JP2007290117A - Method and device for manufacturing perforated film or foil - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a perforated film or foil in a simple and economic manner. <P>SOLUTION: The device has a means 5 for perforation of a film or foil 2, and a means 19 for crimping an edge of a thus-formed hole. By crimping the edge, the hole is fixed after having been opened. There is no need of a punching tool for cutting the perforation out of the film or foil. Rather, a desired hole is first formed as a hole or cut line, and then enlarged. At the time of a crimping action, a material bent from a plane of the film or foil is fixed to a predetermined position not to re-close the bored hole. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and apparatus which can be used for the production of perforated films or foils.

  Often, films and foils, such as plastic films, metal foils, or plastic film / metal foil laminates, are provided with a large number of holes, in which case the hole diameters of these holes need only be small. . Basically, various methods for the production of perforated films or foils are known.

  Document DE 29908254U1 discloses the production of a perforated film or foil using these rollers, in which the film to be perforated is passed between two counter-rotating rollers. The rollers are provided with teeth having cutting edges, which form a short tear that is somewhat widened by the wedge shape of the teeth.

  Referring to this method, no material is removed from the film or foil. If the film is elastic, the tears formed can often close again.

  Furthermore, referring to document DE 3906573 A1, it is well known how to make very small holes in a film web or tubular film, in which case the film web is guided over a plunge cut roller. The The plunge cut roller is provided with several needles, whereby the needles perforate the film web when several needles are guided radially outward by the eccentric guide.

  Document JP 2001 001 007A discloses a method for the production of perforated metal foils using shaped rollers and elastic supports. The metal foil to be perforated is placed on an elastic support and the shaped roller is rotated throughout. As a result of the pressing, the parts of the elastic support sink into the roller cutout, thus separating the parts of the foil and removing them from the foil. This is the punching process.

  Furthermore, a thin metal sheet (eg a metal foil that is not too thin) can be pierced by a piercing mold, where each piercing mold forms a cutting gap with the piercing mold on the opposite side of the foil. Is associated with a cutting plate having

This method is limited as the thickness of the metal sheet or foil is reduced, the cutting gap must be narrower than the thickness of the foil. If the foil is too thin, it is almost impossible to obtain a sufficient tool life. Furthermore, considering very small hole diameters, eg 100 μm, all piercing types (eg hundreds or thousands) can hardly coincide with their corresponding holes in the cutting plate.
DE29908254 U1 DE3905653 A1 JP 2001 001 007A

  In view of these, it is an object of the present invention to provide a method that makes it possible to produce a perforated film or foil in a simple and economical manner.

  This object is achieved according to the method of claim 1.

  Referring to the method of the present invention, holes are first formed in the film, for example, the film or foil is punched at several locations. The hole edges resulting from the film or foil are then squeezed. As a result of this method, a short film or foil tag or film or foil flap does not protrude from the edge of the hole, thereby closing the formed hole again. Rather, these tags and flaps are deformed so that they will no longer close the resulting hole, even if they will loosen slightly elastically.

  This method is suitable for metal foil and plastic film, or plastic film / metal foil laminate, for example, metal film plastic film, metal film with plastic film, paper with metal film, paper with plastic film, or different Examples include films and foils that are overcoated with materials. The thickness of the film or foil can vary within a wide range. This method is particularly suitable for a processing film or foil having a thickness of several tens of μm, for example, 50 μm. The film or foil may be provided with holes having a diameter smaller or larger than the thickness of the film or foil. For example, a hole having a diameter of 100 μm can be formed in an aluminum foil having a thickness of 50 μm. The holes are first drilled during the step of drilling the foil, and the holes are fixed during the step of crimping the edges. As a result, the shape of the hole may be maintained or changed depending on the process. The shape of the hole is generally constant, but may be left to the effects of incidental processing.

  The formed hole may be basically circular or polygonal, or may have an irregular shape. The shape of the hole may be affected by the cross-sectional shape of the needle-like tool for piercing the film or foil, and / or if the tool does not have a circular cross-section, the direction of travel of the film or foil May be affected by the alignment of the cross section of the tool with respect to. Furthermore, the shape of the hole may be affected by the way in which the edge of the hole is crimped.

