JP6018960B2 - LAMINATED SHEET AND METHOD FOR PRODUCING LAMINATED MOLDING USING THE SAME - Google Patents

Description

  The present invention relates to a laminated sheet and a method for producing a laminated molded article using the laminated sheet.

  The surface decorating method for three-dimensional adherends has been attracting attention in recent years for the purpose of increasing the added value of a molded product and imparting a high-class feeling, but since the surface has many complicated three-dimensional shapes, the adherend After patterning on top, this pattern layer is protected and painted. However, such a method requires man-hours and time for the work process, and increases costs.

  For this reason, a method of directly adhering a decorative film to a three-dimensional adherend is desired as a method capable of decorating the surface at a low cost with fewer work steps. As such a method, for example, in Patent Document 1, an acrylic resin sheet and a patterned vinyl chloride resin sheet are laminated while applying an adhesive or a solvent, and the resultant composite sheet is heated (annealing). The composite sheet that has been treated and heated (annealed) is heat-softened, and the heat-softened composite sheet is vacuum-sucked onto a plastic adherend to form the composite sheet on the adherend and simultaneously bond After that, a method for decorating the surface of a plastic adherend that cuts off an excess portion of the composite sheet that protrudes onto the adherend has been reported. According to this method, it is possible to achieve a clear and deep finish by providing a thick acrylic resin sheet layer on the surface of an inexpensive vinyl chloride resin sheet with a pattern, and there is no troublesome painting process in all processes. It is possible to obtain a plastic adherend having a decorated surface with a high degree of clarity and is not limited by the shape and material of the plastic adherend to be decorated.

  By the way, Patent Document 2 discloses a laminated sheet for molding in which at least two synthetic resin films for molding are laminated via a decorative layer having a metallic luster. And it discloses that an adhesive may be interposed at the interface between the decorative layer and the synthetic resin film for molding. Furthermore, an example is also disclosed in which a forming process is performed on a test mold by a vacuum forming method using the obtained forming laminated sheet.

JP-A-7-156275 JP 2003-136636 A

  Here, according to the study by the present inventors, a vacuum forming method using a laminated sheet in which a plurality of resin layers as disclosed in Patent Literature 1 and Patent Literature 2 are laminated via an adhesive layer. It has been found that when a concavo-convex adherend is molded by the above process to produce a laminated molded product, bubbles may be generated in the laminated sheet attached to the surface of the adherend. Thus, if bubbles are mixed in the laminated sheet, the appearance of the molded product is remarkably impaired. Therefore, preventing the generation of such bubbles is an extremely important control factor in the production of the laminated molded product.

  Accordingly, the present invention has been made in view of the above circumstances, and a forming process is performed on an adherend by a vacuum forming method or the like using a laminated sheet in which a plurality of resin layers are laminated via an adhesive layer. In this case, an object is to provide means capable of preventing the generation of bubbles in the laminated sheet.

  The present inventors have intensively studied to solve the above problems. As a result, in a laminated sheet in which a plurality of resin layers are laminated via an adhesive layer, an opening is provided that opens on at least one main surface side of the laminated sheet so as to communicate with the adhesive layer; and It has been found that the above problem can be solved by controlling the air resistance of the laminated sheet to a predetermined value or less, and the present invention has been completed.

That is, in one embodiment of the present invention, a stack including a first resin layer, a second resin layer, and a first adhesive layer interposed between the first resin layer and the second resin layer is provided. Regarding the sheet. And the laminated sheet is:
(1) An opening hole is provided to open on at least one main surface side of the laminated sheet so as to communicate with the first adhesive layer; and
(2) The air resistance at 23 ° C. and 50% RH is 10 seconds or more.
It has these two characteristics.

  Moreover, according to the other form of this invention, the manufacturing method of the lamination molded product using the lamination sheet which concerns on the said form is provided. In the manufacturing method, the laminated sheet according to the above embodiment is coated by vacuum forming, pressure forming, or vacuum / pressure forming so that the second resin layer side is disposed on the adherend side with respect to the first resin layer. It has a laminating process of laminating on the surface of the body.

