JP4698687B2 - Laminated sheet and method for producing the same - Google Patents

Description

  The present invention relates to a laminated sheet in which an adhesive sheet having a predetermined shape is laminated on a release sheet, and in particular, a laminated sheet that can reduce defects that can be formed on an adhesive sheet when it is used as a wound body. It is about.

  FIG. 12 shows a conventional laminated sheet used for laminating a cover sheet on the light receiving surface of an optical disc. As shown in FIG. 12, the laminated sheet 1P includes a long release sheet 2P and a cover sheet portion 301P (adhesive sheet) provided continuously in the longitudinal direction of the release sheet 2P. The cover sheet portion 301P includes an adhesive layer 31P and a light transmissive base material 32P, and has the same shape as the optical disc.

  The laminated sheet 1P is wound up in a roll shape, transported and stored in the state of a wound body, and pulled out from the wound body for use. Thus, when the laminated sheet 1P is used as a winding body, the other cover sheet portion 301P is wound around the cover sheet portion 301P. At this time, the cover sheet portion 301P has a winding pressure as shown in FIG. The outline mark (arc-shaped mark) of other cover sheet part 301P will be attached.

  In order to prevent the arc-shaped marks as described above from being attached to the cover sheet portion 301P, it may be possible to lower the winding pressure and wind up the laminated sheet 1P. There is a problem that the body tends to collapse.

  In addition, when winding the laminated sheet 1P, foreign matter such as fine dust (usually a diameter of 5 to 50 μm) may be sandwiched between the laminated sheets 1P to be wound. When the laminated sheet 1P is wound in such a state that the foreign matter is sandwiched in this way, a recess due to the foreign matter is formed in the cover sheet portion 301P.

  When the above-described arc-shaped marks or dents are formed on the cover sheet portion 301P, the conventional optical disc is not a big problem, but in the next generation optical disc (Blu-ray Disc) with a large capacity / high recording density. The arc-shaped marks and dents are disadvantageous, and an error may occur in reading data due to the defects.

  The present invention has been made in view of such a situation, and provides a laminated sheet that can prevent a defect from being formed on an adhesive sheet when a wound body is formed, and a method for manufacturing the same. With the goal.

  In order to achieve the above object, firstly, the present invention is a laminated sheet in which an adhesive sheet having a predetermined shape and a protective material are laminated at different positions on a long release sheet, The protective material is thicker than the adhesive sheet, and is provided so as not to overlap the adhesive sheet when the laminated sheet is used as a winding body. The adhesive sheet is bonded to the release sheet. A laminated sheet comprising an agent layer is provided (claim 1). In the release sheet, the protective material is preferably laminated on the same side as the adhesive sheet, but all or part of the protective material may be laminated on the opposite side of the adhesive sheet.

  In the above invention (invention 1), since the laminated sheet is provided with a protective material having a thickness larger than that of the adhesive sheet, when the laminated sheet is used as a winding body, the surface of the adhesive sheet and the wound sheet are wound around the surface. A gap is formed between the back surfaces of the overlapping release sheets. And the protective material is provided so that it may not overlap with an adhesive sheet, when a laminated sheet is used as a winding body. Therefore, when the laminated sheet is used as a wound body, the adhesive sheet is not strongly pressed against the outline of other adhesive sheets or protective materials, and therefore the adhesive sheet is prevented from being marked by winding pressure. Is done.

  Further, when winding the laminated sheet, there is a gap between the surface of the adhesive sheet and the back surface of the release sheet even if foreign matter such as fine dust is sandwiched between the laminated sheets that are wound. Since it exists, it is suppressed that the dent by a foreign material is formed in an adhesive sheet.

  As described above, according to the above invention (invention 1), it is possible to drastically reduce the defects that can be formed on the adhesive sheet when the laminated sheet is used as a wound body.

In the above invention (claim 1), wherein the adhesive sheet is provided a plurality continuously in the width direction central portion of the release sheet of the long, the protective material, both sides in the width direction of the release sheet of the long It is preferable to be provided in the section (claim 2). By setting the laminated sheet to such a configuration, it is possible to effectively reduce defects that can be formed on the adhesive sheet when the laminated sheet is used as a wound body.

  In the above inventions (Inventions 1 and 2), a gap may exist between the adhesive sheet and the protective material in a plan view (Invention 3).

  In the said invention (Invention 1-3), the pillow part which consists of the same material as the said adhesive sheet is laminated | stacked on the said elongate peeling sheet in the position different from the said adhesive sheet, On the said pillow part. Is provided with a protection part, and the protection material may be constituted by the protection part and the pillow part located under the protection part (Claim 4).