  Preferably, the hole is formed by a needle-like tool having a tip and a conical enlarged portion. After the tip has penetrated the preferably moving film or foil, the tool is further moved in the axial direction, thereby widening the resulting hole. The material thus displaced becomes a flap or tag and protrudes from the film or foil. During the crimping operation, these flaps or tags are pressed against or pushed into the back side of the film. The resulting hole edges are relatively flat. They are basically composed of the previous surface portion of the film or foil that is drawn into the hole. Similarly, the back side of the film or foil is mostly flat by a crimping action.

  Another object of the present invention is to provide an apparatus for producing a perforated film or foil. Suitable devices have means for punching the film or foil and means for supporting, preferably not moving or selectively moving, the film or foil during the piercing operation. Furthermore, means are provided for crimping the edges of the generated holes. The means for crimping the edge of the generated hole allows the hole formed by the drilling process to be fixed so that the hole does not close involuntarily. The hole is fixed in shape and diameter.

  The means for piercing the film or foil is preferably a tool having a long axis working part with a tip. The operating portion has a cross section that gradually expands from the tip. Considering this, the operating part has a conical shape at least in part or in whole. The diameter of the motion part in the direction extending from the tip may increase linearly, increase or decrease, increase or decrease alternately (S-shape), or others. The tip of the working part may be configured as a point or a cutting edge. In the case of a pointed tip, the tip consists of a spherical part or a similarly constructed surface with a very small radius. When the tip is configured as a cutting edge, the working part becomes a straight or curved edge that forms a small cut in the film or foil during the drilling operation, which is cut by the working part. To form the hole, the tool can perform a linear back and forth movement in the axial direction. However, it is also possible to attach a tool or various tools to a rotating machine element, for example a roller, in order to pierce the passing film or foil. In that case, no support means for the film or foil is required. The support means may be an air cushion, for example.

  The tip is designed as a cutting edge and is formed on the film or foil by a drilling tool, for example by aligning the cutting edge along the film or foil with respect to the material transport direction of the film or foil The position of the flap or tag can be fixed so as to be suitable for the next crimping operation. This allows the flaps and tags to be pressed against the back of the film or foil, but not into the drilled holes.

  The working part of the tool may have a circular cross section, a knife-shaped cross section, a polygonal cross section, or another cross section. Each of the knife-shaped and polygonal cross-sections allows targeted fixation of the position of the tag or flap initially formed at the edge of the hole. The knife-shaped cross-section is, for example, a narrow two-corner cross-section (bent so that the two corners and edges are spaced apart) or a triangle or polygon having at least one very acute angle (e.g. Narrow diamond-shaped cross section.

  The operating part may have a part with a constant cross section. This is advantageous when the size of the drilled hole is not related to the tool stroke width. If the drilling motion is limited to the conical part of the working part, the stroke width can also be used to control the hole diameter.

  When drilled, the film or foil is placed on a means for supporting it, for example a support table. Preferably, the table includes an opening through which needles and other tools move. Preferably, the openings have a diameter that is clearly greater than the diameter of the working part associated with each opening. Preferably, the diameter is such that no cutting gap is formed. The reason why the annular space between the operating portion and the wall portion of the opening is larger than the thickness of the film or foil is to prevent the edge of the drilled hole from being caught between the openings.

  The means for crimping the edge of the hole preferably has two elements with a pressing surface. A film or foil is pressed between the two elements. It may be configured such that the elements are moved in a linear direction or they are rotated. Furthermore, the elements can optionally be designed to be rigid or elastic. For example, it may be a rigid or elastic support, an associated rigid or elastic stamp, or a rigid or elastic roller.

  In order to continuously move the film or foil, or to make it coincide with the cycle of the drilling operation of the needle-like tool, it is preferable to provide a conveying device. The conveying device may simultaneously be a modular unit means for crimping the edges of the formed holes. For example, two rollers that intermittently advance the film or foil and move between the film or foil may simultaneously press the edge of the hole. In addition, a clamping jaw that presses the film or foil may periodically tighten the film or foil at a predetermined position to advance the film or foil intermittently.

  Details of advantageous embodiments are apparent from the claims, the drawings or the description. These drawings show exemplary embodiments of the invention.

  FIG. 1 schematically shows an apparatus 1 used for drilling a film or foil 2 guided in the apparatus 1 as a film or foil web. This film or foil 2 is wound, for example, on a roll 3, which is supported by a pull-off device 4 and is driven to rotate in a predetermined manner as required. The pull-off device 4 may also serve as a transport device for intermittent movement of the film or foil 2. As another method, although not particularly illustrated, a film or foil 2 may be moved forward intermittently by providing a nail or a roller.

