JP4745780B2 - Adhesive sheet forming apparatus and forming method - Google Patents

Description

  The present invention relates to an apparatus and method for forming an adhesive sheet, and in particular, an adhesive sheet is formed by providing a notch in a strip-like original fabric on which a sheet is temporarily attached via an adhesive layer to a release sheet. The present invention relates to an apparatus and a method for forming an adhesive sheet capable of preventing stringing of an adhesive layer along a cutting edge and generation of chips of a sheet material when performing reverse layer peeling.

  Conventionally, an optical disk capable of reading and writing high-capacity information is configured as a recording layer on one side. For example, the recording layer uses a plate called a stamper on an ultraviolet curable adhesive layer to form irregularities (pits) to be read signals and grooves (grooves) for guiding laser light. After curing the layer, various surface treatments are performed.

  9 to 10 show an adhesive sheet forming apparatus in the previous stage of laminating the adhesive layer on the optical disc. In the same figure, the adhesive sheet forming apparatus is made of a raw material L, which is a continuous strip of a sheet FS temporarily attached to a release sheet PS via an ultraviolet curable adhesive layer A, and a closed loop outer cutting blade. The die cutting roller 53 having the inner cutting blade 51 and the inner cutting blade 52 and the anvil roller 54 opposed to the die cutting roller 53 are provided in the raw fabric L so as to form the adhesive sheet S by providing the outer cut 55 and the inner cut 56. Yes.

  After the area surrounded by the inner notch 56, that is, the central area is recovered as an unnecessary sheet portion S1 through an appropriate recovery device, the adhesive sheet S is positioned at the tip position of the peel plate 57 as shown in FIG. The release sheet PS is peeled off. As shown in FIG. 12, the adhesive sheet S is affixed to the optical disk D on the table T, and then the sheet FS is peeled off, and a stamper (not shown) is applied to the surface of the adhesive layer A thus exposed. A recording layer is formed by forming pits and grooves.

However, in such a configuration, as shown in FIG. 10, since the inner cutting blade 52 is set to a blade height that contacts the anvil roller 54, the sharpness of the inner cutting blade 52 over time is increased. There is an inconvenience that it decreases.
Since the sharpness of the inner cutting blade 52 is lowered, the cutting accuracy is lowered. Therefore, as shown in FIGS. 11 and 12, when the release sheet PS is peeled off or when the sheet FS is peeled off, the inner cut is made. The adhesive layer A is stretched from the edge of 56, which causes a so-called stringing phenomenon or a chip of the sheet FS. In the state where such stringing or cutting chips are adhered on the adhesive layer A, even if a stamper that forms a very fine groove is pressed, a pit or groove cannot be formed in part.

  By the way, Patent Document 1 discloses a bonding apparatus for attaching a protective sheet to an optical disk. The apparatus is provided with a die-cutting device using the above-described die-cutting roller and anvil roller, and a configuration including a collecting device that blows air to the inner region of the inner cut and collects it.

JP 2004-134020 A

  However, even in the case of the die-cutting device disclosed in Patent Document 1, the cutting blade that forms the inner cut has a blade height that contacts the anvil roller. No measures are taken.

[Object of invention]
The present invention has been devised by paying attention to the inconveniences described above, and its purpose is to prevent damage to the cutting blade, to avoid string pulling from the cutting edge and to the generation of chips, which can be applied to the cutting edge. An object of the present invention is to provide an apparatus and method for forming an adhesive sheet that can prevent clinging to nearby adhesives.

  In order to achieve the above object, the present invention is directed to at least a three-layer belt-like raw material in which a sheet is temporarily attached to a release sheet via an adhesive layer, and the release is performed along the locus of a closed loop from the sheet side. A first die-cutting device for forming an adhesive sheet having a predetermined planar shape by providing an outer notch and an inner notch reaching the sheet, and the inside of the inner notch, along the locus of the closed loop from the release sheet side A second die-cutting device that provides a cutting cut reaching the adhesive layer, a sheet portion and an adhesive layer portion surrounded by the inner cut, and a release sheet portion surrounded by the cutting cut are removed as unnecessary sheet portions. The removal apparatus is provided.

  In the present invention, the first die-cutting device is disposed along the feeding direction of the original fabric, and the second die-cutting device is upstream or downstream in the feeding direction with respect to the first die-cutting device. Is arranged.

  In addition, the first die cutting device and the second die cutting device may be arranged at symmetrical positions sandwiching the original fabric.

  Further, the removing device includes an extruding device capable of advancing and retreating the unnecessary sheet portion in the direction of extruding from the release sheet side, and a collecting device for sucking the extruded unnecessary sheet portion.

