JP2005288578A - Device and method for punching laminated sheet material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for punching a laminated sheet material for making deformation of an adhesive film difficult to be left in the cut laminated sheet material. <P>SOLUTION: The deformation of the adhesive film in the laminated sheet material 32 can be corrected by pressing the laminated sheet material 32 in a thickness direction by pressing rollers 68 and 69, while holding the laminated sheet material 32 between receiving rollers 66, after punching blades 60, 62 and 64 of a punching die 56 cut the laminated sheet material 32 in the thickness direction till the laminated sheet material 32 contacts at least the adhesive film. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a punching device for a laminated sheet material that partially cuts a laminated sheet material including an adhesive film in the thickness direction, and a method for punching a laminated sheet material including an adhesive film.

  A laminated sheet material including a synthetic resin film, an adhesive film, and the like is manufactured by punching with a punching blade into a punched body having a predetermined shape (for example, see Patent Document 1). For example, a cover sheet to be bonded onto a recording surface of an optical disk substrate is manufactured by punching a laminated sheet material into a disk shape or the like with a punching blade.

  In many cases, a laminated sheet material for an optical disk cover sheet is a cover sheet in which an adhesive film is formed on one side of a resin film, a release sheet attached to the surface of the adhesive film of the cover sheet, and the cover sheet. It consists of a four-layer structure provided with a protective sheet affixed to the surface opposite to the adhesive film. In the punching process, for example, a punching blade whose blade edge portion extends in an annular shape is pressed against the surface on the protective sheet side, and the protective sheet and the cover sheet in the laminated sheet material are respectively disc-shaped or aligned with the recording surface of the disk substrate. Stamped into an annular shape for processing.

By the way, during this punching process, the pressure also acts on the laminated sheet material in a direction substantially perpendicular to the pressing direction of the punching blade, so that the laminated sheet material is easily deformed, and in particular, the adhesive strength in the film is weak. The adhesive film is easily deformed greatly. Here, if the deformed portion remains in the adhesive film, the deformed portion forms bubbles when the cover sheet is bonded to the recording surface of the disk substrate.
JP 2003-25287 A

  In view of the above-described facts, an object of the present invention is to provide a punching device and a punching method for a laminated sheet material in which the adhesive film is hardly deformed in the cut laminated sheet material.

  The punching device for a laminated sheet material of the present invention described in claim 1 is a punching device for a laminated sheet material for cutting a laminated sheet material including an adhesive film in an inner layer, and can support the laminated sheet material. A support member, a punching die provided with a punching blade for cutting the laminated sheet material to at least a layer in contact with the adhesive film in the thickness direction, and the laminated sheet material cut with the punching blade in the thickness direction. And a pressing means for pressing.

  According to the punching device for a laminated sheet material of the present invention described in claim 1, the punching blade of the punching die cuts the laminated sheet material to at least the layer in contact with the adhesive film in the thickness direction, and the pressing means performs this cutting. The laminated sheet material thus pressed is pressed in the thickness direction. At the time of cutting, the adhesive film easily deforms because the load acts in a direction substantially perpendicular to the thickness direction of the laminated sheet material, but the laminated sheet material is pressed by pressing the laminated sheet material in the thickness direction after cutting. The deformation of the adhesive film in the material can be corrected.

  A punching device for a laminated sheet material according to a second aspect of the present invention is characterized in that, in the configuration according to the first aspect, the pressing means presses around a cut line formed in the laminated sheet material. To do.

  According to the punching device for a laminated sheet material of the present invention described in claim 2, since the pressing means presses the periphery of the cut line formed in the laminated sheet material, the vicinity of the cut line where the adhesive film is easily deformed. The deformation of the adhesive film can be corrected.

  A method for punching a laminated sheet material according to a third aspect of the present invention is a method for punching a laminated sheet material for cutting a laminated sheet material including an adhesive film in an inner layer, wherein a punching blade is pressed against the laminated sheet material. And a cutting step of cutting the laminated sheet material to at least a layer in contact with the adhesive film in the thickness direction, and a pressing step in which the pressing means presses the laminated sheet material in the thickness direction after the cutting step. It is characterized by.