  In the said invention (invention 4), the said protection part is provided in the outer side edge part of the said pillow part, The planar shape of the said protection part is a strip | belt shape, and the planar shape of the said adhesive sheet is a disk shape, The planar shape of the pillow part is recessed toward the protection part side along the outer periphery of the adhesive sheet, and protrudes so as to enter between the adhesive sheets between the adhesive sheets. (Claim 5).

In the above inventions (Inventions 1 to 5), the adhesive layer of the adhesive sheet may be an adhesive layer that bonds the recording layer of the optical disc and the cover sheet substrate that protects the recording layer of the optical disc ( Claim 6).

  2ndly, this invention is a process which laminate | stacks the adhesive sheet and protective sheet which consist of a peeling sheet and an adhesive bond layer in order on a long peeling sheet, and when the obtained laminated sheet is used as a winding body Cutting the protective sheet so that the protective sheet and the adhesive sheet of the desired shape do not overlap, removing and removing unnecessary portions, and forming a protective material consisting of the remaining protective sheet and the adhesive sheet located therebelow And a step of cutting the adhesive sheet into a target shape, peeling off and removing unnecessary portions, and forming an adhesive sheet of the target shape (Claim 7). In addition, in laminating | stacking an adhesive sheet, it is preferable to laminate | stack an adhesive bond layer and a base material in order.

  Thirdly, the present invention provides a process for laminating an adhesive sheet composed of a release sheet and an adhesive layer on a long release sheet, and a protective part is provided on the adhesive sheet at an arbitrary stage. A step of forming a protective material comprising an adhesive sheet located below, and the purpose of the adhesive sheet so that the protective portion and the adhesive sheet of the desired shape do not overlap when the obtained laminated sheet is used as a winding body And a step of forming an adhesive sheet having a desired shape by cutting it into a shape and peeling off and removing unnecessary portions (claim 8). Examples of the method for providing the protective portion on the adhesive sheet include a method of sticking a tape with an adhesive to the adhesive sheet, a method of printing ink, or a method of applying paint.

  According to the said invention (Invention 7, 8), the said lamination sheet (Invention 1-6) can be manufactured efficiently.

  According to the laminated sheet of the present invention, it is possible to reduce defects that may be formed on the adhesive sheet when the wound body is formed. Moreover, according to the manufacturing method of the lamination sheet of this invention, when it is set as a winding body, the lamination sheet which can reduce the fault which can be formed in an adhesive sheet is obtained.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiment, a laminated sheet used for laminating a cover sheet on a recording layer in an optical disc manufacturing process will be described as an example. However, the present invention is not limited to this, and various laminated sheets can be used. Can be applied.

[First Embodiment]
1A to 1E are cross-sectional views showing a method for manufacturing a laminated sheet according to the first embodiment of the present invention, and FIG. 2 is a perspective view of the laminated sheet according to the first embodiment of the present invention. 3 is a plan view of the laminated sheet according to the embodiment, and FIG. 4 is a perspective view of the wound body of the laminated sheet according to the embodiment.

  In order to manufacture the laminated sheet 1A according to the present embodiment, first, as shown in FIG. 1A, the adhesive layer 31A, the base material 32A, and the protective sheet 4A are formed on the release treatment surface of the long release sheet 2A. Are sequentially stacked. The adhesive layer 31A and the base material 32A constitute the adhesive sheet 3A.

  As the release sheet 2A, a conventionally known one can be used. For example, a resin film such as a polyethylene terephthalate film or a polypropylene film, or paper such as glassine paper, clay coated paper, or laminated paper (mainly polyethylene laminated paper) is used. What was peel-processed with the silicone type release agent etc. can be used. The thickness of the release sheet 2A is usually about 10 to 200 μm, preferably about 20 to 100 μm.

  As the adhesive constituting the adhesive layer 31A, a pressure-sensitive adhesive is usually used, but is not limited thereto, and may be, for example, an energy ray curable adhesive. The type of pressure sensitive adhesive may be any of acrylic, polyester, urethane, rubber, silicone, etc., and may be a so-called pressure-sensitive adhesive or an adhesive. Good.

  In order to form the adhesive layer 31A, for example, a coating agent containing an adhesive constituting the adhesive layer 31A and, if desired, a solvent is prepared, and a kiss roll coater, a reverse roll coater, a knife coater, and a roll knife are prepared. What is necessary is just to apply | coat and dry to the peeling process surface of 2 A of peeling sheets with coating machines, such as a coater and a die coater. And base material 32A is crimped | bonded on adhesive layer 31A formed in this way, and it is set as adhesive sheet 3A which consists of adhesive layer 31A and base material 32A. The thickness of 31 A of adhesive bond layers is about 5-100 micrometers normally, Preferably it is about 10-30 micrometers.

