JP6655205B1 - Punching tool and punching method - Google Patents

Abstract

An object of the present invention is to provide a punching tool that can reliably collect punching waste with a relatively simple configuration when forming a through hole in a resin film. Also provided is a method for punching the resin film using the punching tool. A punching tool 1 is a punching tool for forming a through-hole in a resin film, and has a support 2 and a cylindrical shape, and has a cutting edge 3a at one end and the other end. Is provided with a blade die 3 coupled to the support 2, and a first elastic body 4a housed inside the blade die 3. Among the ends of the first elastic body 4a in the axial direction of the cylindrical shape, the end farther from the support 2 is located farther from the support 2 than the position of the cutting edge 3a, and the first elastic body 4a is When the pressure is applied to the support body 2 in the axial direction, it shrinks, and the end farther from the support body 2 can move to a position closer to the support body 2 than the position of the cutting edge 3a. . [Selection diagram] Fig. 1

Description

  The present invention relates to a punching tool for forming a through hole in a resin film, and a method for punching the resin film.

  Polarizers used in the image display portion of terminals such as smartphones and tablets are increasing in number due to diversification of terminal shapes, physical buttons, camera holes, and the like. Above all, a small-diameter hole used as a camera hole or the like exists apart from the outer edge of the polarizing plate, and therefore, processing quality and processing accuracy are particularly required.

  As a method of forming a hole having a small diameter, for example, a method of drilling with a drill and a method of punching with a blade having the same shape as the hole are known. However, the drilling method has a high processing quality and dimensional accuracy, but requires a long processing time and a long processing time. On the other hand, in the method of punching with a blade die, although the number of processing steps and the processing time are short, there is a problem in processing of debris of the polarizing plate (punching debris) generated when punching. Since the punched dust easily adheres to the surface of the polarizing plate due to static electricity or stickiness of the pressure-sensitive adhesive layer laminated on the polarizing plate and causes deterioration in quality, it is necessary to surely remove the cutting waste.

  Conventionally, as a method of reliably removing punching debris generated when a film is punched with a blade die, air is blown from inside the blade die to prevent punch debris from remaining inside the blade die, There is known a method of collecting punched waste by sucking it from the opposite side (for example, Patent Documents 1 and 2).

  One form of a polarizing plate having a camera hole or the like is a polarizing plate including a polarizing film partially having a non-polarizing portion. As a manufacturing means of the polarizing film included in such a polarizing plate, for example, on one surface of the long polarizing film, a long surface protection film having through holes arranged at predetermined intervals is laminated, Obtain a long polarizing film laminate, using the surface protective film as a mask, contact this polarizing film laminate with a basic solution, the polarizing film of the portion of the surface protective film with through-holes with the basic solution. Patent Document 3 discloses a technique for decoloring by contact to become a non-polarized portion.

JP-A-4-336998 JP-A-10-225899 JP 2016-27394 A

  However, the methods described in Patent Literature 1 and Patent Literature 2 have a problem that the device configuration becomes large. In addition, when the method of collecting by blowing or sucking the wind is applied to the punching process of the polarizing plate, there is also a problem that it cannot always be sufficiently recovered depending on the static electricity of the polarizing plate and the degree of stickiness of the adhesive layer. is there. The surface protection film required in the production method described in Patent Document 3 has through holes at predetermined intervals, and an adhesive layer is indispensable for laminating a polarizing film, but a specific production method of the surface protection film, In particular, Patent Literature 3 does not disclose any means for removing waste (punched waste or the like) at the time of forming a through hole.

  Accordingly, an object of the present invention is to provide a punching tool that can reliably collect punching waste with a relatively simple configuration when forming a through hole in a resin film. Another object of the present invention is to provide a punching method using the punching tool.

  The present invention is a punching tool for forming a through-hole in a resin film, comprising a support, a cylindrical shape having a cutting edge at one end and having the other end joined to the support. And a first elastic body accommodated in the inside of the blade mold, and the end of the first elastic body in the axial direction of the cylindrical shape, which is farther from the support, has a blade tip. Or at a position farther from the support than the position of the cutting edge, the first elastic body contracts when pressure is applied to the support in the axial direction, and Provided is a punching tool whose distal end can be moved to a position closer to a support than a position of a cutting edge.

  When forming a through-hole in a resin film using this punching tool, the first elastic body contacts the resin film before or at the same time as the cutting edge of the blade mold, and then the first elastic body shrinks due to pressure. The cutting edge comes into contact with the resin film. Thereafter, when the blade is pulled out after forming the through hole, the first elastic body extends so as to return to the original shape according to the pulling out of the blade, and the blade is delayed to separate from the resin film, or At the same time, it separates from the resin film. That is, the first elastic body plays a role of holding down the punched chips until the blade die separates from the resin film. This prevents the cutting waste from adhering to the blade die and being pulled up, and the cutting waste remains at the position where the resin film is placed. Therefore, the punching chips are not scattered on the resin film, and the punching chips do not enter the blade die and remain in the blade die, and the punching chips can be reliably collected.