  According to the method for punching a laminated sheet material of the present invention described in claim 3, first, in the cutting step, a layer that presses the punching blade against the laminated sheet material and contacts the laminated sheet material at least with the adhesive film in the thickness direction. Cut until. Next, in the pressing step after the cutting step, the pressing means presses the laminated sheet material in the thickness direction. At the time of cutting in the cutting process, the adhesive film easily deforms because the load acts in a direction substantially perpendicular to the thickness direction of the laminated sheet material, but the laminated sheet material is moved in the thickness direction in the pressing process after the cutting process. By pressing, the deformation of the adhesive film in the laminated sheet material can be corrected.

  According to a fourth aspect of the present invention, there is provided the method for punching a laminated sheet material according to the third aspect, wherein the pressing means presses around a cut line formed in the laminated sheet material. .

  According to the method for punching a laminated sheet material of the present invention described in claim 4, since the pressing means presses the periphery of the cut line formed on the laminated sheet material, the adhesive film is adhered in the vicinity of the cut line where the adhesive film is easily deformed. The deformation of the membrane can be corrected.

  According to a fifth aspect of the present invention, there is provided a method for punching a laminated sheet material according to the present invention, wherein the adhesive film is formed on one surface and the disk substrate is recorded via the adhesive film. A cover sheet that is bonded to the surface, a release sheet that is bonded to the surface of the adhesive film in the cover sheet, and a protective sheet that is bonded to the surface of the cover sheet opposite to the adhesive film. With respect to the laminated sheet material, the punching blade cuts the protective sheet and the cover sheet into an applicable shape of the disk substrate.

  According to the method for punching a laminated sheet material of the present invention described in claim 5, the punching blade has an applied shape of the disk substrate (a shape that matches the shape applied to the recording surface of the disk substrate (for example, a circular shape)). After the protective sheet and the cover sheet are cut, the pressing means presses the laminated sheet material in the thickness direction, so that the deformation of the adhesive film in the portion that is half-cut into the applicable shape of the disk substrate and commercialized is corrected. Can do.

  As described above, according to the laminated sheet material punching apparatus and the laminated sheet material punching method of the present invention, there is an excellent effect that the deformation of the adhesive film hardly remains in the cut laminated sheet material.

1st Embodiment of the punching apparatus of the lamination sheet material in this invention and the punching method of a lamination sheet material is described based on drawing.
(Configuration of optical disc)
With reference to FIG. 1, the structure of the optical disk which bonded the cover sheet manufactured by the punching method of the lamination sheet material which concerns on embodiment of this invention is demonstrated easily. The optical disk 10 is provided with a disk substrate 12 formed in a disk shape, and one surface of the disk substrate 12 is an information recording surface 14. A light reflecting layer 18 and a light absorbing layer 20 are sequentially laminated on the recording surface 14 side of the disk substrate 12, and the information recording layer (hereinafter simply referred to as “recording layer”) is formed by the light reflecting layer 18 and the light absorbing layer 20. 16) is configured. The optical disc 10 is provided with a transparent cover layer 22 on the disc substrate 12 so as to cover the recording layer 16. The cover layer 22 is constituted by a cover sheet 24 composed of a transparent resin film 26 and an adhesive film 28, and the cover sheet 24 has a thickness of about 100 μm.

  The disk substrate 12 is molded using a resin such as PC (polycarbonate). The cover sheet 24 constituting the cover layer 22 in the optical disc 10 is based on a resin film 26 made of a transparent resin such as PC (polycarbonate), and an adhesive film 28 having a certain thickness is formed on one surface of the resin film 26. A film is formed. The adhesive film 28 is formed of a known acrylic, rubber, or silicon-based adhesive, but the adhesive film 28 formed of an acrylic adhesive is desirable from the viewpoint of transparency and durability.

  A circular center hole 29 is formed in the center of the disk substrate 12 along the axis SD that is the rotation center of the optical disk 10. In addition, a circular opening 30 having a diameter larger than that of the center hole 29 around the axis SD is also formed at the center of the cover layer 22.

