T 29/49124
20150115 |
Class at
Publication: |
072/071 ;
029/852; 029/827; 029/829; 072/325 |
International
Class: |
B21C 37/29 20060101
B21C037/29; B21D 31/02 20060101 B21D031/02 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 29, 2006 |
EP |
06 006 503.4 |
Claims
1. Method for the manufacture of perforated films or foils (2),
whereby holes (25) are first produced in the film or foil (2), and
whereby the edges (27) of the resultant holes (25) in the film or
foil (2) are crimped.
2. Method in accordance with claim 1, characterized in that the
holes (25) are produced with needle-like tools (14).
3. Method in accordance with claim 1, characterized in that the
film or foil (2) is guided between two clamping elements (6, 9) and
is clamped between said elements in order to be pierced.
4. Method in accordance with claim 1, characterized in that, in
order to produce the holes (25), pierced holes are first produced,
and that said holes are subsequently widened.
5. Method in accordance with claim 1, characterized in that, while
crimping the edges (27) of the holes (25), material present on the
film or foil (2) is folded and pressed against said film or
foil.
6. Device for the perforation of films or foils (2), comprising a
means (5) for producing holes in the film or foil (2), and a means
(19) for crimping the edges (27) of the produced holes (25).
7. Device in accordance with claim 6, characterized in that the
device comprises a means (7) for supporting the film or foil (2)
during the piercing operation.
8. Device in accordance with claim 6, characterized in that the
means (5) for piercing the film or foil (2) is a tool (14) having a
longitudinal working part (16) with a tip (18), whereby the
cross-section of the working part (16) enlarges extending from said
tip.
9. Device in accordance with claim 8, characterized in that the
working part (16) is configured as a needle.
10. Device in accordance with claim 8, characterized in that the
tip (18) is a punctiform tip.
11. Device in accordance with claim 8, characterized in that the
tip (18) is configured as a cutting edge.
12. Device in accordance with claim 8, characterized in that the
working part (16) has a circular cross-section.
13. Device in accordance with claim 8, characterized in that the
working part (16) has a knife-type cross-section.
14. Device in accordance with claim 8, characterized in that
working part (16) has a polygonal cross-section.
15. Device in accordance with claim 8, characterized in that the
working part (16) has a section with a constant cross-section.
16. Device in accordance with claim 8, characterized in that the
means for supporting the film or foil (2) has a support surface (7)
which is provided with openings (11) that are associated with the
tool (14) for producing the holes (25).
17. Device in accordance with claim 16, characterized in that each
of the openings (11) has a diameter which is greater than the
diameter of the working part (16) associated with the opening
(11).
18. Device in accordance with claim 6, characterized in that the
means (19) for crimping the edges (27) of the holes (25) comprises
a first element (20) with a pressure surface (22) facing the
underside of the film or foil (2) and comprises a second element
(21) with a pressure surface (23) facing the upper side of the film
or foil (2), and further comprises a drive means for moving the two
elements (20, 21) in a controlled manner toward each other and away
from each other.
19. Device in accordance with claim 6, characterized in that the
film or foil (2) is associated with a transport device (4) in order
to intermittently move the film or foil through the device (1).
20. Method for the manufacture of perforated films or foils (2),
whereby holes (25) are first produced in the film or foil (2) by
means of a tool (14) which has a longitudinal working part (16)
with a tip (18), extending from which the cross-section of the
working part (16) enlarges, in that the tool (5) carries out a
linear back and forth movement in axial direction, the stroke width
of said movement being used for the adjustment of the hole size,
and whereby the edges (27) of the previously formed holes (25) of
the film or foil (2) are crimped.
21. Device for the perforation of films or foils (2), comprising a
tool (14) for piercing the film or foil (2), whereby the tool (5)
for producing the holes in the film or foil (2): performs a linear
back and forth movement in axial direction, the stroke width of
said movement being used for the adjustment of the hole size, and
has a longitudinal working part (16) with a tip (18), extending
from which the cross-section of the working part (16) enlarges, and
comprising a means (19) for the subsequent crimping of the edges
(27) of the produced holes (25).