  According to the present invention, even when a forming process is performed on an adherend by a vacuum forming method or the like using a laminated sheet in which a plurality of resin layers are laminated via an adhesive layer, The generation of bubbles can be effectively prevented.

It is sectional drawing of the lamination sheet which concerns on one Embodiment of this invention. It is a top view of the lamination sheet which concerns on one Embodiment of this invention. It is an enlarged plan view of the lamination sheet which concerns on one Embodiment of this invention. It is the schematic explaining the lamination process (1) which concerns on this invention. It is the schematic explaining the lamination process (1) which concerns on this invention. It is the schematic explaining the lamination process (1) which concerns on this invention. It is the schematic explaining the lamination process (1) which concerns on this invention. It is the schematic explaining the lamination process (1) which concerns on this invention.

According to one aspect of the present invention, a laminate including a first resin layer, a second resin layer, and a first adhesive layer interposed between the first resin layer and the second resin layer. A sheet is provided. And the laminated sheet is:
(1) An opening hole is provided to open on at least one main surface side of the laminated sheet so as to communicate with the first adhesive layer; and
(2) The air resistance at 23 ° C. and 50% RH is 10 seconds or more.
It has these two characteristics.

  Hereinafter, although the laminated sheet which concerns on the said form is demonstrated in detail, referring drawings, the technical scope of this invention is not necessarily limited only to the following form.

  FIG. 1 is a cross-sectional view of a laminated sheet according to an embodiment of the present invention. As shown in FIG. 1, the laminated sheet 1 according to this embodiment includes a first resin layer 2 and a second resin layer 3 made of, for example, polyolefin, the first resin layer 2 and the second resin. And a first adhesive layer 4 interposed between the layer 3 and the first adhesive layer 4. The first adhesive layer 4 contains an adhesive, whereby the first resin layer 2 and the second resin layer 3 are bonded to each other. Furthermore, a second adhesive layer 6 is provided on the surface of the second resin layer 3 on the side facing the first adhesive layer 4.

  And as a 1st characteristic, in the lamination sheet 1 which concerns on this embodiment, it opens to the exposed main surface side of the 1st resin layer 2 of the lamination sheet 1 so that it may connect with the 1st adhesive bond layer 4. FIG. An opening hole 5 is provided. On the other hand, the main surface where the second adhesive layer 6 is exposed through the second resin layer 3 and the second adhesive layer 6 of the laminated sheet 1 so as to communicate with the first adhesive layer 4. An opening hole 5 that opens to the side is provided.

  In the embodiment shown in FIG. 1, a large number of opening holes 5 are provided on each of the first resin layer 2 side and the second resin layer 3 and second adhesive layer 6 sides. As a result, the exposed main surface side of the first resin layer 2 and the first adhesive layer 4 communicate with each other through the opening hole 5 penetrating the first resin layer 2, while the second resin layer 3 The exposed main surface side of the second adhesive layer 6 and the first adhesive layer 4 are communicated with each other through the opening hole 5 penetrating the second adhesive layer 6.

  FIG. 2 is a plan view of a laminated sheet according to an embodiment of the present invention (the embodiment shown in FIG. 1), and is a plan view seen from the exposed main surface side of the first resin layer 2 in FIG. . As shown in FIG. 2, in the laminated sheet 1 according to the present embodiment, the opening holes 5 that open to the exposed main surface side of the first resin layer 2 are regularly and periodically arranged.

  Hereinafter, each component which comprises the lamination sheet of this invention is demonstrated in detail.