In the optical disk 10 production line, a step of forming the recording layer 16 on one surface of the disc substrate 12 formed by molding or the like, and a step of forming the cover sheet 24 from the laminated sheet material 32 (see FIG. 2). And are performed independently. After manufacturing the disk substrate 12 and the cover sheet 24 provided with the recording layer 16 by these processes, the optical disk 10 shown in FIG. 1 is manufactured by bonding the cover sheet 24 onto the disk substrate 12 in the bonding process. Is done.
(Layer structure of laminated sheet material)
The cover sheet 24 is formed by using a laminated sheet material 32 as shown in FIG. 2 as a processing material. The laminated sheet material 32 includes a resin film 26, an adhesive film 28 formed on one surface of the resin film 26, a release sheet 34 attached to the surface of the adhesive film 28, and an adhesive film 28 of the resin film 26. It is set as the four-layer structure which consists of the protection sheet 36 affixed on the surface on the opposite side. The release sheet 34 is formed in a thin film shape using a resin such as PET (polyethylene terephthalate) as a raw material, and a release agent is applied to the bonding surface 34A in order to improve the peelability. Here, as the release agent applied to the bonding surface 34 </ b> A of the release sheet 34, for example, one having silicon as a main component is used. The protective sheet 36 is formed in a thin film shape using a resin such as PET (polyethylene terephthalate) or PE (polyethylene) as a raw material. An adhesive mainly composed of vinyl acetate is applied.
(Configuration of laminated sheet punching device)
The laminated sheet material 32 is formed in a long band shape, and is supplied to the production line of the optical disc 10 (see FIG. 1) as a sheet roll wound up in a roll shape. In the production line of the optical disc 10, as shown in FIG. 3, the sheet roll 33 is loaded into the delivery unit 42 in the punching device 40 and is rotatably supported by the unwinding shaft 44 of the delivery unit 42. In the delivery part 42, a pair of delivery rollers 46 are disposed at the delivery part of the laminated sheet material 32. The discharge roller 46 is rotatable while sandwiching the laminated sheet material 32. The laminated sheet material 32 that has passed through the discharge roller 46 is sent out from the sending section 42. A plurality of conveying rollers 48 are disposed downstream of the discharge roller 46 on the delivery side, and these conveying rollers 48 convey the laminated sheet material 32 while adjusting the tension.

  A downstream side (right side in FIG. 3) of the conveyance roller 48 is a punching unit 50. In the punching unit 50, a guide roller 52 is disposed on the carry-in side of the laminated sheet material 32, and the laminated sheet material 32 is conveyed onto the receiving table 54 via the guide roller 52. The cradle 54 has a flat plate shape and is disposed with the receiving surface 54A facing upward. A punching die 56 is provided above the cradle 54 so as to face it.

  As shown in FIG. 4, a pressing rubber 58 is provided on the side of the punching die 56 in contact with the laminated sheet material 32, and the pressing rubber 58 has a sponge shape and can be compressed and deformed. FIG. 5 shows a cross-sectional view of the configuration of the die 56 (the center line of the die 56 is indicated by C). As shown in FIG. 5, the punching die 56 includes an inner peripheral punching blade 60, an outer peripheral punching blade 62, and an edge punching blade 64 from the punching die main body 56 </ b> A above the holding rubber 58 toward the cradle 54. The base portions 60B, 62B, and 64B are held by the substrate portion 56B, and the blade edge portions 60A, 62A, and 64A are embedded in the presser rubber 58 except when punching. A slit (not shown) is formed in the presser rubber 58 from the blade edge portions 60 </ b> A, 62 </ b> A, 64 </ b> A toward the surface 58 </ b> A side of the presser rubber 58. As shown in FIG. 4 in which only the edge portions 60A, 62A, 64A of the inner peripheral punching blade 60, the outer peripheral punching blade 62, and the edge punching blade 64 are indicated by dotted lines, the inner peripheral punching blade 60 and the outer peripheral punching blade 62 is provided concentrically, and the edge punching blade 64 is further outside the outer peripheral punching blade 62 and forms an arc having the same axis as the inner peripheral punching blade 60 and the outer peripheral punching blade 62. A pair is provided.

  The inner peripheral punching blade 60 of the punching die 56 is formed so that the blade edge portion 60A (see FIG. 5) extends annularly along a circular locus having substantially the same diameter as the opening 30 (see FIG. 1) in the cover sheet 24. Is formed. Moreover, the protrusion length from the surface 58A (see FIG. 5) of the presser rubber 58 of the inner peripheral punching blade 60 at the time of punching is equal to the thickness T (see FIG. 6) of the entire laminated sheet material 32 or punching. Considering the compression deformation of the laminated sheet material 32 at the time, the thickness is slightly shorter than the thickness T.