  Examples of the base material 32A in the present embodiment include those constituting the light receiving surface of the optical disk as a cover sheet of the optical disk recording layer. The material of the base material 32A may be any material as long as it has sufficient light transmittance with respect to the wavelength range of light for reading information. However, in order to easily manufacture an optical disc, rigidity and flexibility are required. Something moderate is preferable, and it is preferable that the optical disk is stable with respect to temperature for storing the optical disk. As such a material, for example, a resin such as polycarbonate, polymethyl methacrylate, or polystyrene can be used.

  The linear expansion coefficient of the base material 32A is preferably substantially the same as the linear expansion coefficient of the optical disk substrate so that the optical disk does not warp at high temperatures. For example, when the optical disk substrate is made of polycarbonate resin, the base material 32A is preferably made of the same polycarbonate resin.

  The thickness of the base material 32A is determined according to the type of the optical disk and the thickness of other components of the optical disk, but is usually about 25 to 300 μm, and preferably about 50 to 200 μm.

  Further, as the base material 32A in the present embodiment, the same material as the release sheet 2A described above can be used. In this case, the release treatment surface of the substrate 32A is bonded to the adhesive layer 31A laminated on the release sheet 2A. According to such a laminated sheet, the release sheet 2A is peeled from the adhesive layer 31A, the exposed adhesive layer 31A is attached to the recording layer of the optical disc, and then the substrate 32A is peeled from the adhesive layer 31A. Then, another base material (a cover sheet base material for protecting the recording layer of the optical disk) can be bonded to the adhesive layer 31A.

  Although the material which comprises 4 A of protection sheets is not specifically limited, What laminated | stacked the adhesive bond layer on the base material which consists of a resin film, paper, metal foil, etc. is used preferably.

  Examples of the base material of the protective sheet 4A include polyethylene, polypropylene, polybutene, polybutadiene, vinyl chloride, ionomer, ethylene-methacrylic acid copolymer, polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polyimide, polyetherimide, and polyaramid. A resin film made of a resin such as polyether ketone, polyether ether ketone, polyphenylene sulfide, poly (4-methylpentene-1), polytetrafluoroethylene, or a cross-linked resin thereof, and a laminate of the resin films. It is preferred to use.

  The adhesive constituting the adhesive layer of the protective sheet 4A is preferably a pressure sensitive adhesive. In this case, the protective sheet 4A may be pressure-bonded onto the base material 32A of the adhesive sheet 3A. The type of pressure-sensitive adhesive may be any of acrylic, polyester, urethane, rubber, silicone, ethylene-vinyl acetate, etc., and may be a so-called adhesive or adhesive. It may be a dressing.

  The thickness of the protective sheet 4A is preferably 5 to 100 μm, particularly preferably 25 to 50 μm. When the thickness of the protective sheet 4A is less than 5 μm, the effect of the present invention cannot be sufficiently obtained. When the thickness of the protective sheet 4A exceeds 100 μm, the winding obtained when the laminated sheet 1A is wound up The body diameter (volume) becomes too large.

  After laminating the release sheet 2A, the adhesive sheet 3A and the protective sheet 4A as shown in FIG. 1 (a), only the protective sheet 4A is cut so as not to reach the adhesive sheet 3A as shown in FIG. 1 (b). The protective sheet 4A is divided into a protective part 41A on both sides in the width direction and a remaining part 42A in the central part in the width direction. The protective sheet 4A may be cut by a conventional method, for example, using a punching device or the like. Note that the width of the protection portion 41A is slightly narrower than the minimum width of the pillow portion 302A to be formed in a later step.

  The remaining part 42A of the protective sheet 4A formed by the above cut is peeled and removed as shown in FIG. 1C to form the protective part 41A.

  Next, as shown in FIG. 1 (d), the adhesive sheet 3A is cut so as not to reach the release sheet 2A, and the adhesive sheet 3A is divided into a cover sheet portion 301A, a pillow portion 302A, and a remaining portion 303A, and a cover is formed. A center hole portion 304A is formed by punching the center portion of the sheet portion 301A. The cutting and punching of the adhesive sheet 3A may be performed by a conventional method, for example, using a punching device or the like.