  In this punching tool, it is preferable that, of the ends of the first elastic body in the axial direction of the cylindrical shape, the end that is farther from the support is located farther from the support than the position of the cutting edge. With this configuration, when the resin film is cut by the cutting edge, the first support comes into contact with the resin film before the cutting edge comes into contact with the resin film, so that the resin film is cut while pressing the resin film. be able to. Therefore, there is an effect that the cutting position is not easily shifted.

  The punching tool further includes a second elastic body disposed around the blade mold and on the support, and an end of the second elastic body in the axial direction of the cylinder that is farther from the support. Is located at substantially the same position as the position of the cutting edge, or at a position farther from the support than the position of the cutting edge, the second elastic body contracts when pressure is applied toward the support in the axial direction, The end farther from the support may be moved to a position closer to the support than the position of the cutting edge. In this case, the second elastic body has a role of holding down the resin film around the punching waste in the same manner as the first elastic body has a role of holding down the punching waste until the blade die separates from the resin film. Fulfill. Thereby, the position of the resin film can be stabilized at the time of punching, and not only the punched chips but also the resin film reliably stays at the originally placed position, and the punched chips are scattered due to mutual positional deviation. Is prevented.

  In this punching tool, it is preferable that the end of the second elastic body in the axial direction of the cylinder that is farther from the support is located farther from the support than the position of the cutting edge. With this configuration, the position of the resin film can be stabilized at the time of punching, and not only the punched chips but also the resin film can be securely held at the originally placed position, and the cutting edge is formed by the second elastic body. Since the worker hides, the worker handling the punching tool of the present invention can sufficiently prevent the worker from touching the cutting edge.

  In this punching tool, the end of the first elastic body in the axial direction that is farther from the support is closer to the end of the second elastic body that is farther from the support in the axial direction. Alternatively, it may be configured to be located far from the support. If the positional relationship between the ends is this way, the punched waste will be held down by the elastic body longer than the resin film, and the punched waste will stay at the mounting location more strongly than the resin film. Become. Therefore, when the resin film is removed first after the punching, the punching waste is prevented from being dragged and scattered by the resin film.

  The end of the first elastic body that is farther from the support may have a surface subjected to a release treatment. This prevents the punched waste from adhering to the surface of the first elastic body.

  The outer diameter of the cutting edge may be 5 mm or less.

  The hardness of each of the first elastic body and the second elastic body may be 25 to 50. With this hardness, it is easy to achieve the expected movement of the end of the elastic body when pressure is applied to each elastic body.

  Further, the resin film to be punched may have a pressure-sensitive adhesive layer and a release sheet. When the punching dust is scattered on the resin film, the tackiness of the pressure-sensitive adhesive layer becomes an obstacle when removing the punching dust, and the number of the punching dust increases due to peeling of the release sheet. According to the punching tool of the present invention, even if the resin film has an adhesive layer and a release sheet, the punching waste can be reliably collected, so that a tool for forming a through hole in the resin film. Can be suitably used.

  Further, the present invention is a punching method for forming a through hole in a resin film using the punching tool, wherein the resin film and the backing plate are arranged so as to be orthogonal to the axial direction in the cylindrical axial direction. An arranging step of opposing the blade mold; relatively bringing the resin film and the blade mold closer and in contact with each other in the axial direction; the first elastic body is contracted in the axial direction, and the resin film is pushed off by the blade mold and the resin is pushed out. A punching step of forming a through-hole in the film, a separating step of relatively separating the resin film and the abutment plate and the blade mold in the axial direction, and leaving punched chips generated by the formation of the through-hole on the abutment plate; Is provided. Thereby, a through-hole can be formed in the resin film by the above-mentioned action, and the punching waste can be reliably collected.

  Here, the configuration may be such that the static friction coefficient of the surface of the backing plate is 0.3 or less. This makes it easier for punched chips to remain on the backing plate.

  ADVANTAGE OF THE INVENTION According to this invention, when forming a through-hole in a resin film, the punching tool which can collect | recover punching waste reliably with a comparatively simple structure can be provided. Also, a method for punching a resin film using the punching tool can be provided.