  The device 1 has means 5 for punching a film or foil 2. Referring to an exemplary embodiment of the invention, the means 5 has support means designed as a lower tool 6. The lower tool is designed as a perforated plate, in which case the film or foil 2 preferably slides on the flat upper side of the plate. The upper side of the perforated plate is a support surface 7 for the film or foil 2.

  Furthermore, the means 5 has an upper tool 8 with a tool guide plate 9 which preferably has a flat back side. The tool guide plate 9 forms a gap together with the support surface 7. The tool guide plate 9 has an opening 10 on the opposite side of which an opening 11 is provided in the lower tool 6. The diameters of the openings 10 and 11 may be the same or different from each other.

  Furthermore, the upper tool 8 has a head holding plate 12 that holds the head 13 of a needle-like tool 14 used to punch a film or foil. The tool 14 has, for example, a cylindrical shaft 15 that extends into the opening 10 and is guided in a sliding manner in these openings. The diameter of the working part 16 extending from the shaft 15 is preferably much smaller than the diameter of the opening 11. The operating part 16 is preferably a straight part extending in the longitudinal direction with respect to the shaft 15 and terminating at the tip 18 via the conical part 17 (FIG. 2).

  As shown in FIG. 2, the head holding plate 12 and the tool guide plate 9 are supported so as to be able to move relative to each other. Be pulled. The head holding plate 12 is connected to a drive device not shown in detail, which is designed to impart a back-and-forth movement as indicated by the arrows in FIG. The movement is on the one hand so large that the tool guide plate 9 can be lifted from the film or foil and on the other hand the working part 16 of the tool 14 can pierce the film or foil 2.

  Furthermore, the device 1 has means 19 for crimping the film or foil 2 in order to fix the formed hole in place. Referring to the exemplary embodiment according to FIG. 1, this means 19 is preferably composed of a fixed element 20 and a movable element 21 and has flat pressing surfaces 22, 23 on opposite sides. While the element 20 is preferably fixedly located or part of it preferably adjacent to the fixed lower tool 6, the element 21 is attached to the element 20 as indicated by the arrow in FIG. It can move so as to approach and separate. The element 21 may be arranged rigidly or elastically, e.g. spring-biased, and / or connected to the head holding plate 12 or its own drive. Alternatively, it is possible not only to move the two elements 20, 21 closer to and away from each other, but also to move back and forth in the advance direction of the film or foil 2 in order to advance the film or foil 2 intermittently. These elements can be moved further back and forth.

  For example, the device 1 is used for drilling plastic film or metal foil, such as aluminum foil, or for laminating film or foil made of plastic material, metal or other material. Preferably, the device is used for punching a film or foil of a material that can be plastically deformed. To accomplish this, the head holding plate 12 holds several rows of suitable tools 14, which preferably extend over the entire width of the film or foil 2, or at least over the width of the area to be drilled. Individual rows (eg, 10 rows) of tools 14 may be offset from each other or arranged in other patterns.

  By using the device 1 according to FIG. 1, the film or foil 2 is drilled as follows.

  As shown in FIGS. 1 to 6, the film or foil 2 is placed in the gap between the upper tool 8 and the lower tool 6, ie the gap between the elements 20 and 21. The end of the film or foil 2 is gripped by a pull-off device 4. The film or foil 2 is supported by the support surface 7, so that the support surface 7 becomes a means 24 for supporting the film or foil 2 during the next piercing operation.

  The head holding plate 12 is moved in the direction of the lower tool 6 until the tool guide plate 9 presses the film or foil 2 against the support surface 7 in order to carry out a drilling operation or a drilling step. FIG. 2 shows this configuration.

  Since the head holding plate 12 is moved further downward while the tool guide plate 9 supports the film or foil 2, the tip 18 pierces the film or foil 2 as shown in FIG. 3. A hole is formed, which is enlarged by the conical portion 17 as the tool 14 continues to move down into the opening 11. Preferably, in doing so, the tool 14 is moved to such an extent that the cylindrical part of the working part 16 enters the hole 25 formed in the film or foil 2. The film or foil material forced out of the hole 25 hangs down in the opening 11 in the form of a tag or flap 26, thereby forming an edge 27 of the hole 25 (FIG. 4).