[Resin layer]
The resin layer (the first resin layer 2 and the second resin layer 3) is a main component in the laminated sheet 1 and can be made of various materials depending on the application for which the laminated sheet 1 is used. In consideration of the case where it is applied to the surface of an uneven adherend as described later by a vacuum forming method or the like, the material constituting the first resin layer 2 and the second resin layer 3 is the three-dimensional of the uneven adherend. It is preferable that the film can be stretched so as to follow the shape. Although there is no restriction | limiting in particular as a specific material, For example, polyester, such as polyolefin, such as polyethylene, a polypropylene, polybutene, polybutadiene, an acrylic resin, a vinyl chloride resin, a polyurethane resin, a polyethylene terephthalate, a polybutylene terephthalate, a polyethylene naphthalate, ethylene- A methacrylic acid copolymer etc. are mentioned. Of these, polyethylene, polypropylene, acrylic resin, vinyl chloride resin, and polyurethane resin are preferable in consideration of stretchability (three-dimensional shape followability). From the viewpoint of ease of vacuum forming, pressure forming, or vacuum / pressure forming, the constituent material of the first resin layer 2 and the second resin layer 3 is preferably an unstretched film. Here, the said material may be used independently or may be used with the form of a 2 or more types of mixture. Moreover, the 1st resin layer 2 and the 2nd resin layer 3 may each be comprised from a single resin layer, and may be formed by laminating | stacking a different kind of resin layer. Furthermore, the constituent material of the first resin layer 2 and the constituent material of the second resin layer 3 may be the same or different.

  The thicknesses of the first resin layer 2 and the second resin layer 3 are not particularly limited, but are preferably 10 to 300 μm and preferably 25 to 150 μm in view of stretchability (three-dimensional shape followability). More preferred. With such a thickness, vacuum forming, pressure forming, or vacuum / pressure forming can be easily performed, and even by the forming, the resin layer can sufficiently exhibit the three-dimensional shape followability to the uneven adherend. .

  As a typical example of laminating the first resin layer 2 and the second resin layer 3 via the first adhesive layer 4, the second resin layer 3 is a decorative layer, and the first resin layer The case where 2 is a transparent protective layer is mentioned. In this case, it is preferable that the first resin layer 2 has high transparency from the viewpoint of ensuring visibility. Specifically, the visible light transmittance of the first resin layer 2 is preferably 80% or more, more preferably 90% or more.

[Adhesive layer]
The first adhesive layer 4 is not particularly limited as long as it can adhere the first resin layer 2 and the second resin layer 3. The second adhesive layer 6 is not limited as long as it can adhere to the uneven adherend. In the present invention, the adhesive includes a pressure sensitive adhesive.

  Specific examples of the adhesive include acrylic adhesives, silicone adhesives, rubber adhesives, vinyl ether adhesives, and the like. These adhesives may be either solvent type or emulsion type. Among these, acrylic adhesives include n-butyl (meth) acrylate, hexyl (meth) acrylate, 2-diethylbutyl (meth) acrylate, isooctyl (meth) acrylate, (meth) acrylic acid 2 -1 type, or 2 or more types of (meth) acrylic acid esters, such as methoxyethyl, 2-ethylhexyl (meth) acrylate, decyl (meth) acrylate, dodecyl (meth) acrylate, tridecyl (meth) acrylate, (Meth) acrylic acid, itaconic acid, maleic acid, maleic anhydride, hydroxyethyl acrylate, hydroxypropyl acrylate, acrylamide, dimethylacrylamide, methylaminoethyl methacrylate, ( Functional monomers such as methoxyethyl acrylate Mentioned copolymer, etc. are. Specific examples of the silicone-based adhesive include those composed of a mixture and / or polymer of dimethylsiloxane gum and dimethylsiloxane resin. Specific examples of the rubber-based adhesive include synthetic rubbers such as styrene-isoprene-styrene block copolymer rubber, styrene-butadiene rubber, polybutene rubber, butyl rubber, and natural rubber as main components. Specific examples of the vinyl ether adhesive include ethyl vinyl ether, propyl vinyl ether, butyl vinyl ether, 2-ethylhexyl vinyl ether and the like.

