JPH08246384A - Base paper for decorative laminate excellent in pacifying efficiency and printing finnish - Google Patents

Abstract

PURPOSE: To obtain a base paper for decorative laminates improved in opacifying efficiency and printability by making paper using white spruce-based NBKP of the genus Picea. CONSTITUTION: White spruce-based NBKP of the genus Picea is charged into a disintegrator and an aqueous solution of aluminum sulfate is added and mixed with the NBKP to form slurry and a dispersion in which titanium dioxide is dispersed into aluminum sulfate is added thereto and the slurry is made into a paper sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneer base paper used for melamine decorative boards, dup decorative boards, polyester decorative boards and the like.

[0002]

2. Description of the Related Art A base paper for a decorative board used for a melamine decorative board, a dup decorative board, a polyester decorative board, etc. It has been extracted. This veneer base paper is also called titanium paper or pattern paper (for veneer base paper, refer to Veneer Handbook (October 3, 1973).
Published on 0th; edited by New Building Materials Research Institute)). When a large amount of titanium dioxide is made into paper, the hiding property is correspondingly increased, but in terms of cost, the hiding efficiency of producing the required hiding property with a small amount of titanium dioxide becomes a problem. Recently, in view of the cost of the final product, the decorative board, there is an increasing demand for a base paper with a low tsubo. That is, for example, there is a demand for replacing 100 g of paper with 80 g of paper in the past. Even in such a case, since the concealment property must be the same, the ash content is inevitably high, and the concealment efficiency becomes important in terms of cost.

[0003] Further, there is a so-called single color for which no printing is performed and a printing for which printing is performed on the base paper for decorative board, but these cannot be strictly distinguished. In other words, it can be said that a product to be printed usually has a higher smoothness than that for a single color because smoothness is required in terms of print finish. However, a material having a high degree of smoothness can also be used for a single color. Recently, there is a product that can be used for both single color printing and printing because of the cost advantage in production, that is, because it is not necessary to increase the number of products. Bleached pulp has been used as the pulp for the veneer base paper because of its whiteness. The so-called miss dot (also called marbling or white spot), which is an evaluation item of print finish, is influenced by the smoothness of the paper. In terms of smoothness, L material is better as the pulp, and therefore L material alone or L material is mainly used when misdots are considered important.

[0004]

In order to improve the hiding efficiency, it is basically necessary to finely disperse titanium dioxide in the paper. From this point of view, it is important to suppress the condensation of titanium dioxide due to the excessive addition of a wet paper strength agent, a filler retention improver, etc., and a chemical system becomes a problem. Suppressing the coagulation of titanium dioxide means suppressing the agglomeration of long fibers, and the strength becomes a problem, but NBKP, which gives strength even in bleached pulp, may be used. However, it is difficult in the case of low tsubo and high ash differentiation only by adjusting the chemical system, and improvement from other viewpoints is also required.

Further, in recent years, as a print pattern, an abstract pattern such as a pearl tone has been increasing, and it is required not only a miss dot but also an ink paste (the print pattern can be clearly seen) that clearly shows the printed pattern. Is coming.

Under the circumstances described above, an object of the present invention is to provide a base paper for a decorative sheet which is excellent in concealing efficiency from the viewpoint of pulp and which is excellent in ink paste in the printing finish.

[0007]

Means for Solving the Problems As a result of investigations, the present inventors have found that the blending of a specific NBKP improves the hiding efficiency and the ink paste in the finished print. That is, the gist of the present invention is a base paper for decorative boards, which is characterized by using NBKP of the spruce genus as pulp.

First, the raw materials of the present invention will be described step by step. In the present invention, spruce NBKP is used as the pulp. Among the spruce genus, white spruce is particularly excellent in the effect of the present invention as a wood species. For spruce, Tappi T263
om-82 "Identification of coniferous wood and its fibers", and the method may be applied to identification of spruce genus. In terms of misdots, it is preferable to use a mixed paper with L material, mainly LBKP as in the conventional case, rather than only NBKP of spruce genus, but the mixed paper ratio of spruce genus is not particularly limited. Miss dots depend in part on the smoothness, so the mixed paper ratio should be adjusted according to the smoothness and air permeability to be set. Further, the present invention does not exclude the application of NBKP other than spruce genus, and the effect of the present invention can be obtained accordingly if the proportion of spruce genus in the NBKPs used increases. Furthermore, the present invention does not exclude the application of N materials other than NBKP for the same reason. The ratio of NBKP in spruce is about 10
It should be at least%. The beating degree of the pulp is not particularly limited, and the conventional idea may be applied. From the air permeability, the balance of electric charge with titanium dioxide, etc.,
It may be set appropriately.