  In this state, the hole 25 is completely opened. The upper tool 8 is again moved away from the lower tool 6 so that, as shown in 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 moved to the film or It is lifted from the foil 2. In so doing, the plate is accompanied by some film or foil 2, so that the film or foil is also lifted from the support surface 7. Optionally, this action can be assisted by injecting air (pressurized air) into the opening 11 or into a separate blow opening extending through the support surface 7.

  While the film or foil 2 between the support surface 7 and the tool guide plate 9 is released, the film or foil is advanced one step. One step is, for example, the same as the length of the film or foil detected by the means 5, said length being measured in the film or foil transport direction (from left to right in FIG. 5). The hole in the film or foil 2 thus reaches between the pressing surfaces 22, 23 of the elements 20, 21. Referring to FIG. 6, the hole 25 just opened is shown. Here, the elements 20, 21 are moved closer together so that the pressing surfaces 22, 23 press the film or foil 2 in between. At that time, the flap or tag 26 is crimped. FIG. 8 shows an optional way of how to achieve this. The tag 26 is clamped and folded over the back side of the film or foil 2 positioned on the support surface 7 when the hole 25 is opened. At that time, the tag 26 is plastically deformed to such an extent that it does not return at least within the cross section of the hole 25. These tags may be pressed flat against the back side of the film or foil. Thus, the tags may be positioned flexibly, or may be glued to the back side or cold welded. Further methods, for example by applying ultrasonic waves to at least one of the elements 20, 21, apply heating or material fixing agents, for example fixing varnishes or adhesive varnishes applied to the back side of the film or foil around the holes 25. Thus, the pressing operation can be assisted.

  9 and 10 show a first embodiment of a tool 14 that can be used for film or foil drilling. In so doing, the operating part 16 is essentially cylindrical, whereby the part 17 forms a circular cone with a rounded tip 18. FIG. 10 shows the operating portion 16 of the tool 14 as viewed from the tip 18.

  Alternatively, the tip 18 has a different shape, particularly as shown in FIGS. Referring to FIGS. 11 and 12, the tip 18 is configured as a cutting edge. The cutting edge may have a relatively short length (FIG. 11) or a length that substantially corresponds to the diameter of the operating portion 16 (FIG. 12). In the latter case, the part 17 has a knife-shaped cross section starting from the end on the cutting edge side and ending gradually over the circular cross section of the working part 16.

  As shown in FIG. 13, the tip 18 may have a pyramid shape at the portion 17. The cross section of the portion 17 is formed of a polygon that forms at least a plurality of boundaries. As shown in FIG. 14, it is also possible to design the part 17 and the remaining part of the working part 16 in a polygonal configuration, for example a triangular, square or rectangular configuration. In this way, the non-circular hole 25 can be formed.

  The means for piercing the film or foil may be a needle-like tool 14, as shown, or any other means suitable for piercing the film or foil 2, such as a sharp air jet, a water jet, a wide variety of Or a pressure wave generated within the fluid, a flexible element, or the like. The means for crimping the edge of the formed hole may be a rigid, flat or non-planar surface provided in a suitable element, or it may be a non-solid means such as a fluid or a pressure wave generated inside the fluid. .

  The device for producing a perforated film or foil comprises means 5 for piercing the film or foil 2 and means 19 for crimping the edges 27 of the holes 25 thus formed. The holes 25 are fixed after being drilled by crimping the edges 27 or tags 26 of film or foil material. A punching tool for cutting holes from the film or foil 2 is not necessary for forming the holes 25. Rather, the desired hole 25 is first formed as a hole or cut and then widened during the drilling operation. During the crimping operation, the material bent from the plane of the film or foil is fixed in place so as not to close the drilled hole again.

