JP2018159051A - Adhesive sheet, laminate, and method for producing adhesive sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive sheet that has an improved effect of preventing curling of a base material after peeling.SOLUTION: An adhesive sheet has a surface base material, peeling agent layers, an adhesive layer, and an intermediate substrate, in the stated order. The peeling agent layers are scattered on the surface base material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an adhesive sheet, a laminate, and an adhesive sheet manufacturing method in which substrates are bonded together in a peelable manner.

  In a laminate in which substrates are bonded to each other so that they can be peeled, adhesion can be maintained in a normal state, and when the substrates are separated by a predetermined peeling force, they are peeled without destroying the surface of the substrate. There is a possible form of adhesion called “pseudo-adhesion”.

  In “pseudo-adhesion”, once the substrate is peeled off, it cannot be bonded again. Such adhesive properties can be applied to labels and the like.

  For example, in the physical distribution field, an adhesive sheet in which substrates are pseudo-bonded is applied to a “delivery slip”. In such a delivery slip, the base materials are adhered to each other under delivery, and the surface base material is attached to the adherend as “address / destination”. When the delivery is completed, the delivery company can peel off only the surface base material from the delivery slip and take it home. That is, the surface base material can be handled as a “record slip”.

  However, in the adhesive sheet, the peeled substrate may curl due to the peeling stress when peeling the substrate. As a result, the peeled “record slip” may become difficult to handle.

  On the other hand, the technique for relieving the curl produced when the pseudo-adhered substrates are separated from each other has been proposed (see Patent Document 1).

JP 2014-170203 A

  In the label disclosed in Patent Document 1, it has been attempted to alleviate curl by giving a characteristic to the structure of the adhesive layer and the release layer that form the pseudo-adhesive structure. However, there was still room for improvement in practical use.

  Therefore, an object of the present invention is to enhance the curl suppressing effect of the substrate after being peeled off in the pseudo-bonded substrate.

  According to an aspect of the present invention, there is provided an adhesive sheet having a surface base material and an intermediate base material, the surface base material, the release agent layer, the adhesive layer, and the intermediate base material in this order. Provided, and an adhesive sheet in which the release agent layer is disposed in a scattered manner on the surface base material.

  According to the above aspect, in the pseudo-adhered base material, the curl suppressing effect of the base material after being peeled can be enhanced.

FIG. 1 is a cross-sectional view illustrating an adhesive sheet 10 and a laminate 1 according to an embodiment of the present invention. FIG. 2 is a plan view illustrating a disposition pattern of the release agent layer 12 in the laminate 1 according to the embodiment of the present invention, with a part of the laminate cut away. FIG. 3 is a plan view of the laminate 1 according to the embodiment of the present invention as viewed from the surface base material 11 side. FIG. 4 is a plan view illustrating the arrangement pattern of the release agent layer 12 in the laminate 1 according to the embodiment of the present invention, with a part of the laminate cut away. FIG. 5 is a plan view illustrating a disposition pattern of the release agent layer 12 in the laminate 1 according to the embodiment of the present invention, with a part of the laminate cut away. FIG. 6 is a plan view illustrating a disposition of the release agent layer 12 in the laminate 1 according to the embodiment of the present invention, with a part of the laminate cut away. FIG. 7 is a plan view illustrating a disposition pattern of the release agent layer 12 in the laminate 1 according to the embodiment of the present invention, with a part of the laminate cut away. FIG. 8 is a schematic diagram illustrating the adhesive sheet manufacturing apparatus 100 according to the embodiment of the present invention.

[Description of Adhesive Sheet and Laminate]
Hereinafter, the adhesive sheet 10 and the laminated body 1 which concern on embodiment of this invention are demonstrated using drawing. FIG. 1 is a cross-sectional view illustrating an adhesive sheet 10 and a laminate 1 according to an embodiment of the present invention.

  In the present embodiment, the “pseudo-adhesion” is an adhesive state in which the adhesive state can be maintained in a normal state and can be peeled without destroying the surfaces of the substrates by applying a predetermined peeling force. That means.

(Adhesive sheet)
The adhesive sheet 10 according to the embodiment of the present invention includes a surface base material 11, a release agent layer 12, an adhesive layer 13, and an intermediate base material 14 in this order, and the surface base material 11 is bonded. It is pseudo-adhered to the intermediate substrate 14 via the agent layer 13.

  In the adhesive sheet 10 according to the present embodiment, a release agent layer 12 is formed on one surface of the surface substrate 11, and the release agent layer 12 is disposed on the surface of the surface substrate 11. Details of the arrangement pattern of the release agent forming the release agent on the surface substrate 11 will be described later.

