JP2015189132A - Multilayer structured plate, and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer structured plate which is not warped over a long period of time after produced and can be used as a mount for display panels, and to provide a production method of the multilayer structured plate.SOLUTION: The multilayer structured plate 10 includes a polystyrene resin expanded plate 1. A first adhesive layer 22, a first paper layer 23 and a first resin layer 24 are arranged in this order on one surface of the polystyrene resin expanded plate 1. A second adhesive layer 32, a second paper layer 33 and a second resin layer 34 are arranged in this order on the other surface of the polystyrene resin expanded plate 1. The moisture content of the first paper layer 23 and that of the second paper layer 33 are equal to or lower than 10 mass%, respectively and the absolute value of [the moisture content (mass%) of the first paper layer 23]-[that (mass%) of the second paper layer 33] is 1.5 or lower.

Description

  The present invention relates to a laminated structure board obtained by laminating paper on the surface of a foam board via an adhesive and a method for producing the same. The laminated structure board can be used as a display panel mount for displaying a printed material such as a photograph or a poster on its surface.

  Conventionally, high-quality paper is bonded to the surface of a resin foam board via an adhesive as an exhibition mount to attach printed matter such as photographs, posters, advertisements, etc., and further, a moisture barrier layer, an adhesive layer, There is one in which release papers are laminated in order (for example, Patent Document 1). This display board is used by sticking a printed matter or the like to an adhesive layer that appears on the surface by peeling the release paper.

JP 2002-341800 A

  By the way, the display panel mount is required not to warp for a long time after manufacture. However, some of the display panel mounts that are actually on the market may cause a large warp.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the laminated structure board which can be utilized as a mount for display panels which does not generate | occur | produce a curvature over the long period after manufacture, and its manufacturing method.

  The present inventor has intensively studied the factors that cause the warp, and found that the amount of water contained in the paper layer (for example, high-quality paper) adhered to both the front side and the back side of the foamed plate is a factor. Further, when a moisture barrier layer (for example, a resin layer) is laminated on the paper layer, it is less affected by moisture contained in the outside air, but an adhesive for adhering the paper layer to the foam plate. It has also been found that the moisture contained in the ink is absorbed by the paper layer, causing warping. The present invention which has been completed based on these findings has the following configuration.

  The laminated structure board of the present invention includes a polystyrene resin foam board, and a first adhesive layer, a first paper layer, and a first resin layer are arranged in this order on one surface of the polystyrene resin foam board. A second adhesive layer, a second paper layer, and a second resin layer are provided in this order on the other surface of the polystyrene-based resin foam plate, and the first paper layer and the first resin layer are provided in this order. The water content of each of the second paper layers is 10% by mass or less, and [the water content of the first paper layer (% by mass)] − [the water content of the second paper layer (% by mass)]. The absolute value is 1.5 or less.

In the laminated structure board of the present invention, it is preferable that the first adhesive layer and the second adhesive layer have a solid component of 5 to 30 g / m ² .

  In the laminated structure board of the present invention, the first paper layer and the second paper layer preferably have a water immersion elongation of 2% or less.

  In the laminated structure board of the present invention, an adhesive layer and a release paper may be laminated in this order on both or any one of the first resin layer and the second resin layer.

  The method for producing a laminated structural board according to the present invention is a method for producing any one of the above laminated structural boards, wherein the first adhesive layer and the first paper are provided on one surface of the polystyrene resin foam board. Providing a layer and the first resin layer, and providing the second adhesive layer, the second paper layer, and the second resin layer on the other surface of the polystyrene resin foam plate And having.

  In the manufacturing method of the laminated structural board of this invention, it is preferable to provide said 1st adhesive bond layer and 2nd adhesive bond layer using the adhesive agent of 65-85 mass% of solid components.

Since the laminated structure board of the present invention does not warp for a long time after manufacture, the printed matter can be displayed with good appearance by using it as a mount for an exhibition panel, for example.
According to the method for manufacturing a laminated structure board of the present invention, it is possible to produce a laminated structure board that does not warp over a long period after production.

It is a schematic sectional drawing which shows an example of embodiment of this invention. It is a schematic diagram which shows an example of the manufacturing apparatus of a laminated structure board.

《Laminated structure board》
In FIG. 1, the laminated structure board 10 which is an example of embodiment of the laminated structure board of this invention is shown.
The laminated structure board 10 has a laminated structure in which the base paper 20 is bonded to the front surface of the polystyrene resin foam board 1 (hereinafter simply referred to as “foam board 1”), and the backing paper 30 is bonded to the back surface. Have.
Specifically, the laminated structure board 10 is laminated on the foam board 1, the first paper layer 23 bonded to one surface of the foam board 1 via the first adhesive layer 22, and the paper layer 23. The base paper 20 made of the first resin layer 24, the second paper layer 33 bonded to the other surface of the foam board 1 via the second adhesive layer 32, and the paper layer 33 are laminated. And a backing paper 30 made of the second resin layer 34.