  As shown in FIGS. 2 and 3, the planar shape of the cover sheet portion 301 </ b> A has a disk shape that is the same as the shape of the optical disk. As shown in FIGS. 2 and 3, the planar shape of the pillow portion 302A is recessed toward the protective portion 41A along the outer periphery of the cover sheet portion 301A, and between the cover sheet portions 301A, It protrudes so as to enter between each other, and has a wave shape as a whole.

  Finally, as shown in FIG. 1E, the remaining portion 303A of the adhesive sheet 3A is peeled and removed. As shown in FIGS. 2 and 3, the laminated sheet 1 </ b> A manufactured in this way is a continuous release sheet 2 </ b> A and an adhesive sheet provided continuously at the center in the width direction of the release sheet 2 </ b> A release treatment surface. A plurality of disc-shaped cover sheet portions 301A composed of an agent layer 31A and a base material 32A, and a wavy shape composed of an adhesive layer 31A and a base material 32A provided on both sides in the width direction of the release sheet 2A release treatment surface A pillow portion 302A and a band-shaped protection portion 41A provided at the outer end of the pillow portion 302A are configured.

  In this laminated sheet 1A, the protection member 5A is a combination of the protection part 41A and the adhesive sheet 3A (pillow part 302A) located under the protection part 41A. The protective material 5A is thicker than the cover sheet portion 301A by the thickness of the protective portion 41A.

  When the laminated sheet 1A is wound into a roll as shown in FIG. 4 to form a wound body, the laminated sheet 1A is provided with a protective material 5A thicker than the cover sheet portion 301A. A slight gap is generated between the front surface of the sheet portion 301A and the back surface of the release sheet 2A wound thereon. Moreover, the protective material 5A (protective portion 41A) is positioned so as not to overlap the cover sheet portion 301A. Therefore, the cover sheet portion 301A is not strongly pressed by the contour portions of the other cover sheet portion 301A, the pillow portion 302A, and the protection portion 41A. Therefore, the cover sheet portion 301A is prevented from being marked by winding pressure. Is done.

  Further, when the laminated sheet 1A is wound up, even if foreign matter such as fine dust is sandwiched between the laminated sheets 1A that are wound, the surface of the cover sheet portion 301A and the back surface of the release sheet 2A Since there is a gap between them, if the diameter of the foreign matter is smaller than the size of the gap, it is possible to prevent the cover sheet portion 301A from forming a dent due to the foreign matter. Furthermore, in the conventional winding body, even if one foreign object is sandwiched, the effect is that a plurality of cover sheets that are wound will be recessed, but the laminated sheet 1A according to this embodiment. In this winding body, the release sheet 2A and the cover sheet portion 301A can be displaced by the size of the gap in the radial direction of the winding body, so that a foreign substance having a diameter larger than the size of the gap is covered by the cover sheet portion 301A. Even if it adheres, it is suppressed that the influence reaches other cover sheet part 301A, and it can prevent that the dent by a foreign material is formed in several cover sheet part 301A.

  In addition, although the pillow part 302A is provided in the laminated sheet 1A according to the present embodiment, the laminated sheet 1A is provided by providing the pillow part 302A having the same thickness as the cover sheet 301A in this way. The overall rigidity is ensured, and when the laminated sheet 1A is used as a winding body, there is an advantage that deformation of the winding body is suppressed.

  As described above, according to the laminated sheet 1A according to the present embodiment, it is possible to dramatically reduce the defects that can be formed in the cover sheet portion 301A when the laminated sheet 1A is used as a wound body.

[Second Embodiment]
FIGS. 5A to 5E are cross-sectional views showing a method for manufacturing a laminated sheet according to the second embodiment of the present invention, and FIG. 6 is a perspective view of the laminated sheet according to the second embodiment of the present invention. 7 is a plan view of the laminated sheet according to the embodiment, and FIG. 8 is a perspective view of the wound body of the laminated sheet according to the embodiment.

  In order to manufacture the laminated sheet 1B according to the present embodiment, first, as shown in FIG. 5A, the adhesive layer 31B, the base material 32B, and the protective sheet 4B are formed on the release treatment surface of the long release sheet 2B. Are sequentially stacked. The adhesive layer 31B and the base material 32B constitute the adhesive sheet 3B.

  As materials of the release sheet 2B, the adhesive layer 31B, the base material 32B, and the protective sheet 4B, the release sheet 2A, the adhesive layer 31A, the base material 32A, and the protective sheet 4A of the laminated sheet 1A according to the first embodiment described above Similar ones can be used.