  In the adhesive sheet 10 according to the present embodiment, the adhesive layer 13 is formed in a predetermined region on the surface of the intermediate substrate 14.

  In the adhesive sheet 10 according to this embodiment, the surface base material 11 and the intermediate base material 14 are pseudo-bonded by the release agent layer 12 and the adhesive layer 13. For this reason, although the surface base material 11 can be peeled from the intermediate base material 14, it cannot be bonded again after peeling.

(Laminate)
In the laminate 1 according to the embodiment of the present invention, the adhesive layer 15 is formed on the surface opposite to the surface of the adhesive sheet 10 on which the adhesive layer 13 of the intermediate base material 14 is formed. A release sheet 16 is arranged via 15.

  The laminated body 1 which concerns on this embodiment can be stuck to a to-be-adhered body by the sticking layer 15 exposed when the peeling sheet 16 peels from the intermediate | middle base material 14. FIG. Therefore, the laminated body 1 can peel the surface base material 11 from the intermediate base material 14 in a state of being stuck to the adherend.

[Description of each layer]
Subsequently, each layer of the laminate 1 and the adhesive sheet 10 according to the present embodiment will be described.

<Surface base material>
As the surface base material 11 in the adhesive sheet 10 according to the present embodiment, a paper base material or a resin film base material can be used.

  As the paper substrate, kraft paper, fine paper, art paper and coated paper coated with pigment on the surface of fine paper, gloss paper coated with glossy pigment on the surface of fine paper, and metal foil bonded to the paper Foil paper, special paper, glassine paper, thermal paper, etc. can be used. In the present embodiment, thermal paper is used as an example of the surface substrate 11.

  Moreover, as a resin film base material, a polyester film, a polyethylene film, a vinyl chloride film, a polystyrene film, a paper-like film made mainly of a synthetic resin, an ABS film, a polypropylene film, or the like can be used.

  If the surface base material 11 is too thin, it may be curled or torn during peeling. If it is too thick, it is difficult to bend and peel off. From this viewpoint, the thickness of the surface base material 11 is preferably 70 μm or more and 95 μm or less, and more preferably 75 μm or more and 90 μm.

<Release layer>
In the present embodiment, the release agent layer 12 has the release agent scattered on the surface base material 11. That is, the release agent layer 12 is applied to the surface of the surface base material 11 in a predetermined pattern. The application pattern of the release agent layer 12 will be described later.

  Examples of the release agent that can be used for the release agent layer 12 include so-called release varnish. As the release varnish, a solventless silicone release agent, a solvent type silicone release agent, or the like can be used. Moreover, when the surface base material 11 is a resin film, the silicone release agent for films can be used.

  The silicone release agent can adjust the adhesive force with the adhesive layer 13 by adjusting the silicone content. If the silicone content is increased, the adhesive strength can be reduced and the peelability can be improved.

  In the present embodiment, as an example, a peeling varnish “manufactured by T & K TOKA Corporation, product name: MC315 OP varnish” can be used.

  Moreover, flexographic printing is mentioned as a method of apply | coating the release agent layer 12 to a surface base material. Among them, flexographic printing using an anilox roll having 600 lines and a groove volume of 5.5 cc on the line is mentioned.

  The silicone content in the silicone release agent can be 3 parts by mass or more and 10 parts by mass or less of silicone with respect to 100 parts by mass of the release agent resin composition.

  The adjustment of the adhesive force by the release agent layer 12 does not depend on the thickness. For this reason, even if it is too much, it leads to material loss. From this viewpoint, the thickness of the release agent layer 12 is preferably 0.5 μm or more and 1.5 μm or less, and more preferably 0.7 μm or more and 1.3 μm or less.

<Intermediate base material>
In the present embodiment, a paper substrate or a film substrate can be used as the intermediate substrate 14. As a paper base material, high-quality paper, art paper and paper coated with a pigment on the surface of high-quality paper, glossy gloss paper coated with a pigment on the surface of high-quality paper, foil paper bonded with metal foil on paper, Special paper, glassine paper, thermal paper, etc. can be used.

  Moreover, as a film base material, a polyester film, a polyethylene film, a vinyl chloride film, a polystyrene film, a paper-like film mainly made of a synthetic resin, an ABS film, a polypropylene film, or the like can be used.

  In the previous stage of laminating the surface base material 11, for example, considering the handleability and strength of the intermediate base material 14 alone when printing on the surface of the intermediate base material 14, the thickness of the intermediate base material 14 is 35 μm. The thickness is preferably 55 μm or less, and more preferably 40 μm or more and 50 μm.