<Foam board>
The polystyrene-type resin used for the foamed board 1 which comprises the laminated structure board 10 is not specifically limited, For example, the homopolymer or copolymer of a styrene-type monomer, etc. are mentioned. In addition, as a polystyrene resin, a copolymer having a styrene monomer as a main component, obtained by copolymerizing a styrene monomer and a vinyl monomer copolymerizable with the styrene monomer. May be used.
As the polystyrene-based resin, a polystyrene-based resin having 50% by mass or more of structural units based on styrene with respect to all the structural units is preferable, and polystyrene is more preferable.

Examples of the styrene monomer include styrene, α-methyl styrene, vinyl toluene, chlorostyrene, ethyl styrene, i-propyl styrene, dimethyl styrene, bromostyrene, and the like.
A styrene-type monomer may be used individually by 1 type, and may use 2 or more types together.

Examples of vinyl monomers copolymerizable with styrene monomers include alkyl (meth) acrylates such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, and cetyl (meth) acrylate. Bifunctional monomers such as (meth) acrylonitrile, dimethyl maleate, dimethyl fumarate, diethyl fumarate, ethyl fumarate, divinyl benzene, alkylene glycol dimethacrylate, and the like.
A vinyl-type monomer may be used individually by 1 type, and may use 2 or more types together.

The polystyrene resin used as a raw material can be a commercially available polystyrene resin, a polystyrene resin produced by a method such as suspension polymerization, a polystyrene resin that is not a recycled material (virgin polystyrene), a used foamed plate, Recycled raw materials obtained by reclaiming polystyrene-based resin foam molded articles (such as food packaging trays) can be used. As the recycled material, it is possible to use a recycled material obtained by recovering a used foamed plate or polystyrene-based resin foam-molded product and regenerating it by a limonene dissolution method or a heating volume reduction method.
Polystyrene resins may be used alone or in combination of two or more.

  In the foam board 1, you may mix | blend another resin with a polystyrene resin in the range which has a polystyrene resin as a main component. Here, that the polystyrene resin is the main component means that the ratio of the polystyrene resin to the total resin component (100 mass%) of the foamed plate 1 is 50 mass% or more.

Examples of polystyrene resins blended with other resins include diene rubbery polymers (polybutadiene, styrene-butadiene copolymer, ethylene-propylene-nonconjugated) for improving the impact resistance of the foamed plate 1. Examples thereof include rubber-modified polystyrene resins blended with diene three-dimensional copolymers and the like, so-called high impact polystyrene.
Examples of other resins include polyethylene resins, polypropylene resins, acrylic resins, acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene copolymers, and the like.

Further, as other resins, polyphenylene ether resins may be used. By blending a polyphenylene ether-based resin with a polystyrene-based resin, the foamed plate is superior in toughness, hard to break, excellent in strength, and also excellent in heat resistance, compared to the case where the polystyrene-based resin is used alone.
When blending a polyphenylene ether resin with a polystyrene resin, the ratio of the polyphenylene ether resin is preferably 5% by mass or more and less than 50% by mass, and 10 to 40% by mass with respect to the total resin component (100% by mass). More preferred.
Another resin may be used individually by 1 type, and may use 2 or more types together.

  The foamed plate 1 has a nucleating agent, a crosslinking agent, a filler, a flame retardant, a flame retardant aid, a lubricant (hydrocarbon, fatty acid, fatty acid amide, ester, alcohol, Additives such as metal soaps, silicone oils, waxes such as low molecular weight polyethylene), spreading agents (liquid paraffin, polyethylene glycol, polybutene, etc.), colorants and the like may be added.

Examples of the nucleating agent include talc, sodium hydrogen carbonate, ammonium hydrogen carbonate, calcium carbonate, clay, citric acid and the like. Among these, talc is preferable. A nucleating agent may be used individually by 1 type, and may use 2 or more types together.
The addition amount of the nucleating agent is preferably 0.01 to 5 parts by mass with respect to 100 parts by mass of the polystyrene resin.

The thickness of the foam plate 1 is not particularly limited, and is preferably 3 mm to 20 mm, and more preferably 5 mm to 10 mm from the viewpoint of saving space while maintaining the strength of the foam plate 1.
When it is at least the lower limit of the above range, the strength required of the foamed plate 1 is easily obtained when the laminated structure board 10 is used as a display panel mount. Moreover, there is little possibility that an exhibition space is taken up that it is below the upper limit of the said range.