  These adhesives need to be a thin and uniform layer, and are formed by diluting with water or an organic solvent, coating and drying.

  As will be described later, the operational effects achieved by the configuration of the present invention are as follows. The laminated sheet is formed by laminating a plurality of resin layers with an adhesive layer interposed therebetween. Even when the molding process is performed, the generation of bubbles in the laminated sheet can be effectively prevented. Here, the mechanism by which such an effect is exhibited by the present invention is not completely clear, but by providing the opening hole 5 as shown in FIG. Even when a volatile component such as a solvent contained in a small amount in the adhesive layer volatilizes when the sheet is heated, the opening hole 5 on the side where the opening hole 5 communicates from the opening hole 5 provided in the laminated sheet 1. It is considered that the volatile component can escape from the main surface side of the laminated sheet 1.

  In the prior art, since such an opening hole was not formed, the residual solvent whose volume was expanded by heating under low pressure pushed up the softened resin layer, and bubbles were generated. Conceivable.

  In consideration of such effects of the present invention, the first adhesive layer is formed by applying and drying an adhesive dispersed in water or dissolved in an organic solvent, and inevitably water or an organic solvent. The effect of the present invention is exhibited in the case where the residue remains.

[Opening hole]
The opening hole 5 includes an adhesive located between the first adhesive layer 4 (that is, the two resin layers (the first resin layer 2 and the second resin layer 3 in the embodiment shown in FIG. 1)). It is a hole that opens to at least one main surface side of the laminated sheet 1 so as to communicate with the layer.

  As long as the above definition is satisfied, the specific shape of the opening hole 5 is not particularly limited.

  FIG. 3 is an enlarged plan view in which the plan view of the laminated sheet according to the embodiment of the present invention shown in FIG. 2 is enlarged. As shown in FIGS. 2 and 3, the opening holes 5 are preferably provided regularly and periodically. According to such a form, productivity at the time of mass production can be remarkably improved. Although there is no restriction | limiting in particular also about the size and arrangement | positioning form of the opening hole 5, As an example, the opening diameter (diameter; "D" shown in FIG. 3) of the opening hole 5 becomes like this. Preferably it is 1-200 micrometers, More preferably, 5 It is -100 micrometers, More preferably, it is 10-50 micrometers. When the opening diameter (diameter D) of the opening hole 5 is a value within such a range, there is an advantage that the opening hole cannot be recognized with the naked eye. The opening diameter (diameter D) of the opening hole 5 is defined as the maximum of the distances between any two points on the contour line of the opening hole 5. When the diameters of the respective opening holes 5 are not the same, the opening diameter (diameter D) is calculated as an average value of the opening diameters (diameter D) of several tens of opening holes 5.

  The distance between the centers of the opening holes 5 (pitch; “P” shown in FIG. 3) is preferably 100 to 100,000 μm, more preferably 500 to 80,000 μm, and still more preferably 1,000. ˜50,000 μm. When the distance (pitch P) between the centers of the opening holes 5 is within such a range, there is an advantage that the gas volatilized from the adhesive layer can be efficiently released to the outside of the laminated sheet. If the distance between the centers of the apertures 5 (pitch P) is not the same due to the combination of two adjacent apertures 5, the distance between the centers of the apertures 5 (pitch P) is several tens. It is assumed that the average value of the distance (pitch P) between the centers of the pair of opening holes 5 is calculated.

  Examples of the method for forming the opening hole include laser, hot needle, press, drill, or electric discharge.

  If the opening hole 5 communicates with the first adhesive layer 4 from the surface of the first resin layer 2 or the second resin layer 3, the gas volatilized from the first adhesive 4 is Although it can escape to the exterior of the lamination sheet 1, it is preferable not to penetrate from the surface of 1st resin to the surface of 2nd resin. This is because if the sheet penetrates, the laminated sheet 1 cannot be pressure-bonded to the uneven adherend 12 by vacuum / pressure forming as will be described later.