Description
CROSS REFERENCE TO RELATED APPLICATION
[0001] This application claims the priority of European Patent
Application No. 06 006 503.4, filed on Mar. 29, 2006, the subject
matter of which, in its entirety, is incorporated herein by
reference.
BACKGROUND OF THE INVENTION
[0002] The invention relates to a method and to a device which can
be used for the manufacture of perforated films or foils.
[0003] Frequently, films or foils, for example plastic films, metal
foils or plastic film/metal foil laminates are provided with a
number of holes, in which case the holes frequently should have
only a small hole diameter. Basically, various methods have been
known for the manufacture of perforated films or foils.
[0004] Document DE 299 08 254 U1 discloses the manufacture of
perforated films or foils with the use of two contra-directionally
rotating rollers, between which the film to be perforated is
passed. The rollers are provided with teeth having cutting edges
that form short tears that are more or less widened by the wedge
shape of the teeth.
[0005] Referring to this method, no material is removed from the
film or foil. There is the risk that the formed tears will mostly
close again if the film exhibits elastic properties.
[0006] Furthermore, referring to document DE 39 06 573 A1, a method
for punching very small holes in a film web or a tubular film has
been known, in which case the film web is guided over a plunge-cut
roller. The plunge-cut roller is provided with strips of needles,
whereby the needles puncture the film web when the strips of
needles are guided radially outward by an eccentric guide.
[0007] Document JP 2001 001 007 A discloses a method for the
manufacture of a perforated metal foil with the use of a profiled
roller and an elastic support. The metal foil that is to be
perforated is placed on the elastic support, across which the
profiled roller is rolled. As a result of the exerted pressure,
sections of the elastic support penetrate cutouts of the roller and
thus separate sections of foil, thus removing them from the foil.
This is a punching process.
[0008] Furthermore, thin metal sheets, e.g., metal foils that are
not too thin, can be pierced by means of piercing dies, in which
case each piercing die is associated--on the other side of the
foil--with a cutting plate having a cutting opening that forms a
cutting gap with the piercing die.
[0009] As the thickness of the metal sheet or of the foil
decreases, this method is limited because the cutting gaps must be
narrower than the thickness of the foil. If the foils are too thin,
it is hardly possible to obtain adequate tool life quantities. In
addition, considering very small hole diameters of, e.g., 100
.mu.m, it can hardly be ensured that all piercing dies (e.g.,
several hundred or several thousand) find their associate holes in
the cutting plate.
[0010] Considering this, the object of the invention is to provide
a method with which perforated films or foils can be manufactured
in a simple and economical manner.
SUMMARY OF THE INVENTION
[0011] This object is achieved in accordance with the method of
Claim 1:
[0012] Referring to an inventive method, first holes are produced
in the film, e.g., in that the film or foil is pierced at several
locations. Then, the edges of the resultant holes of the film or
foil are compressed. As a result of this measure, it is achieved
that short film or foil tags or film or foil flaps projecting from
the edges of the hole will not re-close the hole that has formed.
Rather, these tags or flaps are deformed in such a manner that
they, even if they were to slightly relax in an elastic manner,
could no longer close the resultant hole.
[0013] This method is suitable for metal foils and plastic films,
or for plastic film/metal foil laminates, such as, for example,
metal-coated plastic films, or metal foils having a plastic
coating, paper having a metal coating, paper having a plastic
coating, or varnished films or foils of different materials. The
thickness of the film or foil may vary within wide limits. The
method is particularly suitable for process films or foils having a
thickness of a few tens of micrometers, for example, 50 .mu.m. The
film or foil may be provided with holes having a diameter of less
or greater than the thickness of the film or foil. For example, an
aluminum foil having a thickness of 50 .mu.m can be pierced with
holes having a diameter of 100 .mu.m. While the hole is initially
opened during the step of piercing the foil, the hole is fixed
during the step of crimping of the edge. As a result of this, the
shape of the hole may be maintained or modified, depending on
process management. The shape of the hole can largely be fixed or
even be left to incidental process influences.