<Adhesive layer>
The adhesive layer 13 is disposed on the entire surface of the intermediate substrate 14. In the present embodiment, examples of the adhesive that can form the adhesive layer 13 include a hot-melt adhesive, an emulsion adhesive, and a solvent adhesive. Among these, it is preferable to use a hot melt adhesive.

  The hot melt adhesive is heated and melted when applied to the surface of the surface substrate. Specifically, it is applied by a roll coater or the like while being heated to 160 ° C. to 180 ° C.

From the viewpoint of maintaining pseudo-adhesion between the adhesive layer 13 and the surface base material 11, the application amount of the adhesive layer 13 is preferably 20 g / m ² or more and 30 g / m ² or less. The thickness of the adhesive layer 13 is preferably 20 μm or more and 30 μm or less.

  In the present embodiment, as an example of an adhesive that forms the adhesive layer 13, a product name: Morescommelt Excess Peel manufactured by MORESCO Co., Ltd. can be used.

  The hot melt adhesive can be bonded again by reheating. Therefore, even if the adhesion of the surface base material 11 fails, there is an advantage that it is not discarded.

  Further, the hot melt adhesive has flexibility in a temperature range of −30 ° C. to 60 ° C. and can follow excessive bending. Moreover, in the state before thermocompression bonding, it is non-tacky (that is, adhesiveness is low) in a temperature range of −30 ° C. to 60 ° C. For this reason, the hot melt adhesive is excellent in handleability because it can be wound up in a roll shape when the material is supplied before production without performing a separator and a mold release treatment.

<Adhesion layer>
In the present embodiment, the adhesive layer 15 is formed on the surface opposite to the surface on which the adhesive layer 13 of the intermediate base material 14 is formed. In the present embodiment, the adhesive layer 15 is either a pressure-sensitive adhesive layer formed from a pressure-sensitive adhesive or an adhesive layer formed from an adhesive.

  When the adhesive layer 15 is a pressure-sensitive adhesive layer, the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer includes an acrylic pressure-sensitive adhesive, a urethane-based pressure-sensitive adhesive, a silicone-based pressure-sensitive adhesive, a natural rubber-based pressure-sensitive adhesive, and a synthetic rubber-based pressure-sensitive adhesive. Can be used.

  When using an adhesive, if there is little quantity of the adhesive to use, it will become difficult to ensure the adhesive force with a to-be-adhered body, and even if it is too much, it will lead to material loss. From this viewpoint, the thickness of the adhesive layer 15 is 10.5 μm or more and 13.5 μm or less, and preferably 11.5 μm or more and 12.5 μm or less.

  When the adhesive layer 15 is an adhesive layer, an acrylic adhesive, a urethane adhesive, a silicone adhesive, a natural rubber adhesive, or the like can be used as the adhesive that forms the adhesive layer. Moreover, as an adhesive form, an emulsion adhesive, a solvent adhesive, and a hot melt adhesive can be used.

  When using an adhesive, as with the pressure-sensitive adhesive, if the amount of the adhesive used is small, it becomes difficult to secure an adhesive force with the adherend, and even a large amount leads to material loss. From this viewpoint, the thickness of the adhesive layer 15 is 10.5 μm or more and 13.5 μm or less, and preferably 11.5 μm or more and 12.5 μm or less.

<Peeling sheet>
In the present embodiment, the release sheet 16 has a release sheet layer for release sheet formed on the surface of the release sheet substrate. As the release sheet substrate, glassine paper, high-quality paper, a resin film, or the like can be used.

  Moreover, as a release agent for release sheets, a solvent type silicone release agent, a solventless type silicone release agent, and an emulsion type silicone release agent can be used.

  The release sheet 16 is obtained by applying a release sheet release agent such as a silicone release agent to the release sheet base material, and then heating the release sheet 16 in a drying furnace to cure the release sheet release agent.

  As the base material for the release sheet, any material can be used as long as it is the material mentioned as the surface base material 11 or the intermediate base material 14 described above. Moreover, as the release agent for release sheet, the release agent that forms the release agent layer 12 described above can be applied.

  The thickness of the release sheet substrate is 34 μm or more and 54 μm or less, and preferably 39 μm or more and 49 μm or less, from the viewpoint of ease of peeling. Moreover, the thickness of the release agent layer for release sheet is 0.5 μm or more and 1.5 μm or less, and preferably 0.7 μm or more and 1.3 μm or less.

[Description of Arrangement Pattern of Release Agent Layer]
Next, the arrangement pattern of the release agent layer 12 applicable to the adhesive sheet 10 and the laminate 1 according to the present embodiment will be described in detail.