It is sectional drawing of the punching tool which concerns on one Embodiment of this invention. It is a figure which shows the punching method using the punching tool of FIG. It is a figure which shows the punching method using the punching tool of FIG. It is a figure which shows the punching method using the punching tool of FIG. It is a figure which shows the punching method using the punching tool of FIG. It is a figure which shows the punching method using the punching tool of FIG. It is a figure which shows the aspect which continuously processes a polarizing plate using the punching processing apparatus provided with the punching tool of FIG. It is a figure showing the surface protection film obtained by the punching method of the present invention.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In each of the drawings, the same or corresponding portions have the same reference characters allotted, and overlapping description will be omitted. Also, the dimensional ratios of the components are exaggerated for easy understanding of the invention.

  In the present invention, the “resin film” does not matter whether it is a single-layer film or a laminated film layer. When the “resin film” is composed of a plurality of film layers (laminated film), the resin film may include an adhesive layer or a pressure-sensitive adhesive layer that bonds the respective film layers.

  Hereinafter, as a specific example, a laminated film having an adhesive layer and a polarizing plate as a resin film, a punching tool for forming a through hole in the laminated film, and a punching method using the same will be described. Here, the laminated film is provided with a release sheet in order to prevent foreign substances and the like from the external environment from adhering to the pressure-sensitive adhesive layer. Such a laminated film in which the polarizing plate is provided with the pressure-sensitive adhesive layer and the release sheet is hereinafter referred to as a “polarized plate laminated film”.

<Punching tools>
As shown in FIG. 1, the punching tool 1 includes a plate-shaped flat body (support) 2, a cylindrical blade die 3, and a first elastic body 4 a housed inside the blade die 3. And The blade mold 3 has a blade edge 3 a at one end (lower side in the figure), and the other end is connected to the flat plate 2. The flat body 2 and the blade mold 3 are both made of metal, and their mutual attachment is performed by, for example, an adhesive or welding. In FIG. 1, the end of the first elastic body 4 a in the cylindrical axial direction, which is farther from the flat plate 2, which is a preferred embodiment of the punching tool of the present invention, is located at a position closer to the cutting edge. 3 also shows a plate located far from the flat plate 2. The punching tool 1 shown in FIG. 1 further includes a second elastic body 4b. Also in the second elastic body 4b, a flat plate is formed at the end of the second elastic body 4b in the axial direction of the cylinder. The end farther from the plate 2 is located farther from the flat plate 2 than the position of the cutting edge.

  The outer diameter of the blade mold 3 is constant over the entire axial direction (vertical direction in the drawing) of the blade mold 3. When the through hole to be formed in the polarizing plate is substantially circular, the outer diameter of the blade mold 3 may be considered in consideration of the diameter, and may be 0.5 mm to 5 mm, or 1 mm to 4 mm. Or 2 mm to 3 mm.

  The blade mold 3 has a blade portion 3b on one end side. The blade portion 3b includes a blade edge 3a that comes into contact with the polarizing plate laminated film when forming a through hole in the polarizing plate laminated film. The thickness of the blade portion 3b is changed so that the inner diameter gradually decreases from one end to the other end. Further, it is preferable that this blade portion 3b is a so-called single blade. In other words, the tip of one end of the blade mold 3 (that is, the cutting edge 3a) has the largest inner diameter, and the diameter decreases toward the other end, and the inner diameter decreases. The inner diameter is constant at the other end of the blade mold 3.

  Since the blade portion 3b has the above-mentioned variable thickness, the blade mold 3 has a portion in which the inner wall is inclined with respect to the axial direction in the longitudinal section (the state shown in FIG. 1). I have. The inclination may be 20 ° to 50 °, 25 ° to 45 °, or 30 ° to 40 ° with respect to the axis. This inclination angle is set to an appropriate angle depending on properties such as elasticity and thickness of the target polarizing plate laminated film.

  The length in the axial direction of the blade mold 3 is preferably 1 mm to 7 mm, and more preferably 1.3 mm to 5 mm. The length in the axial direction of the blade portion 3b (the portion inclined by the change in thickness as described above) is preferably from 0.04 mm to 2 mm, and more preferably from 0.2 mm to 1 mm. Further, the inner diameter of the other end side of the blade mold 3 is preferably 70% to 95%, more preferably 75% to 90% of the inner diameter of the cutting edge 3a.

The first elastic body 4a is an elastic member housed inside the blade mold 3, and has, for example, a columnar shape. The first elastic body 4a has one end (lower side in the figure) at a position farther from the flat plate body 2 than the position of the cutting edge 3a of the blade mold 3, and has the other end (upper side in the figure). It is adhered to the flat plate 2. That is, the length (the height of the columnar shape) of the first elastic body 4a is longer than the length of the blade die 3, and the excess length protrudes from the blade edge 3a beyond the position of the blade edge 3a. The length L ₁ of the portion where the first elastic member 4a is jumping out from the cutting edge 3a, as will be described later, in the scene where the through hole in the polarizing plate is formed, the ends of the first elastic member 4a is the cutting edge 3a Although it can be set in a range approaching the position, it is preferably more than 0 mm and 2 mm or less, more preferably 0.2 mm to 1.5 mm.

