JP2010048024A - Decorative plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a decorative plate using a porous noncombustible base material, producible in a factory without using a tack sheet and considerably improving productivity. <P>SOLUTION: The decorative plate is formed by wrapping the surface of the porous noncombustible base material, at least one side face out of all side faces, and a part of a back face with a decorative sheet. In the decorative plate, the applied width of an adhesive on the side face and back face wrapped and stuck with the decorative sheet consists of both side parts having outside ranges of 20% each when dividing the applied width into five equal parts, and a center part other than both side parts, and the applied amount of both side parts is more than the applied amount of the center part. One of both side parts is arranged at the side face of the base material, and the other of both side parts is arranged at the end of the decorative sheet wrapped part of the back face of the base material. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a decorative board in which a decorative sheet is wound around a surface of a porous non-combustible substrate, at least one of all side surfaces, and a part of the back surface.

  On the walls of buildings, hotels, condominium lobbies, meeting rooms, and office walls, use a tack sheet with a porous non-combustible base material such as calcium silicate board on the back of the decorative sheet. Even when the site is constructed or there are joints on the groundwork, it is also constructed on the site including the joints with a tack sheet to produce a nice looking living space.

  In particular, when the construction quantity is large on the wall with joints, the surface of a porous non-combustible substrate such as a calcium silicate board is laminated with a decorative sheet in advance of factory production rather than on-site construction. Extend and fold back to the back of the substrate to bond it and hide the forehead to make an interior decorative board. Prior to affixing the decorative plate to the wall surface of the site, it has been proposed to apply a joint tape to a portion of the board that serves as a joint base between the decorative plates. (See Patent Document 1)

  In recent years, many wall joints have been constructed with horizontal joints as well as vertical joints. In this case, the top, bottom, left, and right fore edge and back are covered with a decorative sheet, and the same measures are taken. (Four-sided decorative board)

However, in the case of a porous non-combustible substrate such as a calcium silicate plate, the surface is powdery and the surface strength is weak, so at least the surface and the side surface of the substrate are sealed with a predetermined method after the sealer treatment. The surface and side surfaces of the material were rolled up.
In particular, when there is no sealer treatment on the side surface of the base material, there is a problem that the sheet floats on the side surface of the base material, the flatness is lowered, and the design property and unity as a panel are deteriorated.

Therefore, when processing using the above-described tack sheet, the porous non-combustible base material is cut into a predetermined size, and after dust removal, the base material, the side surface and the back surface where the entrainment is performed, the synthetic rubber system The sealer is applied manually. Then, after laminating a large tack sheet including the winding allowance on the surface while peeling the release paper, the substrate is reversed, and the winding allowance is cut to a specified width, and then manually wound. Is the actual situation.
When a tack sheet is not used, a urethane sealer is applied to the front and back surfaces of a large porous non-combustible substrate with a sponge roll coater, and then the substrate is cut to a specified size. Then, after roll-coating the adhesive on the surface of the base material, a sheet larger than the base material size is laminated and cured until an adhesive force is produced, and then the four-side end portions and unnecessary portions of the entrained portion are cut off. A synthetic rubber sealer is manually applied to the side surface of the base material, and then a double-sided adhesive tape is attached to the back side of the sheet at the winding portion, and then manually wound around the base material.

Therefore, when a tack sheet is used, the release sheet is used and adhesive processing is performed, so that the tack sheet becomes expensive and there is a problem of disposal of the release sheet.
Furthermore, there is a problem in that both the case where the tack sheet is used and the case where the tack sheet is not used require a lot of manual work and a great deal of labor and time.

JP-A-5-340057

  An object of the present invention is to provide a decorative board using a porous non-combustible base material, which can be produced in a factory without using a tack sheet under such circumstances and greatly improves productivity. To do.

As a result of intensive studies to achieve the above-mentioned object, the present inventor efficiently produced a factory by applying an adhesive in a specific application form on the side surface and / or the back surface of the porous non-combustible substrate. The inventors have found that this is possible and have completed the present invention.
That is, the present invention
[1] In a decorative board in which a decorative sheet is wound around a surface of a porous non-combustible substrate, at least one side face of all the side faces, and a part of the back face, the side face on which the decorative sheet is wound and stuck; The width of the adhesive on the back surface is composed of both sides of the outer 20% range when the coating width is divided into 5 equal parts, and a center part other than the both sides, and the amount of application on both sides is the center. More than the coating amount of the part, and one of the both side parts is arranged on the side surface of the base material, and the other side of the both side parts is arranged at the end part of the decorative sheet winding part on the back surface of the base material Decorative veneer,
[2] The decorative board according to the above [1], wherein the application amount on both side portions is 1.3 times or more of the application amount on the central portion.
[3] The decorative board according to [1] or [2], wherein the adhesive is a hot melt adhesive or a reactive hot melt adhesive.
[4] The decorative board according to any one of [1] to [3], wherein the coating amount of the adhesive is 50 to 200 g / m ² in the entire coating width.
[5] The decorative board according to any one of [1] to [4], wherein the adhesive is applied in a non-contact manner,
[6] The decorative board according to [5], wherein the adhesive is applied by spiral spray coating.
[7] The decorative plate according to the above [6], wherein the diameter of the nozzle of the spiral spray coat is 0.5 mm or less, and [8] Hot melt by spiral spray coat without performing sealer treatment on the side surface of the substrate. The decorative board according to any one of the above [1] to [7], which is formed by applying an adhesive or a reactive hot melt adhesive,
Is to provide.

According to the present invention, it is possible to provide a decorative board using a porous non-combustible substrate, which can be produced in a factory without using a tack sheet and greatly improves productivity. Furthermore, according to the present invention, a four-sided decorative board can also be produced at a factory with high productivity.
Specifically, by applying the adhesive in the above-mentioned application form on the side surface and part of the back surface of the porous non-combustible substrate, the side surface of the porous non-combustible substrate without using a tack sheet And even if sealer processing was not performed on a part of the back surface, the decorative sheet was not lifted on the side surface of the substrate after the entrainment, and sufficient peel strength between the back surface of the substrate and the decorative sheet could be obtained.

The decorative board of the present invention is a decorative board in which a decorative sheet is wound around a surface of a porous non-combustible substrate, at least one side face in all side faces, and a part of the back face. The width of the adhesive on the side surface and the back surface is 20% outside when the coating width is divided into 5 equal parts. 60% on the inner side of the width), the coating amount on both side portions is larger than the coating amount on the central portion, and one of the both side portions is disposed on the side surface of the substrate, and the other of the both side portions is the base. It is arrange | positioned at the edge part of this decorative sheet winding part of the back surface of material.
The application amount on both side portions is larger than the application amount on the central portion, thereby preventing the decorative sheet from floating on the side surface of the substrate after entrainment without excessively applying the adhesive. Sufficient peel strength with the sheet could be obtained. This reduced the cost of the adhesive and enabled efficient factory production. From these viewpoints, it is preferable that the coating amount on both side portions is 1.3 times or more of the coating amount on the central portion. If it is 1.3 times or more, the average application density on both sides will be about twice or more the average application density in the center.