  When the release sheet 2B, the adhesive sheet 3B, and the protective sheet 4B are stacked as shown in FIG. 5A, the protective sheet 4B and the adhesive sheet 3B are attached so as not to reach the release sheet 2B as shown in FIG. 5B. The protective sheet 4B is divided into a protection part 41B on both sides in the width direction and a remaining part 42B in the center part in the width direction, and the adhesive sheet 3B is divided into a protection part 302B on both sides in the width direction and a center part in the width direction. .

  The remaining part 42B of the protective sheet 4B formed by the above cutting is peeled and removed as shown in FIG. 5C to form the protective part 41B.

  Next, as shown in FIG. 5 (d), the adhesive sheet 3B is cut so as not to reach the release sheet 2B, and the widthwise central portion of the adhesive sheet 3B is divided into a cover sheet portion 301B and a remaining portion 303B. A center hole portion 304B is formed by punching the center portion of the cover sheet portion 301B. As shown in FIGS. 6 and 7, the planar shape of the cover sheet portion 301 </ b> B is a disk shape that is the same as the shape of the optical disk.

  Finally, as shown in FIG. 5E, the remaining portion 303B of the adhesive sheet 3B is peeled and removed. As shown in FIGS. 6 and 7, the laminated sheet 1 </ b> B manufactured in this way is a continuous release sheet 2 </ b> B and an adhesive provided continuously in the center in the width direction of the release sheet 2 </ b> B release treatment surface. A disc-shaped cover sheet portion 301B composed of the agent layer 31B and the base material 32B, and a belt-shaped protection portion composed of the adhesive layer 31B and the base material 32B provided on both sides in the width direction of the release sheet 2B release treatment surface. 302B and the band-shaped protection part 41B provided on the protection part 302B.

  In this laminated sheet 1B, the protection member 5B is a combination of the protection part 41B and the protection part 302B. The protective material 5B is thicker than the cover sheet portion 301B by the thickness of the protective portion 41B.

  When the laminated sheet 1B is wound up in a roll shape as shown in FIG. 8 to form a wound body, the laminated sheet 1B is provided with the protective material 5B thicker than the cover sheet portion 301B. A slight gap is generated between the front surface of the sheet portion 301B and the back surface of the release sheet 2B wound thereon. Moreover, the protective material 5B is positioned so as not to overlap the cover sheet portion 301B. For this reason, the cover sheet portion 301B is not strongly pressed by the other cover sheet portion 301B and the contour portion of the protective material 5B, so that the cover sheet portion 301B is prevented from being marked by winding pressure.

  Further, when the laminated sheet 1B is wound, even if foreign matter such as fine dust is sandwiched between the laminated sheets 1B, the surface of the cover sheet portion 301B and the back surface of the release sheet 2B Since there is a gap between them, if the diameter of the foreign matter is smaller than the size of the gap, it is possible to prevent the cover sheet portion 301B from forming a dent due to the foreign matter. Furthermore, in the conventional winding body, even when a single foreign object is sandwiched, the effect is that dents are formed in the multiple cover sheets that are wound, but the laminated sheet 1B according to this embodiment. In this winding body, the release sheet 2B and the cover sheet portion 301B can be displaced by the size of the gap in the radial direction of the winding body, so that a foreign substance having a diameter larger than the size of the gap is covered by the cover sheet portion 301B. Even if it adheres to the top, it is possible to prevent the influence from affecting other cover sheet portions 301B, and to prevent the formation of dents due to foreign matters on the plurality of cover sheets 301B.

  As described above, according to the laminated sheet 1B according to the present embodiment, it is possible to dramatically reduce the defects that can be formed in the cover sheet portion 301B when the laminated sheet 1B is used as a wound body.

[Third Embodiment]
9A to 9D are cross-sectional views illustrating a method for manufacturing a laminated sheet according to the third embodiment of the present invention.

  To manufacture the laminated sheet 1C according to the present embodiment, first, as shown in FIG. 9A, the adhesive layer 31C and the base material 32C are sequentially laminated on the release treatment surface of the long release sheet 2C. . The adhesive layer 31C and the base material 32C constitute the adhesive sheet 3C.

  As materials for the release sheet 2C, the adhesive layer 31C, and the base material 32C, the same materials as the release sheet 2A, the adhesive layer 31A, and the base material 32A of the laminated sheet 1A according to the first embodiment may be used. it can.

  When the release sheet 2C and the adhesive sheet 3C are laminated as shown in FIG. 9A, the adhesive sheet 3C is cut so as not to reach the release sheet 2C as shown in FIG. 9B, and the adhesive sheet 3C is covered. The sheet portion 301C, the pillow portion 302C, and the remaining portion 303C are divided, and the center portion of the cover sheet portion 301C is punched to form a center hole portion 304C.