  As shown in FIG. 4, the outer peripheral punching blade 62 of the punching die 56 has an annular cutting edge 62 </ b> A (see FIG. 5) along a circular locus having substantially the same diameter or slightly smaller diameter as the disk substrate 12 (see FIG. 1). It is formed so as to extend. Moreover, the protrusion length from the surface 58A (refer FIG. 5) of the pressing rubber 58 of the outer periphery punching blade 62 at the time of punching is pasting of the peeling sheet 34 from the surface of the protective sheet 36 of the laminated sheet material 32 shown in FIG. It is set to be equal to the thickness TE up to the surface 34A or slightly longer than the thickness TE. Thereby, as shown in FIG. 6, the cutting edge portion 62 </ b> A of the outer peripheral punching blade 62 reaches the middle of the thickness of the release sheet 34, and the protective sheet 36 and the cover sheet 24 can be reliably cut.

  As shown in FIG. 4, a pair of edge punching blades 64 of the punching die 56 are formed on the outer side of the outer peripheral punching blade 62 and facing both the left and right sides in the width direction (arrow W direction) of the laminated sheet material 32. ing. The protruding length of the edge punching blade 64 from the surface 58A (see FIG. 5) of the presser rubber 58 at the time of punching is set similarly to the outer peripheral punching blade 62.

  A receiving roller 66 and pressing rollers 68 and 69 arranged in parallel to the receiving roller 66 and facing the receiving roller 66 are provided on the downstream side of the receiving table 54 and the die 56. The receiving roller 66 and the pressing rollers 68 and 69 receive torque from a roller driving unit (not shown) and rotate in a predetermined direction (in the directions of arrows 66B, 68B, and 69B) at a uniform linear velocity. The roller surfaces 66A, 68A, and 69A of the receiving roller 66 and the pressing rollers 68 and 69 are curved surfaces having a constant radius of curvature from the respective axis, and the pressing rollers 68 and 69 have a smaller diameter than the receiving roller 66. ing. Here, the pressing rollers 68 and 69 are urged with a predetermined urging force in the direction of the receiving roller 66 (arrow L direction and arrow M direction) by an urging mechanism (not shown) such as a spring. 32 is pressed. The pressing force E at this time is preferably 10 MPa ≦ E ≦ 50 MPa. By setting 10 MPa ≦ E, the deformation of the adhesive film 28 (see FIG. 6) in the laminated sheet material 32 generated at the time of punching can be corrected, and by setting E ≦ 50 MPa, the entire original thickness of the laminated sheet material 32 can be corrected. The thickness T (see FIG. 2) can be substantially maintained.

  As shown in FIG. 3, a conveying roller 72 is disposed downstream of the receiving roller 66 and the pressing rollers 68 and 69 on the sending side, and the conveying roller 72 conveys the laminated sheet material 32. A downstream side (right side in FIG. 3) of the conveyance roller 72 is a winding unit 74.

  A receiving roller 76 and a pressing roller 78 are disposed on the carry-in side of the winding unit 74. The receiving roller 76 and the pressing roller 78 are arranged opposite to each other in parallel with each other, and each receives torque from a roller driving unit (not shown) and rotates in a predetermined direction (in the directions of arrows 76B and 78B) at a uniform linear velocity. The roller surfaces 76 </ b> A and 78 </ b> A of the receiving roller 76 and the pressing roller 78 are curved surfaces having constant curvature radii from the respective shaft centers, and the pressing roller 78 has a smaller diameter than the receiving roller 76. Here, the pressing roller 78 is urged by a urging mechanism (not shown) with a predetermined urging force in the direction of the receiving roller 76 (arrow N direction), and presses the laminated sheet material 32. .

The winding unit 74 is provided with a winding shaft 80 that rotates in a predetermined winding direction (arrow J direction) in conjunction with the receiving roller 76 and the pressing roller 78. A motor (not shown) is connected to the winding shaft 80, and this motor transmits torque in the winding direction when the receiving roller 76 and the pressing roller 78 are rotated. As a result, the take-up shaft 80 winds the laminated sheet material 32 in a roll while applying a certain tension to the laminated sheet material 32 fed from the receiving roller 76 and the pressing roller 78. .
(Processing of laminated sheet material)
Next, a processing procedure in which the cover sheet 24 (see FIG. 1) bonded to the optical disc 10 is processed from the laminated sheet material 32 will be described.

