JPS60187506A - Method of treating veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a method for treating a veneer to form a protective film on the surface of the veneer.

[Background technology]

Artificial decorative veneer is used as the embossment for decorative boards.

This artificial decorative veneer is usually made as follows. That is, the veneers obtained by rotary slicing are degreased and bleached, then dyed, the obtained dyed veneers are laminated with an adhesive, pressure molded to obtain an assembled flitch, and this is sliced. It is obtained by The artificially decorated veneer made through this process is attached to plywood and then painted to become a product. In order to prevent paint from being sucked into the veneer during painting, conventional surface treatments (sealing treatments) that create a protective film on the surface of the veneer, such as impregnating the veneer with resin such as thermosetting resin, have been applied. ) was being carried out. However, when artificial decorative veneers are impregnated with a large amount of resin, the transparency of the veneer increases, and after the veneer is pasted, the color and pattern of the white root can be seen through the veneer, resulting in a "bleed-through" phenomenon. There was a problem that the texture of the wood veneer would be damaged.

Artificial decorative veneers impregnated with a large amount of resin should not be sanded or polished if the impregnated resin is a soft resin.
There was a problem that it was difficult to sand because the AL' was easily clogged.On the other hand, when the impregnated resin was a hard resin, there was a problem that it was easy to break.

In addition, there were other problems as follows. In other words, the sliced veneer for lamination before making the artificial decorative single machine, one of which constitutes a part of the grain of the artificial decorative veneer. However, the adhesive applied during lamination penetrated into the sliced veneer, causing the grain of the finished artificially decorated veneer to be uneven. This tendency is particularly pronounced when colored adhesives are used. Therefore, in order to prevent the adhesive from penetrating into the sliced veneer, a process has conventionally been carried out in which a protective film is formed by hardening the resin applied to the surface of the veneer. However, even in this case, a problem occurred in that the wood texture of the finished artificially decorated veneer was impaired due to the large amount of impregnated resin.

[Purpose of the invention]

Therefore, this invention uses soil that has the effect of preventing paints and adhesives from penetrating into the veneer, does not cause the "a reflection" phenomenon on the veneer, and improves the wood texture of the veneer. The purpose of the present invention is to provide a method for treating a veneer that can improve sanding properties without damaging the veneer.

[Disclosure of the invention]

The inventors have made extensive studies to achieve the above object. As a result, instead of immediately heat-curing the thermosetting resin attached to the veneer, it is possible to heat-cure the resin in a bath agent vapor that can be dissolved in the bath, and then dry it to completely vaporize the solvent. The present invention was completed based on the discovery that good results could be obtained.

The gist of this Ichimei is a method for treating Li plates in which heated steam of a solvent capable of completely dissolving the thermosetting resin is applied to the surface of the car trunk immediately after the thermosetting resin has been attached. . This will be explained in detail below.

A case will be described in which surface treatment is performed on an artificial decorative veneer obtained by slicing a laminated frituna; first, thermosetting 11 fat is applied to the artificial decorative veneer. Adhering methods include immersing the unit in a resin liquid and applying resin liquid to the surface of the unit. The box/j limbs may be made of IJF1 solution using a solvent or liquefied resin. The artificial decorative veneer immediately after the thermosetting resin has been attached is exposed to heated vapor of a solvent capable of dissolving the attached resin. Heat treating the veneer immediately after the resin has been applied is done before the resin is impregnated into the veneer! This is because it provides peace of mind by allowing the fingers to harden on the surface of the veneer. Further, the reason why heat treatment is performed using heated vapor of a solvent that can be commonly understood as FM resin is to harden the resin in a state containing the solvent.

In other words, when an artificial decorative veneer that has been cured in a state containing a solvent is then dried, only the solvent evaporates and voids are created in that area, resulting in the resin foaming and hardening. This is because it is possible. As a result, a small amount of resin is uniformly adhered and hardened to the surface of the artificial makeup unit.
A reflection is formed. To adjust the state of the resulting protection (anchor), it is best to adjust the amount of bath agent in the curing solution when attaching the resin to the veneer, the amount of steam in the heated steam, the temperature, etc. By doing so, the degree of foaming of the resin and the size of the bubbles can be adjusted.
After being pasted onto a board, it is manufactured into a product through processes such as sanding and painting. During the sanding process, the brittle foamed resin is sanded, so even soft resin can be sanded well.

The following combinations of thermosetting resins and bath additives can be used: For example, combinations of thermosetting resins made by modifying vinyl acetate with thermosetting resins such as melamine resin 11, urea resin η, sunalene resin and water to dissolve it, polyurethane resin B, polyester Examples include a combination of resin and methanol or toluene to dissolve it, and a combination of melamine tat fat, urea resin, acrylic resin, etc. and water or methanol to dissolve them. However, the combination is not limited to these combinations.

Examples are given below.

(Example 1) Using ammonium sulfate as a curing agent, vinyl acetate τ melamine resin was modified into a thermosetting resin with one finger.

This resin was dissolved in water using a surfactant to bring the resin content to 50% by weight. This resin solution was applied to one side of an artificially decorated veneer at a rate of 50 g/m2 using a roll coater. This artificial makeup unit was exposed to saturated steam at 150° C. for 15 minutes in a closed container without drying. After that, let the artificial makeup machine dry and jit! An artificially decorated veneer in which the foam was cured was obtained.