The expansion ratio of the foam plate 1 is not particularly limited, and is preferably 5 to 25 times, and more preferably 8 to 20 times from the viewpoint of weight reduction while maintaining the strength of the foam plate 1.
The light weight excellent in the foam board 1 can be provided as it is more than the lower limit of the said range.
When it is below the upper limit of the above range, the strength required for the foamed plate 1 is easily obtained when the laminated structure board 10 is used as a display panel mount.

<Adhesive layer>
In the laminated structure board 10, it is preferable that the solid component of the 1st adhesive bond layer 22 which has adhere | attached the 1st paper layer 23 on the one side of the foam board 1 is 5-30 g / m < ² >.

5-30 g / m < ² > is preferable, as for the mass of the 1st adhesive bond layer 22 formed by drying after application | coating of the said solid component, ie, an adhesive, 8-25 g / m < ² > is more preferable, 11-20 g / m ² is more preferable.
Sufficient adhesive strength is obtained by being more than the lower limit of the said range.
By being below the upper limit of the said range, the thickness of the 1st adhesive bond layer 22 can be made thin and it can prevent that a wrinkle and a swelling arise in the 1st paper layer 23. FIG.

  The mass of the first adhesive layer 22 that bonds the base paper 20 and the foamed plate 1 (the mass of the adhesive dried after application) is the sum of the first paper layer 23 and the foamed plate 1 measured in advance. And the difference between the mass after bonding them together. By dividing this difference by the adhesion area, the mass per unit area of the adhesive layer can be calculated. The mass of the second adhesive layer 32 that bonds the backing paper 30 and the foam board 1 is also obtained in the same manner.

  The adhesive that forms the first adhesive layer 22 may be an oil-based adhesive using an organic solvent as a main solvent, or an aqueous adhesive using water as a main solvent. A water-based adhesive is preferred because it has less off-flavors and is easy to apply a thin adhesive using a roll coater or the like.

  Examples of the aqueous adhesive include starch, modified starch, casein, carboxymethylcellulose, hydroxycellulose, soy protein, polyvinyl acetate, ethylene-vinyl acetate-acrylic copolymer, ethylene-vinyl acetate copolymer, acrylic-modified acetic acid. An emulsion-based water-based adhesive such as a vinyl copolymer is applicable. These aqueous adhesives are preferred because they are easy to handle and have good processability.

The adhesive is preferably an adhesive having a solid component content of 65 to 80% by mass relative to the total mass before coating, and the dried solid component after bonding of 5 to 30 g / m ² . The water content of the first paper layer 23 bonded by this suitable adhesive tends to be 10% by mass or less.

65-80 mass% is preferable, as for content of the said solid component which comprises the adhesive agent before application | coating, 65-75 mass% is more preferable, and 68-72 mass% is further more preferable.
By being above the lower limit of the above range, it is possible to prevent moisture from being transferred from the adhesive to the first paper layer 23 and including excessive moisture that may cause warpage in the first paper layer 23. Furthermore, since the drying time after applying the adhesive can be shortened, the manufacturing time can be shortened.
Moreover, the viscosity of an adhesive agent can be reduced to the grade which can apply | coat uniformly by setting it as below the upper limit of the said range.

As described above, the emulsion-based aqueous adhesive is preferably applied at a concentration such that the solid component (nonvolatile content) having adhesiveness is 65 to 80% by mass.
If the amount is less than the lower limit of the above range, the amount of moisture that is the solvent for the adhesive increases, and thus the amount of moisture transferred to the first paper layer 23 to be bonded increases, which may cause warpage of the laminated structure board 10. is there. On the other hand, if the amount is larger than the upper limit of the above range, the viscosity of the adhesive may become too high, and it may be difficult to apply a uniform thin film.

As described above, the coating amount of the emulsion-based aqueous adhesive is preferably 5 to 30 g / m ² as a solid component (nonvolatile content). This range means that the aqueous adhesive is applied in the range of about 7.1 to 42.9 g / m ² when the solid component with respect to the total mass of the aqueous adhesive before application is, for example, 70% by mass. To do.
When it is at least the lower limit of the above range, it can be applied uniformly and the adhesion can be ensured. On the other hand, when the amount is not more than the upper limit of the above range, it is possible to prevent wrinkles in the first paper layer 23, or a long time for drying during production and a decrease in productivity.

  The solid component amount and the volatile component amount of the adhesive can be measured according to JIS K6828-1. Specifically, the amount of the volatile component is obtained by (reduced mass ÷ original mass) × 100 (%) after leaving the adhesive sample at 105 ° C. for 1 hour. Moreover, the amount of solid components is calculated | required by 100-volatile component amount (%).

