JP2000096486A - Raw material paper for decorative plate and production thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a raw material paper for a decorative plate excellent in printing adoptability and interlaminar peeling strength by impregnating a thermoplastic resin emulsion into a raw paper made by a paper making process and incorporated with a specific amount of titanium dioxide and then performing a calendaring treatment. SOLUTION: This raw paper for a decorative plate is obtained by impregnating an emulsion of a thermoplastic resin such as an acrylate, etc., to a raw paper made by a paper making process and incorporated with 5-10 wt.% titanium dioxide, and then performing a smoothing treatment with a calendaring machine to form a raw material paper for a smoothed decorative plate having 0.7-0.8 g/cm3 density.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The decorative board base paper of the present invention is used for decorative boards used for building materials such as doors, door frames, window frames, etc., and for members such as learning desks, TV stands, bookcases, and doors of system kitchens. You.

[0002]

2. Description of the Related Art Conventionally, decorative boards have been used for plywood, particle boards, and the like.
A so-called PVC decorative board in which a PVC film is stuck on the surface of a wood-based base material such as metal or MDF via an adhesive has been mainly used. This is because the PVC film is excellent in design and workability. Specifically, after a printing layer is formed on a semi-rigid PVC film having coloring and shielding properties, a transparent semi-rigid PVC film is heated on this printing layer by heating laminating.
A decorative board has been obtained by laminating a so-called doubling PVC film for embossing the surface of a transparent PVC film and embossing a transparent PVC film surface, or a wiping PVC film in which ink is embedded in embossed concave portions, to a wooden base material via an adhesive. However, in recent years, PVC film has become an industrial waste disposal problem (dioxin and hydrogen chloride are generated during combustion).
Environmental issues, etc., the demand for not using PVC film from the point of view of product images is emerging,
There is a need for the development of alternative materials.

[0003] On the other hand, paper emits no toxic gas even when burned and is biodegradable, so there is no environmental problem. Moreover, since it is relatively inexpensive, decorative board base paper of a type mainly made of paper and impregnated and coated with a resin for imparting strength has been used.

[0004] Conventionally, as a base paper for decorative board of the above-mentioned type, a papermaking base paper containing 5 to 10% by weight of titanium dioxide is used as a paper before resin impregnation. This papermaking base paper is
In order to maintain the resin absorptivity required for the subsequent resin impregnation treatment, the density of the papermaking base paper tends to be set low, specifically, around 0.6 g / cm ^{3 in} many cases.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide an inexpensive veneer base paper having a lower resin impregnation amount than a conventional veneer base paper in obtaining a certain delamination strength of the veneer base paper. It is assumed that.

[0006]

Means for Solving the Problems The present inventor has taken the above problems into consideration.
As a result of intensive studies, the following invention has been attained. Immediately
That is, the present invention provides: Papermaking raw material with 5-10% by weight of titanium dioxide
Paper is impregnated with an emulsion thermoplastic resin and smoothed
The density of the papermaking base paper
Is 0.7 to 0.8 g / cm³Characterized by being
Decorative board base paper. 2. Papermaking raw material with 5-10% by weight of titanium dioxide
Paper is impregnated with an emulsion thermoplastic resin and smoothed
The method for producing decorative board base paper obtained by applying
Has a density of 0.7
~ 0.8g / cm ³Decorative board base paper characterized in that:
Manufacturing method. It is.

The titanium dioxide used in the present invention is 5-10.
The density of the base paper made by weight% is 0.7-0.8g
/ Cm ³ . If the density is less than 0.7 g / cm ³ ,
As in the test example (Comparative Example 1) described below, the delamination strength is inferior to that of the density within the specified range of the present invention (Example 1) even though the resin impregnation amount is constant. When the density exceeds 0.8 g / cm ³ , the resin absorbency required for the subsequent resin impregnation cannot be maintained, and uneven impregnation tends to occur.

[0008] The papermaking base paper used in the present invention can be produced by a roll-shaped calender generally used in the papermaking field such as a soft calender or a hard calender.

The type of the impregnating resin to be impregnated into the base paper is not particularly limited, and one or more resin emulsion mixed liquids selected from acrylic emulsions, vinyl acetate emulsions, and synthetic rubber latexes And the like. Acrylic is preferred from the viewpoint of light resistance. As the impregnation amount, a larger amount is preferable from the viewpoint of strength. However, the impregnation amount is usually 10 because the back surface loses its roughness, which affects the adhesiveness and deteriorates the blocking resistance.
To 40%.

After the resin impregnation, a smoothing treatment such as a super calendering is usually performed to improve printability to obtain a decorative base paper.

The obtained decorative board base paper is usually subjected to printing,
Further, urethane coat or the like is applied depending on the use. Further, it is pasted on a base material such as plywood, particle board, MDF, etc. via an adhesive to form a decorative board.

