JPS5894410A - Surface hardening method for wood - 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 The present invention relates to a method for surface curing wood such as wood veneers.

When vinyl chloride sol (hereinafter referred to as "vinyl chloride sol") is used as a resin for surface reinforcement of wood veneers, it is desirable to apply heat to efficiently cure it until sufficient surface performance is obtained. However, when wood veneer is heated strongly, its moisture content drops significantly, causing problems such as noticeable warping, curling, and chipping. For example, when PVC sol is applied to a wooden veneer and cured by applying heat using a dryer, hot roll, press, etc., the heat causes water in the veneer to boil and evaporate, which then diffuses into the PVC sol. It may cause whitening or cause swelling or bubbles. In addition, since moisture evaporates, the veneer tends to crack or chip, making it extremely difficult to handle during subsequent secondary processing steps and storage.

Therefore, the purpose of this invention is to prevent warping of wood.

To provide a method for hardening the surface of wood, which can sufficiently harden a vinyl chloride sol and strengthen the surface without causing cracks, chips, whitening, etc.

An embodiment of this invention will be described below. That is, this wood surface hardening method includes the following steps.

Veneer treatment process Wood veneer with a thickness of 0.3 to 0.7 cm is air-dried, and the moisture content is t.
Reduce it to about -15-. 15 degrees means that the moisture content is just below 0 without causing warping or cracking.

Air-dried wood veneer is impregnated with a high boiling point liquid that is compatible with water and vinyl chloride. This liquid may be ethylene glycol or deoctyl phthalate (DOP
) etc. are used.

(B) The surface of the veneer obtained in the previous step of the veneer surface pretreatment process is instantaneously heated to a high temperature (200°C).
After drying with
V592'tdKV413, etc.) at approximately 50 f/m' (0
Apply the same amount and dry at about 100°C until the Pfimer is no longer sticky (about 5 to 10 minutes).

(C) PVC sol application process - PVC sol of the following composition is applied to the treated veneer surface at 120-150 t/rt? *To clothe. This formulation consists of: 0 vinyl chloride paste resin (Zenel 121), 0 thermosetting plasticizer (Dainippon Ingyu TD 1500), 0 plasticizer (DOP), 30 stabilizers (organotin type), 2 stabilizers (TBPB).
It is 0.3. This formulation is suitable for curing using a hot roll and further drying in a later step, and increases hardness in a short time.

(11 Curing step: Using a hot roll at about 150-160℃, 30cvv'
47cj from about 7 to 10 while feeding at a speed of m i rl
Press the surface of the veneer coated with PVC sol with a pressure of This heating hardens the vinyl chloride sol. At this time, heat is also applied to the veneer at the same time, so in conventional veneers that only contain water, the water evaporates and causes cracks such as 91 cracks. However, in this example, the veneer is impregnated with a high boiling point liquid such as ethylene glycol or deoctitol instead of water, and this liquid is l! Since the water does not boil at the ir hardening temperature, there is no risk of cracking, warping, or whitening of the veneer.

(Smell: Add about 150 ~
Dry and cure in a room at 160°C for about 5 minutes to fully impregnate the resin. In this way, as shown in the drawing, the surface of the wood veneer 10 is hardened and the vinyl nonachloride resin coating 2 is provided! can get.

In this way, the surface treatment force can be supervised while preventing the thin wooden plate 1 from cracking, warping, cracking, etc.

Moreover, since the liquid such as deoctyl phthalate impregnated to prevent the veneer 1 from drying loses its compatibility with vinyl chloride sol, etc., the adhesion between the veneer 1 and the vinyl chloride resin coating 2 after curing deteriorates. improves.

As described above, the method for hardening the surface of wood according to the present invention involves impregnation treatment with a liquid having a high boiling point and good compatibility with water and vinyl chloride in place of moisture in the wood, and then coating with vinyl chloride resin and phosphorization. Because it is cured at high heat, the hardness of vinyl chloride resin is sufficiently increased, and the wood is prevented from drying out and cracking during curing.

Warping, cracking, whitening, etc. are prevented. As for tightening, the aforementioned impregnating liquid also has the effect of improving the adhesion between vinyl chloride and wood after hardening.

[Brief explanation of the drawing]

The drawing is a sectional view of one embodiment of the invention.

Claims (1)

[Claims] a step of reducing the moisture content of the wood and impregnating the wood with a liquid having a high boiling point and having good compatibility with water and vinyl chloride; and applying a vinyl chloride resin sol TM to the surface of the impregnated wood.
A method for curing the surface of wood, which includes a step of applying cloth, and a step of curing the applied vinyl chloride resin at a high temperature.