  The porous nonflammable substrate used in the decorative board of the present invention is preferably an inorganic substrate because nonflammable performance is required. The inorganic base material can be used without particular limitation as long as it has nonflammability. For example, calcium silicate board, gypsum board, rock wool, volcanic glass multilayer board (according to JIS A5440 “incombustible volcanic glassy multilayer board”), asbestos slate, dielite, pasco board, cement Examples include non-combustible plates (lightweight cement plates, etc.), ceramics, glass, metal plates.

As thickness of the base material used for the decorative board of this invention, 3-20 mm is preferable, 3-12 mm is more preferable, 3-6 mm is especially preferable.
Further, the corner portion of the base material may be rounded by applying C surface processing or R surface processing. Here, the C surface processing refers to processing for creating a C surface by scraping off the corners. The C plane refers to a small surface formed at a portion connecting the three-dimensional surface to the surface, so-called a corner or an edge, and the corner is usually chamfered at 45 degrees. R surface processing refers to processing for making the corners of the substrate R (R is a radius), that is, processing for making the corners round.

  The decorative sheet used in the decorative board of the present invention is a resin-based decorative sheet as long as it can be flat-laminated on the surface (top surface) of the base material and the decorative sheet can be wound around the side surface and the back surface of the end portion. A base sheet such as a paper-type decorative sheet, nonwoven fabric, cloth, and veneer, or a decorative sheet composed of two or more types can be used. A vinyl chloride resin layer, an olefin resin layer, a wallpaper obtained by laminating the foam and paper, and the like are also possible. You may emboss the surface of a decorative sheet.

Examples of resin-based decorative sheets include polyester resins such as polyethylene terephthalate (PET), acrylic resins, polyethylene resins, polypropylene resins, polybutene resins, ethylene-propylene copolymer resins, and ethylene-propylene-butene copolymer resins. Polyolefin resins such as olefin thermoplastic elastomers, polycarbonate resins, acrylic modified urethane resins, polyester modified urethane resins, polyurethane resins such as vinyl chloride-vinyl acetate copolymer modified urethane resins, polystyrene resins , Vinyl chloride resin, vinyl acetate resin, vinyl chloride-vinyl acetate copolymer resin, and the like, and one or more of them can be used in combination.
Resin-based decorative sheets are suitable because they are flexible and have good follow-up performance for entrainment processing. In addition, as the resin, when a vinyl chloride resin sheet is used, there is a problem of generation of hydrochloric acid gas at the time of disposal incineration, a problem of a plasticizer, and the like. Can be preferably used. You may emboss the surface of a resin-type decorative sheet.

A doubling sheet obtained by laminating the resin layer A and the resin layer B made of the above resin can also be used. In this case, the resin used for the resin layer A and the resin layer B may be the same or different.
The surface of the doubling sheet may be embossed, and the doubling sheet that has been embossed is called a doubling embossed sheet.
The doubling sheet is, for example, provided with a primer layer by performing a corona discharge treatment on the surface of the resin layer A made of the above resin, and after printing a pattern layer (solid ink layer and / or pattern ink layer) on the resin layer A, The resin layer B made of the above resin is obtained by bonding and pressure bonding by a method such as extrusion lamination, dry lamination, wet lamination, thermal lamination or the like.
Further, a surface protective layer may be provided on the resin layer B for the purpose of imparting abrasion resistance, scratch resistance, contamination resistance, and the like. The resin layer A is generally a colored resin sheet, but may be a non-colored sheet. The resin layer B is preferably transparent, and a transparent resin sheet is generally used, but a transparent resin may be applied.

In the case of a paper-type decorative sheet, impregnated paper impregnated with thin paper having a weight of 20 to 300 g / m ² , inter-paper reinforcing paper, latex and the like can be used. Considering the strength of the sheet at the time of entrainment and the interlayer strength of the paper quality, impregnated paper is good. Similarly to the resin-based decorative sheet, a printed layer and a surface protective layer may be provided on the surface.
As the nonwoven fabric, fibers of thermoplastic resin such as thermoplastic polyester resin, acrylic resin, polyamide resin, vinylon, polyvinyl chloride, and polypropylene are used. Alternatively, a mixture of a plurality of fibers may be used. As a basic weight, a thing of 20-100 g / m < ² > can be used. Similarly to the resin-based decorative sheet, a printed layer and a surface protective layer may be provided on the surface. Moreover, you may laminate | stack with a resin film.

The veneer is a thin sheet of sliced wood, and the thickness of a normal veneer is preferably 0.05 to 1.0 mm, more preferably about 0.1 to 0.3 mm.
Since the veneer alone cannot be rolled up, it is preferable to laminate a transparent plastic film with an adhesive.
As the transparent film, films of polyethylene, polypropylene, polyvinyl chloride, polyvinylidene chloride, polycarbonate, polyamide, polystyrene, polyvinyl alcohol and the like can be used. The thickness of the film is preferably about 0.02 to 1 mm, more preferably about 0.05 to 0.3 mm, and the film can be colored or transparently printed on the film.

Next, it demonstrates still in detail according to the order of the process of manufacturing the decorative board of this invention.
(1) First, the surface of the base material is coated (coated) with the adhesive a. As a method for applying the adhesive a, a roll coater, a flow coater, a spray coat, a heated roll coater (in the case of a hot melt adhesive or a reactive hot melt adhesive) or the like can be used as appropriate.
The substrate may be coated with the adhesive a after the substrate is cut to a predetermined size, or the substrate may be cut to a predetermined size after the adhesive a is coated on the substrate.

When the porous nonflammable substrate is an inorganic substrate, there are many alkaline substrates and the surface is powdery. In this case, if necessary, a sealer treatment may be performed on the surface of the substrate prior to coating with the adhesive a. The sealer can improve the reinforcing effect of the surface layer of the base material and the adhesiveness of the adhesive used later.
Urethane, epoxy and acrylic solvents and water-based sealers can be generally used. In addition to organic materials, water glass inorganic sealers can also be used.
A typical sealer is a moisture curable urethane resin sealer.
Various coating methods such as roll coating, sponge roll coating, spray coating, curtain flow coating and the like can be used as the sealing method.