  The planar shapes of the cover sheet portion 301C and the pillow portion 302C are the same as the planar shapes of the cover sheet portion 301A and the pillow portion 302A in the laminated sheet 1A according to the first embodiment (see FIGS. 2 and 3).

  The remaining portion 303C of the adhesive sheet 3C formed by the above cut is peeled and removed as shown in FIG. And finally, as shown in FIG.9 (d), the strip | belt-shaped protection part 41C is laminated | stacked on the outer side edge part of the pillow part 302A. The protective portion 41C may be configured by a sheet similar to the protective sheet 4A of the laminated sheet 1A according to the first embodiment, or may be formed by ink printing or paint application.

  The type of ink / paint and the printing / coating method are not particularly limited. For example, ink / paint containing a vehicle such as urethane resin or acrylic resin is printed by a method such as lithographic printing or letterpress, or sprayed. It can be applied by a method such as brushing.

  Even when the protective portion 41C is formed with the ink or paint as described above, the dry film thickness thereof is preferably 5 to 100 μm, particularly 25 to 50 μm, as in the case of the sheet. preferable.

  In addition, in this embodiment, although the lamination process of the said protection part 41C was performed last, it can carry out in arbitrary steps in the manufacturing process of the lamination sheet 1C, without being limited to this.

  The laminated sheet 1C produced as described above is composed of a long release sheet 2C, and an adhesive layer 31C and a base material 32C that are continuously provided in the center in the width direction of the release sheet 2C release treatment surface. A disc-shaped cover sheet portion 301C, a wavy pillow portion 302C composed of an adhesive layer 31C and a base material 32C provided on both sides in the width direction of the release sheet 2C release treatment surface, and an outer end of the pillow portion 302C And a band-shaped protection part 41C provided in the part (see FIGS. 2 and 3).

  In this laminated sheet 1C, the protective material 5C is a combination of the protective part 41C and the adhesive sheet 3C (pillow part 302C) located under the protective part 41C. The protective material 5C is thicker than the cover sheet portion 301C by the thickness of the protective portion 41C.

  When the laminated sheet 1C is wound into a roll to form a wound body, the cover sheet portion 301C is marked with a winding pressure, and the cover sheet is the same as the laminated sheet 1A according to the first embodiment. It is possible to prevent a recess due to foreign matter from being formed in the portion 301C.

[Other Embodiments]
The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, the protective portions 41A and 41C of the laminated sheets 1A and 1C are provided only on both sides of the cover sheet portion 301D as in the protective portion 41D of the laminated sheet 1D shown in FIG. May be provided intermittently so as to be interrupted.

  Further, the protective portions 41A and 41C of the laminated sheets 1A and 1C may be provided on both sides of the release sheet 2E in the width direction of the back surface like the protective portions 41E of the laminated sheet 1E shown in FIG. In such a laminated sheet 1E, the protection member 5E is a combination of the protection part 41E and the adhesive sheet 3E (pillow part 302E) positioned on the protection part 41E. The protective material 5E is thicker than the cover sheet portion 301E by the thickness of the protective portion 41E.

  EXAMPLES Hereinafter, although an Example etc. demonstrate this invention further more concretely, the scope of the present invention is not limited to these Examples etc.

[Example 1]
For 100 parts by weight of a copolymer obtained by copolymerizing 97 parts by weight of n-butyl acrylate and 3 parts by weight of 2-hydroxyethyl acrylate, a polyisocyanate compound (Takeda Pharmaceutical Co., Ltd., Takenate D- 1N parts by weight of 140N) and 200 parts by weight of toluene as a solvent were used as a pressure-sensitive adhesive coating agent.

  On the other hand, a protective sheet (SANA Chemical Co., Ltd., PAC2-70, thickness: 70 μm) in which an ethylene-vinyl acetate pressure-sensitive adhesive layer is provided on a polyethylene substrate is used as a polycarbonate film (Teijin Ltd.). Manufactured by Pure Ace C110-75, thickness: 75 μm) to obtain a substrate with a protective sheet.

  The thickness after drying the adhesive coating agent is 25 μm on the release treatment surface of a release sheet (SP-PET 3811, thickness: 38 μm, manufactured by Lintec Corporation) coated with a silicone release agent on one side of a polyethylene terephthalate film. Then, it was applied with a knife coater and dried at 100 ° C. for 3 minutes. The polycarbonate layer side of the base material with a protective sheet was pressure-bonded to the pressure-sensitive adhesive layer thus formed, and a long laminate having a width of 150 mm and a length of 100 m was produced.