  Further, the removing device includes a pin provided on an outer peripheral surface portion of a rotating shaft arranged on the release sheet side and protruding in a radial direction of the rotating shaft, and a collecting device arranged on the sheet side, It is possible to adopt a configuration in which the unnecessary sheet portion is pushed out by a pin and the unnecessary sheet portion is sucked into the collection device.

In addition, the present invention is directed to at least a three-layer belt-like raw material in which a sheet is temporarily attached to a release sheet via an adhesive layer, and a predetermined depth is formed by forming a cut along a locus of a closed loop from the sheet side. In the method of forming an adhesive sheet having a planar shape,
After forming an outer cut and an inner cut reaching the release sheet from the sheet side to form a planar shape of the adhesive sheet,
From the release sheet side to the inside incision, forming a cutting cut for reaching the adhesive layer along a closed loop trajectory,
Next, the sheet portion and the adhesive layer portion surrounded by the inner cut and the release sheet portion surrounded by the extraction cut are extruded and removed as unnecessary sheet portions.

  According to the present invention, the first die-cutting device is provided with the outer cut and the inner cut reaching from the sheet side to the release sheet, respectively, while the second die-cut device is used for the extraction cut reaching from the release sheet side to the adhesive layer. And removing the sheet portion and the adhesive layer portion surrounded by the inner cut and the release sheet portion surrounded by the extraction cut with a removing device, such as cutting of a cutting blade that forms the inner cut, etc. Damage can be reliably prevented and unnecessary sheet parts can be removed without causing the stringing or chipping phenomenon by avoiding the decrease in cutting accuracy associated with the damage. Can be prevented.

  In the present invention, by arranging the first die cutting device and the second die cutting device along the feed direction of the original fabric, it is possible to facilitate maintenance and inspection of each device.

  Further, in the configuration in which the first die-cutting device and the second die-cutting device are arranged at symmetrical positions with the original fabric sandwiched therebetween, the length of the adhesive sheet forming device can be shortened.

  Furthermore, since the removing device is configured to include an extrusion device that pushes out the unnecessary sheet portion, the unnecessary sheet portion can be reliably removed.

  Further, when the removing device includes a pin protruding in the radial direction of the roller and a collecting device, the unnecessary sheet portion can be removed by suction even if the amount of extrusion is small.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a schematic front view of an apparatus for forming an adhesive sheet according to the present embodiment, and FIG. 2 shows a schematic perspective view thereof. In the drawings, the thickness of the original fabric and the height of the cutting blade are emphasized for easy understanding of the contents. 1 and 2, the apparatus for forming an adhesive sheet is intended for a three-layer belt-shaped raw fabric L in which a sheet FS is temporarily attached to a release sheet PS via an ultraviolet curable adhesive layer A. . This adhesive sheet forming apparatus is provided with an outer notch 11 and an inner notch 12 that reach the release sheet PS along a closed loop trajectory from the sheet FS side to form an adhesive sheet S having a predetermined planar shape. 1 die-cutting device 15 and a cutting notch that is arranged on the downstream side in the feed direction of the original fabric L and that reaches the adhesive layer A along the locus of the closed loop from the release sheet PS inside the inner notch 12 6 (see FIG. 6), the second die-cutting device 17, the sheet portion FS1 and the adhesive layer portion A1 surrounded by the inner cut 12, and the release sheet portion PS1 surrounded by the extraction cut 16 are unnecessary sheets. A removal device 18 that is removed as a portion S1 is provided.

  The first die-cutting device 15 includes an anvil roller that pinches the original fabric L between the first die-cutting roller 20 located on the sheet FS side and the first die-cutting roller 20 located on the release sheet PS side. 21. The first die-cut roller 20 has an outer cutting blade 22 that forms a closed loop-shaped outer cut 11 and an inner cutting blade 23 that forms an inner cut 12 on the outer peripheral surface substantially corresponding to the planar shape of the optical disk. The heights of the outer cutting blade 22 and the inner cutting blade 23 are high enough to form a cut that reaches the release sheet PS, and a so-called half cut is formed in the original fabric L without contacting the anvil roller 21. It is like that.

  The second die-cutting device 17 includes an anvil roller that pinches the original fabric L between the second die-cutting roller 25 located on the release sheet PS side and the second die-cutting roller 25 located on the sheet FS side. 26. The second die-cutting roller 25 is configured to include an extraction blade 27 that forms a closed-loop extraction cut 16 on the outer peripheral surface inside the inner cut 12. The blade height of the extraction blade 27 is set to a height at which a cut having a depth reaching the adhesive layer A can be formed. It is like that.