[0014] The produced holes may essentially be round or polygonal or
have an irregular form. The shape of the hole can be affected by
the cross-sectional configuration of a needle-like tool for
piercing the film or foil, and/or--if said tool does not have a
circular cross-section--can be affected by the alignment of the
cross-section of the tool relative to the advance direction of the
film or foil. In addition, the shape of the hole can be affected by
the way the edges of the hole are crimped.
[0015] Preferably, the holes are produced with needle-like tools
that have a tip and a conically enlarging section. After the tip
has through the preferably non-moving film or foil, the tool is
further moved in axial direction, whereby the resultant hole is
widened. The thusly displaced material forms flaps or tags which
project from the film or foil. During the crimping operation, these
flaps or tags are pressed against the reverse side of the film or
are pressed into said reverse side. The resultant hole edges are
relatively smooth. They essentially consist of former surface parts
of the film or foil that has been pulled into the hole. Likewise,
the reverse side of the film or foil is mostly smooth due to the
crimping operation.
[0016] Another object of the invention is to provide a device for
the manufacture of perforated films or foils. An appropriate device
comprises means for puncturing the film or foil, as well as means
for the preferably non-moving or, optionally, moving support of the
film or foil during the piercing operation. Furthermore, a means
for crimping the edges of the generated holes is provided. The
means for the compression of the edges of the generated holes
permits a fixation of the holes that have been produced by a
piercing process, so that said holes cannot involuntarily close.
The holes are fixed as to their form and diameter.
[0017] The means for piercing the film or foil preferably is a tool
having a longitudinal working part with a tip with--extending
therefrom--a progressively enlarging cross-section of the working
part. Considering this, the working part has--at least in part, or
even in full, a conical configuration. The increase in diameter of
the working part--in the direction extending from the tip--may be
linear, progressive or degressive or
degressive-progressive-degressive (s-shaped), or otherwise. The tip
of the working part may be configured as a point or as a cutting
edge. If it is a pointed tip, the tip consists of a spherical
section or a similarly configured surface area having a very small
radius. If the tip is configured as a cutting edge, the working
part terminates in a straight or curved edge that creates a small
cut in the film or foil during the piercing operation, said cut
being widened by the working part. In order to produce a hole, the
tool can perform a linear back and forth movement in axial
direction. However, it is also possible to mount the tool or
several tools to a rotating machine element, e.g., a roller, in
order to perforate a passing film or foil. In that case, a support
means for the film or foil is not necessary. Then the support
means, e.g., may also be an air cushion.
[0018] By designing the tip as a cutting edge and by aligning the
cutting edges relative to the material transport direction of the
film or foil, for example, along said film or foil, the position of
the flaps or tags created on the film or foil by the piercing tools
can be fixed in a manner favorable for the subsequent crimping
operation in order to push the flaps or tags back onto the reverse
side of the film or foil, however, not into the pierced hole.
[0019] The working part of the tool may have a circular
cross-section, a knife-type cross-section, a polygonal
cross-section or another cross-section. Knife-type and polygonal
cross-sections permit the targeted fixation of the positions of
tags or flaps that have initially formed on the hole edge. A
knife-type cross-section, e.g., is a narrow two-corner cross
section (two corners and edges bent away from each other) or a
triangular or polygonal cross-section having at least one very
acute angle (e.g., a narrow rhombus).
[0020] The working part may have a section with a constant
cross-section. This is advantageous when the size of the pierced
hole is to be independent of the stroke width of the tool. If the
piercing operation is restricted to the conical section of the
working part, the stroke width can be used to control the hole
size.
[0021] When it is perforated, the film or foil is placed on the
means for supporting it, for example, a support table. Preferably,
this table is provided with openings into which move the needles or
other tools. Preferably, the openings have a diameter that is
clearly greater than the diameter of the working part associated
with the respective opening. Preferably, the diameter has a size
that prevents a cutting gap from forming. The annular space between
the working part and the wall of the opening has a width that is
greater than the thickness of the film or foil in order to prevent
the hole edges that have been pierced in the opening from being
pinched.