Up to this point, the first adhesive layer 22 has been described in which the first paper layer 23 is bonded to one surface of the foam plate 1, but the second paper layer 33 is bonded to the other surface of the foam plate 1. The description of the second adhesive layer 32 is omitted because it is the same as the first adhesive layer 22.
The first adhesive layer 22 and the second adhesive layer 32 may be the same or different from each other, but are the same from the viewpoint of suppressing warpage of the laminated structure board 10. preferable.

<Paper layer>
In the laminated structure board 10, the moisture content (water content) of the first paper layer 23 bonded to one surface of the foamed plate 1 and the second paper layer 33 bonded to the other surface of the foamed plate 1 are respectively 10% by mass or less, and the absolute value of the difference represented by [the water content of the first paper layer 23 (% by mass)] − [the water content of the second paper layer 33 (% by mass)] is 1 .5 or less (1.5% or less). By this structure, the curvature of the laminated structure board 10 can be suppressed and a flat form can be maintained over the long term after manufacture.

Here, as a method of measuring the moisture content of the first and second paper layers 23 and 33, a method of measuring using a commercially available moisture measuring device (moisture meter) can be applied. As this moisture measuring device, a commercially available device that measures the moisture content by bringing an electrode into contact with a measurement object and measuring its electrical resistance is applicable. As a specific measurement method, for example, after the laminated structural board 10 to be measured is stored for 24 hours in an atmosphere having a temperature of 23 ° C. ± 2 ° C. and a relative humidity of 60% ± 5%, the measurement is performed in the atmosphere as described above. do it.
The measured moisture content is measured by pressing the electrode of the moisture measuring device against the surface of the paper in the above environment using a moisture meter (MR-200II: manufactured by Sanko Electronics Laboratory Co., Ltd.). Measured value.

  In the laminated structure board 10, the water immersion elongation of the first paper layer 23 constituting the base paper 20 is preferably 2.2% or less. The lower limit of the water immersion elongation is not particularly limited, and may be 0%. When the water immersion elongation is 2.2% or less, even when the moisture of the first adhesive layer 22 is absorbed, the expansion and contraction of the first paper layer 23 is suppressed, and the warpage of the laminated structure board 10 is suppressed. Can be suppressed.

  Here, the measuring method of the water immersion elongation of the first paper layer 23 can be performed by the following method. A test piece composed of a first paper layer 23 having an appropriate size is prepared, and the length L0 before the test piece is immersed in water and the test piece after being immersed in water for a predetermined time (for example, 15 minutes). The length L1 is measured, and the water immersion elongation is measured from the formula [(L1-L0) / L0] × 100 (%).

Specific examples of the first paper layer 23 include, for example, high-quality paper, glassine paper, birchment paper, kraft paper and the like excellent in surface smoothness and printability. A composite paper in which a resin film such as a polyethylene film is sandwiched between these papers may be used as the first paper layer 23. The total basis weight of the first paper layer 23 is preferably 50 to 150 g / m ² from the viewpoint of weight reduction while maintaining its strength.

  As the first paper layer 23 constituting the base paper 20, paper on which a pattern or design corresponding to the use of the laminated structure board 10 is printed may be used.

Up to this point, the first paper layer 23 bonded to one surface of the foam plate 1 has been described. However, the description of the second paper layer 33 bonded to the other surface of the foam plate 1 is not limited to the first paper layer. Since it is the same as that of the layer 23, it is omitted.
The first adhesive layer 22 and the second adhesive layer 32 may be the same or different from each other, but are preferably the same. Since the same paper layer is bonded to both the front and back surfaces of the foam plate 1, the front and back tensions of the foam plate 1 are equalized, and it becomes easy to prevent warping of the laminated structure plate 10.

<Resin layer>
In the laminated structure board 10, a first resin layer 24 is further laminated on the first paper layer 23 bonded to one surface of the foam board 1. Therefore, the base paper 20 constituting the laminated structure board 10 is a composite paper composed of the first paper layer 23 and the first resin layer 24.

The material of the first resin layer 24 is preferably a resin that is impermeable and has a relatively large gas permeability such as butane used as a foaming agent in the production of the foamed plate 1. When the gas permeability of the first resin layer 24 is large, the gas generated from the foaming agent remaining in the foam plate 1 pushes up the first resin layer 24 and causes the surface of the laminated structure plate 10 to swell. Can be prevented.
The first resin layer 24 is preferably a polyolefin resin film, and particularly preferably a polyethylene resin film or a polypropylene resin film.

  Although a metal foil such as aluminum may be used as an alternative material for the first resin layer 24, it should be considered that the metal foil generally has a low gas permeability.