  The removing device 18 is disposed on the downstream side of the second die-cutting device 17 in the feeding direction of the original fabric L. The removing device 18 includes an extrusion device 28 that pushes the unnecessary sheet portion S1 upward from the release sheet PS side, and a recovery device 29 that is located above the extrusion device 28 and located on the sheet FS side. The extrusion device 28 is configured by a rod shaft that can be moved back and forth in the vertical direction via a cylinder or the like (not shown), and the collection device 29 is configured with a suction hole (not shown) on the lower surface side. The extruding device 28 presses the release sheet PS upward when it rises, and pushes out the unnecessary sheet portion S1 and pushes it out from the raw fabric L. The extruded unnecessary sheet portion S1 is sucked into the collecting device 29. It has come to be.

  In FIGS. 1 and 2, a peel plate (not shown) is disposed downstream of the removing device 18 in the original feed direction, and the release sheet PS is rapidly reversed at the tip of the peel plate. The sheet FS is provided so as to be peeled from the release sheet PS together with the adhesive layer A.

  Next, the operation of this embodiment will be described.

  As shown in FIG. 2, when the raw fabric L passes through the first die cutting device 15, an outer cut 11 and an inner cut 12 that substantially correspond to the outer edge and the central hole of the optical disc are formed on a substantially concentric circle. Thus, an adhesive sheet S to be bonded to one side of the optical disk is formed. The depths of the outer notch 11 and the inner notch 12 reach the release sheet PS without reaching the anvil roller 21 due to the above-described blade height.

  The original fabric L in which the cuts 11 and 12 are formed in this way is set so that the extraction blade 28 is positioned inside the inner cut 12 when passing through the second die cutting device 17. As a result, an extraction notch 16 continuous along a substantially circular closed loop is formed inside the inner notch 12 from the release sheet PS side (see FIGS. 2A, 2B and 6). The depth of the extraction notch 16 also reaches the boundary between the release sheet PS and the adhesive layer A without reaching the anvil roller 26.

  When the original fabric L on which the cut 16 for extraction has been formed passes through the removing device 18, the extrusion device 28 arranged on the release sheet PS side rises to give an upward pushing force to the release sheet PS. Will be. By this pushing force, the unnecessary sheet portion S1 shown in FIGS. 1 and 2 is pushed out from the original fabric L and can be removed by sucking it with the collecting device 29.

  In this way, the adhesive sheet S from which the unnecessary sheet portion S1 is extracted is peeled off the peelable sheet PS via a peel plate (not shown) and bonded to the optical disc. The adhesive sheet S bonded to the optical disc is formed with pits and grooves through the stamper after the sheet FS is peeled off.

  Therefore, according to such an embodiment, since the depth of the inner cut 12 by the inner cutting blade 23 reaches the release sheet PS, the cutting edge of the cutting blade is effectively prevented from being damaged. For this reason, when the unnecessary sheet portion S1 is removed by the extrusion device 28, the phenomenon of stringing or chipping is eliminated, and the bonding sheet S can be bonded to the optical disc with high accuracy. Moreover, when the sheet FS is peeled off from the adhesive layer A after the pasting, the above-described phenomenon can be similarly prevented.

As described above, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
In other words, the present invention has been illustrated and described mainly with respect to specific embodiments, but without departing from the scope of the technical idea and object of the present invention, the shape, position, or With respect to the arrangement and the like, those skilled in the art can make various changes as necessary.

  For example, the removal device 18 in the above embodiment is illustrated and described in the case where the extrusion device 28 is configured by a rod shaft that can advance and retreat in the vertical direction, that is, the direction orthogonal to the surface of the original fabric L. For example, as shown in FIG. 7, the rotation shaft 40 and a pin 41 provided on the outer peripheral surface portion of the rotation shaft 40 and projecting in the radial direction of the rotation shaft 40 are not limited thereto. It is also possible to remove the unnecessary sheet portion S1 by gradually pushing up the unnecessary sheet portion S1 by rotating the rotating shaft 40. According to this, the unnecessary sheet portion S1 is pushed out in a direction inclined with respect to the surface, and the extrusion resistance can be reduced.

Further, as shown in FIG. 8, the first and second die cut rollers 20 and 25 constituting the first and second die cut devices 15 and 17 have their rotation center axes positioned on substantially the same vertical line. The original fabric L may be sandwiched as a symmetrical arrangement.
With such a configuration, the anvil roller corresponding to each of the first and second die cut rollers can be omitted to simplify the configuration, and the length of the apparatus main body can be shortened.