  When forming the opening hole, the hole may inevitably penetrate, but when the air resistance described below is smaller than a certain value, the effect of the present invention can be exhibited. .

[Air permeability resistance]
As another feature, the laminated sheet 1 according to the present invention has a feature that the air resistance at 23 ° C. and 50% RH is 10 seconds or more. In order to pressure-bond the laminated sheet 1 to the surface of the uneven adherend 12 by a vacuum / pressure forming method or the like, a pressure difference needs to be generated between the two spaces partitioned by the laminated sheet 1 due to the mechanism. Therefore, since the air permeates through the laminated sheet 1 and the pressure difference is eliminated, the molding cannot be achieved. Therefore, the laminated sheet 1 can withstand the pressure difference generated during molding by a vacuum molding method or the like. The air resistance mentioned above is defined as a parameter for defining the existence. That is, the laminated sheet 1 having an air resistance of less than 10 seconds is not suitable for forming by a vacuum forming method or the like.

  In this specification, the value measured by the Gurley method (JIS P8117: 2009 or ISO5636-5: 2003) is adopted as the value of “air permeability resistance”. The air permeation resistance represents the time (seconds) required for air with a volume of 100 mL to pass through the test piece, and the larger the value, the more difficult the air passes through.

  If the air resistance of the laminated sheet 1 is 10 seconds or more, the pressure difference can be maintained and the laminated sheet can be pressure-bonded to the surface of the uneven adherend, but from the viewpoint of workability, preferably 100 seconds or more. More preferably, it is 1,000 seconds or more. When the opening hole does not penetrate from one main surface to the other main surface, it is substantially 10,000 seconds or more. In addition, there is no restriction | limiting in particular about the upper limit of air permeability resistance.

[Peeling sheet]
Although not shown, a release sheet may be further disposed on the exposed main surface side of the second adhesive layer 6. This release sheet prevents unintended adhesion, and is peeled off when laminated.

  The specific form of the release sheet is not particularly limited, and conventionally known knowledge can be referred to as appropriate. Release sheets are generally based on materials such as polyester films such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, plastic films such as polyolefin films such as polypropylene and polyethylene; papers such as glassine paper, kraft paper and clay coated paper. Configured as a material. The thickness of these base materials is usually about 10 to 400 μm. Further, a layer (not shown) made of a release agent composed of silicone or the like for improving the release property of the second adhesive layer 6 may be provided on the surface of the release sheet. When such a layer is provided, the thickness of the layer is usually about 0.01 to 5 μm.

[Production method of laminated sheet]
There is no restriction | limiting in particular about the manufacturing method of the laminated sheet 1, A conventionally well-known knowledge can be referred suitably. For example, after laminating the first adhesive layer 4, the second resin layer 3, and the second adhesive layer 6 in this order on the resin film that forms the first resin layer 2, the first resin layer An opening hole communicating with the first adhesive layer 4 from the surface is formed on the surface of the first resin layer.

[Manufacturing method of laminated molded product]
According to the other form of this invention, the manufacturing method of the lamination molded product using the lamination sheet 1 which concerns on the form mentioned above is also provided. In the present specification, the “laminated molded product” means that the laminated sheet 1 having the above-described form is formed on the surface of the adherend with the second resin layer 3 or the second adhesive layer 6 and the adherend. It means a molded product that is affixed to touch.

  The manufacturing method of the laminated molded product according to the present embodiment is such that the second resin layer side is arranged on the adherend side with respect to the first resin layer by vacuum forming, pressure forming or vacuum / pressure forming. It has a lamination process which laminates the lamination sheet concerning a form on the surface of an adherend.

