JP2009214245A - Drilling method for plastic film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drilling method for a plastic film capable of preparing a hole near perfect circle by suppressing generation of a burr at a periphery of the hole and further maintaining thickness by suppressing swelling of the film at a periphery of the hole. <P>SOLUTION: A first plastic sheet 18, a plastic film 19 to be drilled and a second plastic sheet 20 are superposed on a transparent working base 11 in the order. On an upper surface of the second plastic sheet 20, a pressing plate 17 having a through-hole 21 having a larger diameter than the hole is placed such that the through-hole 21 surrounds a hole formation position of the plastic film 19. Subsequently, after crushed dry ice 22 is filled in the through-hole 21 of the pressing plate 17, a drill 16 is descended through the through-hole 21 of the pressing plate 17 and the hole is formed on the plastic film 19. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for punching a plastic film that can make a minute hole close to a perfect circle in a thin plastic film.

  In order to evaluate the performance of a plastic film, it may be necessary to make a small hole with a diameter of 1 mm or less in a thin plastic film with a thickness of 30 μm or less. When this hole is drilled, burrs are generated around the hole, making it difficult to obtain a true circular hole. This hinders the performance evaluation of the plastic film. Therefore, for example, a processing sheet made of a thermoplastic resin disclosed in Patent Document 1 is placed on a plastic film, and a hole is drilled from the processing sheet, or a drill as disclosed in Patent Document 2 is used. Instead, a method of making a hole by laser irradiation has been proposed.

JP 2003-80498 A JP 11-342492 A

  When a hole is made in a plastic film using the processing sheet disclosed in Patent Document 1, the effect of suppressing the generation of burrs around the hole by the processing sheet is small, and it is difficult to obtain a true circular hole. It was. When a hole is made in a plastic film by laser irradiation disclosed in Patent Document 2, a burr is not generated and a true circular hole is obtained, but the plastic film around the hole is raised by the heat of the laser due to the plasticity of the plastic film. Therefore, it is difficult to maintain the thickness of the plastic film.

  The present invention has been made in view of the above problems, and can suppress the generation of burrs around the hole and create a hole close to a perfect circle, and further suppress the bulge of the film around the hole to maintain the thickness. It is an object to provide a method for drilling a plastic film.

  The method for drilling a plastic film according to the present invention is a method of drilling a hole in a plastic film, wherein the first sheet, the plastic film and the second sheet are laminated in this order on a support base, On the upper surface of the second sheet, a pressing plate having a through hole larger in diameter than the hole is placed, and while cooling the plastic film and the drill, the drill is lowered through the through hole of the pressing plate, It is characterized in that a hole is made in a plastic film.

  In particular, it is preferable to fill the through hole of the pressing plate with a coolant and cool the drill and the plastic film with the coolant.

  The thickness of the first sheet is preferably 3 to 10 mm, and the thickness of the second sheet is preferably 0.05 to 0.5 mm.

  Further, after making a hole in the plastic film, the hole may be photographed from the front side and the back side of the plastic film to check the accuracy of the hole.

In the method for punching a plastic film according to the present invention, since the plastic film is sandwiched between the first and second sheets and the holes are held by the pressing plate from above, the holes around the hole are burred. It is possible to obtain a hole that is close to a perfect circle, and the hole is drilled while cooling the plastic film and drill. Therefore, the generation of heat during drilling is suppressed, and the bulge of the plastic film is suppressed to increase the thickness. Can be suppressed.
Therefore, the drilling method of the present invention is suitable for drilling holes having a diameter of 1 mm or less with a drill in a thin plastic film having a thickness of 30 μm or less.

  Hereinafter, a method for punching a plastic film according to the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view showing a method for punching a plastic film according to an embodiment of the present invention, and FIG. 2 is a schematic explanatory view showing an example of an apparatus configuration for carrying out the punching method.

  As shown in FIG. 1, in this drilling method, a first plastic sheet 18 (first sheet), a plastic film 19 for drilling holes, and a second plastic sheet 20 are formed on a transparent work table 11 (support base). The pressing plate 17 having a through hole 21 having a diameter larger than the hole is formed on the upper surface of the second plastic sheet 20 (second sheet), and the through hole 21 forms the hole of the plastic film 19. Then, after the dry ice 22 (coolant) is filled in the through hole 21 of the holding plate 17, the drill 16 is lowered through the through hole 21 of the holding plate 17 to make a plastic film. 19 is a hole.