[0012]

The present invention will be described below with reference to examples. In addition, the following methods were used for the evaluation of the physical properties and characteristics of the decorative board base paper in the examples. Printability: Two-color woodgrain pattern printing was performed on a decorative board base paper using a gravure printing machine (Proofmaster manufactured by Sansei Seiki Co., Ltd.), and misdots were visually evaluated (5-grade evaluation; 5 is good). Interlaminar peel strength: According to JIS P-8139B method (T-type peeling). Cross cut: The decorative board base paper was printed with a wood grain pattern using a gravure printing machine, and a urethane-based resin was applied as a top coat at 2 g / m ² . Next, what was pasted on the plywood via an adhesive was subjected to a cross cut test. A cut is made in a grid pattern (100 frames) of 2 mm width, Nichiban cellophane tape is stuck, ironed with a certain force, and peeled off with a certain force. This was repeated 10 times, and the number of remaining frames out of 100 frames was counted to determine the quality. Impregnation unevenness: The appearance was visually evaluated.

EXAMPLE 1 95 parts of hardwood bleached kraft pulp (LBKP) and 5 parts of softwood bleached kraft pulp (NBKP) were beaten to a degree of 600 cc.
(CSF), and 10 parts of titanium dioxide and a papermaking aid were added to make 60 g / m ² base paper with a paper machine. A calendering process is applied during the papermaking process to obtain a density of 0.
A papermaking base paper of 71 g / cm ³ was obtained. The papermaking base paper was impregnated with an acrylic emulsion (Tg = -12 ° C.) to obtain an impregnated paper having a basis weight of 75 g / m ² . Further, the impregnated paper was subjected to a super calender treatment to obtain a decorative base paper. Table 1 shows the evaluation results of the obtained decorative board base paper.

Example 2 70 parts of hardwood bleached kraft pulp (LBKP) and 30 parts of softwood bleached kraft pulp (NBKP) were beaten at 600 cc.
(CSF), and 10 parts of titanium dioxide and a papermaking aid were added to form a paper using a paper machine equipped with 100 g / m ² base paper. Calendar in the paper making process - to obtain a paper making raw paper processing alms density 0.78 g / cm ^3. The papermaking base paper was impregnated with an acrylic emulsion (Tg = -12 ° C.) to obtain 120 g / m ² of impregnated paper. Further, the impregnated paper was subjected to a super calender treatment to obtain a decorative base paper.
Table 1 shows the evaluation results of the obtained decorative board base paper.

Comparative Example 1 100 parts of hardwood bleached kraft pulp (LBKP) was beaten.
Beat to 600 cc (CSF) and add titanium dioxide 1
0 parts, 60 g / m ²Base paper
Was made with a paper machine. Calendar processing during the papermaking process
Without density 0.65g / cm³Papermaking base paper was obtained. This
An acrylic emulsion (Tg = -12) was added to the papermaking base paper.
° C) and a basis weight of 75 g / m²Was obtained. Further
This impregnated paper is subjected to a super calendering process,
I got the paper. Table 1 shows the evaluation results of the obtained decorative board base paper.
You.

Comparative Example 2 50 parts of hardwood bleached kraft pulp (LBKP) and 50 parts of softwood bleached kraft pulp (NBKP) were beaten to a degree of 600 cc.
(CSF) beaten to 10 parts of titanium oxide,
Further, an auxiliary for papermaking was added to make 80 g / m ² base paper with a paper machine. Calendar in the paper making process - to obtain a papermaking base paper density 0.82 g / cm ³ applies processing. The papermaking base paper was impregnated with an acrylic emulsion (Tg = -12 ° C.) to obtain an impregnated paper having a basis weight of 100 g / m ² . Further, the impregnated paper was subjected to a super calender treatment to obtain a decorative base paper. Table 1 shows the evaluation results of the obtained decorative board base paper.

[0017]

[Table 1]

[0018]

The decorative paper base paper of the present invention has a practical level of delamination strength with a smaller amount of resin impregnation than a conventional decorative paper base paper by using a papermaking base paper having a specific density.
It is also practically sufficient in printability. INDUSTRIAL APPLICABILITY The method for producing decorative paper base paper of the present invention is industrially advantageous because it requires less resin impregnation for obtaining a practical level of delamination strength than conventional decorative paper base paper and can be manufactured at low cost.

Claims (2)

[Claims] 1. A decorative board base paper obtained by impregnating an emulsion thermoplastic resin into a base paper sheet into which titanium dioxide is incorporated in an amount of 5 to 10% by weight and subjecting the base paper sheet to a density of 0.1%. A decorative board base paper characterized by being 7 to 0.8 g / cm ³ . 2. A method for producing a decorative paper base paper obtained by impregnating an emulsion thermoplastic resin into a paper base paper into which titanium dioxide is incorporated in an amount of 5 to 10% by weight, wherein the paper base paper has a calender. A density of 0.7 to 0.8 g / cm ³ by a densification treatment according to-.