(2) Next, the decorative sheet is laminated on the surface of the adhesive a-coated surface of the base material coated with the adhesive a in (1) with a margin left on at least a part of the front, rear, left, and right sides of the base material. The Lamination is usually performed by lamination.
When the side surface of the base material is wound in two directions, a decorative sheet may be arranged wider than the base material, and a margin equal to or greater than that of the side surface and / or the back surface of the base material may be provided. In the case of four-way winding, it is only necessary to provide a margin equal to or greater than that of the entangled portion on the front, rear, left and right sides of the substrate.

(3) Next, unnecessary portions of the decorative sheet are cut off as necessary. This excision is usually performed at the stage where the adhesive sheet adheres to the base material after the base material has been subjected to pressure curing, and the protruding portion other than the entangled portion of the decorative sheet is cut off with a cutting machine. Cut to length. Therefore, when the margin of the decorative sheet is only the entangled portion and there is no protruding portion, there is no need to cut out.
In the case of four-way winding, unnecessary parts at the four corners are cut and deleted. In this case, punching is preferable to ensure accuracy. This accuracy is preferably within ± 0.5 mm with respect to the specified dimension. If this standard is not satisfied, a gap may be formed or protruded at the joint surface of the corner, resulting in poor appearance. When punching accuracy is ensured, punching may be performed simultaneously with cutting of the protruding portion.
Moreover, you may color with the same color as a decorative sheet beforehand with water-based paint or a touch pen so that a corner part may not be conspicuous.

(4) Next, the application amount on both sides of the adhesive application width on the side surface and / or back surface portion of the base material corresponding to the blank portion (entrainment portion) of the decorative sheet is larger than the application amount in the central portion. The adhesive b is applied so that
FIG. 1 is a diagram illustrating an example of application of an adhesive to a part of a side surface and a back surface of a base material in a decorative board 1 of the present invention. In FIG. 1, first, the base material 2 on which the decorative sheet 3 is laminated is reversed as necessary, and the base material 2 is fixed at a predetermined position.
For example, the adhesive b such as a hot-melt adhesive is heated, and a low-viscosity molten state is pumped (not shown) from the coating head 4 of the coating apparatus to the side 2a and the back 2b of the base 2 The adhesive b is discharged to the part. At this time, the application start position and end position of the adhesive b may be sensor sensing or position presetting. The moving speed of the coating head 4 is 5 to 60 m / min, and the coating amount and the like are appropriately adjusted according to the surface condition. The moving speed may be partially changed.

  Here, as shown in FIG. 1, one of both sides of the adhesive application width is disposed on the side surface of the base material, and the other of the both side portions is disposed at the end of the decorative sheet winding portion on the back surface of the base material. It is important to This increases the amount of adhesive applied to the end of the decorative sheet entrainment portion on the side surface of the base material and the back surface of the base material, and does not use a tack sheet, and the side surface of the porous nonflammable base material and / or Alternatively, sufficient peel strength between the base material and the decorative sheet can be obtained without performing a sealer treatment on the back surface.

The coating head 4 is preferably installed in, for example, a single-axis robot (not shown) and the coating operation is automatically performed. One coating head 4 may be used, or a plurality of coating heads 4 may be used in conjunction with each other. When applying with one coat head, as shown in FIG. 1, it can respond by applying from the diagonal direction of the base material 2. FIG. An oblique angle of 30 to 60 ° is conceivable, but 45 ° is optimal for uniform application on both sides. In the case of applying with a plurality of coat heads, 0 to 90 ° application is conceivable.
Further, if a plurality of coating devices are installed and, for example, different side surfaces of the base material and / or different back surfaces of the base material are simultaneously applied, production can be efficiently performed.
The above contents may be applied by fixing the coat head and moving the substrate 2 by driving a guide roll.

  FIG. 2 is a diagram showing the locus of application when an adhesive is applied on a flat surface by spiral spray coating according to the present invention. The width of the coating is divided into two sides of the outer 20% range (20% of the coating width) when the coating width is divided into 5 equal parts, and the central part (60% of the coating width) consisting of other than both sides. It is made up of.

In the decorative board of this invention, it is preferable that the application quantity of the adhesive agent to at least one part of the side surface of a base material and a part of back surface is 50-200 g / m < ² > in the whole coating width. If it is 50 g / m ² or more, sufficient peel strength between the base material and the decorative sheet can be obtained, and if it is 200 g / m ² or less, the laminated side surface does not cause unevenness of the sheet and it is entangled. It is possible. When the application amount of the adhesive is increased, the flow of the adhesive occurs when the laminate is pressure-bonded, and unevenness (warping) is generated on the side surface, which is not desirable in appearance.
In the decorative board of the present invention, one of both side portions of the adhesive application width is disposed on the side surface of the base material, and the other of the both side portions is disposed on the end portion of the decorative sheet winding portion on the back surface of the base material. In order to apply efficiently, it is preferable to apply the adhesive b in a non-contact manner.

Non-contact coating methods include bead coating, dot coating, spiral spray coating, spray coating, curtain coating, and the like. Or the spiral spray coat and spray coat which are the application | coating methods which spread | diffuse a film with air and coat wide are preferable.
The curtain coat is also non-contact, but it is not preferable when intermittent coating of the part in the flow direction of the substrate cannot be performed.

Among the above, spiral spray coating has good workability and simple application system. In addition, the application amount on both sides of the adhesive application width can be made larger than the application amount in the center by one application. This is particularly preferable because the coating amount on both sides can be 1.3 times or more the coating amount on the central portion. By matching both sides of this coating width to the part where the base material and the decorative sheet are in close contact with the side of the base material and the end of the decorative sheet entrainment part on the back surface, the overall efficiency is low and the application amount is low. A decorative board can be manufactured.
Furthermore, when the diameter of the nozzle of the spiral spray coat is 0.5 mm or less, it is possible to suitably prevent a situation in which unevenness (flickering) remains on the side surface of the base material even if the wire is not thickened and is pressed during lamination. it can.
Thus, by using spiral spray coating, a hot melt adhesive or a reactive hot melt adhesive can be suitably applied immediately without performing a sealer treatment on the side surface of the substrate.

  The spiral spray coat described above is discharged from the central hole, and at the same time, a spiral airflow is generated from several oblique holes around the outlet, and the adhesive b is swirled and draws a circular orbit. In this method, a spiral coating surface is formed by moving the coating head 4. When multiple spiral spray coats are used, the diameter of the spiral will be reduced, and the start and end of the adhesive will be closer to the line, and if the shape of the start and end entrainment is made trapezoidal, application close to that shape The shape can be reproduced by spiral synthesis.

  As for the application of the adhesive for adhering the decorative sheet, the application of the decorative sheet surface is also conceivable, but when a hot-melt adhesive heated to around 180 ° C. is applied to the plastic film, the olefin-based film and the vinyl chloride film are Spiral spraying is not preferable because it is damaged by heat and deformed, and spiral spraying stirs with hot air at the same time as the adhesive b is applied.

