JPS59190809A - Method of degreasing and treating 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] 〔Technical field〕 This invention relates to a method for degreasing wood.

[Background technology]

In the method of manufacturing decorative veneer that closely resembles natural zelkova, pine, etc. using a wood veneer obtained by rotary slicing f4, the wood veneer is degreased (degreased) in advance as a pretreatment.
After removing the second part, decolorization treatment, hot water washing treatment, and dyeing treatment were performed.

As the degreasing method, a method of immersing the wooden veneer P in a 1% solution of sodium carbonate and treating it under heat has been adopted.

However, with these conventional degreasing methods, there is a problem in that the dark-colored resin is not removed and remains.
It has been difficult to improve the yield of wood veneers. For this reason, even if the processing time is extended, the resin part is not removed.
Another drawback was that the veneer was burnt with alkali.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for degreasing wood in which resin can be easily removed and the yield can be improved.

[Disclosure of the invention]

The wood degreasing method of the present invention involves irradiating a material (for example, a wood veneer) with microwaves and then immersing it in a degreasing solution.

Figure 1 is a process diagram showing the method of the present invention applied to wooden veneers for manufacturing decorative veneers. After irradiating for a long time, degreasing is performed. After degreasing, decolorization and hot water washing.

It is dyed and finally dried.

Next, as shown in FIGS. 2A) to 2D), a plurality of the obtained dyed veneers 1 are laminated in the uneven mold 2 via an adhesive and bonded by pressure to form an assembled flitch 3. This flitch 3 is sliced at a predetermined angle to obtain a decorative veneer 4 expressing a wood grain pattern on the board surface.

By the microwave irradiation, the permeability of the wood veneer during degreasing treatment can be improved, and as a result, the resin in the wood veneer can be removed with high efficiency. For degreasing, the wood veneer is immersed in a 1% solution of sodium carbonate.
Treat at 2°C for about 1 hour or at a low temperature of about 5°C for about 3 hours.

In addition, the decolorization treatment was performed using N823i307, MgSO
4゛7H20.Immerse the wooden veneer in a decolorizing solution containing Na(-)H, H2O2, etc., and treat it at 60 Soil 5"0 for 1 to 3 hours.The next hot water treatment is at 2°C with 95 Soil. Do this for at least 30 minutes.Roughly speaking, the dyeing process involves dyeing the wood veneer (for example, A
1% solution of 289) at 2.95±2゛0.
Process for ~3 hours.

Further, in the present invention, as shown in FIG. 3, after microwave irradiation, it is preferable to apply an alkaline solution to the resin part of the wood veneer, leave it for 24 hours or more, and then degrease it. As the alkaline solution, for example, Na2Co3. NaOH
An alkaline solution having a concentration of about 1 to 10% can be used, which is obtained by dissolving an alkali such as in a solvent such as water or methanol.

In addition, in the degreasing treatment, the permeability of the wood veneer is improved by microwave irradiation, so the treatment time can be shortened as necessary (for example, 1 hour to 45 minutes). .

Next, an example will be given and explained.

Tsu&i Example 1: Agatis 1. ONN Coro-Tally veneer was used as a wood veneer, and microwaved (500W).

2450MHz) for more than 5 minutes, then immersed in a 1% solution of sodium carbonate and heated to 95±2"C.
Degreasing treatment was carried out for 1 hour.

Then, it was immersed in a decolorizing solution having the following composition and treated at 5°C for 1 to 3 hours.

Na25i3070.4% J So 4.7H200,04% NaOHO, 25% H80218,% (initial concentration) After decolorization, hot water washing, dyeing, and drying were performed according to the usual method to obtain a stained veneer. Second using a board
Decorative veneers were obtained as shown in Figures False) to P).

Most of the resin part of the dyed veneer has been removed, and the yield of wood veneer has improved compared to the conventional method, and the conventional veneer 172, which had a defective resin part, can now be used.

Example 2: A wooden veneer irradiated with microwaves was immersed in a 1% solution of sodium carbonate, degreased at 60±5°C for 3 hours, and then immersed in a decolorizing solution with the following composition. A dyed veneer from which the resinous part had been removed was obtained in the same manner as in Example 1, except that it was treated at °C for 1 to 3 hours.

Na2S130°04% Mg5O, 7H2 (10,04% (5) NIIOH0,15% H2O21,8% (initial concentration) Example 3: Wood veneer (-Agathis 1.Ou thick rotary After irradiating the wood veneer) with microwaves, each of the following alkaline solutions (A) to 4) was applied to the resin of the wood veneer and left for 24 hours or more. However, the information in parentheses is the solvent used.

(A) 1% Na2CO3 solution (water) Old) 5% of I 〃 (1) (C) 5% of NaOH l (I) CD) Na
5% of OH (methanol) 1% of NBCO
# (Water: Methanol - 2:1) 3 After partial application of alkaline solution, degreasing, bleaching, hot water washing and drying were carried out in the same manner as in Example 1 to obtain a dyed veneer. Most of the resin part of this dyed veneer was removed, and the conventional 2A with a defective resin part could be used for manufacturing decorative veneers.

Example 4: A dyed veneer from which the resin part had been removed was obtained in the same manner as in Example 3, except that the degreasing and decolorizing treatments were carried out in the same manner as in Example 2.

(6) [Effects of the Invention] According to the present invention, the resinous portion can be easily removed, and the yield can be improved.

Next, another degreasing method will be explained. That is, this degreasing method uses a highly concentrated solution of hydrogen peroxide (concentration 1O ~ 60%) in the resin part of the wood veneer (wood) instead of pre-treating the wood veneer by microwave irradiation as described above. Apply about 1~
After leaving for 5 hours, a degreasing treatment is performed.

A reference example will be explained below.

Reference example 1. Apply a hydrogen peroxide solution with the following composition to the resin of a wood veneer (Agathis 1.0 thick rotary veneer).
The cargo was left unloaded for about 4 hours.

H2O2 20% NaOH 1% NR2SL 307 1% Next, in the same manner as in Example 1, degreasing treatment 1 decolorization treatment, hot water washing treatment, dyeing treatment and drying were carried out to obtain a dyed veneer, and this dyed veneer was roughly used to prepare a second A decorative veneer was obtained as shown in Figures (A) to FD).

Most of the resin part of the dyed veneer has been removed, and 2/3 of the defective resin part of the conventional dyed veneer can now be used, resulting in a significant improvement in yield.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram showing the process of treating wood veneer using the degreasing method of the present invention, FIG. 2 is a process explanatory diagram showing the manufacturing process of decorative veneer, and FIG. It is a process explanatory drawing which shows the process of treating a wooden veneer using a degreasing treatment method. 1... Dyed veneer, 2... Uneven type, 3... Laminated flitch, 4... Decorative veneer wood Book Car Board 41- Fig. 2

Claims (2)

[Claims] (1) A method for degreasing wood, which comprises irradiating the grain with microwaves and then immersing it in a degreasing solution. (2) After microwave irradiation, the alkaline solution is completely applied to the resin part of the material, and then it is immersed in a degreasing solution.
1) The method for degreasing wood described in section 1).