  Next, using a punching device (Mark Andy 910, Mark Andy 910), as shown in FIG. 1 (b), the protective sheet is placed between the protective portions (width: 10 mm) on both sides in the width direction and the central portion in the width direction. The remainder was divided into the remaining portions, and the remaining portions were peeled and removed as shown in FIG.

  And using the said punching apparatus, as shown in FIG.1 (d), a base material and an adhesive layer (adhesion sheet) are made into a disk-shaped cover sheet part (diameter: 120 mm, 500 sheets), and a wavy pillow part. 1 and the remaining portion, and the center portion of the cover sheet portion was punched out to form a center hole portion, and the remaining portion was peeled and removed as shown in FIG.

  The laminated sheet thus manufactured (see FIGS. 2 and 3) was wound around an ABS core having a diameter of 3 inches with an initial winding tension of 12 N and a taper ratio of 50% to obtain a wound body (FIG. 4). reference).

[Example 2]
About the long laminated body produced like Example 1, as shown in FIG.5 (b) using a punching apparatus (the Mark Andy 910 make), a protection sheet, a base material, and an adhesive The layer was divided into a protective part (width: 10 mm) on both sides in the width direction and a central part in the width direction, and the central part in the width direction of the protective sheet was peeled off as shown in FIG.

  Then, using the punching device, as shown in FIG. 5 (d), the center portion in the width direction of the base material and the pressure-sensitive adhesive layer (adhesive sheet) is a disc-shaped cover sheet portion (diameter: 120 mm, 500 sheets). The center portion of the cover sheet portion was punched out to form a center hole portion, and the remaining portion was peeled and removed as shown in FIG.

  The laminated sheet thus manufactured (see FIGS. 6 and 7) was wound around a winding core under the same winding conditions as in Example 1 to obtain a wound body (see FIG. 8).

Example 3
A polyethylene terephthalate film (width: 10 mm, thickness: 25 μm) as a base material is coated with an acrylic pressure-sensitive adhesive (manufactured by Lintec Corporation, PL Thin) to a thickness of 20 μm to form a pressure-sensitive adhesive layer. This was used as an adhesive tape.

  After drying the adhesive coating agent prepared in Example 1 on the release treatment surface of a release sheet (SP-PET 3811, thickness: 38 μm, manufactured by Lintec Corporation) coated with a silicone release agent on one side of a polyethylene terephthalate film The film was coated with a knife coater so as to have a thickness of 25 μm and dried at 100 ° C. for 3 minutes. A base material made of a polycarbonate film (Pure Ace C110-75, manufactured by Teijin Ltd., thickness: 75 μm) is pressure-bonded onto the pressure-sensitive adhesive layer thus formed, and is a long 150 mm wide and 100 m long. A laminate was produced.

  Next, using a punching device (Mark Andy 910, Mark Andy 910), as shown in FIG. 9B, the base material and the pressure-sensitive adhesive layer (adhesive sheet) are formed into a disc-shaped cover sheet portion (diameter: 120 mm, 500 sheets), a wavy pillow portion and a remaining portion, and the center portion of the cover sheet portion was punched out to form a center hole portion, and the remaining portion was peeled and removed as shown in FIG.

  And as shown in FIG.9 (d), the said adhesive tape was affixed on the outer side edge part of the pillow part as a protection part. The laminated sheet thus manufactured (see FIGS. 2 and 3) was wound around a core under the same winding conditions as in Example 1 to obtain a wound body (see FIG. 4).

[Comparative Example 1]
In Example 1, a laminated sheet was produced in the same manner as in Example 1 except that the remaining part of the protective sheet was not peeled and removed, and the obtained laminated sheet was wound around the winding core under the same winding conditions as in Example 1. A winding body was obtained.

[Comparative Example 2]
In Example 3, a laminated sheet was produced in the same manner as in Example 3 except that the adhesive tape as the protective part was not applied, and the obtained laminated sheet was wound around the core under the same winding conditions as in Example 1. A wound body was obtained.

[Test example]
The laminated sheets used as the wound bodies in Examples 1 to 3 and Comparative Examples 1 and 2 were left for 1 week in an atmosphere of 23 ° C. and 50% relative humidity, and then the state of the cover sheet portion was observed by a mercury lamp projection method. . For the mercury lamp projection method, an adhesive sheet peeled off from the release sheet is placed between a mercury lamp (USHIO INC., Light source: SX-01250HQ, mercury lamp power supply: BA-H250) and a white projection screen, for projection. This was done by visually observing the projection of the adhesive sheet on the screen. The distance between the mercury lamp and the adhesive sheet was 170 cm, and the distance between the adhesive sheet and the projection screen was 30 cm.