(5) Next, the blank portion of the decorative sheet 3 is wound around the side surface or the back surface of the substrate 2 while being crimped. As a winding method, a method of gradually winding a large number of rollers at different angles can be generally used. In addition, a folding method using a pressure-bonded rubber or a wrapping roll method in which a bending guide is attached to a part of the roller may be used.
For example, the wrapping roll of the wrapping apparatus may be fixed and controlled by a single-axis robot with the base material 2 fixed, or the wrapping roll is fixed to the stage and the base material 2 is moved by the drive roll in the meantime. You may do it. The moving speed of the wrapping roll is usually 5 to 60 m / min, and is appropriately adjusted according to the entrainment situation. Two side surfaces of the substrate 2 may be simultaneously wound, or may be wound for each side surface.
Moreover, the wrapping roll is fixed, the base material 2 moves, and the blank part of the decorative sheet 3 may be simultaneously wound on two opposing surfaces of the side surface of the base material 2, and can be wound in four directions by two windings. In addition, in the case of four-way winding by the method of winding one side surface, when the winding of one side is completed, the same operation is performed on the next side, and the four-side winding is completed by repeating four times. In order to improve the design, four-way winding in which the blank portion of the decorative sheet 3 is wound around all the side surfaces of the base material 2 is preferable.
While the adhesive b applied in the above (4) has tackiness (open time), it is necessary to continuously advance the winding.

[Adhesive a]
In the present invention, suitable examples of the adhesive a that coats (covers) the surface of the base material include urethane, vinyl acetate, EVA (ethylene vinyl acetate copolymer resin), acrylic, synthetic rubber, Various resins such as polyamide and epoxy can be appropriately used in accordance with the types of the decorative sheet 3 and the substrate 2. In addition, a water-based resin adhesive, a solvent-based resin adhesive, a solventless hot-melt adhesive, and the like can be appropriately selected.
As the adhesive a used in the present invention, if the adhesive sheet has a certain degree of adhesion immediately after the decorative sheet is laminated on the surface of the base material, it can be directly cut and processed without being cured. Specifically, after the lamination, cutting can be performed if an adhesive force of 0.5 kg / 25 mm width or more appears during the processing waiting time.
As such an adhesive, a reactive hot melt adhesive or an aqueous wrapping adhesive that can provide strong tackiness when dried is preferable. As the resin system, a urethane system, an acrylic system, an EVA system, and the like are preferably exemplified.
In particular, the reactive hot melt adhesive does not need to be dried, can be coated at a heating temperature of a roll coater of around 120 ° C., exhibits adhesive strength to the substrate 2 in a short time, and can be processed in the next process. This is desirable.

[Adhesive b]
In the present invention, the adhesive b applied to at least one side surface and / or a part of the back surface of the entire side surface of the base material corresponding to the blank portion (rolling portion) of the decorative sheet is a hot melt adhesive or reaction. Hot melt adhesive is preferred. This is because, after the adhesive is applied, the next step, which is the next step, is performed quickly.
These hot melt adhesives and reactive hot melt adhesives are 100% solids adhesives that do not contain any organic solvent based on thermoplastic resins, and are solid or semi-solid at room temperature. The decorative sheet 3 is rolled up and laminated at a stage where it is melt-coated and hot tacky, and is cooled and solidified to complete the adhesion.

  Hot melt adhesives include rubber hot melt adhesives based on thermoplastic elastomers that exhibit rubber elasticity, such as styrene-conjugated diene-styrene block copolymers, hot melt adhesives based on polyolefin resins, ethylene EVA hot melt adhesive based on a random copolymer of vinyl acetate and vinyl acetate, and acrylic hot melt adhesive capable of sticky bonding with a polymer composed mainly of (meth) acrylic acid alkyl ester For example, tackifier resins, process oils (plasticized oils), softeners (plasticizers) are used as necessary for these main components. Additives such as antioxidants (anti-aging agents), heat stabilizers, light stabilizers, UV absorbers, colorants, fillers, etc. It is.

Examples of the thermoplastic elastomer of the rubber-based hot melt adhesive include rubbery block copolymers such as an ABA block copolymer and an AB block copolymer. Here, A represents a vinyl aromatic compound polymer block, and B represents a conjugated diene polymer block.
Examples of the ABA type block copolymer include styrene-butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), and these conjugated diene moieties are hydrogenated. Styrene-ethylene-butylene-styrene block copolymer (SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), and the like obtained. Examples of the AB type block copolymer include styrene-butadiene block copolymer (SB), styrene-isoprene block copolymer (SI), and styrene obtained by hydrogenating these conjugated diene moieties. -Ethylene-butylene block copolymer (SEB), styrene-ethylene-propylene block copolymer (SEP), etc. are mentioned.

  Examples of the polyolefin resin include polyethylene, polypropylene, a copolymer of ethylene and α-olefin other than ethylene, a copolymer mainly composed of ethylene of ethylene and vinyl acetate, and α other than propylene and propylene. -A copolymer with an olefin, etc. are mentioned.

  The reactive hot melt adhesive is a type having a reactive group in the molecule, and is a hot melt adhesive in which the characteristics of the reactive adhesive are added to the characteristics of the hot melt. Before curing, it dissolves by heating like ordinary hot melt adhesives, but after application, it crosslinks with moisture (humidity) in the air or in the base material, enabling adhesion with high adhesion and heat resistance. Become. A typical reactive hot melt adhesive is mainly composed of an isocyanate group-terminated urethane prepolymer having a highly crystalline polyester resin as a skeleton, and is a styrene copolymer that is a kind of main component in a normal hot melt adhesive. In addition to the polymer rubber, a tackifier resin is blended as necessary.

  As the urethane prepolymer used for the reactive hot melt adhesive, a urethane prepolymer having an isocyanate group at the terminal obtained by reacting various polyols with a polyisocyanate compound is used. As the polyol, one kind or two or more kinds of materials having one or more hydroxyl groups, such as a material such as polyester, polyether, butadiene and the like in which a hydroxyl group is added, are used. Among these polyols, it is particularly preferable to use a polyester polyol as a main component from the viewpoint of improvement in initial adhesive force and adaptability to a wide range of adherends. Examples of this include known dihydric alcohols and divalent carboxylic acids such as ethylene glycol, 1,4-butanediol, 1,6-hexanediol, 1,8-octanediol, neopentyl glycol, such as adipic acid and suberic acid. Polyester polyols can be exemplified by reaction with azelaic acid, sebacic acid, isophthalic acid and the like. The crystallinity of the urethane prepolymer obtained by the combination of these alcohols and acids depends on the crystallinity, but the crystallinity is not so important. As the polyether polyol, those synthesized from ordinary ethylene glycol, propylene glycol, neopentyl glycol and the like are used. Examples of the polyisocyanate compound include diisocyanates such as tolylene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, and xylylene diisocyanate, and modified products thereof, and one or more of these are used. The [NCO] / [OH] equivalent ratio is preferably 1.5 to 4.0. If it is less than 1.5, the viscosity of the resulting prepolymer will be too high, and if it exceeds 4.0, foaming will occur significantly during moisture curing, and the adhesive strength will be reduced. The properties of the polyurethane prepolymer thus obtained are not necessarily solid at room temperature, and if the adhesive force immediately after hot melt bonding can be appropriately obtained by the styrene copolymer rubber and / or tackifying resin to be mixed. The properties are not particularly limited.