FIG. 1 is a partial cross-sectional view of an apparatus for punching a film or foil. FIG. 2 is a schematic cross-sectional view showing, on an enlarged scale, a part of the apparatus according to FIG. 1 before forming a hole. FIG. 3 is a schematic vertical cross-sectional view of the device according to FIG. 2 at different stages in forming the hole. FIG. 4 is a schematic vertical sectional view of the device according to FIG. 2 at different stages in forming the holes. FIG. 5 shows the device according to FIGS. 2 to 4 after the hole has been formed. FIG. 6 shows the part belonging to the device according to FIG. 1 for crimping the edge of the hole before crimping the edge of the hole. FIG. 7 shows the device part according to FIG. 6 when crimping the edge of the hole. FIG. 8 is a vertical cross-sectional view of a hole in a film or foil having perforations formed after crimping. FIG. 9 is a side view showing an operation part of a tool for forming a hole. FIG. 10 is a diagram showing the configuration of the cross section of the operating portion according to FIG. 9 as viewed from the tip and the tip. FIG. 11 is a diagram showing the structure of the cross section of the operating portion according to FIG. 9 as viewed from the tip and the tip. FIG. 12 is a diagram showing the configuration of the cross section of the operating portion according to FIG. 9 as viewed from the front end and the front end. FIG. 13 is a diagram showing the configuration of the cross section of the operating portion according to FIG. 9 as viewed from the tip and the tip. FIG. 14 is a diagram showing the configuration of the cross-section of the operating portion according to FIG. 9 as viewed from the tip and the tip.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus 2 Film or foil 3 Roll 4 Pull-off apparatus 5 Means 6 Lower tool 7 Support surface 8 Upper tool 9 Tool guide plate 10, 11 Opening part 12 Head holding plate 13 Head 14 Tool 15 Shaft 16 Operating part 17 Part 18 Tip 19 Means 20, 21 Element 22, 23 Press surface 24 Means 25 Hole 26 Tag 27 Edge

Claims (21)

A hole (25) is first formed in the film or foil (2),
The resulting edge (27) of the hole (25) in the film or foil (2) is crimped,
A method for producing a perforated film or foil (2).   The method according to claim 1, characterized in that the hole (25) is formed with a needle-like tool (14).   2. A method according to claim 1, characterized in that the film or foil (2) is guided between two clamping elements (6, 9) to be pierced and clamped between the elements.   The method according to claim 1, characterized in that, in order to form the hole (25), a perforated hole is first formed and the hole is subsequently widened.   The material present on the film or foil (2) is folded and pressed against the film or foil when crimping the edge (27) of the hole (25). The method according to 1. Means (5) for forming holes in the film or foil (2);
Means (19) for crimping the edge (27) of the hole (25) formed,
Device for drilling film or foil (2).   7. The device according to claim 6, further comprising means for supporting the film or foil (2) during a punching operation.     The means (5) for drilling the film or foil (2) is a tool (14) having a long axis working part (16) with a tip (18), the cross section of the working part (16) being The device according to claim 6, wherein the device grows from the tip.   9. Device according to claim 8, characterized in that the operating part (16) is configured in a needle shape.   9. Device according to claim 8, characterized in that the tip (18) is a pointed tip.   9. Device according to claim 8, characterized in that the tip (18) is configured as a cutting edge.   9. Device according to claim 8, characterized in that the working part (16) has a circular cross section.   9. Device according to claim 8, characterized in that the working part (16) has a knife-shaped cross section.   9. A device according to claim 8, characterized in that the operating part (16) has a polygonal cross section.   9. Device according to claim 8, characterized in that the operating part (16) has a part with a constant cross-section.   The means for supporting the film or foil (2) has a support surface (7) in which an opening associated with the tool (14) for forming the hole (25) 9. Device according to claim 8, characterized in that a part (11) is provided.   Device according to claims 8 and 16, characterized in that each of the openings (11) has a diameter that is larger than the diameter of the working part (16) associated with the opening (11).   A first element (20) wherein the means (19) for crimping the edge (27) of the hole (25) comprises a pressing surface (22) facing the back surface of the film or foil (2). A second element (21) having a pressing surface (23) facing the surface of the film or foil (2), and further approaching and separating the two elements (20, 21) in a controlled manner 7. A device according to claim 6, characterized in that it comprises drive means for moving in such a way.   7. The film or foil (2) according to claim 6, characterized in that it is associated with a conveying device (4) in order to move the film or foil intermittently in the device (1). apparatus. A hole (25) is first formed in the film or foil (2) by a tool (14) having a long axis working part (16) with a tip (18), the cross section of the working part (16) being Grows from
The tool performs a linear back and forth motion in the axial direction, and the stroke width of the motion is used to adjust the size of the hole;
The edge (27) of the hole (25) already formed in the film or foil (2) is crimped;
A method for producing a perforated film or foil (2). A tool (14) for drilling a film or foil (2), the tool for forming a hole in the film or foil (2),
Performing a linear back and forth motion in the axial direction, the stroke width of the motion being used to adjust the size of the hole;
Having a long axis working part (16) with a tip (18), the cross section of the action part (16) being larger from the tip;
After that, it comprises means (19) for crimping the edge (27) of the hole (25) formed,
Device for drilling film or foil (2).

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