  As a result, no defects were found in the cover sheet portions in the laminated sheets of Examples 1 to 3, but the cover sheet portions in the laminated sheets of Comparative Examples 1 and 2 had other cover sheet portions or pillow portions. Contour marks and dents due to foreign matter were observed.

It is sectional drawing which shows the manufacturing method of the lamination sheet which concerns on the 1st Embodiment of this invention. It is a perspective view of the lamination sheet which concerns on the 1st Embodiment of this invention. It is a top view of the lamination sheet which concerns on the same embodiment. It is a perspective view of the winding body of the lamination sheet which concerns on the same embodiment. It is sectional drawing which shows the manufacturing method of the lamination sheet which concerns on the 2nd Embodiment of this invention. It is a perspective view of the lamination sheet which concerns on the 2nd Embodiment of this invention. It is a top view of the lamination sheet which concerns on the same embodiment. It is a perspective view of the winding body of the lamination sheet which concerns on the same embodiment. It is sectional drawing which shows the manufacturing method of the lamination sheet which concerns on the 3rd Embodiment of this invention. It is a top view of the lamination sheet which concerns on other embodiment of this invention. It is sectional drawing of the lamination sheet which concerns on another embodiment of this invention. It is a perspective view of the conventional laminated sheet. It is a top view of the cover sheet part in the conventional lamination sheet.

Explanation of symbols

1A, 1B, 1C, 1D, 1E, 1P ... Laminated sheets 2A, 2B, 2C, 2D, 2E, 2P ... Release sheets 3A, 3B, 3C, 3E ... Adhesive sheets 301A, 301B, 301C, 301D, 301E, 301P
... Cover sheet (adhesive sheet with a predetermined shape / target shape)
5A, 5B, 5C, 5D, 5E ... protective material

Claims (8)

An adhesive sheet having a predetermined shape and a protective material are laminated to each other at a different position on a long release sheet,
The protective material is thicker than the adhesive sheet, and is provided so as not to overlap the adhesive sheet when the laminated sheet is a winding body,
The said adhesive sheet is comprised from a peeling sheet and an adhesive bond layer, The laminated sheet characterized by the above-mentioned. Wherein the adhesive sheet is provided a plurality continuously in the width direction central portion of the release sheet of the long, the protective material is provided on both sides in the width direction of the release sheet of the long The laminated sheet according to claim 1.   The laminated sheet according to claim 1 or 2, wherein a gap exists between the adhesive sheet and the protective material in a plan view. In the long release sheet, a pillow part made of the same material as the adhesive sheet is laminated at a position different from the adhesive sheet, and a protective part is provided on the pillow part,
The said protective material is comprised from the said protection part and the said pillow part located under the said protection part, The laminated sheet in any one of Claims 1-3 characterized by the above-mentioned. The protection part is provided at an outer end of the pillow part, and the planar shape of the protection part is a belt shape,
The planar shape of the adhesive sheet is a disc shape,
The planar shape of the pillow part is recessed toward the protection part side along the outer periphery of the adhesive sheet, and protrudes so as to enter between the adhesive sheets between the adhesive sheets. The laminated sheet according to claim 4, wherein the laminated sheet is formed. 6. The adhesive layer of the adhesive sheet is an adhesive layer that bonds a recording layer of an optical disc and a cover sheet base material that protects the recording layer of the optical disc. Laminated sheet. A step of laminating an adhesive sheet composed of a release sheet and an adhesive layer and a protective sheet in order on a long release sheet;
When the obtained laminated sheet is used as a winding body, the protective sheet is cut so that the protective sheet and the adhesive sheet of the target shape do not overlap, and unnecessary portions are peeled and removed, and the remaining protective sheet and the position below it Forming a protective material comprising an adhesive sheet to be
A process for producing a laminated sheet comprising: a step of cutting the adhesive sheet into a target shape, peeling off and removing unnecessary portions, and forming an adhesive sheet of the target shape. Laminating an adhesive sheet composed of a release sheet and an adhesive layer on a long release sheet;
Providing a protective part on the adhesive sheet at an arbitrary stage, and forming a protective material comprising the protective part and an adhesive sheet located under the protective part;
When the obtained laminated sheet is used as a wound body, the adhesive sheet is cut into a target shape so that the protective part and the adhesive sheet of the target shape do not overlap, and an unnecessary part is peeled and removed, and the adhesive sheet of the target shape A process for producing a laminated sheet comprising the step of forming

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