Styrenic copolymer rubbers preferably used for reactive hot melt adhesives include random copolymer rubbers SBR and SIR, ABA block copolymers, AB block copolymers and A -(B-A) n-B block copolymer [where A is a polystyrene block or poly α-methylstyrene block, B is a polyolefin block for rubber (eg hydrogenated or non-hydrogenated polyisoprene or polybutadiene block), And n is 2 to 50], specifically, a polystyrene-polyisoprene-polystyrene block copolymer having a molecular weight of 7,000 to 200,000 (styrene content: 14 to 50% by mass), a molecular weight of 7, 00-150,000 polystyrene-polybutadiene-polystyrene block copolymer (styrene content: 20-50 quality) %), Polystyrene molecular weight 50,000 to 100,000 - hydrogenated polybutadiene - polystyrene block copolymer (styrene content: 10 to 40 wt%), and the like.
The tackifying resin is used in a pair with a styrene rubber copolymer, and is mixed with a urethane prepolymer to improve compatibility, adjust a solidification time, and improve initial adhesive strength.
The tackifying resin described later is appropriately used as necessary.

If desired, tackifying resin, process oil, softener, antioxidant, filler, pigment and the like are blended with the hot melt adhesive or other adhesive used in the present invention.
Examples of tackifying resins include rosin resins such as rosin, rosin acid ester, dimerized rosin, polymerized rosin, disproportionated rosin, and hydrogenated products thereof, terpene resins, terpene phenolic resins, and hydrogenated products thereof. Terpene resins, aliphatic hydrocarbon resins such as C5 petroleum resins, petroleum resins such as C9 petroleum resins and their hydrogenated products, phenol-modified hydrocarbon resins, xylene resins, coumarone indenes Examples thereof include resins, cyclopentamine resins, and ketone resins. In the case of what can be polymerized, the polymer, and in the case of what can be hydrogenated, the hydrogenated resin can be mentioned, but it is not particularly limited.
Process oils and softeners include, for example, liquid polybutene, liquid polypropylene, petroleum wax, paraffin wax, microcrystalline wax, synthetic wax, polyethylene grease, hydrogenated animal fatty oil, fish fatty oil, vegetable fatty oil, mineral oil, naphthion, Examples thereof include hydrocarbon oils such as paraffin mineral oil.
Examples of the antioxidant include hindered phenol-based antioxidants and hindered amine-based antioxidants.

The heating temperature of the hot melt adhesive (excluding the reactive hot melt adhesive) is usually 160 ° C. to 200 ° C. although it depends on the type of the adhesive. The heating temperature of the reactive hot melt adhesive is 100 to 130 ° C.
The melt viscosity at the time of heating of the hot melt adhesive and the reactive hot melt adhesive is preferably 2000 to 15000 MPa · s, more preferably 4000 to 8000 MPa · s. If the viscosity is high, the pattern of the spiral spray coat cannot be reproduced, and if the viscosity is low, the initial adhesive force is not obtained.

As a surface layer of a decorative sheet (particularly on the resin layer B in the case of a doubling sheet), a surface protective layer is provided for the purpose of imparting surface properties such as scratch resistance, abrasion resistance, water resistance, and contamination resistance. It is preferable.
Examples of the surface protective layer include a surface protective layer formed of a thermosetting resin and a surface protective layer formed by crosslinking and curing an ionizing radiation curable resin composition.
Among these, a surface protective layer obtained by crosslinking and curing the ionizing radiation curable resin composition is particularly preferable, and can be formed by a forming method described later.

  As thermosetting resins, polyester resins, polyurethane resins (including two-component curable polyurethane), epoxy resins, amino alkyd resins, phenol resins, urea resins, diallyl phthalate resins, melamine resins, guanamine resins, melamine-urea cocondensation Examples thereof include a resin, a silicon resin, a polysiloxane resin, and a thermosetting acrylic resin.

The ionizing radiation curable resin composition preferably used for the surface protective layer has an energy quantum capable of crosslinking and polymerizing molecules in electromagnetic waves or charged particle beams, that is, by irradiating ultraviolet rays or electron beams, etc. It is a composition comprising an ionizing radiation curable resin that is crosslinked and cured, and other desired components.
As the ionizing radiation curable resin used for the surface protective layer, a conventionally known compound may be appropriately used, and it is appropriately selected from a polymerizable monomer and a polymerizable oligomer or prepolymer conventionally used as an ionizing radiation curable resin. Can be used.
Typically, a (meth) acrylate monomer having a radical polymerizable unsaturated group in the molecule is suitable as the polymerizable monomer, and among them, a polyfunctional (meth) acrylate is preferable. Here, “(meth) acrylate” means “acrylate or methacrylate”.
As the polymerizable oligomer, an oligomer having a radical polymerizable unsaturated group in the molecule, particularly an acrylate oligomer having a radical polymerizable unsaturated group is preferable. For example, epoxy (meth) acrylate, urethane (meth) acrylate, polyester (Meth) acrylate type, polyether (meth) acrylate type, etc. are mentioned.

When an ultraviolet curable resin composition is used as the ionizing radiation curable resin composition, it is preferable to add about 0.1 to 5 parts by mass of the photopolymerization initiator with respect to 100 parts by mass of the resin composition. The initiator for photopolymerization can be appropriately selected from those conventionally used and is not particularly limited. For example, for a polymerizable monomer or polymerizable oligomer having a radically polymerizable unsaturated group in the molecule. Benzoin, benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, benzoin-n-butyl ether, benzoin isobutyl ether, acetophenone, dimethylaminoacetophenone, 2,2-dimethoxy-2-phenylacetophenone, 2,2-diethoxy-2 -Phenylacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1-hydroxycyclohexyl phenyl ketone, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholino-propane-1 - 4- (2-hydroxyethoxy) phenyl-2 (hydroxy-2-propyl) ketone, benzophenone, p-phenylbenzophenone, 4,4′-diethylaminobenzophenone, dichlorobenzophenone, 2-methylanthraquinone, 2-ethylanthraquinone, 2 -Tertiary butylanthraquinone, 2-aminoanthraquinone, 2-methylthioxanthone, 2-ethylthioxanthone, 2-chlorothioxanthone, 2,4-dimethylthioxanthone, 2,4-diethylthioxanthone, benzyl dimethyl ketal, acetophenone dimethyl ketal, etc. It is done.
Examples of the polymerizable oligomer having a cationic polymerizable functional group in the molecule include aromatic sulfonium salts, aromatic diazonium salts, aromatic iodonium salts, metallocene compounds, and benzoin sulfonic acid esters.
Moreover, as a photosensitizer, p-dimethylbenzoic acid ester, tertiary amines, a thiol type sensitizer, etc. can be used, for example.