  Furthermore, in the above embodiment, the original fabric L having a layer structure for forming the recording layer of the optical disc is targeted. However, the original fabric used as a protective sheet and a normal label used for information display are used. The original fabric can also be targeted.

  Moreover, in the said embodiment, although the strip | belt-shaped original fabric L of the three-layer structure where the sheet | seat FS was temporarily attached to the peeling sheet PS via the adhesive bond layer A was objected, the original fabric of the laminated body more than a four-layer structure is used. Can also be targeted. In short, what is necessary is just to perform what is called a half cut from the up-down direction with the die-cutting blade from which size differs on the basis of the interface to peel off, and to remove the unnecessary part.

  Further, the second die-cutting device 25 is not limited to being arranged on the downstream side in the feeding direction of the original fabric L with respect to the first die-cutting device 15, and may be arranged on the upstream side in the feeding direction.

Schematic front view of an adhesive sheet forming apparatus according to the present embodiment (A) is a schematic perspective view of the said apparatus, (B) is a principal part top view which shows the planar shape of each notch | incision. Sectional drawing which shows the state which formed the outer notch and the inner notch in the original fabric with the die-cutting apparatus. The A section enlarged view of FIG. Sectional drawing which shows the state which formed the cut for extraction with the 2nd die cut roller. The B section enlarged view of FIG. The schematic front view similar to FIG. 1 which shows a modification. Furthermore, the schematic front view similar to FIG. 1 which shows another modification. Sectional drawing similar to FIG. 3 which shows a prior art example. The C section enlarged view of FIG. Sectional drawing for demonstrating the conventional inconvenience at the time of peeling a peeling sheet. Sectional drawing for demonstrating the conventional inconvenience at the time of peeling a sheet | seat from an adhesive bond layer.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Outer notch 12 Inner notch 15 1st die-cutting device 16 Extraction notch 17 2nd die-cutting device 18 Removal device 28 Extruding device 29 Recovery device 40 Rotating shaft 41 Pin A Adhesive layer FS Sheet L Original fabric PS Release sheet S Adhesion Sheet S1 Unnecessary sheet part

Claims (6)

Targeting at least a three-layered belt-like raw material with a sheet temporarily attached to the release sheet via an adhesive layer, an outer cut and an inner cut are provided to reach the release sheet from the sheet side along a closed loop trajectory. And a first die-cutting device for forming an adhesive sheet having a predetermined planar shape, and a first cutting device for forming a cutting notch that reaches the adhesive layer along a closed loop trajectory from the release sheet side inside the inner notch. 2, a die cutting device, a sheet portion and an adhesive layer portion surrounded by the inner cut, and a removal device that removes the release sheet portion surrounded by the extraction cut as an unnecessary sheet portion. Bonding sheet forming device. The first die cutting device is arranged along the feeding direction of the original fabric, and the second die cutting device is arranged upstream or downstream in the feeding direction with respect to the first die cutting device. The apparatus for forming an adhesive sheet according to claim 1, wherein: The apparatus for forming an adhesive sheet according to claim 1, wherein the first die-cutting device and the second die-cutting device are arranged at symmetrical positions sandwiching the original fabric. The removal device is configured to include an extrusion device capable of advancing and retreating the unnecessary sheet portion in a direction of pushing out the unnecessary sheet portion from the release sheet side, and a recovery device for sucking the extruded unnecessary sheet portion. The apparatus for forming an adhesive sheet according to 1, 2 or 3. The removing device includes a pin provided on an outer peripheral surface portion of a rotating shaft disposed on the release sheet side and protruding in a radial direction of the rotating shaft, and a recovery device disposed on the sheet side, The apparatus for forming an adhesive sheet according to claim 1, 2 or 3, wherein the unnecessary sheet portion is pushed out and the unnecessary sheet portion is sucked into the collecting device. For bonding with a predetermined planar shape by forming a notch along the locus of a closed loop from the sheet side, intended for at least a three-layer belt-like raw material in which the sheet is temporarily attached to the release sheet via an adhesive layer In a method of forming a sheet,
After forming an outer cut and an inner cut reaching the release sheet from the sheet side to form a planar shape of the adhesive sheet,
From the release sheet side to the inside incision, forming a cutting cut for reaching the adhesive layer along a closed loop trajectory,
Then, the sheet | seat part and adhesive layer part enclosed by the said inner notch | incision, and the peeling sheet | seat part enclosed by the said cutting | notch | notch | notch | incision for cutting are extruded and removed as an unnecessary sheet | seat part, The formation method of the adhesive sheet characterized by the above-mentioned.

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