  The first elastic body 4a has elasticity capable of contracting when pressure is applied to the plate body 2 in the axial direction of the blade mold 3, and has an end (one side) remote from the plate body 2. Can move to a position closer to the plate body 2 than the position of the cutting edge 3a. Then, when the pressure is released, it can return to the original shape.

  As shown in FIG. 1, the punching tool 1 of the present embodiment may further include a second elastic body 4 b around the blade mold 3 and on the flat plate 2. Among the ends of the second elastic body 4b in the axial direction of the cylindrical shape of the blade die 3, the end farther from the flat plate 2 is located farther from the flat plate 2 than the position of the cutting edge 3a. The elastic body 4b contracts when pressure is applied to the flat body 2 in the axial direction, and can move the end farther from the flat body 2 to a position closer to the flat body 2 than the position of the cutting edge. . As described above, the second elastic body can prevent the worker from directly touching the cutting edge 3a of the blade mold 3 when the punching tool of the present embodiment is left stationary, and as described above, the safety of the worker can be improved. There is also an advantage that the property can be secured.

  The second elastic body 4b is a member arranged around the blade mold 3 and on the flat plate 2, and extends over a wide range along the surface of the flat plate 2. The shape of the second elastic body 4b is such that, from the viewpoint of holding down the polarizing plate laminated film at the time of punching, the surface of the end portion far from the flat body 2 has a planar shape substantially perpendicular to the axial direction of the cylindrical shape of the blade 3. It is more preferable that the entire shape of the second elastic body 4b is substantially the same as that of the polarizing plate laminated film to be punched. Note that, in this case, the shape of the second elastic body 4b is plate-like in the same manner as the flat body 2, but the dimensional expression of the second elastic body 4b in this specification is the dimension of the first elastic body 4a. Similarly to the expression, the dimension in the axial direction (vertical direction in the drawing) of the blade mold 3 having a cylindrical shape is expressed as “length”, and both ends in the axial direction are expressed as “ends”. I have.

The second elastic body 4b has one end (lower side in the figure) farther from the flat plate body 2 than the position of the cutting edge 3a of the blade mold 3, and has the other end (upper side in the figure) flat. Adhered to body 2. That is, the length (thickness) of the second elastic body 4b is longer than the length of the blade die 3, and the excess length protrudes from the blade edge 3a beyond the position of the blade edge 3a. The length L ₂ at a position where the second elastic member 4b is jumping out from the cutting edge 3a is preferably smaller than the length L ₁ of the case of the first elastic member 4a. If punching tool 1 comprises a second elastic member 4b, the length _{L 2} is appropriately set according to the length _{L 1} of the first elastic member, _{L 2} is at 0mm or 1.5mm or less Preferably, it is 0.2 mm to 1 mm.

  Like the first elastic body 4a, the second elastic body 4b has elasticity capable of contracting when pressure is applied to the flat body 2 in the axial direction of the blade mold 3, and The end far from the end 2 (one end) can move to a position closer to the plate body 2 than the position of the cutting edge 3a. Then, when the pressure is released, it can return to the original shape.

  The material of the first elastic body 4a and the second elastic body 4b is preferably a rubber material. Such a rubber material is made of synthetic rubber (for example, SBR (styrene-butadiene rubber)) or natural rubber (RSS). Either may be used. Both the first elastic body 4a and the second elastic body 4b are preferably solid, and may be in the form of a sponge having a network structure so that it is easy to repeat contraction and elongation according to pressure. preferable.

  The hardness of each of the first elastic body 4a and the second elastic body 4b is preferably 25 to 50, and more preferably 30 to 45. With this hardness, it is easy to shrink when pressure is applied, and it is easy to return to the original shape when the pressure is released. This hardness can be measured by a rubber hardness tester (manufactured by Kobunshi Keiki Co., Ltd.) based on the physical test method of expanded rubber of SRIS0101 of the Japan Rubber Association Standard.

  One end of each of the first elastic body 4a and the second elastic body 4b is a plane substantially orthogonal to the axial direction of the blade mold 3. Further, it is preferable that a surface portion that comes into contact with the polarizing plate laminated film at the time of punching the polarizing plate laminated film is subjected to a release treatment. Examples of the release treatment include fine irregularities, Teflon tape, and coating. The release treatment facilitates separation after coming into contact with the polarizing plate laminated film. The fine irregularities include, for example, a plurality of hemispherical protrusions having a height of about 1 mm and a diameter of about 1.5 mm.