As shown in FIG. 3, first, the sheet roll 33 of the laminated sheet material 32 is loaded into the feeding unit 42 in the punching device 40. The laminated sheet material 32 is pulled out from the sheet roll 33, conveyed at a constant speed by the conveying force from the conveying roller 48 via the discharge roller 46, and reaches the punching unit 50.
-Cutting process-
In the punching unit 50, the laminated sheet material 32 is guided to the guide roller 52 and conveyed onto the cradle 54 and temporarily stops at a predetermined position. On the pedestal 54, the die moving means (not shown) moves the punching die 56 downward (in the direction of arrow D) on the pedestal 54, and the inner peripheral punching blade 60 shown in FIG. The outer peripheral punching blade 62 and the edge punching blade 64 are pressed against the protective sheet 36 in the laminated sheet material 32 to cut the laminated sheet material 32.

  At this time, as shown in FIG. 6, the outer peripheral punching blade 62 penetrates the protective sheet 36 in the laminated sheet material 32 and the resin film 26 having the adhesive film 28 formed on one side, but does not penetrate the release sheet 34. As shown in FIG. 4, an outer peripheral cut line 82 is formed by cutting with the outer peripheral punching blade 62. As a result, the protective sheet 36 and the cover sheet 24 of the laminated sheet material 32 shown in FIG. 6 are punched into a disk shape at the inner peripheral side of the outer peripheral punching blade 62, and the disc attachment shown in FIG. The mating part 84 is separated from other parts.

  Further, as shown in FIG. 6, the inner peripheral punching blade 60 penetrates the entire laminated sheet material 32 during punching, and a circular through cut line 31 is formed at the center of the outer peripheral cut line 82 as shown in FIG. Form. Furthermore, as shown in FIG. 6, the edge punching blade 64 is half-cut to the same depth as that of the outer peripheral punching blade 62 at the time of punching to form the edge cutting line 83 shown in FIG.

  Here, the resin film 26 and the adhesive film 28 shown in FIG. 6 punched into a disk shape by the outer peripheral punching blade 62 shown in FIG. 4 are bonded to the disk substrate 12 (see FIG. 1). The portion of the through cut line 31 (see FIG. 7) of the resin film 26 and the adhesive film 28 punched by the inner peripheral punching blade 60 is an opening 30 (see FIG. 1) in the cover sheet 24.

  The cover sheet 24 is punched by the outer peripheral punching blade 62 and the inner peripheral punching blade 60 and is in a state where a protective sheet 36 having the same surface shape as the cover sheet 24 is adhered.

  After punching, the punching die 56 shown in FIG. 4 is moved upward by a die moving means (not shown), and the laminated sheet material 32 is conveyed at a constant speed (arrow F) by the conveying force from the receiving roller 66 and the pressing roller 68. Direction). Here, the release sheet 34 (see FIG. 6) of the laminated sheet material 32 is sent out in the conveying direction (arrow F direction) while remaining in the form of a long band without being punched by the outer peripheral punching blade 62 and the edge punching blade 64. The laminated sheet material 32 is temporarily stopped after being conveyed by one pitch (the length of P shown in FIG. 4).

On the pedestal 54 with respect to the laminated sheet material 32 once stopped, a die moving means (not shown) moves the punching die 56 downward (in the direction of arrow D) to move the inner peripheral punching blade 60 of the punching die 56, The outer peripheral punching blade 62 and the edge punching blade 64 are pressed against the protective sheet 36 (see FIG. 6) in the laminated sheet material 32 to cut the laminated sheet material 32. Thereafter, similar conveyance and punching processes are repeated continuously.
-Pressing process-
As shown in FIG. 4, the laminated sheet material 32 that has passed between the punching die 56 and the cradle 54 is sandwiched between a receiving roller 66 and pressing rollers 68 and 69. The receiving roller 66 and the pressing rollers 68 and 69 rotate at the same linear speed to send the laminated sheet material 32 downstream. At this time, since the pressing rollers 68 and 69 are biased by a biasing mechanism (not shown), the laminated sheet material 32 is composed of the roller surface 66A of the receiving roller 66 and the roller surfaces 68A and 69A of the pressing rollers 68 and 69. , While being pressed (pressurized) between the receiving roller 66 and the pressing rollers 68 and 69, it is conveyed downstream at a constant speed. When the laminated sheet material 32 is conveyed by the receiving roller 66 and the pressing rollers 68 and 69, the receiving roller 66 presses the roller surface 66A against the surface of the release sheet 34 (see FIG. 9), and the pressing rollers 68 and 69 are The roller surfaces 68A and 69A are brought into pressure contact with the surface of the protective sheet 36 (see FIG. 9). At this time, the distance H (see FIG. 9) between the pressing rollers 68 and 69 and the receiving roller 66 is slightly shorter than the initial overall thickness T (see FIG. 2) of the laminated sheet material 32 (for example, in FIG. When the thickness of the adhesive film 28 shown is TN, control is performed so that H = T− (TN / 2)).