  There is no restriction | limiting in particular about the specific structure of a to-be-adhered body, What is necessary is just the articles | goods etc. which can affix the said lamination sheet in the lamination process mentioned later. In addition, in the manufacturing method of the laminated molded product which concerns on this invention, there exists an advantage that a laminated sheet can be reliably affixed also to the to-be-adhered body which has the unevenness | corrugation with complicated shape. Therefore, the adherend in the production method according to the present invention is preferably one having such unevenness (also referred to as “unevenness adherend”). Hereinafter, although the case where an adherend is uneven | corrugated is mentioned as an example and the detail of the manufacturing method which concerns on this invention is demonstrated, the technical scope of this invention is not necessarily limited only to such a form.

[Lamination molding process]
In the lamination molding process, the laminated sheet 1 having the above-described form is formed on the concavo-convex adherend by vacuum forming, pressure forming, or vacuum / pressure forming so that the second adhesive layer 6 is disposed on the concavo-convex adherend side. Laminate on the surface. In this specification, “vacuum forming” means that a laminated sheet is softened by heating or the like, placed on an uneven adherend, and a space between the laminated sheet and the uneven adherend is evacuated to form a laminate. It refers to a method of forming a sheet by adsorbing it to an uneven adherend. Examples of vacuum forming include, but are not limited to, straight methods, drape methods, plug assist methods, air slip methods, snapback methods, reverse draw methods, plug assist / reverse draw methods, air cushion methods, and the like. “Pneumatic forming” means that the laminated sheet is softened by heating or the like, placed on the rugged adherend, and the gas flows from the laminated sheet side toward the rugged adherend. It refers to a method in which the space on the side where no body is present is pressed and the laminated sheet is pressure-bonded to the uneven adherend and molded. “Vacuum / pressure forming” is a method that combines the above vacuum forming and pressure forming. The laminated sheet is softened by heating or the like and placed on the concavo-convex adherend. The space of the laminated sheet is evacuated and a gas is flowed from the laminated sheet side toward the concavo-convex adherend to pressurize the space above the laminated sheet (the side without the concavo-convex adherend of the laminated sheet) to It refers to the method of forming by adsorbing and pressing onto the adherend.

  As described above, vacuum forming, pressure forming, or vacuum / pressure forming is performed by heating and softening the laminated sheet on the surface of the target concavo-convex adherend, and reducing the space on the side where the laminated sheet is bonded (vacuum) Molding) or pressurizing the space on the opposite side (pressure forming) or combining them (vacuum / pressure forming) to form a laminated sheet along the three-dimensional solid shape of the concavo-convex adherend surface. Is possible. Therefore, according to the production method of the present invention, the laminated sheet can be brought into close contact with the entire surface of the uneven adherend by following the desired three-dimensional shape of the uneven adherend. In addition, since the manufacturing method of the present invention is excellent in the three-dimensional conformability of the target concavo-convex adherend, it is possible to apply the concavo-convex sheet to a fine structure without causing local ductility in the laminated sheet. It is possible to laminate (stick) closely corresponding to the shape of the body. In addition, since vacuum forming, pressure forming, and vacuum / pressure forming according to the present invention are performed under a reduced pressure or under a high pressure and in a short time, the mixing (sticking) process is performed, so that mixing of bubbles at the time of stacking (sticking) is suppressed.・ Can be prevented.

  Hereinafter, with reference to FIG. 4A to FIG. 4E, the lamination molding process according to the present invention by vacuum / pressure forming will be described. In addition, when performing shaping | molding by vacuum forming or pressure forming, it can carry out similarly to the following method except omitting pressurization or vacuum.