  In the present invention, it is preferable to use an electron beam curable resin composition as the ionizing radiation curable resin composition. This is because the electron beam curable resin composition can be made solvent-free, is more preferable from the viewpoint of environment and health, and does not require a photopolymerization initiator and can provide stable curing characteristics.

  Moreover, various additives can be mix | blended with the curable resin composition which comprises a surface protective layer according to the desired physical property of the cured resin layer obtained. Examples of this additive include a weather resistance improver, an abrasion resistance improver, a polymerization inhibitor, a crosslinking agent, an infrared absorber, an antistatic agent, an adhesion improver, a leveling agent, a thixotropic agent, a coupling agent, A plasticizer, an antifoamer, a filler, a solvent, a coloring agent, etc. are mentioned.

In order to coat the surface protective layer, the polymerizable monomer, polymerizable oligomer and various additives, which are the above-mentioned curing components, are uniformly mixed in predetermined ratios, respectively, and a coating solution comprising a curable resin composition To prepare. The viscosity of the coating solution is not particularly limited as long as it is a viscosity capable of forming an uncured resin layer on the surface of the substrate by a coating method described later.
In the present invention, the coating liquid prepared in this manner is applied to the surface of the substrate so that the thickness after curing is about 3 to 10 μm, such as gravure coating, bar coating, roll coating, reverse roll coating. The uncured resin layer is formed by coating by a known method such as comma coating, preferably by gravure coating.

In the present invention, the surface protective layer laminated as desired is to cure the uncured resin layer by applying heat to the uncured resin layer thus formed or irradiating it with ionizing radiation such as an electron beam or ultraviolet ray. Is formed.
The heating temperature in the case of thermosetting is appropriately determined according to the resin used. Moreover, when using an electron beam as ionizing radiation, although the acceleration voltage can be suitably selected according to the resin to be used or the thickness of the layer, it is preferable to cure the uncured resin layer at an acceleration voltage of about 70 to 300 kV. .
In electron beam irradiation, the transmission capability increases as the acceleration voltage increases. Therefore, when using a base material that deteriorates due to the electron beam as the base material, the transmission depth of the electron beam and the thickness of the resin layer are substantially equal. By selecting the accelerating voltage so as to be equal to each other, it is possible to suppress the irradiation of the electron beam to the base material, and to minimize the deterioration of the base material due to the excessive electron beam.
The irradiation dose is preferably such that the crosslink density of the resin layer is saturated, and is usually selected in the range of 5 to 300 kGy (0.5 to 30 Mrad), preferably 10 to 50 kGy (1 to 5 Mrad).
Further, the electron beam source is not particularly limited. For example, various electron beam accelerators such as a cockroft Walton type, a bandegraft type, a resonant transformer type, an insulated core transformer type, a linear type, a dynamitron type, a high frequency type, etc. Can be used.
When ultraviolet rays are used as the ionizing radiation, those containing ultraviolet rays having a wavelength of 190 to 380 nm are emitted. There is no restriction | limiting in particular as an ultraviolet-ray source, For example, a high pressure mercury lamp, a low pressure mercury lamp, a metal halide lamp, a carbon arc lamp, etc. are used.
The cured resin layer thus formed has various functions by adding various additives, for example, a so-called hard coat function, anti-fogging coat function, and anti-fouling coat having high hardness and scratch resistance. A function, an antiglare coating function, an antireflection coating function, an ultraviolet shielding coating function, an infrared shielding coating function, and the like can also be imparted.

The decorative sheet 3 according to the present invention may be provided with a pattern layer composed of a solid ink layer and / or a pattern ink layer as desired. When a doubling sheet is used as the decorative sheet 3, the resin layer A, the solid ink layer, the pattern ink layer, the resin layer B, and the surface protective layer are laminated in this order.
The solid ink layer is usually provided as desired for the purpose of improving the design of the decorative sheet, and is also referred to as a concealing layer. The solid ink layer adjusts the color of the surface of the resin layer A, and is formed when the resin layer A itself is colored or uneven in color, and gives the intended color to the surface of the resin layer A. Usually, it is formed with an opaque color, but it may be formed with a colored transparent color to make use of the pattern of the base. When making use of the fact that the resin layer A is white or when the resin layer A itself is appropriately colored, it is not necessary to form a solid ink layer.

As the ink used for forming the solid ink layer, an ink in which a binder, a colorant such as a pigment or a dye, an extender pigment, a solvent, a stabilizer, a plasticizer, a catalyst, or a curing agent is appropriately mixed is used. The binder is not particularly limited, and examples thereof include polyurethane resins, vinyl chloride / vinyl acetate copolymer resins, vinyl chloride / vinyl acetate / acrylic copolymer resins, chlorinated polypropylene resins, acrylic resins, and polyesters. Arbitrary resins, polyamide resins, butyral resins, polystyrene resins, nitrocellulose resins, cellulose acetate resins and the like may be used alone or in admixture of two or more.
Colorants include carbon black (black), iron black, titanium white, antimony white, yellow lead, titanium yellow, petal, cadmium red, ultramarine, cobalt blue and other inorganic pigments, quinacridone red, isoindolinone yellow, phthalocyanine Organic pigments or dyes such as blue, metallic pigments composed of scaly foil pieces such as aluminum and brass, pearlescent pigments composed of scaly foil pieces such as titanium dioxide-coated mica and basic lead carbonate, and the like are used. The thickness of the solid ink layer is usually about 1 to 20 μm.

The pattern ink layer gives decorativeness to the decorative sheet, and is formed by printing various patterns using ink and a printing machine. The patterns include wood grain patterns, marble patterns such as marble patterns (for example, travertine marble patterns), stone patterns simulating the surface of rocks, fabric patterns simulating cloth and cloth patterns, tiled patterns, brickwork patterns, ripple patterns, There are geometric patterns, etc., and there are patterns such as parquets, patchwork, etc. that combine these, as well as letters, symbols, line drawings, and various abstract patterns.
These patterns can be formed by multicolor printing with normal yellow, red, blue, and black process colors, and also by multicolor printing with special colors prepared by preparing individual color plates that make up the pattern. Is done.
As the pattern ink used for the pattern ink layer, the same ink as that used for the solid ink layer can be used.
The thickness of the handle ink layer is usually about 1 to 5 μm.