(Example 2) A water-bathable polyurethane resin was bath-dissolved in water, and the resin content was set to 0 weight.This 111 fat bath liquid was coated on one side of an artificial makeup unit with a flow coater at 50g/rr+2.
Coated. This single artificial makeup machine can be used without drying out.
It was exposed to saturated toluene vapor at 100° C. for 30 minutes in a closed container. Thereafter, the artificial decorative veneer was dried to obtain an artificial decorative veneer in which the resin was foamed and hardened. Note that methanol was used because steam can be easily obtained and quenched.

(Example 3) The same treatment as in Example 1 was carried out using a melamine emulsion. As a result, an artificial decorative veneer in which the resin was foamed and hardened was obtained.

(Example 4) The same treatment as in Example 2 was performed using an acrylic emulsion. As a result, an artificial decorative veneer in which the resin was foamed and hardened was obtained.

(Example 5) Solvent-free polyurethane resin liquid was applied at 50 g/m2 onto one side of an artificial makeup unit using a roll coater. This artificial decorative veneer was exposed to saturated toluene steam at 150° C. for 20 minutes in a closed container without drying. Thereafter, the artificial parking lot was dried to obtain an artificial decorative veneer in which the resin was foamed and hardened.

(Example 6) A polyester resin toluene bath solution with a resin content of 60% by weight was applied to one side of an artificial decorative veneer at 70% by weight.
g,/rn2 was applied. Thereafter, this artificial decorative veneer was heated and dried in the same manner as in Example 5. As a result, an artificial decorative veneer in which the resin was foamed and hardened was obtained.

Next, surface treatment of the sliced veneer for assembly will be explained. In this case, the artificial decorative veneer obtained by assembling and slicing the surface-treated sliced veneers may be subjected to surface treatment to form a protective film as described above.

First, a thermosetting resin is applied to the sliced veneer for assembly. The attachment method is the same as the resin attachment method for artificial decorative veneers, so it will not be described here. Immediately after the thermosetting resin has been applied, the sliced veneer is exposed to heated vapor of a solvent capable of dissolving the adhered resin. After that, the sliced veneer is dried, only the bath agent is vaporized, and the resin is uniformly adhered to the surface of the veneer in a foamed form and hardened.
This will form L-han. Sliced veneers made of foamed and hardened resin are assembled with adhesive, flitch-molded, and then sliced to create artificial makeup units.

The method of adjusting the state of the protective film obtained on the surface of the veneer, the resin and solvent used, etc. are the same as the treatment method for the artificial makeup unit described above.

Examples of processing methods for sliced veneers for assembly are listed below.

(Example 7) 50g//r+12 of the same thermosetting 1tJd solution as in Example 1 was applied to both sides of a single slice machine using a roll coater.

Thereafter, a single slice machine in which the resin was foamed and hardened was obtained by performing the same treatment as in Example 1.

(Example 8) Using the same polyurethane resin solution as in Example 2, a single slice machine was treated in the same manner as in Example 2.

As a result, a sliced veneer in which the resin was foamed and hardened was obtained.

(Example 9) Using the same melamine emulsion as in Example 3, 50 g/rT was applied to both sides of the sliced veneer using a roll coater.
12 applied. Thereafter, the same treatment as in Example 3 was performed. From this process, a sliced veneer with foam hardening was obtained.

(Example 10) The same treatment as in Example 4 was performed on a sliced veneer using the same acrylic emulsion as in Example 4. As a result, a sliced veneer in which the resin was foamed and hardened was obtained.

(Example 11) The same bath-free polyurethane resin solution as in Example 5 was applied to both sides of a sliced veneer at a rate of 50 g/m each using a roll coater.
I made a 2m cloth. Thereafter, the same treatment as in Example 5 was performed to obtain a sliced veneer in which the resin was foamed and hardened.

(Example 12) Using the same polyester resin toluene solution as in Example 6, a sliced veneer was subjected to the same treatment as in Example 6. As a result, a sliced veneer in which the wood 1j was foamed and hardened was obtained.

〔Effect of the invention〕

The veneer treatment method according to the present invention involves applying heated vapor of a solvent capable of dissolving the thermosetting resin to the surface of the veneer immediately after the thermosetting resin has been attached, so that only a small amount of resin can be used. It is possible to form a protective film on the surface of the veneer that blocks the penetration of paint and adhesives, reducing the amount of resin impregnated into the eyeplate, thereby suppressing the occurrence of the "bleed-through" phenomenon. This has the effect of not damaging the wood feel of the veneer. Furthermore, since the resin adheres to the surface of the veneer in a foamed form after the treatment, sanding properties are improved.

Agent: Patent attorney Takeshi Matsumoto

Claims (1)

[Scope of Claims] (1) A method for treating a veneer in which the surface of the veneer immediately after the thermosetting resin is attached is exposed to heated vapor of a solvent capable of bath-dissolving the thermosetting resin. (2) The method for treating a veneer according to claim 1, wherein the veneer is an artificially decorated veneer. (3) The method for treating a veneer according to claim 1'sJi, wherein the veneer is a nullice veneer for lamination. (ω Claim 1 in which the thermosetting resin is vinyl acetate modified with a thermosetting resin, and the solvent is water.
The method for treating a veneer according to any one of Items 1 to 3. (5) The method for treating a veneer according to any one of claims 1 to 3, wherein the thermosetting resin is a polyurethane resin and the solvent is tutanol. (6) The method for treating a veneer according to any one of Claims 13 and 3, wherein the thermosetting resin is a polyurethane resin and the solvent is toluene. (7) The thermosetting resin is a polyester resin, and the bath agent is toluene. The method for treating a veneer according to any one of In to 3.