[0022] The means for crimping the edges of the holes has preferably
two elements with pressure surfaces, between which the film or foil
is pressed. The elements may be arranged so that they can be moved
in linear direction or so that they can be rotated. Furthermore,
the elements can optionally be designed in a stiff or even flexible
manner. For example, they may represent a stiff or an elastic
support, an associate stiff or flexible stamp, as well as represent
stiff or flexible rollers.
[0023] In order to continuously move the film or foil or
intermittently consistent with the cycle of the piercing movement
of the needle-like tools, a transport device is preferably
provided. The transport device may, at the same time, be the means
for crimping the edges of the produced holes in a modular unit. For
example, two rollers, which intermittently advance the film or foil
and between which the film or foil is moving, may at the same time
crimp the edges of the holes. Also, clamping jaws that compress the
film or foil may periodically clamp the film or foil in place and
intermittently advance the film or foil.
[0024] Details of advantageous embodiments are obvious from the
claims, the drawing or the description. The drawings illustrate
exemplary embodiments of the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 is an illustration, partially in section, of a device
for the perforation of a film or foil;
[0026] FIG. 2 is a schematic view of a section, on an enlarged
scale, of the device in accordance with FIG. 1, before the
production of a hole;
[0027] FIGS. 3 and 4 are a schematic illustration, vertically in
section, of the device in accordance with FIG. 2 in different
stages during the production of a hole;
[0028] FIG. 5 is the device in accordance with FIGS. 2 through 4,
after the production of the hole;
[0029] FIG. 6 is the part belonging to the device in accordance
with FIG. 1, for crimping the hole edges, before crimping the hole
edges;
[0030] FIG. 7 is the device part in accordance with FIG. 6, while
crimping the hole edges;
[0031] FIG. 8 is an illustration of the hole, in vertical section,
of the film or foil with the produced perforation, after
crimping;
[0032] FIG. 9 is a side view of a section of the working part of
the tool for the production of a hole; and,
[0033] FIGS. 10 to 14 are various configurations of the tip and of
the cross-section of the working part in accordance with FIG. 9,
viewed in the direction onto the tip.
DETAILED DESCRIPTION OF THE INVENTION
[0034] FIG. 1 is a schematic illustration of a device 1 that is
used for the perforation of a film or foil 2 that is guided as a
film or foil web through the device 1. The film or foil 2 is wound,
e.g., on a roll 3 which is supported by a pull-off device 4 and is
driven to rotate, in a specified manner if necessary. The pull-off
device 4 may act as the transport device for the intermittent
movement of the film or foil 2. Alternatively, not specifically
illustrated claws or rollers may be provided which advance the film
or foil 2 in an intermittent manner.
[0035] The device 1 comprises a means 5 for piercing the film or
foil 2. Referring to the present exemplary embodiment, the means 5
comprises a support means designed as a lower tool 6. The latter is
designed as a perforated plate, in which case the film or foil 2
preferably slides across the flat upper side of said plate. The
upper side of the perforated plate represents a support surface 7
for the film or foil 2.
[0036] Furthermore, the means 5 comprises an upper tool 8 with a
tool guide plate 9 having a preferably flat underside. The tool
guide plate 9 forms a gap together with the support surface 7. The
tool guide plate 9 has openings 10, opposite which openings 11 in
the lower tool 6 are provided. The diameters of the openings 10, 11
may be the same or may be different from each other.
[0037] In addition, the upper tool 8 has a head holding plate 12
which holds the heads 13 of needle-like tools 14 used for piercing
the film or foil. The tools 14 comprise, for example, a cylindrical
shaft 15 that extends into the openings 10 and is guided in these
in a sliding manner. Extending from the shaft 15 is a working part
16 having a diameter that is preferably substantially smaller than
the diameter of the opening 11. The working part 16 is preferably a
straight section that extends in longitudinal direction relative to
the shaft 15 and terminates via a conical section 17 in a tip 18
(FIG. 2).