(First arrangement pattern)
FIG. 2 is a plan view illustrating a first arrangement pattern of the release agent layer 12 in the laminate 1 according to the present embodiment, with a part of the laminate cut away. FIG. 2 is a plan view seen from the release sheet 16 side.

  FIG. 2 shows a state in which an arrangement pattern of the release agent layer 12 is formed on the surface base material 11, an intermediate base material 14 is laminated thereon, and a release sheet 16 is further laminated. ing. In the notch part of FIG. 2, it is drawn so that the release agent layer 12 formed in the surface base material 11 may be exposed.

  In the present embodiment, the release agent is disposed on the surface of the surface substrate 11 in a dot pattern. In the halftone dot region, the ratio of the region where the release agent is disposed can be 60% or more per unit area. That is, the arrangement area of the release agent layer 12 per unit area of the surface substrate 11 can be 60% or more. If it is less than 60%, the adhesive force of the adhesive layer 13 is too effective and it becomes difficult to peel off. Moreover, since it becomes difficult to peel, the curl which arises after peeling the surface base material 11 becomes large, and is unpreferable.

(Second arrangement pattern)
FIG. 3 is a plan view of the laminate 1 according to the embodiment of the present invention as viewed from the surface base material 11 side. FIG. 4 is a plan view illustrating a second arrangement pattern of the release agent layer 12 in the laminate 1 according to this embodiment, with a part of the laminate cut away. FIG. 4 is a plan view seen from the release sheet 16 side.

  In the case of the second arrangement pattern, as shown in FIG. 3, the peeling direction is given to the user on a part of the surface base material 11 so that the peeling direction corresponds to the arrangement pattern formed on the laminate 1. A mark 11M for notification is printed. For example, the characters “Please peel in this direction” may be printed. The arrow P shown in FIG. 3 from the peel start end to the peel end end is referred to as the peel direction.

  In the laminate 1 shown in FIG. 4, the release agent layer 12 includes a halftone dot region 12 </ b> D where the release agent is arranged in a dot pattern on the surface base material 11, and a solid coating region 12 </ b> S where the release agent is arranged in a predetermined region. And have. In FIG. 4, the peeling direction P is set so that the surface base material 11 is peeled toward the back side of the paper surface and the upper right side of the paper surface.

  As the second arrangement pattern, in the laminate 1 shown in FIG. 4, the halftone dot region 12D and the solid coating region 12S are formed along the peeling direction P of the surface base material 11, respectively. The coating regions 12S are alternately arranged in the direction intersecting with the peeling direction P.

(Third arrangement pattern)
FIG. 5 is a plan view illustrating a third arrangement pattern of the release agent layer 12 in the laminate 1 according to this embodiment, with a part of the laminate cut away. FIG. 5 is a plan view seen from the release sheet 16 side.

  In the third arrangement pattern, as in the case of the second arrangement pattern, as shown in FIG. 3, a part of the surface base material 11 is formed so as to have a peeling direction corresponding to the arrangement pattern formed on the laminate 1. A mark 11M for informing the user of the peeling direction is printed. Thereby, in FIG. 5, the peeling direction P is set so that the surface base material 11 is peeled toward the back side of the paper and the upper right side of the paper.

  In the laminate 1 shown in FIG. 5, the release agent layer 12 includes a halftone dot region 12 </ b> D where the release agent is arranged in a halftone dot pattern on the surface substrate 11, and a solid coating region 12 </ b> S where the release agent is arranged in a predetermined region. Are formed in a wave shape along the peeling direction P of the surface substrate 11, and the halftone dot regions 12D and the solid coating regions 12S are alternately arranged in a direction intersecting with the peeling direction P, respectively. .

(4th arrangement pattern)
FIG. 6 is a plan view illustrating a fourth arrangement pattern of the release agent layer 12 in the laminate 1 according to this embodiment, with a part of the laminate cut away. FIG. 6 is a plan view seen from the release sheet 16 side.

  In the case of the fourth arrangement pattern, as in the case of the second arrangement pattern, as shown in FIG. 3, the surface base material 11 is arranged in a peeling direction corresponding to the arrangement pattern formed on the laminate 1. A mark 11M for informing the user of the peeling direction is printed on a part of the mark. Thereby, in FIG. 6, the peeling direction P is set so that the surface base material 11 is peeled toward the back side of the paper surface and the upper right side of the paper surface.