  4A to 4E are schematic views for explaining a lamination molding process according to the present invention. First, the laminated sheet 1 and the uneven adherend 12 are installed in the vacuum / pressure forming machine 10 (FIG. 4A). Here, the vacuum / pressure forming machine 10 includes a container 14 in which a table 15 is disposed and a lid 16. The laminated sheet 1 is arranged so as to partition the space inside the container 14 and the lid 16, and at this time, the second adhesive layer 6 is arranged on the uneven adherend 12 side. The uneven adherend 12 is installed in the table 15. Next, the laminated sheet 1 is heated by the heater 13 to be softened, and the air in the container 14 and the lid 16 is extracted to reduce the pressure in the apparatus (FIG. 4B). Here, the heating condition is not particularly limited as long as it can soften the laminated sheet 1 to such an extent that it can sufficiently follow the shape of the uneven adherend 12 during vacuum and / or pressure forming, and the first resin layer 2 and It is appropriately selected depending on the material of the second resin layer 3 and the like. Specifically, the heating temperature is preferably 70 to 150 ° C, and more preferably 80 to 130 ° C. Further, the heating time is preferably 10 to 300 seconds, and more preferably 20 to 180 seconds. Next, the table 15 is lifted to the laminated sheet 1 side (FIG. 4C). Next, air is introduced into the lid 16 so that the space in the lid 16 is pressurized, and a pressure difference is generated between the space in the lid 16 and the space in the container 14. Due to this pressure difference, the laminated sheet 1 is pressure-bonded along the shape of the uneven adherend 12 (FIG. 4D).

  Next, the lid 16 is lifted, and the pressure in the vacuum / pressure forming machine 10 is returned to the atmospheric pressure (FIG. 4E). By this operation, the laminated sheet 1 follows the shape of the uneven adherend 12 and is laminated (adhered) to the surface of the uneven adherend 12 via the second adhesive layer 6. Next, the excess laminated sheet 1 portion that protrudes outside the uneven adherend 12 is cut out (trimming process) using an appropriate cutting means such as a thermo cutter or a cutter, and the laminated sheet 1 is adhered onto the uneven adherend 12. A laminated molded product is obtained.

  In the manufacturing method according to the present invention, a laminated molded product is produced using the laminated sheet described above, and therefore the volatile component in the first adhesive layer 4 that has volatilized and expanded during heating such as vacuum forming is a laminated sheet. You can get out of 1. Accordingly, the generation of bubbles in the first adhesive layer 4 is prevented, and as a result, the obtained laminated molded product has an extremely excellent appearance.

  The effects of the present invention will be described using the following examples and comparative examples. However, the technical scope of the present invention is not limited only to the following examples.

Example 1
As an adhesive solution, an isocyanate-based crosslinking agent (100 parts by mass of an acrylic ester copolymer solution having a functional group (manufactured by Nippon Synthetic Chemical Industry Co., Ltd., Coponil N-2147, solid content: 35% by mass)) is used. Nippon Polyurethane Industry Co., Ltd., Coronate L, solid content 75% by mass) 1 part by mass, and 25 parts by mass of ethyl acetate as a diluent solvent were blended.

  A first adhesive layer having a thickness of 20 μm is formed by applying the solution on one surface of a transparent acrylic film having a thickness of 100 μm that forms the first resin layer and drying at 90 ° C. for 1 minute. did.

  A vinyl chloride film having a thickness of 100 μm for forming the second resin layer is bonded to the first adhesive layer produced as described above, and the first adhesion described above is further formed on the exposed surface of the vinyl chloride film. A second adhesive layer having the same composition as the agent layer and a thickness of 20 μm was formed.

  Using a carbon dioxide laser irradiator, an opening hole (diameter 30 to 300 μm, pitch 5 mm; penetrates the acrylic film and communicates with the first adhesive layer but does not penetrate the vinyl chloride film) on the exposed surface of the acrylic film. Thus, a laminated sheet according to Example 1 was produced.

  With respect to the laminated sheet thus prepared, the air resistance at 23 ° C. and 50% RH was measured by the Gurley method (JIS P8117: 2009 or ISO5636-5: 2003), and it was 50 seconds.

  In addition, even when the pressure inside the container and lid of the vacuum / pressure forming machine was reduced to 0.1 kPa and the laminated sheet was heated to 120 ° C. to be softened, no bubbles were generated inside the laminated sheet.

Example 2
In Example 1, by further irradiating the laser from the exposed surface of the second adhesive layer, the exposed surface of the second adhesive layer penetrates the opening hole (through the second adhesive layer and the vinyl chloride film, A layered sheet according to Example 2 was prepared by communicating with the first adhesive layer but not opening on the exposed surface of the acrylic film.