[0038] As indicated in FIG. 2, the head holding plate 12 and the
tool guide plate 9 are supported, so that they can be moved
relative to each other, in which case the tool holding plate 9 is
elastically tensioned against an abutment away from the head
holding plate 12. The head holding plate 12 is connected to a not
specifically illustrated drive which is designed to impart a
back-and-forth movement as indicated by an arrow in FIG. 1. The
travel is large enough so that, on the one hand, the tool guide
plate 9 can lift off the film or foil and that, on the other hand,
the working parts 16 of the tools 14 can pierce the film or foil
2.
[0039] Furthermore, the device 1 comprises a means 19 for crimping
the film or foil 2 in order to fix the produced holes in position.
Referring to the exemplary embodiment in accordance with FIG. 1,
this means 19 consists of a stationary element 20 and a movably
arranged element 21, which have, on their sides that face each
other, preferably flat pressure surfaces 22, 23. Whereas the
element 20 is preferably arranged in a stationary manner next to
the preferably also stationary lower tool 6, or is a part thereof,
the element 21--as indicated by an arrow in FIG. 1--can be moved
toward the element 20 and away therefrom. The element may be
arranged in a rigid or resilient, for example, spring-biased manner
and/or be connected to the head holding plate 12 or to its own
drive. Alternatively, it is not only possible to move the two
elements 20, 21 toward each other and away from each other but to
additionally move them in the advance direction of the film or foil
2 and in a back-and-forth oscillating manner, in order to
intermittently advance the film or foil 2.
[0040] For example, the device 1 is used for the perforation of
plastic films or metal foils, for example, aluminum foils, or for
the perforation of laminate films or foils that consist of plastic
material, metal or even of other materials. Preferably, said device
is used for the perforation of films or foils of a material that
can be plastically deformed. To achieve this, the head plate 2
holds appropriate tools 14 in several rows, which extend preferably
across the entire width of the film or foil 2, or at least across
the width of the area that is to be perforated. The tools 14 of the
individual rows (for example, ten rows) can be offset with respect
to each other, or they may be arranged in another pattern.
[0041] Using the device 1 in accordance with FIG. 1, the film or
foil 2 is perforated in the following manner:
[0042] As illustrated by FIGS. 1 through 6, the film or foil 2 is
placed in the gap between the upper tool 8 and the lower tool 6, as
well as between the elements 20 and 21. The end of the film or foil
2 is grasped by the pick-off device 4. The film or foil 2 is
supported by the support surface 7, which, consequently, forms a
means 24 for supporting the film or foil 2 during the subsequent
piercing operation.
[0043] In order to perform the piercing operation or the piercing
step, the head plate 12 is moved in the direction toward the lower
tool 6 until the tool guide plate 9 clamps the film or foil 2
against the support surface 7. FIG. 2 shows this mode.
[0044] While the plate 9 supports the film or foil 2 the head plate
12 is moved further downward, so that the tip 18 pierces the film
or foil 2, as illustrated by FIG. 3. A puncture hole is formed,
said hole being widened by the conical section 17 when the tool 14
continues to move downward into the opening 11. Preferably, in so
doing, the tool 14 is moved far enough for he cylindrical section
of the working part 16 to enter the hole 25 now created in the film
or foil 2. The film or foil material that is forced out of the hole
25 hangs downward in the form of a tag or flap 26 into the opening
11 and thus forms an edge 27 of the hole 25 (FIG. 4).
[0045] In this state, the hole 25 is completely open. The upper
tool 8 is again moved away from the lower tool 6, whereby, as
illustrated by FIG. 5, the working part 16 and the tip 18 are first
moved out of the hole 25, and the tool guide plate 9 is lifted off
the film or foil 2. In so doing, said plate carries the film or
foil 2 somewhat along, so that the film or foil is also lifted off
the support surface 7. Optionally, this operation can be aided by
injecting air (pressurized air) in the opening 11 or in separate
blow openings that extend through the support surface 7.
[0046] As long as the film or foil 2 between the support surface 7
and the tool guide plate 9 is released, said film or foil is
advanced by one step, which, for example, is as large as the length
of film or foil detected by the tool 5, said length being measured
in film or foil transport direction (in FIG. 5, from left to
right). The perforated parts of the film or foil 2 thus arrive
between the pressure surfaces 22, 23 of the elements 20, 21.