  In the laminate 1 shown in FIG. 6, the release agent layer 12 includes a halftone dot region 12 </ b> D where the release agent is arranged in a dot pattern on the surface base material 11, and a solid coating region 12 </ b> S where the release agent is arranged in a predetermined region. Are alternately formed in the peeling direction P, and are alternately formed in a direction intersecting the peeling direction P.

(Fifth arrangement pattern)
FIG. 7 is a plan view illustrating a fifth arrangement pattern of the release agent layer 12 in the laminate 1 according to the present embodiment, with a part of the laminate cut away. FIG. 7 is a plan view seen from the release sheet 16 side.

  In the case of the fifth arrangement pattern, as in the case of the second arrangement pattern, as shown in FIG. 3, the surface base material 11 is arranged so as to have a peeling direction corresponding to the arrangement pattern formed on the laminate 1. A mark 11M for informing the user of the peeling direction is printed on a part of the mark. Thereby, in FIG. 7, the peeling direction P is set so that the surface base material 11 is peeled toward the back side and the upper right side of the page.

  In the laminate 1 shown in FIG. 7, the release agent layer 12 includes a halftone dot region 12D in which the release agent is arranged in a halftone dot pattern on the surface base material 11, and a solid coating region 12S in which the release agent is arranged in a predetermined region. Are alternately formed in a wave shape along the peeling direction P, and are alternately formed in a direction crossing the peeling direction P.

(effect)
According to the adhesive sheet 10 and the laminate 1 according to the present embodiment described with reference to FIG. 1 and FIG. It is formed as. Thereby, the effect of the adhesive force of the adhesive layer 13 can be appropriately suppressed, and the peeling stress applied to the surface substrate 11 at the time of peeling can be suppressed. For this reason, curling of the surface base material 11 after peeling is unlikely to occur.

  Moreover, according to this embodiment demonstrated using FIGS. 3-7, when the surface base material 11 peels in the peeling direction P by being formed in the surface base material 11 by the predetermined arrangement pattern. Moreover, the halftone dot region 12D of the release agent and the solid coating region 12S coexist at the boundary between the peeled portion and the sticking portion that move in the peeling direction P. For this reason, while the surface base material 11 is peeled in the peeling direction P, local spots are hardly generated in the peeling stress applied to the surface base material 11, and curling is hardly generated.

  In the embodiment described above, if the predetermined information is printed on the surface base material 11 of the laminate 1, the surface base material 11 is peeled from the laminate 1 and the predetermined information printed on the surface base material 11 is printed. Can be separated.

  Also, predetermined information can be printed on the surface of the intermediate substrate 14 on the surface substrate 11 side. In this case, when the surface base material 11 is peeled off, the information printed on the surface of the intermediate base material 14 is exposed.

  Such a laminate 1 can be applied to, for example, a “delivery slip”. The laminate 1 is attached to the adherend as “address / destination” in a state in which the surface base material 11 and the intermediate base material 14 are pseudo-bonded via the adhesive layer 15 that is exposed by peeling the release sheet 16. Can be attached.

  In this state, since the laminated body 1 can peel the surface base material 11, when delivery is completed, a delivery company can peel only the surface base material 11 from a delivery slip, and can take it home. That is, the surface base material can be handled as a “record slip”.

  Moreover, the surface base material 11 can be peeled from the laminated body affixed to the product, and this can be handled as an “application ticket” or the like, and can be applied to sales promotion applications.

[Method and apparatus for producing adhesive sheet]
<Adhesive sheet manufacturing method>
Next, a method for manufacturing the adhesive sheet 10 according to this embodiment will be described. The manufacturing method of the adhesive sheet is such that the surface on the release agent layer side of the surface base material 11 on which the release agent layer 12 is formed faces the surface on the adhesive layer side of the intermediate base material 14 on which the adhesive layer 13 is formed. And a step of pressure bonding.

  According to this method for manufacturing an adhesive sheet, an adhesive sheet that hardly curls after the surface substrate 11 is peeled off can be manufactured.

<Adhesive sheet manufacturing equipment>
The adhesive sheet manufacturing apparatus 100 for performing the above manufacturing method will be described below. FIG. 8 is a schematic diagram illustrating the adhesive sheet manufacturing apparatus 100 according to the embodiment of the present invention.

  The adhesive sheet manufacturing apparatus 100 includes a supply shaft 101 that is mounted with a surface base material roll 11 </ b> R formed by winding a continuous body of the surface base material 11 and supplies the continuous body of the surface base material 11. In the present embodiment, the surface of the continuous body of the surface base material 11 is wound with the release agent layer 12 applied in a predetermined arrangement pattern with the application surface of the release agent layer 12 inside.

