JP3237284B2 - Manufacturing method of decorative paper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing decorative paper used for decorative boards used for furniture, household equipment, etc., and more particularly, to a high-quality decorative board which has excellent durability such as abrasion resistance on the surface and can be used on a horizontal surface. It is intended to provide a production method for efficiently producing a decorative paper for obtaining the same.

[0002]

2. Description of the Related Art Conventionally, decorative boards used for horizontal surfaces such as furniture and home appliances are printed on paper having excellent permeability such as titanium paper and then cured with thermosetting resin such as melamine resin and diallyl phthalate resin. A resin-impregnated paper made by impregnating a resin is placed on a base material such as phenol core paper or particle board, and heated and pressed via a mirror plate to produce the paper. According to this method, a decorative plate having surface hardness and abrasion resistance required for a horizontal surface can be obtained, but on the other hand, it has to be expensive because of poor production efficiency.

In order to improve the cost, various means have been studied to apply an electron beam-curable resin from the surface without impregnating with a thermosetting resin, to penetrate the paper layer, and to strengthen it. Satisfaction has not been obtained for some reason. In other words, the resin applied from the surface penetrates into the paper layer, but if the viscosity of the resin is reduced with emphasis on permeability, the amount of resin remaining on the surface will decrease, so the surface finish of the decorative paper will deteriorate, and conversely, the surface finish If the viscosity of the resin is increased in order to limit the permeation of the resin with emphasis on the feeling, the permeation into the paper layer is reduced, so that the original purpose of strengthening the paper layer cannot be achieved.

[0004] In addition, in the method of applying two types of resin, a low-viscosity resin and a high-viscosity resin, to be applied from the surface, a high-viscosity resin is applied while the previously applied low-viscosity resin is not dried. At the stage of applying the high-viscosity resin, there arise problems such as a blurred pattern and an uneven finish.

According to the method in which the previously applied resin is cured once and then the subsequent resin is applied, the finished feeling is good, but the first layer of resin is cured to form an interface. The problem that the resin of the second layer causes interfacial peeling was inevitable.

[0006] Further, depending on the compounding material of the electron beam-curable resin, it is often observed that if the resin penetrates and cures on the back surface of the paper layer, adhesion to the base material is difficult.

On the other hand, conventionally, a method of manufacturing a decorative board mainly used for a facing material of furniture, etc., according to a so-called quick step method, in which an aqueous adhesive is applied to the surface of a base material, while an aqueous adhesive is applied to the back of decorative paper. Applying an adhesive, bonding, and pressing with a press machine to produce a decorative board,
At present, only the urethane resin or the like is coated on the surface of the decorative paper, the reinforcement of the paper layer is insufficient, and it cannot be said that the paper has the abrasion resistance and surface hardness required for horizontal surfaces.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a wear resistance and a surface hardness which can be used on a horizontal surface. The object of the present invention is to provide a method for producing decorative paper having excellent surface performance in order to obtain a high-quality decorative board extremely efficiently and at low cost.

[0009]

According to the present invention, a printing layer containing a small amount of an electron beam-curable resin is provided on one side of paper having excellent resin permeability, and the other side is provided. After providing a back coat layer containing a small amount of electron beam-curable resin, apply the electron beam-curable resin on the print layer and irradiate with electron beams while penetrating the paper to cure the electron beam. Provided is a method for producing decorative paper, which is obtained by curing a mold resin.

Hereinafter, the present invention will be described in detail. Paper having good resin permeability has a basis weight of 50 to 120 g / m ^2.
Base paper for decorative paper such as titanium paper is preferred. Either the surface to be printed or the surface to be coated on the back side may be used, but it is generally preferable to print a pattern on a smooth surface because the printing effect is excellent.

The printing layer is formed by a known method such as a gravure printing method, and the binder of the ink is mainly a solvent-type or aqueous-type resin which is thermally dried. When adding a small amount of the electron beam-curable resin, the addition amount is set such that continuous printing can be performed by thermal drying.

The back coat layer is coated by a known method such as a gravure coating method like the print layer. As resin,
In consideration of stopping the penetration of the electron beam-curable resin into the paper layer and having good adhesiveness when bonding with the base material via an adhesive, etc., select a resin that is heat-dried in a solvent type or aqueous type. I do. When adding a small amount of the electron beam-curable resin, the addition amount is such that it can be continuously coated by thermal drying.

The electron beam-curable resin when added to a printing ink or a back coat includes (meth) acrylate oligomers such as urethane acrylate, polyester acrylate, epoxy acrylate and the like, emulsions thereof, and monofunctional or polyfunctional monomers. It can be appropriately selected from a simple substance such as a monomer or a mixture.