  With respect to the laminated sheet thus produced, the air resistance was measured in the same manner as described above, and it was 40 seconds.

  Further, no bubbles were generated even when heated under reduced pressure in the same manner as described above.

Comparative Example 1
A laminated sheet according to Comparative Example 1 was produced in the same manner as in Example 1, except that no opening hole was formed on the exposed surface of the acrylic film.

  When the laminated sheet thus obtained was heated under reduced pressure in the same manner as described above, bubbles were generated inside the laminated sheet.

Comparative Example 2
In Example 1, by increasing the output of the carbon dioxide gas laser, the exposed surface of the acrylic film penetrates through the aperture holes (the acrylic film, the first adhesive layer and the vinyl chloride film, and the exposed surface of the second adhesive layer). A laminated sheet according to Comparative Example 2 was produced in the same manner except that (opened) was formed.

  With respect to the laminated sheet thus produced, the air resistance was measured in the same manner as described above, and it was 5 seconds.

  In addition, even if the inside of the container and lid of the vacuum / pressure forming machine was depressurized to 0.1 kPa and heated to 120 ° C., no bubbles were generated in the laminated sheet, but even if the inside of the lid was pressurized, Since the internal air permeates the laminated sheet, no pressure is applied to the laminated sheet, and the laminated sheet cannot be bonded to the surface of the adherend.

1 Laminated sheet,
2 1st resin layer,
3 Second resin layer,
4 first adhesive layer,
5 opening holes,
6 second adhesive layer,
10 Vacuum / pressure forming machine,
12 Concavity and convexity adherend,
13 Heater,
14 containers,
15 tables,
16 lid,
D Opening diameter (diameter) of the opening hole,
P Distance (pitch) between the centers of the opening holes.

Claims (8)

A first resin layer;
A second resin layer;
A first adhesive layer interposed between the first resin layer and the second resin layer and containing a pressure-sensitive adhesive or pressure-sensitive adhesive ;
Only including,
An opening hole is provided to open on at least one main surface side of the laminated sheet so as to communicate with the first adhesive layer,
Air resistance at 23 ° C. 50% RH is Ru der least 10 seconds, a laminated sheet,
A laminated sheet is laminated on the surface of the adherend by vacuum forming, pressure forming, or vacuum / pressure forming so that the second resin layer side is disposed on the adherend side with respect to the first resin layer. A laminated sheet used in a method for producing a laminated molded article having a step of forming .   The laminated sheet according to claim 1, wherein the opening hole does not include a communication hole that opens so as to communicate with both main surface sides of the laminated sheet.   The said opening hole is provided regularly and periodically in the at least one main surface of a lamination sheet, and the opening diameter (diameter) of the said opening hole is 1-200 micrometers. Laminated sheet.   The opening holes are regularly and periodically provided on at least one main surface of the laminated sheet, and the distance (pitch) between the centers of the opening holes is 100 to 100,000 μm. The laminated sheet of any one of -3. The laminated sheet according to any one of claims 1 to 4 , wherein the first adhesive layer has a thickness of 1 to 150 µm. The first resin layer and the second resin layer are each independently one or more materials selected from the group consisting of polyethylene, unstretched polypropylene, acrylic resin, vinyl chloride resin, and polyurethane resin. The laminated sheet according to any one of claims 1 to 5 , which is formed from the following. The laminated sheet according to any one of claims 1 to 6 , wherein a second adhesive layer is provided on a surface of the second resin layer on a side facing the first adhesive layer. . Vacuum forming, by pressure forming or vacuum-pressure forming, so that the side of the second resin layer to the first resin layer is disposed to the adherend side, to any one of claims 1-7 A method for producing a laminated molded article, comprising a step of laminating the laminated sheet described above on the surface of the adherend and molding the laminated sheet.

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