  Further, the adhesive sheet manufacturing apparatus 100 includes a supply shaft 102 to which an intermediate base material roll 14 </ b> R formed by winding a continuous body of the intermediate base material 14 is mounted and which supplies the continuous body of the intermediate base material 14.

  The adhesive sheet manufacturing apparatus 100 includes a printing unit 103 that performs predetermined printing on a continuous body of the intermediate base material 14 supplied from the supply shaft 102, and a coater that applies the adhesive layer 13 to the intermediate base material 14 after printing. 104. The coater 104 melts a hot melt adhesive for forming the adhesive layer 13 at a predetermined temperature and applies it to a predetermined region of the intermediate substrate 14.

  Moreover, the adhesive sheet manufacturing apparatus 100 includes crimping rolls 105 and 106 for crimping the continuous body of the surface base material 11 and the continuous body of the intermediate base material 14.

  In addition, the adhesive sheet manufacturing apparatus 100 includes conveyance rollers 111 and 112 that convey the continuous body of the surface base material 11 on which the arrangement pattern of the release agent layer 12 is formed to the positions of the pressure rolls 105 and 106 while applying tension. Conveying rollers 113 and 114 for conveying the continuum of the base material 14 to the positions of the pressure-bonding rolls 105 and 106 while applying tension.

  Moreover, the adhesive sheet manufacturing apparatus 100 includes a transport roller 115 that transports the adhesive sheet 10 formed by pressure bonding.

  According to the adhesive sheet manufacturing apparatus 100 described above, the intermediate base material on which the continuous body of the surface base material 11 on which the arrangement pattern of the release agent layer 12 is formed is supplied by the supply shaft 101 and the adhesive layer 13 is formed. 14 is supplied by the supply shaft 102, and in the pressure rolls 105 and 106, the arrangement pattern of the release agent layer 12 in the continuous body of the surface base material 11 and the adhesive layer 13 in the continuous body of the intermediate base material 14 are Crimp them facing each other. Thereby, the adhesive sheet 10 is formed.

  In the subsequent unit (not shown), the adhesive sheet 10 is applied with the adhesive layer 15 on the surface opposite to the surface on which the surface base material 11 of the intermediate base material 14 is disposed, and the release sheet 16 is further interposed via the adhesive layer 15. Are stacked. Thereby, the laminated body 1 is formed.

  According to the above-described adhesive sheet manufacturing apparatus 100, instead of applying the hot melt adhesive to a predetermined region of the intermediate base material 14 by the coater 104, a pseudo adhesive force is obtained by applying the release agent layer 12 in a predetermined pattern. Can be adjusted.

  For this reason, in the adhesive sheet manufacturing apparatus 100, good peelability can be obtained even when a hot melt adhesive that has been conventionally high in melt viscosity and difficult to form an arrangement pattern is used. Therefore, curling of the surface base material 11 when the surface base material 11 is peeled can be suppressed.

  Moreover, according to the adhesive sheet manufacturing apparatus 100 according to the present embodiment, since the hot melt adhesive having a high melt viscosity is used for forming the adhesive layer 13, the adhesive can be prevented from infiltrating into the intermediate base material 14. Therefore, it is not necessary to form the sealing layer before forming the adhesive layer 13 on the intermediate substrate 14.

  Moreover, the adhesive sheet manufacturing apparatus 100 according to the present embodiment can print predetermined information on the intermediate base material 14. Thereby, when the surface base material 11 is peeled, the predetermined information printed on the intermediate base material 14 is exposed.

  Therefore, for example, when the laminate 1 is used as a sales promotion product to be affixed to a product, the surface base material 11 can be used as an “application ticket”. It is possible to use information on products printed on the material 14, manufacturer information, greetings, etc.

[Other Embodiments]
The above-described embodiment of the present invention can be variously modified without departing from the spirit of the present invention. In the adhesive sheet manufacturing apparatus 100, a continuous body of the surface base material 11 on which the release agent pattern is formed in advance is used, but the step of forming the release agent layer 12 in a predetermined arrangement pattern on the continuous body of the surface base material 11 and this You may provide the unit for performing a process.

  As a method of applying the release agent to the surface substrate 11 in a predetermined arrangement pattern, gravure coating, ink jet coating, or the like can be used.

  Moreover, in the adhesive sheet manufacturing apparatus 100, as a method of forming the adhesive layer 13 using a hot melt adhesive, curtain coating, slot coating, spray coating, or the like can be used.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. is not.

  Hereinafter, based on an Example, this invention is demonstrated in detail. The present invention is not limited to these examples.