As shown in FIG. 3, the laminated sheet material 32 conveyed to the downstream side at a constant speed by the conveying force from the receiving roller 66 and the pressing rollers 68 and 69 is conveyed to the winding unit 74 via the conveying roller 72. . In the winding unit 74, the laminated sheet material 32 is pressed (pressed) between the pressing roller 78 and the receiving roller 76, and then wound around the winding shaft 80 in a roll shape.
(Operation of the embodiment)
Here, in this embodiment, since the part separated as the disk laminating portion 84 shown in FIG. 4 becomes a portion used as a product after punching, the above-mentioned attention is paid to the punching of the disc laminating portion 84. The operation of the embodiment will be described.

  As shown in FIG. 6, when the inner peripheral punching blade 60 and the outer peripheral punching blade 62 are pressed against the laminated sheet material 32, the cutting edge portions 60A and 62A cut the laminated sheet material 32 in the thickness direction. At this time, both the inner and outer surfaces (the right side and the left side in FIG. 6) of the inner peripheral punching blade 60 and the outer peripheral punching blade 62 press the cut surfaces 86, 87, 88, 89 of the laminated sheet material 32. As a result, the pressure acting as a component force in a direction (arrow A, arrow B direction) substantially perpendicular to the pressing direction also increases. For this reason, the laminated sheet material 32 is easily deformed, and in particular, the adhesive film 28 having a weak adhesive force in the film is easily deformed greatly. Here, FIG. 8 shows an enlarged view of a state where the deformed portion 90 is generated due to the deformation of the adhesive film 28. The deformed portion 90 shown in FIG. 8 occurs within about 1 mm from the cut surfaces 88 and 89.

  The laminated sheet material 32 whose adhesive film 28 has been deformed by cutting is sandwiched between a receiving roller 66 and a pressing roller 68, as shown in FIG. FIG. 10A shows a state where the disk laminating portion 84 of the laminated sheet material 32 is sandwiched between the receiving roller 66 and the pressing roller 68. As shown in FIG. 10A, the roller surface 68A of the pressing roller 68 presses the laminated sheet material 32 toward the receiving roller 66 (in the direction of the arrow L), thereby pressing the deformed portion 90 of the adhesive film 28. The At this time, a load is applied to the protective sheet 36 and the cover sheet 24 in a direction (arrow K direction) that is substantially perpendicular to the pressing direction (arrow L direction) of the pressing roller 68 and that faces the cut surface 88 of the disc bonding portion 84. Works. Accordingly, the deformed portion 90 of the adhesive film 28 is gradually corrected, and the laminated sheet material 32 is conveyed by the rotation of the receiving roller 66 and the pressing roller 68.

  FIG. 10B shows a state in which the laminated sheet material 32 in the state of FIG. As shown in FIG. 10B, in the range in which the laminated sheet material 32 is pressed and moved, the deformation of the adhesive film 28 is corrected, and the deformed portion 90 of the adhesive film 28 is only a portion close to the cut surface 88. . When the receiving roller 66 and the pressing roller 68 are further rotated after the state shown in FIG. 10B, as shown in FIG. 9, the adhesive film 28 in the disk laminating portion 84 (on the right side of the cut surface 88). The deformation of is corrected.

  In this embodiment, as shown in FIG. 3, in addition to between the pressing roller 68 and the receiving roller 66, between the pressing roller 69 and the receiving roller 66, and between the pressing roller 78 and the receiving roller 76. However, it is also possible to adopt a form in which pressure conveyance is performed at any one or two of these three locations.