<Punching method>
Hereinafter, a preferred embodiment of the present invention, a punching method for forming a through hole in a polarizing plate laminated film using the punching tool 1 shown in FIG. 1 will be described. As shown in FIG. 2, a patch plate 20 having a horizontal surface is placed on a press machine table, and the polarizing plate laminated film 10 is placed thereon. Here, the polarizing plate laminated film 10 has an adhesive layer and a release sheet on one side of a polarizing plate in which a protective film is laminated on one side or both sides of the polarizing film. When attaching a polarizing plate to a display device or the like, the release sheet is peeled off and attached by the adhesive force of the adhesive layer. Even in the case where the through-hole is formed in the polarizing plate laminated film having the pressure-sensitive adhesive layer and the release sheet as described above, the use of the punching tool 1 of the present embodiment makes it possible to sufficiently collect the punched chips and obtain high-quality polarized light. Boards can be manufactured. The size of the polarizing plate laminated film 10 is preferably an area is 700cm ² ~10000cm ^2, more preferably 1000cm ² ~5000cm 2. The total thickness of the polarizing plate laminated film 10 is preferably from 100 μm to 500 μm, and more preferably from 150 μm to 300 μm.

  The backing plate 20 is preferably made of a material having such an elastic force that the blade edge 3a is buried when the blade edge 3a of the blade mold 3 comes into contact. Examples of the material of the backing plate 20 include resin materials such as polyethylene, polycarbonate, and polyethylene terephthalate. The thickness of the backing plate 20 is preferably larger than the thickness of the polarizing plate laminated film 10, and is preferably 0.5 mm to 4 mm.

  The surface of the backing plate 20 on which the polarizing plate laminated film 10 is placed has a static friction coefficient of preferably 0.3 or less, more preferably 0.2 or less. When the coefficient of static friction of the surface on which the polarizing plate laminated film 10 is placed is within this range, the polarizing plate laminated film 10 is placed on the backing plate 20 and the polarizing plate laminated film 10 is removed from the backing plate 20. Removal becomes easier, and when punching waste is generated, removal of the punching waste becomes easier. This static friction coefficient can be measured by a portable friction meter (model 94i-2 manufactured by Shinto Kagaku Co., Ltd.).

  Then, as shown in FIG. 2, the punching tool 1 is arranged vertically above the backing plate 20 and the polarizing plate laminated film 10 (arrangement step). At this time, the blade edge 3a faces the polarizing plate laminated film 10, and in the axial direction (vertical direction in the drawing) of the blade mold 3, the axial direction is substantially orthogonal to the surface of the polarizing plate laminated film 10. Tool 1 is arranged as described above.

Next, as shown in FIG. 3, the punching tool 1 is lowered toward the polarizing plate laminated film 10 by a press pressure to approach it. Figure 3 shows a moment when the first elastic member 4a is in contact with the surface of the polarizing plate laminated film 10, the end of the by the length L ₁ at this point the first elastic member 4a is above the cutting edge 3a The edge 3a is not yet in contact with the polarizing plate laminated film 10 because the cutting edge 3a is far from the flat plate 2 (that is, close to the polarizing plate laminated film 10). The pressing pressure can be adjusted within a range where the first elastic body 4a shrinks and a through hole can be formed in the polarizing plate laminated film 10.

When the punching tool 1 is further lowered from here, pressure is applied to the first elastic body 4a from the polarizing plate laminated film 10 side to the flat plate body 2 side, and the first elastic body 4a contracts in the axial direction. At the same time, the end of the second elastic body 4b comes into contact with the polarizing plate laminated film 10. Since this by the length L ₂ is at the end of the second elastic member 4b is far from the flat plate 2 than the cutting edge 3a (i.e. closer to the polarizing plate laminated film 10), the cutting edge 3a is still polarizing plate laminated film 10 Not in contact with

  Then, when the punching tool 1 is further lowered, pressure is applied to the second elastic body 4b from the polarizing plate laminated film 10 side to the flat body 2 side, and the second elastic body 4b contracts in the axial direction. At the same time, the cutting edge 3a comes into contact with the polarizing plate laminated film 10. Then, the punching tool 1 is further advanced to move the cutting edge 3a into the polarizing plate laminated film 10, and the cutting edge 3a reaches the contact plate 20 (FIG. 4). As a result, the polarizing plate laminated film 10 is pushed off by the blade mold 3, and the portion of the polarizing plate laminated film 10 located in the blade mold 3 is separated from the polarizing plate laminated film 10 to become punched waste 10 a and the polarized light is removed. A through hole 10b is formed in the plate laminated film 10 (punching step; see FIG. 6 for the state of the through hole 10b).