[Preparation of specimen]
A specimen for a laminate for measuring peel force was prepared by the following method.
The used base material, release agent for release layer, adhesive for pseudo-adhesion, intermediate base material, etc. are as follows.
Surface substrate: Thermal paper 1 “Mitsubishi Paper Co., Ltd., product number NT-100”
Surface base material: Thermal paper 2 “Mitsubishi Paper Co., Ltd., product number P220AB”
Peeling agent: Peeling varnish “T & K TOKA Co., Ltd., product name: MC315 OP varnish”
Adhesive for pseudo-adhesion: Hot melt adhesive “MORESCO Co., Ltd., product name: Excel peel TNT-725” Intermediate substrate: High-quality tack paper “Daiou Paper Co., Ltd.”

<Pattern of release agent layer>
The release agent layer prepared the following arrangement pattern.
・ Pattern 1
It was applied to the surface substrate with a halftone dot of 100% (that is, solid coating). A layer thickness of 83 μm combining the surface base material after coating and the release agent
Pattern 2 (corresponding to the first arrangement pattern described above)
It was applied to the surface substrate with a halftone dot of 80%. The thickness of the surface base material after coating and the release agent combined is 88 μm.
Pattern 3 (corresponding to the first arrangement pattern described above)
The surface substrate was coated with a halftone dot of 70%. The thickness of the combined surface base material and release agent after application is 83 μm.
Pattern 4 (corresponding to the first arrangement pattern described above)
It was applied to the surface substrate with a halftone dot of 60%. The thickness of the combined surface base material and release agent after application is 83 μm.
Pattern 5 (corresponding to the first arrangement pattern described above)
It was applied to the surface substrate with a halftone dot of 40%. A thickness of 82 μm in which the surface base material after coating and the release agent are combined.
Pattern 6 (corresponding to the fifth arrangement pattern described above)
The surface substrate was applied in a wave shape by flexographic printing using an anilox roll having a line number of 600 and a groove volume of 5.5 cc on the line. The halftone dot in the halftone dot region was 60%. The thickness of the surface base material after coating and the release agent is 71 μm.

[Measuring method]
<Layer thickness>
Measured based on JIS P 8118.
<Measurement of peel strength of surface substrate>
A specimen having a width of 50 mm and a length of 250 mm was prepared from the specimen after being stored at room temperature (temperature: 23 ° C., humidity: 50%) for 14 days and subjected to peel force measurement. In the peel force measurement, the intermediate substrate on which the adhesive layer was formed was fixed, and the force when the surface substrate on which the release agent layer was formed was pulled under the following conditions using a tensile tester was measured.
Peel angle 180 °
Peeling speed: 300mm / min
In addition, the measured value is represented by the unit width conversion value (g / 50mm) of a test piece. Moreover, the peeling force of the obtained test piece was represented by an index based on Comparative Example 1. The calculation method is as follows.
Peeling force index = {(Measured peeling force of test piece) / (Peeling force of reference test piece)} × 100

<Curl measurement>
The curl is a value indicating how to bend (curl) after the surface substrate 11 is peeled off, and was measured by the following method. That is, in the above-described peeling force measurement, the height to both ends with respect to the bottom of the curved surface base material after peeling was measured (unit: mm).
The obtained value was expressed by an index based on Comparative Example 1. The calculation method is as follows.
Curl value index = {(Measured test piece curl (mm)) / (Reference test piece curl (mm))} × 100

[Examples and Comparative Examples]
<Example 1>
The surface of the thermal paper was coated with a release varnish to obtain a first layer material having a pattern 1 release agent layer formed thereon. Further, a hot melt adhesive was applied to a predetermined region on the surface of the fine paper to obtain a second layer material. Subsequently, the first layer material and the second layer material were pressure-bonded using a hot melt adhesive under a heating temperature of 180 ° C. to obtain an adhesive sheet.

  A strong adhesive was applied as an adhesive layer to the surface of the adhesive sheet on the second layer material side, a release sheet as a third layer material was disposed, and a laminate specimen was obtained.

<Example 2>
A laminate was produced in the same manner as in Example 1 except that the pattern 2 was used as the arrangement pattern of the release agent layer.

<Example 3>
A laminate was produced in the same manner as in Example 1 except that the pattern 3 was used as the arrangement pattern of the release agent layer.

<Example 4>
A laminate was produced in the same manner as in Example 1 except that the pattern 4 was used as the arrangement pattern of the release agent layer.

<Example 5>
A laminate was prepared in the same manner as in Example 1 except that the pattern 6 was used as the arrangement pattern of the release agent layer.