  Next, a laminated sheet material punching apparatus and a laminated sheet material punching method according to a second embodiment will be described with reference to FIGS. In the first embodiment, as illustrated in FIG. 3, the case where the laminated sheet material 32 is pressed between the pressing rollers 68, 69, 78 and the receiving rollers 66, 76 has been described. The form is a form in which the laminated sheet material 32 is pressed by a flat plate-like press 94 as shown in FIG. The configuration of the laminated sheet material punching apparatus and the laminated sheet material punching method according to the second embodiment does not use the pressing rollers 68, 69, and 78 shown in FIG. The laminated sheet material 32 is pressed by the shape press 94, and the other configurations are substantially the same as those in the first embodiment, and therefore, the same reference numerals are given and description thereof is omitted.

  As shown in FIG. 11, conveyance rollers 92 and 93 arranged in parallel to the receiving roller 66 and facing the receiving roller 66 are provided on the conveyance downstream side of the receiving table 54 and the extraction table 56. The laminated sheet material 32 is sandwiched between the receiving roller 66 and the conveying rollers 92 and 93 and sent out from the punching unit 50.

  A flat plate-like press 94 and a face plate 96 are disposed on the carry-in side of the winding unit 74. As shown in FIG. 12, the face plate 96 has a flat surface 96A facing upward. An inner peripheral convex portion 94 </ b> A and an outer peripheral convex portion 94 </ b> B are provided on the surface of the flat plate-shaped press 94 facing the face plate 96. As shown in FIG. 13, the inner circumferential convex portion 94 </ b> A has an annular surface facing the laminated sheet material 32, and is formed with a width (about 5 mm) capable of pressing around the through cut line 31. Further, the outer peripheral convex portion 94B has an annular surface facing the laminated sheet material 32 and is formed with a width (about 5 mm) capable of pressing the periphery of the outer peripheral cut line 82.

  FIG. 14 shows the positional relationship of the outer peripheral convex portion 94 </ b> B with respect to the adhesive film 28. In the deformed portion 90 generated by cutting with the outer peripheral punching blade 62 (see FIG. 6), the dimension X from the position S in contact with the outer peripheral punching blade 62 is within about 1 mm. In order to correct the deformed portion 90 generated in the range of about 1 mm, the width V of the pressing surface 94C of the outer peripheral convex portion 94B is set to about 5 mm. Further, the dimension U from the outer end portion (left end portion in FIG. 14) of the pressing surface 94C in the outer peripheral convex portion 94B to the position S where the adhesive film 28 is in contact with the outer peripheral punching blade 62 is positioned to be about 1 mm. Control.

  An upper part 95 of the flat plate-like press 94 shown in FIG. 12 is fixed to a moving means (not shown), and the flat plate-like press 94 can be moved downward (in the direction of arrow Y) by this moving means. . Here, when the laminated sheet material 32 is pressed, the inner peripheral convex portion 94A and the outer peripheral convex portion 94B shown in FIG. 13 are aligned at positions where the penetrating cut line 31 and the outer peripheral cut line 82 can be pressed, respectively. 12 is moved and pressed toward the laminated sheet material 32 on the face plate 96 (in the direction of arrow Y).

  Thus, by pressing the periphery of the through cut line 31 and the outer peripheral cut line 82 shown in FIG. 13, the adhesive film 28 (see FIG. 6) is easily deformed in the vicinity of the through cut line 31 and the outer peripheral cut line 82. The deformation of the adhesive film 28 can be corrected. That is, for example, when the laminated sheet material 32 shown in FIG. 15 is pressed from the protective sheet 36 side, the deformed portion 90 of the adhesive film 28 on the disk bonding surface 84 (on the right side of the cut surface 88) is pressed, A load acts on the protective sheet 36 and the cover sheet 24 in a direction substantially perpendicular to the pressing direction toward the cut surface 88 (arrow K direction), and the deformation of the adhesive film 28 is corrected.

  The pressing force Z at this time is preferably 10 MPa ≦ Z ≦ 50 MPa. By setting 10 MPa ≦ Z, the deformation of the adhesive film 28 (see FIG. 6) in the laminated sheet material 32 generated at the time of punching can be corrected, and by setting Z ≦ 50 MPa, the entire initial thickness of the laminated sheet material 32 can be corrected. The thickness T (see FIG. 2) can be substantially maintained.

  After pressing, the flat plate-like press 94 shown in FIG. 12 is moved upward by a moving means (not shown), and the laminated sheet material 32 is conveyed by the conveying roller 73 and is rolled on the winding shaft 80 shown in FIG. Rolled up.

