JPS5949909B2 - Manufacturing method of thin decorative paper adhesive decorative board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a decorative board, and an object thereof is to provide a decorative board with thin line decorative paper that is not easily affected by the color of the substrate and in which the color tone of the decorative paper can be clearly seen. There is a particular thing.

Conventional decorative boards are manufactured by pasting thin decorative paper of about 15 to 35 y/m2 onto the surface of a substrate such as plywood using an adhesive containing titanium white or the like.

Rawano plywood, which is the most common board, has a unique color tone, and is generally classified into three types: white, red, and yellow. If decorative paper is attached to the surface of plywood of different colors using a vinyl acetate resin adhesive that has a transparent film, the color tone of the plywood will appear on the surface through the decorative paper. For example, if white and red plywood are the same, When decorative boards with decorative paper pasted are installed side by side, the color of the red plywood decorative boards becomes dull and looks like completely different colored decorative boards, and cannot be sold as the same product.

Therefore, in the past, in order to prevent even the slightest difference in the color of these decorative plywoods, the color tone of the plywood used was limited to one, or coloring agents such as titanium white, black, or red were added to the adhesive. . However, it has become impossible to limit the color tone of the plywood used due to the deterioration of the raw wood situation and rising prices. On the other hand, the most common method is to add titanium white to the adhesive, but because white colorants are inherently less effective at hiding the color of the substrate than black colorants, a large amount of a special type of titanium white is added. Without it, there will be little effect.

However, the amount of titanium white added to the synthetic resin content of the adhesive is 1
If the weight exceeds 0, the adhesion to the decorative paper will be significantly reduced, so there are limits to the amount added and the hiding performance, which is not necessarily satisfactory. The black coloring agent hides the substrate color well, and for example, as shown in the drawing, there is an adhesive that has 3.0% by weight of titanium white and 0.1% of carbon added to the synthetic resin component of the adhesive, and an adhesive that has only titanium white added. Adhesive added at 5.0% by weight has almost the same hiding effect. However, the color of a decorative board made by pasting decorative paper on the surface of a board coated with a black adhesive darkens, creating a subdued appearance and diminishing the color of the printing ink, resulting in a decorative board with low commercial value. Therefore, the present invention examines and solves these problems. That is, the present invention is a method for manufacturing a decorative board in which a decorative thin paper is attached to the upper surface of a regular substrate via an adhesive, and the adhesive for pasting the decorative thin paper and the regular substrate has a hiding rate on a test paper of JISK-5400. This invention relates to a method for producing a decorative board with thin decorative paper, which is characterized by adding white and yellow colorants so that the black surface has a diffuse reflectance of 45% and 0 degrees of 40% or more, and its summary The points are as follows: 1. If the obscuring rate of the adhesive is 50% or more, the color tone of the board will be almost hidden, causing a practical problem for decorative boards with thin paper (approximately 15 to 35 f7/i") pasted with decorative paper. Prevent color differences.

2. When the black surface of the adhesive has a 45 degree and 0 degree diffuse reflectance of 40% or more, the coloring of the thin decorative paper attached to the substrate surface becomes natural and prevents the color from sinking or darkening.

There are two points.

The method of testing the opacity and the diffuse reflectance of black surfaces at 45 degrees and 0 degrees in the present invention is measured under the following conditions in accordance with the method specified in JISK-5400-1970.

1 test equipment Digital angle gloss meter 2 samples created Mount paper Hidden pay rate test paper (Japan Test Panel Co., Ltd.) Application amount 0.2i (Wet) Drying conditions 60 (C open dryer Leave for 20 minutes 3 Measurement method 1) Adjust the equipment using a standard board (white board).

2) For the 45 degree and 0 degree diffuse reflectance of black and white surfaces, measure the reflectance by uniformly applying a predetermined amount of colored adhesive on the black and white surfaces of the opacity test paper, drying it, and holding it horizontally. Using a device, the reflectance of the black and white surfaces of the test paper is measured with the incident angle from the light source being 45 degrees and the reflection angle being 0 degrees.

4. As the calculation board, commonly used boards such as plywood, verteckle board, hardboard, gypsum board, pulp cladding board, asbestos slate, and metal plate can be used.

As thin paper decorative paper, unprinted thin paper weighing about 15 to 351 x 2, or decorative paper with various patterns or single color printing applied to the surface of the thin paper and further coated with transparent paint on the surface of the pattern, etc., is used.

Adhesives include commonly used vinyl acetate resin emulsion adhesives, ethylene vinyl acetate copolymer resins, acrylic vinyl acetate copolymer resin emulsion adhesives, latex emulsion adhesives, etc., or these adhesives can be combined with urea, melamine resins, etc. A small amount (approximately 20% by weight or less) of a water-soluble thermosetting synthetic resin adhesive is used. White colorants added to the adhesive include commonly used rutile type and anatase type titanium white, and yellow colorants include commonly used yellow iron oxide, titanium yellow, yellow lead, and organic yellow colorants.