The thickness in particular of the 1st resin layer 24 is not restrict | limited, For example, it can be set as the thickness which will be 1-100 g / m < ² >. Strength of the first resin layer 24, from the viewpoint of balance of impermeable and gas permeable, the range is preferably from 5 to 60 g / ^{m 2,} more preferably 10 to 30 g / ^{m 2,} 15-25 g / m ² is more preferable. More specifically, for example, the thickness can be 10 μm to 100 μm.

  Coloring agents (pigments, dyes, etc.) may be added to the first resin layer 24, or various patterns and designs may be printed on the surface thereof.

Up to this point, the first resin layer 24 laminated on the first paper layer 23 on one side of the foam board 1 has been described. However, the first resin layer 24 on the other side of the foam board 1 is laminated on the second paper layer 33. Since the explanation of the second resin layer 34 is the same as the explanation of the first resin layer 24, the explanation is omitted.
The first resin layer 24 and the second resin layer 34 may be the same as or different from each other, but are preferably the same resin layer. By laminating the same resin layer on both the front and back surfaces of the foam plate 1, the front and back tension of the foam plate 1 is made uniform, and the warpage of the laminated structure plate 10 can be easily prevented.

<Adhesive layer and release paper>
On the first resin layer 24 of the base paper 20 constituting the front side of the laminated structure board 10, a release paper 40 is affixed via an adhesive layer 25 laminated on the surface of the resin layer 24. When the release paper 40 is peeled off when the laminated structure board 10 is used, the pressure-sensitive adhesive layer 25 on the first resin layer 24 is exposed. Exhibits such as photographs, posters, and advertisements can be affixed to the exposed adhesive layer 25.

  As shown in FIG. 1, the release paper 40 used in this embodiment has resin films 47 and 49 formed on both sides of a release mount 46, and the surface of the resin film 47 on the side facing the adhesive layer 25. Is a composite paper in which a release agent layer 48 interposed between the pressure-sensitive adhesive layer 25 and the resin film 47 is formed. The release agent layer 48 has a function of adjusting the adhesive strength of the release paper 40 to the adhesive layer 25 and facilitating the release paper 40 to be peeled from the adhesive layer 25 when desired. The release agent layer 48 is preferably a silicone coat layer, for example.

  The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 25 is not particularly limited, and known pressure-sensitive adhesives such as acrylic acid pressure-sensitive adhesives, natural rubber latex pressure-sensitive adhesives, and vinyl acetate pressure-sensitive adhesives are applicable. Among these, an acrylic acid-based pressure-sensitive adhesive that has a stable adhesive force, can easily adjust the strength of the adhesive force, and has less odor is preferable. In particular, an emulsion-type pressure-sensitive adhesive containing an acrylate ester is preferable, and polybutyl acrylate is most preferable.

  The pressure-sensitive adhesive layer 25 can be formed by applying a pressure-sensitive adhesive or a composition containing a pressure-sensitive adhesive and drying it as necessary. The coating method is not particularly limited, and for example, a known method such as a gravure roll type rotary coating machine or a roll coater can be applied.

  The pressure-sensitive adhesive layer 25 may be flat, or irregularities may be provided on the surface of the pressure-sensitive adhesive layer 25. When unevenness is provided on the surface of the pressure-sensitive adhesive layer 25, it is possible to prevent air from being caught between the printed materials and the like. The method for providing the unevenness is not particularly limited, and a known method can be applied. For example, the surface which contacts the adhesive layer 25 of the release paper 40 is made into an uneven surface beforehand, and the method of forming the adhesive layer 25 to which the unevenness | corrugation was transferred by apply | coating an adhesive to the uneven surface is mentioned. .

The thickness of the pressure-sensitive adhesive layer 25 is not particularly limited, and may be appropriately adjusted according to the necessary adhesive force. For example, 15 to 35 g / m ² is preferable.

  Examples of the release paper 40 include composite paper in which resin films 47 and 49 such as a polyethylene film are laminated on a release mount 46 as shown in FIG. In addition, a multilayer composite paper in which a resin film such as a polyethylene film is further laminated may be used as an intermediate layer of the release mount 46, or a simple paper that does not have the resin films 47 and 49 is used as the release paper 40. You can use it.

The paper type of the release mount 46 is not particularly limited, and for example, craft paper, high quality paper, glassine paper, parchment paper, and the like are applicable. The total basis weight of the release paper 40 is preferably 50 to 150 g / m ² . When it is above the lower limit of the above range, it becomes difficult to tear when the release paper 40 is peeled off, and when it is below the upper limit of the above range, the release paper 40 can be prevented from becoming too heavy. Commercially available composite paper can be applied as the release paper 40 in which the resin films 47 and 49 are laminated on the release mount 46.