  In the second embodiment, the case where the flat plate-like press 94 and the face plate 96 are arranged on the carry-in side of the winding unit 74 has been described as an example. However, the present invention is not limited to this arrangement position, and after cutting. It only has to be arranged between the punching die 56 and the cradle 54 and the winding shaft 80 so that it can be pressed before winding, for example, the flat plate-like press 94 and the surface on the discharge side of the punching portion 50. A board 96 may be arranged.

It is a perspective view which shows the structure of the optical disk which bonded together the cover sheet manufactured by the punching method of the lamination sheet material which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the layer structure of a lamination sheet material. It is a block diagram which shows the punching apparatus of the lamination sheet material which concerns on the 1st Embodiment of this invention. It is a perspective view which shows the principal part in the punching part of the punching apparatus of the lamination sheet material which concerns on the 1st Embodiment of this invention. It is sectional drawing (equivalent to the 5-5 line cross section of FIG. 4) which shows the structure of a punching die, etc., and shows the state before punching. It is sectional drawing which shows the state by which a lamination sheet material is pierce | punched. It is a top view which shows the punching state of a lamination sheet material. It is sectional drawing which shows the lamination sheet material half-cut by the outer periphery punching blade. It is sectional drawing which shows the state in which a lamination sheet material is press-conveyed with a press roller. (The state where the deformation of the adhesive film is corrected by the pressing roller is shown.) It is sectional drawing which shows the state which a laminated sheet material press-conveys with a press roller in time. (A change in the state of pressing and conveying is shown in the order of FIG. 10A and FIG. 10B.) It is a block diagram which shows the punching apparatus of the lamination sheet material which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows a flat plate-like press and a face plate. It is a top view which shows the positional relationship of the inner peripheral convex part and outer peripheral convex part of a flat plate-shaped press with respect to the penetration cut line and outer peripheral cut line of a laminated sheet material. It is sectional drawing which shows the positional relationship of the outer periphery convex part with respect to an adhesion film. (The protective sheet, resin film, and release sheet in the laminated sheet material are omitted.) It is sectional drawing which shows the state by which the lamination sheet material was pressed by the outer periphery convex part.

Explanation of symbols

12 Disc substrate 14 Recording surface 24 Cover sheet 26 Resin film (layer in contact with adhesive film)
28 Adhesive film 31 Through cut line (cut line)
32 Laminated sheet material 34 Release sheet 36 Protective sheet 40 Punching device 54 Receiving base (supporting member)
56 Punching die 60 Inner peripheral punching blade (Punching blade)
62 Peripheral punching blade (Punching blade)
64 Edge cutting blade (punching blade)
68 Pressing roller (pressing means)
69 Pressing roller (pressing means)
78 Pressing roller (pressing means)
82 Perimeter cut line (cut line)
94 Flat plate press (pressing means)

Claims (5)

A laminated sheet material punching device for cutting a laminated sheet material containing an adhesive film in an inner layer,
A support member capable of supporting the laminated sheet material;
A punching die provided with a punching blade for cutting the laminated sheet material in a thickness direction to at least a layer in contact with the adhesive film;
A pressing means for pressing the laminated sheet material cut by the punching blade in the thickness direction;
A device for punching laminated sheet material, comprising:   The punching device for a laminated sheet material according to claim 1, wherein the pressing means presses around a cut line formed in the laminated sheet material. A method of punching a laminated sheet material for cutting a laminated sheet material containing an adhesive film in an inner layer,
A cutting step of pressing a punching blade against the laminated sheet material and cutting the laminated sheet material to at least a layer in contact with the adhesive film in the thickness direction;
A pressing step in which the pressing means presses the laminated sheet material in the thickness direction after the cutting step;
A method for punching a laminated sheet material, comprising:   4. The method for punching a laminated sheet material according to claim 3, wherein the pressing means presses around a cut line formed in the laminated sheet material. In the cover sheet, an adhesive film is formed on one surface and bonded to the recording surface of the disc substrate via the adhesive film, a release sheet attached to the surface of the adhesive film in the cover sheet, and the cover sheet For a laminated sheet material provided with a protective sheet affixed to the surface opposite to the adhesive film,
The method for punching a laminated sheet material according to claim 3 or 4, wherein the punching blade cuts the protective sheet and the cover sheet into an applicable shape of the disk substrate.

Images