  The material of the plastic film 19 for making a hole is not particularly limited. For example, polyethylene terephthalate resin (PET), ethylene vinyl acetate resin (EVA), polyester resin (PET), nylon resin (PA), polychlorinated Vinyl resin (PVC), polyvinyl alcohol resin (PVA), Teflon (registered trademark) resin (PTFF), polystyrene resin (PS), methacrylic resin (PMMA), polypropylene resin (PP), polyacrylonitrile resin (PAN), polyethylene resin Various thermoplastic resins such as (PE) can be mentioned. The thickness of the plastic film 19 to be used is, for example, 30 μm or less, particularly 10 to 30 μm, but is not particularly limited.

  The first and second plastic sheets 18 and 20 can be made of the same material as the plastic film 19. The first plastic sheet 18 receives the drill 16, and the thickness is not particularly limited, but may be about 3 to 10 mm, and may be a hard sheet. The second plastic sheet 20 is composed of a hard sheet and preferably has a thickness of 0.05 to 0.5 mm. If the thickness is less than 0.05 mm, it is difficult to suppress the generation of burrs. . In place of the plastic sheets 18 and 20, rubber sheets, wood sheets, or the like may be used.

  The holding plate 17 serves as a weight for bringing the plastic sheets 18 and 20 into close contact with both surfaces of the plastic film 19. For this reason, it is preferable to use a relatively heavy metal plate, glass plate, rubber plate, plastic plate, or the like as the pressing plate. Moreover, it is preferable that the through hole 21 provided in the pressing plate 17 has a diameter of 2 to 10 mm. The thickness of the pressing plate 17 is preferably 2 mm or more so that the coolant can be filled into the through hole.

  As shown in FIG. 2, the apparatus for carrying out the drilling method according to this embodiment includes a feed roll 10 for the plastic film 19 for punching holes, a roll 14 for winding the plastic film 19, and a gap between them. A transparent worktable 11 provided; a machine tool 12 installed above the transparent worktable 11 and fitted with a drill 16; and the transparent worktable located on the downstream side in the transport direction of the plastic film 19 with respect to the machine tool 12 11 and microscopes 13 and 13 'installed above and below, respectively.

  The transparent worktable 11 is, for example, a transparent glass plate or a transparent plastic plate. The drill 16 attached to the machine tool 12 is not particularly limited. For example, when drilling a small diameter of about 0.1 to 3 mm, it is preferable to use a luma type drill.

  The microscopes 13, 13 ′ are installed to observe the holes in the plastic film 19 made with the drill 16 and confirm the shape of the holes and the degree of damage around the holes. That is, a CCD camera (not shown) is attached to the microscopes 13 and 13 '. The CCD camera is connected to the monitors 15 and 15', and the enlarged images 23 and 23 'of the photographed holes are displayed on the monitors 15 and 15'. It is configured to display. Thereby, the drilling accuracy can be easily confirmed from both surfaces of the plastic film 19.

  In order to make a hole in a predetermined position of the plastic film 19, the first plastic sheet 18 is placed on the transparent work table 11, and then the feeding roll 10 and the take-up roll 14 are driven, and the first plastic sheet 19 is driven. The punched portion of the plastic film 19 is conveyed to the upper surface of the plastic sheet 18 and both rolls 10 and 14 are stopped. Next, the second plastic sheet 20 is placed on the upper surface of the plastic film 19 on the first plastic sheet 18, and the pressing plate 17 is placed so that the through hole 21 surrounds the hole forming position of the plastic film 19. Place.

  After that, the finely pulverized dry ice 22 is filled in the through hole 21 of the holding plate 17. If there is no problem even if the plastic film 19 absorbs water, ice or the like may be used as the coolant instead of the dry ice 22.

  The reason why the coolant such as dry ice 22 is used is to prevent the plastic film 19 from excessively generating heat when drilling and scorching and raising the peripheral portion of the hole. Therefore, the plastic film 19 is cooled by a coolant such as dry ice 22 and the drill 16 is also cooled. Preferably, after the drill 16 is cooled by slowly lowering the drill 16 or by temporarily stopping the tip of the drill 16 in contact with the dry ice 22 for several seconds (about 1 to 10 seconds). Then, the plastic film 19 is drilled.