The method for forming the release agent layer 48 on the surface of the release paper 40 on the pressure-sensitive adhesive layer 25 side is not particularly limited. For example, a resin composition containing a silicone resin or a fluororesin is applied to the surface and dried appropriately. Known methods can be applied. For example, when the release agent layer 48 made of a silicone coat layer is formed, a release agent layer having an appropriate release strength can be formed by applying a silicone resin at about 3 to 5 g / m ² .

  In the laminated structure board 10 illustrated in FIG. 1, the adhesive layer 25 and the release paper 40 are provided only on the front side of the base paper 20, but the present invention is not limited to this configuration. In addition to the front side of the base paper 20, the pressure-sensitive adhesive layer 25 and the release paper 40 may be similarly provided on the front side (outside) of the backing paper 30. Further, the adhesive layer 25 and the release paper 40 may not be provided on either side of the base paper 20 and the backing paper 30. In this case, an exhibit such as a printed matter may be fastened to the laminated structure board 10 using a thumbtack or a pin.

<< Production method of laminated structure board >>
The method for manufacturing the laminated structure board 10 is not particularly limited, but a suitable example is shown below.
First, the polystyrene-based resin foam board 1 can be manufactured by various conventionally known methods, but it is particularly preferable to manufacture by a fusion method. In the fusion method, a melt-kneaded product of a polystyrene resin and a foaming agent is extruded and foamed into a cylindrical shape, and after cooling the outer surface of the cylinder immediately after extrusion, the cooled cylinder is crushed and overlapped and fused in two layers. The foam board 1 is manufactured by this.
Subsequently, as shown in FIG. 2, the foam plate 1 is fed out and an adhesive is applied to both surfaces of the foam plate 1 by a roll coater (not shown), and the base paper 20 and the backing paper 30 are removed from the pair of paper rolls 104. The sheet is fed out, overlapped on both surfaces of the foamed plate 1, crimped by a crimping roll 105, and cut into a predetermined size by a cutter 107. The laminated structure board 10 can be manufactured through these series of steps.

When manufacturing the laminated structure board 10 provided with the release paper 40 and the pressure-sensitive adhesive layer 25, in the pre-process of the cutting machine 107, the adhesive is applied on at least one of the base paper 20 and the backing paper 30 by a roll coater (not shown). It is possible to employ a method in which an adhesive is applied to form the pressure-sensitive adhesive layer 25, and the release paper 40 is further fed out from a roll (not shown) and laminated on the pressure-sensitive adhesive layer 25.
Alternatively, a laminated paper in which the adhesive layer 25 and the release paper 40 are laminated on the base paper 20 in advance can be used.

  As described above, in the method of manufacturing the laminated structure board 10, the step of providing the first adhesive layer 22, the first paper layer 23, and the first resin layer 24 on one surface of the foamed board 1 ( A first bonding step), and a step of providing the second adhesive layer 32, the second paper layer 33, and the second resin layer 34 on the other surface of the foam plate 1 (second bonding step). It is preferable to have. In the above-described method, the first bonding step and the second bonding step are performed in parallel, so that the manufacturing efficiency is high.

In the said manufacturing method, the adhesive agent whose solid component with respect to the gross mass before application | coating is 65-80 mass% is used as an adhesive agent, and the said solid component after adhesion | attachment is 5-30 g / cm < ² >. Is preferably applied to one surface and the other surface of the foam plate 1. One reason for this is that, as described above, it is easy to suppress warping of the manufactured laminated structure board 10.

  In the above manufacturing method, it is preferable to use paper having a water immersion elongation of 2.2% or less as the first and second paper layers 23 and 33 constituting the base paper 20 and the backing paper 30. One of the preferable reasons is that it is possible to prevent the moisture contained in the adhesive from affecting the expansion and contraction of the paper layers 23 and 33 and causing the manufactured laminated structure board 10 to warp.

  Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited to the following examples.

[Example 1]
A composite paper in which a polyethylene film of 20 g / m ² is laminated on the surface of a high-quality paper of 128 g / m ² and a water immersion elongation of 2.1% is used as a base paper, and an adhesive layer is formed on the film side of the base paper. Polybutyl acrylate (trade name “Sdyne # 7450” manufactured by Sekisui Chemical Co., Ltd.) is applied at 24 g / m ² , then a release paper is laminated thereon, wound up in a roll shape, and a long tack paper is obtained. Obtained.
The release paper has 20 g / m ² of polyethylene film laminated on both sides of 78 g / m ² of kraft paper, and a release agent layer for adjusting the peel strength of the release paper and the adhesive layer on the polyethylene film surface. 4 g / m ² of silicone resin is applied.
On one side (front side) of a polystyrene resin foam plate having a length of 1820 mm, a width of 910 mm, a thickness of 5 mm, and a density of 0.075 g / cm ³ , an ethylene / vinyl acetate copolymer emulsion adhesive (Nogawa Chemical Co., Ltd.) Manufactured by Diabond DW2060, solid component 70% by mass, viscosity 10400 mPa · s) 18 g / m ² . Further, the tack paper was laminated so that the surface on which the adhesive paper was applied was attached to the surface of the quality paper constituting the tack paper.
18 g / m ² of ethylene / vinyl acetate copolymer emulsion adhesive (diabond DW2060) as an adhesive was applied to the other side (back side) of the polystyrene resin foam plate, and the composite paper (basis weight 128 g / m ² ) was applied. A composite paper in which a 20 g / m ² polyethylene film was laminated on ² high-quality paper was laminated as a backing paper to prepare a display panel mount.
The following table shows the moisture and warpage amount in each composite paper constituting the base paper (a) on the front side and the back paper (b) on the back side of the display panel mount 30 days after the creation.