Thereafter, the punching tool 1 is raised. As the punching tool 1 is raised, the first elastic body 4a and the second elastic body 4b return to their original shapes due to their elasticity. FIG. 5 shows the moment when the punching tool 1 is raised to a height at which the shape of the first elastic body 4a can be completely restored (separation step). In the process of raising the punching tool 1, the polarizing plate laminated film 10 is pressed against the backing plate 20 by the elasticity of the second elastic body 4b, and the blade 3a, the polarizing plate laminated film 10 and when the distance is greater than the length L _2, the pressing is completed. Further, the punching scrap 10a is pressed against the contact plate 20 by elasticity of the first elastic member 4a, exceeds the distance length L ₁ between the cutting edge 3a and the polarizer laminated film 10 by the rising of the punching tool 1 subsequent At this point, the pressing is finished. As a result, the punching tool 1 is separated from the polarizing plate laminated film 10, and the polarizing plate laminated film 10 and the punched waste 10 a are left on the backing plate 20.

  Then, after further raising the punching tool 1, as shown in FIG. 6, the polarizing plate laminated film 10 in which the through holes 10b are formed is removed from the backing plate 20. At this time, the blank 10a remains on the backing plate 20. Finally, the blanks 10a are removed from the backing plate 20, and then the polarizing plate laminated film 10 in which a through hole is to be formed is placed. By repeating the above procedure, punching of the polarizing plate laminated film 10 can be continuously performed. One embodiment for continuous punching will be described later.

  According to the punching tool 1 configured as described above and the punching method using the same, the first elastic body 4a comes into contact with the polarizing plate laminated film 10 before the cutting edge 3a of the blade mold 3, and then The blade edge 3a comes into contact with the polarizing plate laminated film 10 while the first elastic body 4a is contracted by pressure. Thereafter, when the blade die 3 is pulled out after the through hole 10b is formed, the first elastic body 4a extends so as to return to the original shape in accordance with the pulling out of the blade die 3, and the blade edge 3a becomes the polarizing plate laminated film 10 From the polarizing plate laminated film 10 with a delay from moving away from the polarizing plate. That is, the first elastic body 4a plays a role of holding down the punched chips 10a until the blade mold 3 separates from the polarizing plate laminated film 10. This prevents the punching waste 10a from adhering to the blade mold 3 and being pulled up, and the punching waste 10a remains on the backing plate 20 on which the polarizing plate laminated film 10 is placed. Therefore, the punching waste 10a is not scattered on the polarizing plate laminated film 10, and the punching waste 10a does not enter the blade mold 3 and remain in the blade mold 3, so that the punching waste 10a can be collected. It can be done reliably.

  Similarly to the case where the first elastic body 4a plays a role of holding down the punched chips 10a until the blade mold 3 separates from the polarizing plate laminated film 10, the second elastic body 4b serves as the polarized light around the punched chips 10a. It serves to hold the plate laminated film 10. Thereby, the position of the polarizing plate laminated film 10 can be stabilized at the time of punching, and the polarizing plate laminated film 10 as well as the punching waste 10a reliably stays on the backing plate 20 originally placed, Scattering of the punched waste 10a due to mutual displacement is prevented.

Further, this embodiment (punching method using a punching tool 1 shown in FIG. 1), the elastic member 4a, the pop-out length of the portion 4b is jumping out from the cutting edge 3a, since there is a L _1> L _2, In both the punching step and the separation step, the punched chips 10a are held longer by the elastic body than the polarizing plate laminated film 10, and the punched chips 10a are more likely to stay at the mounting position than the polarizing plate laminated film 10. Becomes stronger. Therefore, when the polarizing plate laminated film 10 is removed first after the punching, the punching waste 10a is prevented from being dragged and scattered by the polarizing plate laminated film 10.

  Further, in the above-described punching method, since the cutting edge 3a of the blade die 3 penetrating the polarizing plate laminated film 10 reaches the backing plate 20, the through holes 10b can be formed in the polarizing plate laminated film 10 reliably. .

  Further, in the above-described punching method, since the punching tool 1 is disposed on the upper side in the vertical direction and the polarizing plate laminated film 10 is disposed on the lower side in the vertical direction, for example, when the polarizing plate laminated film 10 is continuously supplied, Since the polarizing plate laminated film 10 can be easily placed on and removed from the backing plate 20 while being transported in the horizontal direction, there is an advantage that a production line for performing continuous punching can be easily assembled.

<Continuous punching method>
Hereinafter, a method for continuously punching a polarizing plate will be described. FIG. 7 shows an embodiment in which through holes are continuously formed in a long polarizing plate laminated film using a punching device.

  The long polarizing plate laminated film 10Q is unwound from the polarizing plate laminated film roll 10P in a state where the long polarizing plate laminated film 10Q is wound around the core 40, and is conveyed onto the backing plate 20P. The backing plate 20P is formed in an endless shape and is stretched over two rolls 30. By rotating the rolls 30, the backing plate 20P can continuously travel in the transport direction of the polarizing plate laminated film 10Q. The punching apparatus 100 to which the punching tool 1 is attached is opposed to the backing plate 20P via the polarizing plate laminated film 10Q.