  The transparent resin layer B in the case of using a doubling sheet as the decorative sheet 3 according to the present invention can be suitably formed from, for example, a transparent thermoplastic resin. The transparent resin layer protects the pattern layer and smoothes the irregularities generated by the pattern layer, thereby improving the adhesion between the resin layer A, the pattern layer, and the surface protective layer. Specific examples of the transparent thermoplastic resin include soft, semi-rigid or hard polyvinyl chloride, polyethylene terephthalate, polybutylene terephthalate, polyamide, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene- (meth) acrylic acid. Examples include copolymers, ethylene- (meth) acrylic acid ester copolymers, ionomers, poly (meth) acrylic acid esters, and the like.

The transparent thermoplastic resin may be colored, and can be easily obtained, for example, by adding a colorant to the thermoplastic resin. In addition, as a coloring agent, the coloring agent used with the said pattern layer can be used.
In addition, for the transparent resin layer B, softening of fillers, matting agents, foaming agents, flame retardants, lubricants, antistatic agents, antioxidants, ultraviolet absorbers, light stabilizers, radical scavengers, rubber, etc. Additives such as ingredients can be added.

  When the decorative sheet is a doubling sheet, suitable combinations of the resin layer A and the resin layer B include various combinations of polyethylene-polyethylene, polyethylene-polypropylene, polypropylene-polyethylene, and polypropylene-polypropylene. Can be used.

  The lamination | stacking of each layer in the decorative sheet 3 which concerns on this invention can use the method normally used for the manufacturing method of a decorative sheet. For example, after forming a pattern layer (solid ink layer and pattern ink layer) on one side of the resin layer A by sequential printing, via a known dry lamination adhesive such as a two-component curable urethane resin on the pattern layer, The transparent resin layer B can be laminated by a dry lamination method, a T-die extrusion method, or the like, and further a method for forming a surface protective layer.

  Since the decorative board 1 of the present invention covers the surface and side surfaces of the base material with a single decorative sheet, the design is high, and not only the surface but also part of the side and back surfaces are covered with a waterproof sheet. Therefore, the base material is not swollen. That is, the decorative board 1 of the present invention is a thin decorative board that is excellent in waterproofness and moisture resistance, has high design properties, and is thin.

EXAMPLES Next, although an Example demonstrates this invention further in detail, this invention is not limited at all by this example.
Example 1
(1) Moisture-curing urethane sealer (UC Sealer W-009N manufactured by Dainippon Ink & Chemicals, Inc.) on the front and back surfaces of a 6 mm thick calcium silicate plate (3 × 6 scale) with a specific gravity of 1.0 using a sponge roll (Solid content) 20 g / m ^{2 was} applied and dried to obtain a substrate.
(2) Further, after applying a urethane-based easy-adhesion coat to the back surface of a 0.08 mm thick polyethylene-based colored sheet, the surface was subjected to woodgrain printing by gravure printing with an acrylic urethane-based ink. A polyester adhesive was further applied to the surface of the colored sheet, a polypropylene transparent resin having a thickness of 0.06 mm was extruded with a T die, and then laminated to form a transparent resin layer. After applying a urethane primer to the surface of the transparent resin layer, a surface protective layer of an acrylate electron beam curable resin was formed, and a grain embossing process was performed on the surface to prepare an embossed decorative sheet having a total thickness of 150 μm.

(3) Next, after the base material prepared in (1) is cut into a 50 cm square size, the adhesive a is applied to the surface of the 50 cm square base material with a roll coater, and then the olefin resin (polypropylene) sheet is slit by 60 cm. After laminating with a press roll, sheets were left in front and back by 5 cm, and left for 1 hour by applying a pressure of 50 kg / m 2 with a cold press. Then, it was left for one day.
Adhesive a: Ethylene / vinyl acetate copolymer adhesive (manufactured by Chuo Rika Kogyo Co., Ltd., BA-10)
Isocyanate-based curing agent (manufactured by Chuo Rika Kogyo Co., Ltd., BA 11B) 2.5 parts formulation Adhesive coating amount 30 g / m ² (solid content)
(4) Thereafter, the winding width of the back surface of the base material was set to 20 mm, and the decorative sheet was cut around the base material while leaving a sheet blank portion having a width of 26 mm. Next, a punching die was prepared in advance to punch out unnecessary portions of the corner portion of the decorative sheet blank portion. The punching die was a Thomson die, the die shape was a right angle of 15 mm, and the subsequent 11 mm portion was an oblique cut of 45 °.

(5) A spiral spray coat gun is installed as a coat head on the table, the base material fixing device, the one-axis robot set beside the table, and the movable stage installed on the one-axis robot. A device in which 8 rolls that can be wrapped were installed was created. At this time, the spiral spray coat gun is aligned at a linear distance of 40 mm at a position 7 mm from the end with irradiation of 45 ° with respect to the substrate installation position. It was set so that it could be applied.

(6) Thereafter, the substrate is reversed, the substrate is set at the above-mentioned substrate installation position, and after fixing, as shown in FIG. 1, hot melt adhesive b is applied from the end of the substrate with a spiral spray coat gun. The entire side surface and a part of the back surface of the base material were coated, the hot melt application was stopped at the base material edge, and the wrapping roll was continuously passed through to wrap around one side.
Hot melt adhesive b: Olefin rubber hot melt (Hitachi Chemical Polymer Co., Ltd., Hibon 9646), softening point 130 ° C., coating viscosity: 6000 MPa · s (180 ° C.)
Adhesive melter: Nordson Co., Ltd., HM-3102V
Coat gun: CF201 HAM gun Nozzle: UNI. 018, hole diameter 0.46mm
Adhesive heating temperature: 180 ° C Hot air: 190 ° C
Adhesive application pressure: 0.15 MPa Hot air pressure: 0.2 MPa
Adhesive application amount: 100 g / m ²
Lamination speed: 10 m / min (7) After winding one side, fixing was removed, and the same processing was performed on the next side. The same processing was repeated to complete the winding of all the side surfaces (4 sides) of the substrate, and a four-sided decorative board was obtained.
The amount of hot melt adhesive applied at this time was determined by applying a transparent polyester film having a thickness of 25 μm to the side and back of the substrate with a double-sided tape, and applying the same conditions. The coating amount, the coating width, and the adhesion state of the side and back surfaces of the substrate were confirmed.
Further, the application amount distribution in the width direction of the hot melt adhesive was divided into five equal parts, and the application amount of each part was measured.
When 100 g / m ^{2 is} applied, the coating width is 25 mm, and the coating amount distribution divided into 5 equal parts in the width direction is as follows: side part: 30 g / m ² , central part 1: 14.3 g / m ² , central part 2 ( most central): 12.5g / m ^2, the central portion 3: 14.0g / m ^2, side: was 29.2 g / m ^2. That is, the coating amount on both sides was 59.2 g / m ² , and the coating amount on the center portion was 40.8 g / m ² .
Further, (the coating amount on both sides / the coating amount on the center) was 1.45, and (the average coating density on both sides / the average coating density on the center) was 2.2.
When the obtained decorative board was observed, there was no floating of the decorative sheet on the side surface of the base material after entrainment, and sufficient peel strength between the base material and the decorative sheet was obtained. In addition, factory production is possible without using a tack sheet, greatly improving productivity.