<Comparative Example 1>
A laminate was produced in the same manner as in Example 1 except that the pattern 5 was used as the arrangement pattern of the release agent layer.

<Comparative example 2>
A laminate was prepared in the same manner as in Example 1 except that the release agent layer was pattern 1 (solid coating) and a water-based emulsion adhesive was applied as a pseudo-adhesive adhesive in a dot pattern.

<Comparative Example 3>
A laminate was prepared in the same manner as in Example 1 except that the release agent layer was pattern 1 (solid coating) and a water-based emulsion adhesive was applied as a pseudo-adhesive adhesive in a dot pattern.

［結果］
第１表に示すように、積層体１において、剥離剤層１２を形成する剥離剤の配置パターンが、単位面積当たり６０％以上の網点になっていると、接着剤層の方をパターン形成する従来品と遜色の無い程度の剥離力が得られる。

[result]
As shown in Table 1, in the laminate 1, when the arrangement pattern of the release agent forming the release agent layer 12 is a dot of 60% or more per unit area, the adhesive layer is patterned. The peel strength is comparable to conventional products.

  The specimens of Comparative Examples 2 and 3, which are conventional products, are obtained by applying a water-based emulsion adhesive in a pattern, but the surface substrate after peeling becomes too severe to become a cylindrical shape, resulting in curling. It could not be measured.

  On the other hand, when the arrangement pattern of the release agent forming the release agent layer 12 in the laminate 1 is a dot of 60% or more per unit area, a hot melt adhesive is used as an adhesive for pseudo-adhesion. Even when it is used, the peeling force can be suppressed and curling can be suppressed. Moreover, if the halftone dot of the release agent layer 12 is 80% or more, the effect of suppressing the peeling force is enhanced.

  Moreover, it turns out that the effect which suppresses peeling force is heightened by making a peeling varnish into a waveform as shown in the 5th arrangement pattern like the pattern 6. FIG. That is, an effect of suppressing the curling of the surface base material 11 is obtained.

DESCRIPTION OF SYMBOLS 1 Laminate 10 Adhesive sheet 11 Surface base material 11R Surface base material roll 11M Mark 12 Release agent layer 12D Halftone dot area 12S Solid coating area 13 Adhesive layer 14 Intermediate base material 14R Intermediate base material roll 15 Adhesive layer 16 Release sheet 100 Adhesive sheet manufacturing apparatus 101 Supply shaft 102 Supply shaft 103 Printing unit 104 Coater 105, 106 Crimp roll 111, 112, 113, 114, 115 Conveying roller

Claims (11)

An adhesive sheet having a surface substrate and an intermediate substrate,
The surface substrate;
A release agent layer;
An adhesive layer;
The intermediate base material is provided in this order,
The adhesive sheet in which the release agent layer is scattered and arranged on the surface base material. The adhesive sheet according to claim 1,
The release agent layer is an adhesive sheet having a halftone dot region in which release agents are arranged in a halftone dot pattern on the surface base material. The adhesive sheet according to claim 1,
The release agent layer is an adhesive sheet having a halftone dot region in which a release agent is arranged in a dot pattern on the surface base material and a solid coating region in which the release agent is arranged in a predetermined region. The adhesive sheet according to claim 3,
The adhesive sheet in which the halftone dot region and the solid coating region are respectively formed along a peeling direction from a peeling start end to a peeling end end of the surface base material. The adhesive sheet according to claim 4,
The release agent layer is an adhesive sheet in which the halftone dot region and the solid coating region are alternately formed in a direction intersecting the peeling direction. The adhesive sheet according to claim 5,
An adhesive sheet in which at least one of the halftone dot region and the solid coating region is formed in a wave shape. The adhesive sheet according to any one of claims 4 to 6,
The adhesive sheet in which the dot areas and the solid areas are alternately formed in the peeling direction. The adhesive sheet according to any one of claims 3 to 7,
In the halftone dot region, an adhesive sheet in which a ratio of a region where the release agent is disposed is 60% or more per unit area. The adhesive sheet according to any one of claims 1 to 8,
An adhesive sheet in which the surface substrate is thermal paper. A laminate having a surface substrate and an intermediate substrate,
The surface substrate;
A release agent layer;
An adhesive layer;
The intermediate substrate;
An adhesive layer;
With release sheet in this order,
A laminate in which the release agent layers are scattered in the surface base material. A method for producing an adhesive sheet in which substrates are detachably bonded to each other,
Manufacture of an adhesive sheet comprising a step of pressing a release agent layer side surface of a surface substrate on which a release agent layer is formed and an intermediate substrate surface on which an adhesive layer is formed facing each other Method.

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