Referring to FIG. 6, this is shown by the just opened hole 25. Now
the elements 20, 21 are moved toward each other in such a manner
that the pressure surfaces 22, 23 clamp the film or foil 2 between
them. In so doing, the flaps or tags 26 are crimped. FIG. 8 shows
an optional method as to how to this may be achieved. The tags 26
are cramped and folded onto the reverse side of the film or foil 2
that had been positioned on the support surface 7 when the hole 25
was opened. In so doing, the tags 26 are plastically deformed at
least to such an extent that they will not move back into the
cross-section of the hole 25. They may also be pressed flat against
the reverse side of the film or foil. There, they may be positioned
loosely or they may be cemented to the reverse side or cold-welded
thereto. It is possible to aid the pressing operation by additional
measures, for example, by the application of ultrasound to at least
one of the elements 20, 21, by the application of heat or by
material fixing agents, for example, fixing varnishes or adhesive
varnishes that are to be applied to the reverse side of the foil or
film around the holes 25.
[0047] FIGS. 9 and 10 show a first embodiment of the tool 14 as can
be used for the perforation of the film or foil. In so doing, the
working part 16 is essentially cylindrical, whereby the section 17
forms a circular cone having a rounded tip 18. FIG. 10 shows the
working part 16 of the tool 14, with a view on the tip 18.
[0048] Alternatively, the tip 18 have a different configuration as
shown by FIGS. 11 through 14, in particular. Referring to FIGS. 11
and 12, the tip 18 is configured as a cutting edge, whereby the
cutting edge may be relatively short (FIG. 11) or may be long
enough so that it corresponds approximately to the diameter of the
working part 16 (FIG. 12). In the latter case, the section 17 has a
knife-type cross-section, which, beginning on an end-side cutting
edge, gradually terminates in the circular section of the working
part 16.
[0049] As shown by FIG. 13, the tip 18 may also have a pyramid
shape in section 17. The cross-section of section 17 thus is
bordered by a polygonal configuration, at least in some parts. As
shown by FIG. 14, it is also possible to design the section 17, as
well as the remaining part of the working part 16, in a polygonal
configuration, for example, in triangular, square or rectangular
configuration. In this, way non-round holes 25 can be produced.
[0050] The means for piercing the film or foil can be, as
illustrated, a needle-like tool 14 or also any other means suitable
for piercing the film or foil 2, such as, for example a sharp air
jet or water jet, miscellaneous fluids or pressure waves generated
therein, flexible elements or the like. The means for crimping the
edges of the produced holes may be rigid, flat or non-flat surfaces
provided on appropriate elements, or may also be non-concrete
means, such as, for example, fluids or pressure waves generated in
fluids.
[0051] A device for the manufacture of perforated films or foils
comprises a means 5 for the perforation of the film or foil 2, as
well as a means 19 for crimping the edges 27 of the thusly produced
holes 25. By crimping the edges 27 or the tags 26 of film or foil
material, the holes 25 are fixed after having been opened. Punching
tools for cutting the perforation out of the film or foil 2 are not
required for the production of the holes 25. Rather, the desired
hole 25 is first created as puncture, or as a cut, and is then
widened during the perforating operation. During the crimping
operation, the material bent out of the plane of the film or foil
is fixed in place in such a manner that it will not close the
pierced hole again.
LIST OF REFERENCE NUMBERS
[0052] 1 Device [0053] 2 Film or foil [0054] 3 Roll [0055] 4
Pull-off device [0056] 5 Means [0057] 6 Lower tool [0058] 7 Support
surface [0059] 8 Upper tool [0060] 9 Tool guide plate [0061] 10, 11
Openings [0062] 12 Head holding plate [0063] 13 Heads [0064] 14
Tools [0065] 15 Shaft [0066] 16 Working part [0067] 17 Section
[0068] 18 Tip [0069] 19 Means [0070] 20, 21 Element [0071] 22, 23
Pressure surfaces [0072] 24 Means [0073] 25 Hole [0074] 26 Tag
[0075] 27 Edge
* * * * *