  By performing punching (drilling) by the punching apparatus 100, a polarizing plate laminated film 10R in which the through holes 10b are formed and punched chips 10a are obtained. The punching apparatus 100 is provided with a cutting mechanism that cuts out a sheet-shaped polarizing plate laminated film (polarizing plate laminated film chip) from the long polarizing plate laminated film 10Q while forming the through hole 10b. Is also good.

  Next, the punched polarizing plate laminated film 10R (the polarizing plate laminated film provided with the through holes 10b) after the punching is separated from the backing plate 20P by an appropriate transfer device 50. The transfer device 50 may be a device that sucks the polarizing plate laminated film 10R by a suction cup or a device that sucks the polarizing plate laminated film 10R by a decompression function. A transfer machine provided with a decompression function is preferable in terms of easy desorption.

  Even after the polarizing plate laminated film 10R is separated from the backing plate 20P by the transfer device 50, the punch 30 remaining on the backing plate 20P is transported by continuing the rotation of the roll 30. The punched waste 10a is peeled off from the backing plate 20P by the peeling device 60 provided at the traveling destination of the backing plate 20P, and is collected in the collection box 70. The peeling device 60 is not particularly limited as long as it can separate the punched debris 10a from the backing plate 20P and does not significantly damage the backing plate 20P. A sharp angle jig may be provided to assist the separation.

  In the continuous punching method, for example, the long polarizing plate laminated film 10Q is cut into a large-sized sheet (a polarizing plate chip larger than a predetermined polarizing plate outer shape) before punching, and punching is performed by the punching apparatus 100. After that, it may be cut into a desired outer shape. Moreover, you may cut | disconnect to a desired outer shape from the long polarizing plate laminated film in which the several through-hole 10b was provided.

  As described above, the preferred embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, in the above-described embodiment, the aspect in which the blade mold 3 has a cylindrical shape has been described, but the blade mold 3 may have a polygonal cross section. In this case, the outer diameter of the blade mold 3 indicates the maximum diameter of the polygonal shape.

  Further, in the above-described embodiment, the plate-shaped flat body 2 is shown as a support for fixing the blade mold 3. However, if the blade mold 3 can be fixed and can be fixed to a press machine, the support may be used. The body may have other shapes.

  Further, in the above-described embodiment, the first elastic body 4a and the second elastic body 4b have been described as having a mode in which one end portion is flat, but the pressing of the polarizing plate laminated film 10 and the subsequent separation are not performed. For the purpose of adjusting easiness, the end may have a spherical surface or another shape.

Further, in the above-described embodiment, of the ends of the first elastic body 4a in the axial direction of the cylindrical blade die 3, the end of the first elastic body 4a farther from the flat plate 2 is farther from the flat plate 2 than the position of the cutting edge 3a. Although the mode at the position (that is, L ₁ > 0 mm) is shown, the position of the end may be substantially the same as the position of the cutting edge 3a. Here, “substantially the same” means that L ₁ is within ± 10% of the axial length of the blade mold 3.

Further, in the above-described embodiment, of the ends of the second elastic body 4b in the axial direction of the cylindrical blade die 3, the end of the second elastic body 4b farther from the flat plate 2 is farther from the flat plate 2 than the position of the cutting edge 3a. Although the mode at the position (that is, L ₂ > 0 mm) is shown, the position of the end may be substantially the same as the position of the cutting edge 3a. Here, "substantially the same" includes, as in the case of L _1, refers to the axial direction length of L ₂ is cutting die 3, within about 10% ±.

  In the above-described embodiment, the polarizing plate laminated film 10 has an embodiment in which a polarizing film, a protective film, an adhesive layer, and a release sheet are laminated. However, the polarizing plate laminated film 10 is formed by laminating another optical functional film. It may be done.

  In the above-described embodiment, the mode in which the punching tool 1 and the polarizing plate laminated film 10 are arranged and then the punching tool 1 is lowered toward the polarizing plate laminated film 10 is shown. May overlap. For example, the arrangement and the lowering may be started at the same time, and the arrangement may be completed immediately before the cutting edge 3a contacts the polarizing plate laminated film 10.

  Further, in the above embodiment, the mode in which the positions of the polarizing plate laminated film 10 and the patch 20 are fixed and the punching tool 1 is moved has been described, but the polarizing plate laminated film 10 and the patch 20 and the punching tool 1 are relatively moved. As long as the punching tool 1 can be moved so as to approach, for example, the arrangement of the punching tool 1 may be fixed, and the polarizing plate laminated film 10 and the backing plate 20 may be moved.