The electron beam curable resin on the print layer may be applied by a known coating method such as a roll coating method and a knife coating method. The electron beam-curable resin used in the present invention is not particularly limited, but may be a monofunctional or polyfunctional monomer, a slip or the like, on a (meth) acrylate oligomer such as urethane acrylate, polyester acrylate, epoxy acrylate, or silicon acrylate. It is preferable that the viscosity is adjusted to several tens to several hundreds cps by blending additives such as an agent and a matting agent in consideration of the permeability with the paper layer.

Regarding the irradiation of the electron beam, the acceleration voltage of the electron beam is preferably 200 to 250 Kv, and the irradiation amount is preferably about 3 to 5 Mrad. By this treatment, decorative paper having excellent interlayer strength and surface strength can be obtained. Usually this process is 50-150m
/ Min line speed is possible, resulting in extremely high production efficiency.

Irradiation of the electron beam is usually performed from the side coated with the electron beam-curable resin, but the surface coated with the electron beam-curable resin is pressed against a metal roll having a smooth surface to press the back side of the paper. By irradiating with more electron beams and curing, a mirror surface such as a thermosetting resin decorative plate through a mirror plate can be efficiently obtained.

Further, by using a metal roll having fine irregularities instead of a smooth metal roll, decorative paper having a uniform matte surface can be efficiently obtained, and irregularities are formed in a pattern. By using a metal roll,
It is possible to obtain a decorative paper on which a sharp uneven pattern is formed.

[0018]

As described above, according to the present invention, the electron beam-curable resin penetrates the paper with a relatively low viscosity, but because of the back coat layer, does not penetrate the paper layer more than necessary. Can be left on the surface.

Further, the printing / backside coating is only dried so that continuous printing and continuous coating can be performed. Since the electron beam is irradiated with the electron beam curable resin on the front side after application, it is cured at the final stage. The production can be performed by an integrated line, and a small amount of the electron beam-curable resin and the layer of the electron beam-curable resin contained in each layer are integrated and cured.

[0020]

Example: 80 g / m2 basis weight as paper with excellent resin permeability
^Using white base paper for decorative paper of No. ² , a back coat consisting of 30 parts by weight of an acrylic resin on the back side of the paper, 5 parts by weight of a bifunctional monomer, and 65 parts by weight of water was used.
g / m ² . Next, on the front side of the paper,
15-30 parts by weight of acrylic resin as ink for printing layer,
5 to 30 parts by weight of a coloring pigment, 3 to 12 parts by weight of a bifunctional monomer, 100 parts by weight of the whole, and the rest made of water (the ratio varies depending on the color), and a stone-like pattern is printed using this. Dried. Subsequently, an electron beam curable resin adjusted to a viscosity of 200 cps (70 parts by weight of “Evecryl 810” manufactured by Daicel UCB Co., Ltd./3 trifunctional monomer 28)
(Parts by weight / 2 parts by weight of slip agent) is applied at 60 g / m ² ,
The coated surface is pressed against a metal roll having a stone-like unevenness formed on the surface, and an electron beam is irradiated from the back side of the paper by an electron beam irradiation device at an acceleration voltage of 250 Kv and 5 Mrad to cure the electron beam. Was cured to obtain a decorative paper.

When this was bonded to a particle board with a urea / vinyl acetate adhesive to form a decorative board, the appearance was extremely excellent due to the stone-like uneven shape and printed pattern, and the interlayer strength and surface strength were very excellent. (Abrasion test JAS B test passed), and a decorative board with sufficient performance even on a horizontal surface was obtained.

[0022]

According to the present invention, the surface of the decorative paper has an electron beam-curable resin layer for protecting the surface, which penetrates well to the lower part of the paper layer of the printing paper and strengthens the space between the papers, while the lower part of the paper layer contacts the back coat layer. In addition, since the resin does not penetrate more than necessary, the amount of resin on the surface is secured, and the finished appearance of the surface is excellent. Since the electron beam curable resin does not strike through on the back surface of the decorative paper, the adhesiveness to the base material by the adhesive is excellent.

Further, these electron beam-curable resins are cured and integrated by only one irradiation of the electron beam, so that there is no weak layer anywhere in the decorative paper layer, and decorative paper having extremely high strength can be manufactured. , The production efficiency is also very high. It is easy to produce in one step at the same time as printing.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) D21H 11/00-27/42 B32B 1/00-35/00

Claims (1)

(57) [Claims] 1. A back coat layer comprising a printed layer containing a small amount of an electron beam-curable resin on one side of paper having excellent resin permeability and a small amount of an electron beam-curable resin on the other side. Is provided by applying an electron beam-curable resin on the print layer and irradiating the paper with an electron beam while penetrating the paper, thereby curing the electron beam-curable resin. Paper manufacturing method.