  After the hole is made in the plastic film 19, the holding plate 17 and the second plastic sheet 20 are removed, and the rolls 10 and 14 are driven so that the holed portion of the plastic film 19 is moved to a position facing the microscopes 13 and 13 '. The holes made in the plastic film 19 are observed from the front and back surfaces by the two microscopes 13 and 13 ', and the enlarged images 23 and 23' of the holes are displayed on the monitors 15 and 15 'by a CCD camera (not shown). The accuracy of drilling the plastic film 19 is confirmed.

  EXAMPLES Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to the following examples.

A luma drill (manufactured by Kanamori Drill Co., Ltd.) having a blade diameter of 0.6 mm was attached to the drilling machine. On the transparent work table, a first plastic sheet (methacrylic resin sheet having a thickness of 5 mm), a plastic film (polyethylene resin (PE) film having a thickness of 20 μm), and a second plastic sheet (polyvinyl chloride having a thickness of 100 μm). A resin (PVC) film) was laminated, and a donut-shaped pressing plate (thickness 2 mm, weight 20 g) having a through hole with a diameter of 1 cm was placed thereon.
Next, the through hole of the holding plate was filled with finely pulverized dry ice, and the tip of the drill was brought into contact with the dry ice in the through hole for 10 seconds to cool the plastic film and the drill. After cooling, the drill was driven to slowly descend the through hole of the pressing plate, and a hole with a diameter of 0.6 mm was made in the plastic film.

(Comparative Example 1)
A hole was made in the plastic film in the same manner as in Example 1 except that the pressing plate, the first plastic sheet, and the second plastic sheet were not used, and the plastic film and the drill were not cooled.

(Comparative Example 2)
A hole was made in the plastic film in the same manner as in Example 1 except that the plastic film and the drill were not cooled.

(Comparative Example 3)
Except for using the excimer laser irradiation device instead of the drill without using the holding plate, the second plastic sheet, and the first plastic sheet, and further cooling the plastic film. A hole with a diameter of 0.6 mm was made in the plastic film in the same manner as in Example 1.

(Evaluation methods)
A plastic film was placed on a transparent work table, and the holes made in the plastic film of Example 1 and Comparative Examples 1 to 3 were photographed from the front side and the back side with two microscopes. An evaluation of the drilling accuracy was performed by displaying an enlarged image of. These results are shown in Table 1.

  As is clear from Table 1, in Comparative Example 1 in which holes were drilled without using the first and second plastic sheets and the holding plate and without cooling, the holes were burred and the shape of the holes was deformed. It was non-round. In Comparative Examples 1 and 2 in which holes were drilled without cooling the plastic film and the drill blade, there was a change in the thickness of the plastic film around the holes.

On the other hand, in Comparative Example 3 in which holes were formed with a laser, no burrs were generated in the holes, and the shape of the holes was a perfect circle, but there was a change in the thickness of the plastic film around the holes.
On the other hand, in Example 1, no burr was generated in the hole, the shape of the hole was a perfect circle, and the change in the thickness of the plastic film around the hole could hardly be confirmed with a laser microscope, so there was no change. It was determined.

It is a schematic explanatory drawing which shows one Embodiment of the drilling method which concerns on this invention. It is a schematic explanatory drawing which shows an example of the apparatus structure for enforcing the drilling method of FIG.

Explanation of symbols

10: Feeding roll 11: Transparent work table 12: Machine tool 13: Microscope 14: Winding roll 15: Monitor 16: Drill 17: Holding plate 18: First plastic sheet 19: Plastic film 20: Second plastic Sheet 21: Through hole 22: Coolant

Claims (6)

A method of drilling holes in plastic film,
The first sheet, the plastic film, and the second sheet are laminated in this order on the support base, and a pressing plate having a through hole having a diameter larger than the hole is placed on the upper surface of the second sheet. And
A method for drilling a plastic film, wherein the drill is lowered through the through hole of the pressing plate while the plastic film and the drill are cooled, and the hole is formed in the plastic film.   The drilling method of Claim 1 which fills the through-hole of the said pressing plate with a coolant, and cools the said drill and a plastic film with this coolant.   The drilling method according to claim 1 or 2, wherein a hole having a diameter of 1 mm or less is drilled in a plastic film having a thickness of 30 µm or less. The drilling method according to claim 1, wherein the coolant is dry ice.   The method for punching a plastic film according to any one of claims 1 to 4, wherein the thickness of the first sheet is 3 to 10 mm, and the thickness of the second sheet is 0.05 to 0.5 mm. .   The hole making method according to any one of claims 1 to 5, wherein after making a hole in the plastic film, the hole is photographed from the front side and the back side of the plastic film, and the accuracy of the hole is confirmed.

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