  Further, a target to which the punching tool and the punching method of the present invention are applied may be a surface protective film instead of the polarizing plate laminated film. That is, as described in the background art, the punching tool and the punching method of the present invention can be applied to a long surface protective film for providing a decolorizing part in a polarizing film. As shown in FIG. 8, the surface protective film 200 penetrates a long film at a predetermined interval (in FIG. 8, a predetermined interval in the longitudinal (long) direction and the width direction of the long film). A hole 10b is provided. The surface protection film 200 has a pressure-sensitive adhesive layer for bonding to a long polarizing film and a release sheet for protecting the pressure-sensitive adhesive layer. Such a surface protective film may be obtained by replacing the film before providing the through-holes with the long surface protective film (in which the through-holes are formed) in the punching apparatus shown in FIG. (Not shown), and the punching apparatus 100 may be configured so as not to have a mechanism for cutting a sheet-like film. According to the punching apparatus 100 without a mechanism for cutting a sheet-like film, a long surface protective film 200 (having the through holes 10b at predetermined intervals) can be manufactured. Also in the production of, it is possible to sufficiently prevent the punching waste 10a from adhering to the surface of the surface protection film 200.

  INDUSTRIAL APPLICATION This invention can be utilized for the punching process which forms a through-hole in a resin film.

DESCRIPTION OF SYMBOLS 1 ... Punching tool, 2 ... Flat body (support), 3 ... Blade type, 3a ... Blade tip, 3b ... Blade part, 4a ... 1st elastic body, 4b ... 2nd elastic body, 10 ... Polarizing plate, 10a ... punching waste, 10b ... through holes formed in the polarizing plate, 10P ... polarizing plate laminated film roll, 10Q ... long polarizing plate laminated film, 10R ... polarizing plate laminated film having through holes formed in continuous processing, 20 ... Patch plate, 20P ... Put plate capable of continuous running, 30 ... Roll, 40 ... Core, 50 ... Transfer machine, 70 ... Recovery box, 100 ... Punching device, 200 ... Long surface protection film (predetermined There is a through hole at the interval).

Claims (9)

A punching tool for forming a through hole in a resin film,
A support,
A blade having a cylindrical shape, having a cutting edge at one end and having the other end coupled to the support;
A first elastic body housed inside the blade mold,
Among the ends of the first elastic body in the axial direction of the cylindrical shape, the end farther from the support is located at substantially the same position as the position of the cutting edge, or the position of the support is higher than the position of the cutting edge. It is far from your body,
The first elastic body shrinks when pressure is applied to the support in the axial direction, and the end farther from the support is closer to the support than the position of the cutting edge. all SANYO, which can be moved up,
Further comprising a second elastic body disposed around the blade mold and on the support,
Among the ends of the second elastic body in the axial direction of the cylindrical shape, an end farther from the support is located at substantially the same position as the position of the cutting edge, or the position of the supporting edge is higher than the position of the cutting edge. It is far from your body,
The second elastic body contracts when pressure is applied to the support in the axial direction, and the end portion farther from the support is closer to the support than the position of the cutting edge. Can be moved up to
The end of the first elastic body that is farther from the support in the axial direction is the end of the second elastic body that is farther from the support in the axial direction. than the end, Ru farther near from the support, punching tools.   2. The punch according to claim 1, wherein an end of the first elastic body that is farther from the support in the axial direction of the cylinder is located farther from the support than the position of the cutting edge. 3. Tools. End of the side away from the support of the end portion of the second elastic member in the axial direction of the cylindrical shape, located far from the support than the position of the cutting edge, according to claim 1 or 2, wherein Punching tools. The end remote from the support of the ends of the first elastic body, the surface is release-treated, punching tool according to any one of claims 1-3. The punching tool according to any one of claims 1 to 4 , wherein an outer diameter of the cutting edge is 5 mm or less. The punching tool according to any one of claims 1 to 5 , wherein each of the first elastic body and the second elastic body has a hardness of 25 to 50. The punching tool according to any one of claims 1 to 6 , wherein the resin film includes a pressure-sensitive adhesive layer and a release sheet. A punching method for forming a through-hole in the resin film using the punching tool according to any one of claims 1 to 7 ,
In the axial direction of the cylindrical shape, an arrangement step of facing the blade mold with the resin film and the abutment plate arranged so as to be orthogonal to the axial direction,
The resin film and the blade mold are relatively approached and contacted in the axial direction, and the resin film is pushed and cut off by the blade mold as the first elastic body shrinks in the axial direction. A punching step of forming a through hole;
A separating step of relatively separating the resin film and the backing plate from the blade mold in the axial direction, and leaving punched chips generated by forming the through holes on the backing plate. Method. 9. The punching method according to claim 8 , wherein a static friction coefficient of a surface of the backing plate is 0.3 or less.

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