[Example 2]
A display panel mount was prepared in the same manner as in Example 1 except that the amount of the aqueous adhesive applied to one surface of the polystyrene resin foam plate was changed to 21 g / m ² .
The following table shows the moisture and warpage amount in each composite paper constituting the base paper (a) on the front side and the back paper (b) on the back side of the display panel mount 30 days after the creation.

[Example 3]
Example 1 except that the base paper of the tack paper and the fine paper constituting the backing paper used on the opposite side of the tack paper were changed to a fine paper having a basis weight of 83 g / m ² and a water immersion elongation of 2.5%. A display panel mount was created in the same way.
The following table shows the moisture and warpage amount in each composite paper constituting the base paper (a) on the front side and the back paper (b) on the back side of the display panel mount 30 days after the creation.
When the warpage of the obtained display panel mount was measured, the warpage amount after 30 days was as shown in the following table.

[Comparative Example 1]
A display panel mount was prepared in the same manner as in Example 1 except that the amount of the water-based adhesive applied to both the front and back sides of the polystyrene resin foam plate was changed to 35 g / m ² .
When the moisture content in each composite paper constituting the base paper (a) and the backing paper (b) of the display panel mount 30 days after creation was measured, it was 11% or more as shown in the following table. Further, the warpage amount after 1 day of creation was as large as 16 mm, and the warpage amount after 30 days was also large as shown in the following table.

[Comparative Example 2]
A water-based adhesive applied on both the front and back sides of a polystyrene resin foam board is an ethylene / vinyl acetate copolymer aqueous emulsion adhesive (Nichiei Kako Co., Ltd., AV-755NLH, solid component 55% by mass, viscosity 1500 mPa). A display panel mount was prepared in the same manner as in Example 1 except that it was changed to s).
The following table shows the amount of water in each composite paper constituting the base paper (a) on the front side and the back paper (b) on the back side of the display panel mount 30 days after creation. Further, when the warpage of the obtained display panel mount was measured, the warpage amount after 1 day of creation was as small as 5 mm, but the warpage after 30 days of creation became large as shown in the following table.

[Comparative Example 3]
Change the amount of aqueous adhesive applied to the surface of the tack paper side, which is the front side of the polystyrene resin foam plate, to 21 g / m ^2, and change the amount of aqueous adhesive applied to the back surface opposite to the tack paper side. A display panel mount was prepared in the same manner as in Example 1 except that the amount was 18 g / m ² .
The following table shows the moisture and warpage amount in each composite paper constituting the base paper (a) on the front side and the back paper (b) on the back side of the display panel mount 30 days after the creation.

<Measurement method>
The results in the following table were determined by the following measurement method.

(Measurement of water content)
The moisture content was measured by storing the display board 30 days after production in a room maintained at 23 ° C. ± 3 ° C. and humidity 60% ± 5% for 24 hours, then cutting out the central part of the display board into a 20 cm square, The paper is peeled off from the cutout polystyrene-based resin foam board of the display board so that no adhesive or film remains on the paper surface and the paper surface is exposed. Using a moisture meter (main body: MR-200, measurement probe: standard probe KG-PA for paper and cardboard, manufactured by Sanko Electronics Laboratory Co., Ltd.) on the exposed paper surface within 5 seconds, 23 ° C. ± 3 ° C. The measurement was performed by pressing the measuring probe of the moisture meter against the exposed paper surface in an atmosphere of humidity 60% ± 5%, and the maximum value of the measured value was the moisture content of the paper.

(Measurement of warpage)
The amount of warpage is measured by placing a display board having a length of 1820 mm and a width of 910 mm on a flat surface, and measuring the lifting distance (mm) from the flat surfaces of the four corners of the display board. The measurement was performed on both sides, and the maximum value of the measured values at 8 locations was set as the warp value.

