JPH0160414B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a base plate for decorative laminates, the method of which is paper-pasted.

Conventional methods for manufacturing this type of base plate for decorative laminates are as follows.

Method: A method that involves the steps of forming plywood → pasting paper → undercoating → printing → topcoating.

Method: Formation of plywood → pasting with paper → application of sanding sealer → grinding → entire surface application of paint.

By the way, in this method, the paper surface is porous because the adhesive is not sufficiently permeated into the paper. For this reason, paper peeling is likely to occur, and uneven paint suction occurs due to gaps between fibers or differences in density, resulting in uneven concealment. In addition, pinholes occur in the paint film due to bubbling during application of the paint. Furthermore, there is a drawback that the surface fibers become fluffy due to the absorption of paint, making the printed pattern unclear and giving only a blurry appearance. Next, in method 2, after applying a sanding sealer to strengthen the paper quality and suppress fuzz,
Since it is ground, the paper surface is almost smooth. However, since only a low level of heat is applied when pasting the paper, the adhesive does not penetrate sufficiently into the paper. Therefore, fine fuzz still remains on the paper surface. As a result, even if paint is applied uniformly and printing is performed, the pattern becomes unclear. In order to prevent such fuzzing, it may be possible to treat the paper surface with a sealer, but it is difficult to uniformly impregnate the entire paper with the sealer, and peeling occurs frequently.

What is common to methods a and b is that in both methods, papering is carried out as a separate process after the plywood is manufactured, so that the penetration of the adhesive into the plywood is shallow. Furthermore, a separate area must be provided for the paper pasting process, which makes the process complicated.

In order to overcome these drawbacks of the prior art, the present invention involves gluing paper at the same time during hot pressing, making use of the high temperature of the hot press to allow the adhesive to sufficiently penetrate into the paper, and removing the portions that do not penetrate. The idea was to strengthen the paper quality and eliminate uneven coating.

Embodiments of the method of the present invention illustrated in the drawings will be described below.

First, as shown in FIG. 1, a thin paper adhesive 2 is applied to the surface of the front veneer 1, and a thin paper 3 is laminated thereon. In this way, the heat-pressed paper-covered veneer 4 is constructed.

Adhesives include urea resin, melamine resin,
Thermosetting resins such as phenolic resin, vinyl acetate resin, and vinyl acetate ethylene resin are usually used.

As the thin paper, thin paper, rayon paper, manila paper, synthetic paper, parchment paper, kraft paper, nonwoven fabric, etc. are used.

Next, as shown in FIG. 2, the front veneer 4, the middle veneer 5, and the back veneer 6 pasted with paper before hot pressing are laminated via an adhesive 7 to form a laminate A before hot pressing.

The adhesive used here is a thermosetting adhesive commonly used in the synthetic manufacture of urea resins, melamine resins, phenolic resins, and the like.

The laminate A before hot pressing in Fig. 2 is 1 as a medium veneer 5.
Although a three-ply veneer is shown as a single veneer, the number of medium veneers 5 is not limited to one, and a plurality of veneers may be laminated.

Further, the fiber direction of the veneer may be parallel or orthogonal.

After stacking a plurality of the obtained pre-hot-press laminates A, the stacks are cold-pressed and temporarily bonded. The temporarily bonded pre-hot-press laminate A is simultaneously hot-press molded in accordance with the plywood manufacturing conditions.

In this way, plywood with thin paper pasted on the surface is obtained.

In this way, the thin paper bonding adhesive 2 penetrates and impregnates the surface of the front veneer 1 and the back side of the thin paper 3, and a plywood to which the thin paper 3 is firmly bonded is obtained.

The adhesive strength between the thin paper 3 and the front veneer 1 is arbitrarily determined depending on the type of adhesive 2, viscosity (solid content), amount of application, or density of the thin paper 3.

Next, as shown in Figure 3, using sander 8,
The surface paper material of the thin paper 3 that is not impregnated with the adhesive 2 is removed. In this way, a base plate for a decorative board in which the paper quality of the thin paper 3 is strengthened is obtained.

If necessary, the surface of the thin paper 3 is treated with a sealer.

(Operations and Effects of the Present Invention) The pasting of the thin paper 3 is performed as part of the plywood manufacturing process, and there is no particular need to perform a paper pasting process after hot pressing. Therefore, the manufacturing process is simplified and the space for manufacturing is also small.

Since the thin paper 3 of the pre-hot-press laminate A is attached during hot-press molding, the adhesive 2 for bonding the thin paper is sufficiently permeated into the surface of the front veneer 1 and the back surface of the thin paper 3. Therefore, the adhesive strength of the thin paper 3 to the front veneer 1 is high.

Penetration of the thin paper bonding adhesive 2 of the thin paper 3 In order to remove the surface paper that is not impregnated, the surface is smoothed, and the reinforced portion of the thin paper bonding adhesive 2 that has been impregnated and hardened is exposed on the surface, increasing the surface strength. improves. Furthermore, as a result, the paper surface does not become fluffy and the paper does not peel.

[Brief explanation of drawings]

Figure 1: Front view of paper-covered veneer 4 before hot pressing, Figure 2: Surface view of laminate before hot pressing, Figure 3: Front view of sanding process, Figure 4: Plywood after sanding. Front view of 1: Front veneer, 2: Thin paper adhesive, 3: Thin paper, 4: Heat-press paper pasted front veneer, 5: Middle veneer, 6:
Back veneer, 7: adhesive, 8: sander, A: laminate A before hot pressing.

Claims (1)

[Claims] 1. A thin paper 3 is laminated on the surface of the front veneer 1 via a thin paper bonding adhesive 2 to form a front veneer 4 pasted with a hot press front paper, and then: A front veneer 4, a middle veneer 5, and a back veneer 6 are laminated via an adhesive 7 to form a laminate A before hot pressing.
This pre-hot-press laminate A is then hot-press molded according to general plywood manufacturing conditions, and then the surface of the thin paper 3 of the plywood obtained by hot-press molding is ground to form an adhesive for thin paper bonding. A method for producing a base plate for decorative laminates, comprising: removing the surface paper material to which Agent 2 has not penetrated.