JPS62282902A - Manufacture of grain exaggeration reinforced timber - 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 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a manufacturing method for emphasizing and strengthening the grain of a wood material, and more specifically, it relates to a method of manufacturing a wood material for enhancing and strengthening the grain of a wood material using chlorine gas. The present invention relates to a manufacturing method in which a synthetic resin liquid is injected to strengthen the product after the enhancement process.

(Prior Art) In wood materials, especially conifers, the tracheids in the spring wood are larger than in the fall wood, and the cells themselves are larger and thinner. Therefore, the spring wood is pale in color.

On the other hand, contrary to the above, the cane material usually has small cells, a thick membrane, and a dark color.

(Problem) As a means of emphasizing the grain of these wood materials and strengthening them, a method of injecting a synthetic resin liquid into the fibers mmta of the wood materials has been used. However, this method often results in the loss of the unique soft texture and feel as well as the decorative appearance of the wood material.

When a synthetic resin liquid is injected into a straight-grained thin board of coniferous wood as a wood material, since the tracheids in the spring wood portion are large as described above, a large amount of the resin liquid is injected, and the light transmittance is further improved. Taking advantage of this transparency, the so-called transparency of the spring wood, a method is used to clarify the wood grain by using a dark-colored adhesive for the base material and reversing the shading of the spring wood and autumn wood. It will be done. However, because the dark color of the adhesive used for the base material is uniform, the C lightness created by the spring wood and fall wood areas cannot match the lightness and lightness of the original natural wood grain. Moreover, if the thickness of the wood material increases, e
It is pale or not fully developed, giving only an indistinct wood grain pattern as a whole.

(Means for Solving the Problems) The present invention was made to solve the above problems. First, a wooden material is treated in a chlorine gas atmosphere, and the wood grain is emphasized by the action of the chlorine gas. At the same time, a synthetic resin liquid is then injected to strengthen the wood material. As a result, the wood material, that is, the spring wood part is light colored and the autumn wood part is dark colored, and the original characteristics of the wood material are not lost and the deep grain of the wood is emphasized as a whole. It is strengthened by injection of

(Structure of the invention) The manufacturing method of the present invention will be explained in detail below.

First, as the wood material, various types of sawn wood boards, decorative veneers, etc. are used. This wood material is pre-treated to have a moisture content of about O to too much moisture.

In the first step, the wood material is stored in a chlorine gas atmosphere.

In other words, a wooden material is placed in a sealed container, and at room temperature and pressure, the air inside the container is replaced with chlorine gas to create a chlorine gas atmosphere inside the container, and in the case of thin wood materials such as sliced veneers, this is done for a short period of time. (in units of several seconds to minutes), or in the case of thick wood such as square lumber, requires a long process (in units of hours).

The amount of chlorine gas varies depending on the size and shape of the wood material to be treated, but it is 1 to 1 liter per weight of the wood material.
An amount of about 0% is desirable. In addition, when chlorine gas is allowed to permeate into the interior of the wood material, it is sufficient to carry out depressurization and deaeration treatment as a pretreatment, add chlorine gas to normal pressure, and perform gas phase treatment.

. Next, as a second step, a synthetic resin liquid is injected into the wood material. The usual method of injecting synthetic resin liquid into wood is WP C (W
This method can improve the physical properties of wood such as abrasion resistance, water resistance, impact resistance, chemical resistance, crack resistance, and rot and insect repellency.

For this WPC construction method, it is essential to uniformly inject the synthetic resin liquid into the entire wood material. The synthetic resin liquid used in the WPC construction method is, for example, styrene.

Various monomers such as methyl methacrylate and butyl acrylate, diallyl phthalate prepolymers.

Oligomers such as unsaturated polyester, various water-soluble resin liquids such as melamine resin, phenol resin, urea resin, etc. are used.

The injection method used is the so-called reduced pressure or pressurized injection method. Although the reduced pressure or pressurized method differs depending on the processing method, it takes approximately 1 hour to 10 hours, and after the injection processing is completed, heat-pressure curing is performed using a conventional method. .

(Effects of the Invention) According to the above manufacturing method, the grain of the wood material becomes clearer by the chlorine gas treatment, and the physical properties of the entire wood material are significantly improved by injection of the resin liquid.

As a result, ■As a decorative veneer, it exhibits a clear wood grain pattern, increasing its commercial value.■It has excellent dimensional stability due to the mutual effect of chlorine gas treatment and resin injection, and ■Color unevenness of wood materials ( A mixture of red meat and white meat) is eliminated.

Example 1 100 pieces of Japanese pine wood veneer (thickness: 0.3 mm @ 115 mm, length: 30001 fil, water content: about 13%) were placed in a closed container. Then, the air in the container was replaced with chlorine gas to create a chlorine gas atmosphere, and treatment was performed at a temperature of 20° C. for 12 hours. Next, 2 parts by weight of benzoyl peroxide (50 parts by weight)
% paste), 30 parts by weight of methyl acetate and 20 parts by weight of toluene were added to 50 parts by weight of a heavy unsaturated polyester resin, stirred thoroughly to prepare a resin liquid for impregnation, and the resin liquid for impregnation was heated under the reduced pressure mentioned above. Pour into pressure cooker: 10Kg/cr
The mixture was pressurized to n' with compressed air and allowed to stand for 3 hours. After the resin solution for impregnation was sufficiently injected into the treated veneer, it was cured under heat and pressure.

The resulting veneer was finished in a brownish-brown color overall, and the shading in the spring and fall wood areas was particularly clear, creating a beautiful wood grain pattern.

Comparative Example 1 After a sufficient amount of impregnating resin liquid was injected into a treated veneer, the veneer was adhered to a compatible board under heat and pressure, and various physical property tests were conducted to obtain the test results shown in the table below.

As can be seen from the test results, it exhibited remarkable effects in terms of dimensional stability and hardness compared to conventionally coated products.

Claims (1)

[Claims] A method for producing reinforced wood with enhanced wood grain, which comprises treating the wood material with chlorine gas and then injecting a synthetic resin liquid into the wood material to strengthen it.