(Judgment of warpage)
A: Less than 5 mm: The amount of warpage is extremely small and excellent.
A: 5 mm or more and less than 10 mm: The amount of warping is sufficiently small and good.
Δ: 10 mm or more and less than 15 mm ... The amount of warpage is small and acceptable.
X: 15 mm or more: The amount of warpage is large, which is defective.

(Measurement of water immersion elongation of paper)
A test piece having a width (flow direction of the paper machine) of 40 mm and a length (width direction of the paper machine) of 200 mm is cut out, a line is drawn in the center of the width so as to be parallel to the length direction, and the line before being immersed in water. The length L0 is measured. After the test piece was immersed in distilled water for 15 minutes, the length L1 of the line immediately after taking out from the water was measured, and the water immersion elongation was determined from the following equation.
Formula: Submerged elongation (%) = [(L1-L0) / L0] × 100

In the above table, the adhesive is as follows.
Adhesive A: Nogawa Chemical Co., Ltd., Diabond DW2060, solid component about 70% by mass, volatile component (solvent component) about 30% by mass
Adhesive B: manufactured by Nichiei Kako Co., Ltd., AV-755NLH, solid component about 50% by mass, volatile component (solvent component) about 50% by mass

  In the laminated structural boards of Examples 1 to 3, the moisture content of the first and second paper layers is 10.0% by mass or less, and the absolute value of the difference in moisture content (difference in moisture content) is Since it was 1.5 points (1.5%) or less, the warpage amount was small even 30 days after the production. In Examples 1 and 2, since the high quality paper having a water immersion elongation of 2.2% or less was used, the amount of warpage was smaller than that in Example 3. In Example 1, the amount of warpage became extremely small by making the application amount of the aqueous adhesive smaller than that in Example 2.

  In the laminated structural boards of Comparative Examples 1 and 2, since the moisture content of both the first and second paper layers was more than 10.0% by mass, the amount of warpage was large. In Comparative Example 1, the moisture content of the paper layer increased because the amount of adhesive applied was too large. In Comparative Example 2, the water content of the paper layer increased because the amount of water as the solvent for the applied adhesive was large and the solid component was small. In Comparative Example 3, the moisture content of each paper layer was 10.0% by mass or less, but the difference in moisture content was more than 1.5 points (1.5%), so the amount of warpage was large. . The reason why the water content difference is 1.5 points or more is presumed to be because the amount of the aqueous adhesive applied to both surfaces of the foamed plate differs for each surface.

DESCRIPTION OF SYMBOLS 1 ... Polystyrene-type resin foam board (foam board), 10 ... Laminated structure board, 20 ... Base paper, 22 ... 1st adhesive layer, 23 ... 1st paper layer, 24 ... 1st resin layer, 25 ... Adhesive layer, 30 ... backing paper, 32 ... second adhesive layer, 33 ... second paper layer, 34 ... second resin layer, 40 ... release paper, 46 ... release mount, 47 ... resin film, 48 ... release agent layer, 49 ... resin film,
DESCRIPTION OF SYMBOLS 100 ... Roll, 101 ... Foam sheet, 102 ... Guide roll, 103 ... Steam foaming tank, 104 ... Paper roll, 105 ... Adhesive heat roll, 106 ... Cooling roll, 107 ... Cutting machine

Claims (6)

A polystyrene resin foam plate is provided, and a first adhesive layer, a first paper layer, and a first resin layer are provided in this order on one surface of the polystyrene resin foam plate, and the polystyrene resin foam On the other side of the plate, a second adhesive layer, a second paper layer, and a second resin layer are provided in this order,
The water content of each of the first paper layer and the second paper layer is 10% by mass or less, and [the water content of the first paper layer (% by mass)]-[the second paper layer] The moisture content (% by mass)] of the laminated structure plate is 1.5 or less. It said first adhesive layer and said second adhesive layer is a solid component 5 to 30 g / m ^2, laminated structure plate according to claim 1. The laminated structure board according to claim 1 or 2, wherein the first paper layer and the second paper layer have a water immersion elongation of 2.2% or less. The pressure-sensitive adhesive layer and the release paper are laminated in this order on both or any one of the first resin layer and the second resin layer, respectively. Laminated structure board. A method for producing a laminated structure board according to any one of claims 1 to 4,
Providing the first adhesive layer, the first paper layer, and the first resin layer on one surface of the polystyrene resin foam plate;
Providing the second adhesive layer, the second paper layer, and the second resin layer on the other surface of the polystyrene resin foam plate;
The manufacturing method of the laminated structure board which has this. The manufacturing method of the laminated structure board of Claim 5 which provides said 1st adhesive bond layer and 2nd adhesive bond layer using the adhesive agent of 65-85 mass% of solid components.

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