Examples 2-6
As shown in Table 1, a decorative board was produced in the same manner as in Example 1 except that the amount of adhesive applied over the entire coating width was changed. The relationship between the sheet lift and the check for the presence of wobbling and the peel strength on the back of the substrate was evaluated. The peel strength on the back surface of the substrate preferably has a peel strength of 0.8 Kgf / inch or more, in order to prevent peeling due to rubbing or the like of the decorative board in the distribution stage, and has a peel strength of 1 Kgf / inch or more. More preferably, it has.

第１表に示す評価結果から、接着剤の塗布量が、塗布巾全体で５０〜２００ｇ／ｍ²であることが好ましいと判明した。

From the evaluation results shown in Table 1, it was found that the adhesive application amount was preferably 50 to 200 g / m ^{2 over the} entire application width.

Comparative Example 1
The back surface of the decorative sheet prepared in Example 1 was coated with 40 g / m ² of acrylic adhesive on release paper and laminated to prepare a tack sheet.
In the same manner as in Example 1, the surface was sealed with a specific gravity of 1.0 mm, and a 6 mm thick calcium silicate plate (3 × 6 scale) base material was laminated by hand while pressing the tack sheet.
Thereafter, the winding width of the back surface of the base material was 20 mm, and the decorative sheet was cut with a ruler and a cutter around the base material, leaving a sheet blank portion with a width of 26 mm. Next, the unnecessary part of the corner part of the decorative sheet blank part was excised manually with a cutter.
Further, the side and back surfaces of the base material were laminated manually.
The entire surface floated on the side of the substrate. The peel strength on the back surface was 0.5 kgf / inch, which was insufficient. Moreover, it was a manual operation and the productivity was very low.

Comparative Example 2
The decorative sheet prepared in Example 1 was laminated on the surface of the base material in the same manner as in Comparative Example 1 using the same base material as in Comparative Example 1, and the side and back surfaces of the base material were rolled up. However, before laminating, the following rubber-based sealer was applied with a brush to the entrainment portions on the side surface and the back surface of the substrate and dried.
Synthetic rubber sealer “WP-2000” manufactured by Sumitomo 3M Limited
There was no side lift of the substrate. The peel strength on the back surface was 2 kgf / inch. However, it was manual work and the productivity was very low.

Comparative Example 3
As in Example 1, a water-based adhesive was applied to the substrate surface, and the decorative sheet prepared in Example 1 was laminated and pressure-cured.
The following double-sided adhesive tape was affixed to the margin part of the decorative sheet, and then the width of the back of the base material was 20 mm, and the decorative sheet was cut with a ruler and a cutter around the base material leaving a 26 mm wide decorative sheet margin part. . Next, the unnecessary part of the corner part of the decorative sheet blank part was excised manually with a cutter.
Made by Sekisui Chemical Co., Ltd., acrylic resin adhesive tape “Double Tack Tape # 570”
The side and back surfaces of the substrate were laminated manually.
Partial lift occurred on the side of the substrate. The peel strength on the back surface was 0.7 kgf / inch, which was slightly insufficient. Moreover, it was a manual operation and the productivity was very low.

Comparative Example 4
Although it was the same as that of the comparative example 3, before laminating, the rubber-type sealer was apply | coated to the winding part of the side surface and back surface of a base material with the brush, and it was made to dry.
Synthetic rubber sealer “WP-2000” manufactured by Sumitomo 3M Limited
Similarly, the decorative sheet lamination on the surface of the base material and the side surface and the back surface of the base material are involved in the base material.
There was no float on the side of the substrate. The peel strength on the back surface was 2.2 kgf / inch. However, it was manual work and the productivity was very low.

  The decorative board according to the present invention is a decorative board that can greatly improve the productivity by using an adhesive work method that does not use a tack sheet, and that does not require manual labor, and that is capable of greatly improving productivity through equipment work. As a decorative plate such as a four-sided roll provided, it is suitably used to enhance the aesthetics of the walls of buildings, hotels, condominiums, conference rooms, and offices.

It is a figure which shows an example of application | coating of the adhesive agent to a part of side surface and back surface of the base material in the decorative board of this invention. It is a figure showing the locus of application at the time of applying adhesives on a plane by spiral spray coat in the present invention.

Explanation of symbols

1. Decorative plate Substrate 2a. Side surface of substrate 2b. 2. Back side of substrate Cosmetic sheet 4. Coat head

Claims (8)

  Adhesion of the side surface and the back surface of the porous non-combustible base material, at least one side surface of all the side surfaces, and a decorative plate in which the decorative sheet is wound around a part of the back surface The coating width of the agent is composed of both sides of the outer 20% range when the coating width is divided into 5 equal parts, and a central portion other than the both sides, and the coating amount of the both sides is the coating amount of the central portion. More than the amount, and one of the both side portions is disposed on a side surface of the base material, and the other of the both side portions is disposed at an end portion of the decorative sheet winding portion on the back surface of the base material. Decorative board.   The decorative board according to claim 1, wherein the coating amount on both side portions is 1.3 times or more of the coating amount on the central portion.   The decorative board according to claim 1 or 2, wherein the adhesive is a hot melt adhesive or a reactive hot melt adhesive. The coating amount of the adhesive, decorative plate according to claim 1 for the entire coating width is 50 to 200 g / m ^2.   The decorative board according to any one of claims 1 to 4, wherein the adhesive is applied in a non-contact manner.   The decorative board according to claim 5, wherein the adhesive is applied by spiral spray coating.   The decorative board according to claim 6, wherein a diameter of the nozzle of the spiral spray coat is 0.5 mm or less.   The decorative board according to any one of claims 1 to 7, wherein a hot melt adhesive or a reactive hot melt adhesive is applied to the side surface of the base material by spiral spray coating without performing a sealer treatment.

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