Next, the base paper for decorative board is impregnated with a melamine resin or the like, so that a wet paper strength agent is blended. As the wet paper strength agent, a cationic paper strength agent is usually used, and PAE or the like is used for neutral paper, but it is not particularly limited, and if conventionally used for veneer base paper, Good, the addition amount should be set in consideration of the wet strength and the setting / fixing state of titanium dioxide. The titanium dioxide is also not particularly limited, and a conventionally well-known decorative plate grade may be applied. Of course, blending can be used, as is used as a conventional method. In addition, color pigments, CM
Other papermaking auxiliaries such as C, sulfuric acid band, dry paper surface strength improver such as starch, filler retention improver and the like may be used depending on the application in consideration of the setting and fixing state of titanium dioxide.

Finally, the seed preparation method of the present invention is not limited, and a conventional preparation method may be used. Basically, the prescription and papermaking of base paper for veneer is charge chemistry, and this idea is based on "electrokinetic phenomenon in the papermaking process" (written by Hiroshi Yamada, published by Paper Industry Times Co., Ltd. on August 10, 1979). ) And the like.

[0011]

The present invention will be described below with reference to examples. The evaluation method and the like in this example are as follows. 1. Beating degree measurement method JIS 8121 (1976) "Test method of freeness of pulp" Shopper type is applied. 2. Ash content JIS 8128 (1976) “Test method for ash content of paper and board”
According to. 3. Concealment Evaluation Method The concealability used as the evaluation method of the present invention means that a black back molded plate prepared by the method described below is measured by a spectrophotometer (trade name MS
-2020; manufactured by Macbeth Co.), and refers to L * value of L-ab color system. The larger the L * value, the higher the hiding power. Considering the same ash content, the higher the L * value, the better the concealment efficiency. 4. Forming method of molded plate Black paper is a black backing plate that is made by impregnating a test paper and a black decorative base paper with high concealing property with a melamine resin and stacking them so that the test paper faces up. 5. Smoothness Measured by Oken smoothness meter 6. Ink paste evaluation method Using a solvent-based blue ink for gravure printing, an ink paste (gradation pattern is clear on the test paper that has been gradation printed with a printing machine (trade name GP-II; Kurabo Industries)). It visually evaluated. From the better one, it is evaluated by ○, △ ↑, △, ×.

Example 1 Using Spruce White Spruce NBKP beaten to a beating degree of 20 ° SR and 25 ° SR, a hand-made sheet was prepared by the following procedure. 15g in the disintegrator
A corresponding pulp and 1500 ml of a 0.2 g / l aluminum sulfate aqueous solution are added and stirred for 15 minutes to form a pulp suspension. Separately, 15 g of titanium dioxide (trade name C
R-85; manufactured by Ishihara Sangyo Co., Ltd.) is added to 250 ml of a 0.2 g / l aluminum sulfate aqueous solution and dispersed for 10 minutes with a mixer. This titanium dioxide dispersion is added to the pulp suspension and stirred with a disintegrator for 20 minutes. From the prepared paper stock, a round hand machine is used according to the usual method.
A handmade sheet of 0 g / m ² was prepared. The smoothness was adjusted to 50 seconds by adjusting the press. The evaluation results of the obtained handmade sheets are shown in Tables 1 and 2.

Example 2 A hand-made sheet was prepared in the same manner as in Example 1 by using black spruce NBKP of the spruce genus that was beaten to a beating degree of 20 ° SR and 25 ° SR. The evaluation results of the obtained handmade sheets are shown in Tables 1 and 2.

Comparative Example 1 A hand-made sheet was prepared in the same manner as in Example 1 using NBKP of the pine wood species Southern pine, which was beaten to a beating degree of 20 ° SR and 25 ° SR. The evaluation results of the obtained handmade sheets are shown in Tables 1 and 2.

Comparative Example 2 A handmade sheet was prepared in the same manner as in Example 1 by using LBKP of eucalyptus type which was beaten to a beating degree of 20 ° SR and 25 ° SR. The evaluation results of the obtained handmade sheets are shown in Tables 1 and 2.

[0016]

[Table 1]

[0017]

[Table 2]

FIG. 1 shows the results of the hiding property evaluation in Table 1 in a diagram. From FIG. 1, it is clear that NBKP of the spruce genus has a high hiding efficiency when the same ash content is taken into consideration, and that the white spruce type is superior. . Further, from the ink paste evaluation results in Table 2, it can be seen that the spruce NBKP has a clear pattern, and the white spruce type is particularly excellent. That is, it is clear that the one using NBKP of the spruce genus is excellent in both the hiding efficiency and the ink paste.

[0019]

[Figure 1]

[0020]

INDUSTRIAL APPLICABILITY The present invention can improve the hiding efficiency and the ink paste in printing by blending a specific NBKP. In the case of low tsubo and high ash differentiation, it is possible to improve the hiding efficiency, which is particularly difficult only by improving the chemical system, from the pulp side by using a specific pulp. At the same time, in response to the increasing number of abstract patterns such as pearl patterns that have been printed in recent years, the ink paste that the required print pattern clearly appears,
It is possible to improve the pulp formulation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a concealing effect of the present invention.

Claims (2)

[Claims] 1. A base paper for a decorative board, characterized in that spruce NBKP is used as pulp. 2. The base paper for veneer according to claim 1, wherein the spruce wood species is white spruce.