The hiding rate of the adhesive according to JISK-5400 is 50% or more, and the black surface has a 45° 10° diffuse reflectance of 40%.
As an example of the above colorant formulation, for example, it is possible to add 4% or more of titanium white to the synthetic resin content of the adhesive, but if the amount added is 10% or more, the adhesive strength will be extremely reduced. The addition range must be limited to 4 to 10% by weight.

Therefore, it was experimentally found that by adding a yellow colorant to the above-mentioned adhesive, it was possible to improve only the hiding rate without reducing the black surface 45 degree, 0 degree diffuse reflectance and adhesive performance of the adhesive. In other words, as shown in the drawing, for example, if only 0.5% by weight of a yellow colorant is added to the synthetic resin content of the adhesive, the specific damage coverage will be improved by about 10% when only titanium white is added. It has become possible to reduce the amount of titanium white added and further improve the hiding rate of conventional adhesives.

The amount of yellow colorant added is 0.1 based on the synthetic resin content of the adhesive.
The amount added is preferably from a small amount of about 3% by weight to about 3% by weight, and if the amount added is more than 3% by weight, the hiding effect will not improve much.

In addition, the more colorants other than yellow, such as red colorants, are added to the adhesive, as shown in the drawing, the more they are added to the adhesive, the more the black surface diffuse reflectance decreases, making the color tone of the decorative board undesirable. . Next, examples of the present invention will be described.

Example 1 Adhesives having the following formulation were applied to the surfaces of white plywood, yellow plywood, and pink plywood with a thickness of 2.7 Wf1 by 75 to 801 people.

/1? Layer unprinted thin paper weighing 30V/M2 on the surface of the board and press it with a press roll to obtain 3 sheets of decorative plywood.The top surface of the plywood is coated with 90~95y/M2 of I-Poly color enamel paint to create 3 single-color sheets. I got decorative plywood.

Three sheets of single-colored decorative plywood were lined up on one plane and the colors were vivid, the color differences were not noticeable, and the adhesive strength was good.

The opacity and the 45 degree black surface and 0 degree diffuse reflectance of the adhesive having the above composition were measured on a test paper based on JISK-5400, and the results were approximately 75% and 45%, respectively.

Example 2 Thickness 2.5? An adhesive having the following composition was applied to the surfaces of white plywood, yellow plywood, and red plywood at a rate of IO to 751 minutes.

Vinyl acetate resin emulsion adhesive (resin ratio 50%) After semi-drying by blowing hot air onto the adhesive coated surface, overlay a decorative paper weighing 23,/M2 with a pine board pattern and a transparent topcoat on the surface. Three sheets of printed plywood were obtained by pressure bonding using a press roll.

Three sheets of printed plywood were installed on one plane, and the wood grain pattern was vivid, the color difference was inconspicuous, and the adhesive strength was good.

The opacity and the black surface 45° and 0° diffuse reflectance of the adhesive having the above composition were measured on a test paper according to JISK-5400, and the results were about 80 tfh and 50%, respectively.

Example 3 An adhesive having the following composition was coated on the surface of white, yellow, and pink plywood with a thickness of 100 to 1101 cm.

r Ethylene-vinyl acetate copolymer resin emulsion adhesive (11) After semi-drying by blowing hot air onto the adhesive-coated surface, overlay a piece of decorative paper with a floral pattern weighing 35,000 yen on the surface and press at a temperature of 110 with a flat plate press. C., a pressure of 5 kg/I, and a time of 60 seconds to obtain three pieces of printed plywood.

A transparent top coat was applied to the top surface and dried, and three sheets of printed plywood were lined up on one plane and the floral pattern was vivid, the color difference was inconspicuous, and the adhesion was good. The opacity and black surface 45° and 0° diffusion reversal ratios of the adhesive having the above composition were measured on a test paper according to JISK-5400, and the results were 75% and 50%, respectively.

As described above, according to the present invention, by adding titanium white and a small amount of yellow coloring agent to the adhesive, the printed color of the thin decorative paper can be depressed or darkened without reducing the adhesive strength of the adhesive. Since it effectively hides the color tone of the board without causing any damage, it eliminates the hassle of sorting the board and sorting the rods according to the different colors of the decorative board, improving production efficiency and producing prints with vivid printed patterns and high commercial value. You will get plywood.

Moreover, since the hiding effect of expensive titanium white can be replaced with a small amount of yellow colorant, it also has the economical effect of lowering the price of the adhesive.

[Brief explanation of drawings]

The figure is a graph showing the relationship between the opacity and the black surface 45 degree, o degree diffuse reflectance when coloring agents of various colors are added to the adhesive. In the figure, T: titanium white, Y: yellow colorant, R: red colorant,
B: Indicates a black colorant, and the appended numerical value indicates the amount (% by weight) added to the synthetic resin component of the adhesive.

Claims (1)

[Claims] 1. In a method for manufacturing decorative boards in which thin paper decorative paper is attached to the upper surface of a regular substrate via an adhesive, the adhesive used to attach the thin paper decorative paper and the regular substrate is tested so that the opacity on a test paper based on JIS K-5400 is A method for producing a decorative thin paper-adhered decorative board, characterized by adding white and yellow colorants so that the black surface has a 45 degree and 0 degree diffuse reflectance of 40% or more.