JPS60257204A - Impregnating coloring method of 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 [Object of the Invention] (Industrial Application Field) The present invention provides a new technique for coloring wood, and is suitable for use in wood crafts, furniture, etc. It brings a new aesthetic means of decoration to the field of decorative materials and architectural wall materials.

(Conventional technology) Traditional coloring techniques include base coloring and blind coloring.

Coloring (mixing coloring agents into the medium and top coats, etc.)

It is known to apply color to the paint film itself), or to use these in combination, but both of them apply the coloring agent uniformly to the wood surface, so this is a drawback.

b) Even if the shading can be expressed, it is monotonous and tends to lack accent.

Since the coloring is limited to the surface of the material, it easily peels off and becomes ugly when exposed to external damage, and is also difficult to repair.

C) The coloring process itself is complicated and inefficient.

2) In the polishing process such as intermediate coating after coloring work, only one colored part is polished, which tends to cause color unevenness.

It has the following disadvantages.

(Problems to be Solved by the Invention) Therefore, the present invention departs from the above-mentioned conventional coloring techniques and first impregnates the inside of the wood with a coloring agent using tubular tissues such as vessels and tracheids. At the same time, we tried to selectively limit the penetration route of the colorant and contrast and highlight the tissue penetrated by the two colorants and the tissue not penetrated by the colorant. Aesthetically expresses the second annual rings with strong accents.

(Naka) Internal coloring allows it to maintain the same aesthetic appearance even after damage or wear and tear.

The aim is to develop a new coloring technique that can withstand mass production and enable efficient production processes.

〔composition〕

(Means and methods for solving the problems) The impregnation coloring method of the present invention is as follows.

(2) Surface sealing process However) depressurization process C) Impregnation and pressure process ■) Drying process Since the process is divided into four steps, each item will be explained below.

(4) Surface sealing process Wood to be colored generally has a butt end surface, a straight grain surface, or a board grain surface.

In the final method, surface sealing is used to occlude vessels, tracheids, and other tubular tissues or gaps exposed on each surface such as the butt end surface, with the aim of blocking or selectively limiting the ingress route of the colorant. A specific example thereof is a method in which a liquid cured resin such as an epoxy resin or a polyurethane resin is applied to form a film. There are two purposes for limiting the selection of the invasion route, one of which is (α) as mentioned above, to create an infiltrated tissue and a non-invaded tissue in the wood, and to emphasize the contrast with color to create an aesthetic accent. The other is to avoid as much as possible the occurrence of colored spots due to the coloring agent not reaching the inside of the wood or being insufficient in its amount.

There are three methods for this surface seal: a complete seal method, a divided seal method, and a selective seal method, and these two methods are used in combination.

The first complete sealing method is to block all intrusion from the sealed surface (see Figure 1).

The second split sealing method is to seal a specific area of the wood surface in parts. 2 For example, if heartwood and sapwood appear on the mouth surface of a tree for needles, either one of them is sealed and occluded.
(See Figure 2 (2)) Also, when growth rings appear in layers on the mouth surface of a broad-leaved tree, one of the annual rings is sealed and closed, and the other is left as an open mouth. etc. (see Figure 2)).

The effect of this divided seal method is mainly in accordance with the above-mentioned objective (α) of color contrast.

The third selective sealing method is used when relatively large-diameter tubular tissues (e.g., vessels) and small-diameter (e.g., radial tissues) are mixed and exposed on the wood surface.

Selectively seal and occlude only the small diameter tissue.

Large diameter ones are left open. To realize this, a liquid resin with a relatively low viscosity, such as sealant resin I, is selected, and its low viscosity has a small surface tension, so it does not form a film in large-diameter holes, but can form a film in small-diameter holes. can be used (see Figure 3).

The effect of this selective seal method is different from the split seal method.

It has two functions.

One of them is, for example, in accordance with the above-mentioned purpose (α) of limiting the route, in which only the radial tissue of the hardwood material is left uncolored and the other tissues are colored for color contrast.

Another effect is that when the wood to be colored becomes long, the colorant tends to not reach the central part, but on straight-grained surfaces,
When a selective seal is applied to the grain surface of the plate, the coloring agent enters from the large-diameter tissue in the vicinity and acts to replenish the coloring agent (
This is in line with this.

Note that the seal of the small diameter hole prevents the entire surface from being uniformly colored.

It is effective to combine the above three sealing methods as shown in the table below.

Old) Depressurization process Next, the colored wood with the above-mentioned seal is shown in Figure 4.1. Place it in an airtight impregnation tank and move it to the depressurization process.

This process is to remove gas and moisture contained inside the wood to facilitate the impregnation of the colorant, but the two-step method also shortens the decompression time and avoids weakening of the wood structure caused by low temperatures. For this purpose, a heating means such as a high frequency wave or a heat exchanger shall be provided.

It was experimentally confirmed that the pressure reduction time is expressed by the following formula f.

y≧, 5(ax+b) However, the reduced pressure should be 20++++H1 or less.

y: Decompression time (hour) X: Length in the fiber direction of the wood to be colored (meter) a,
b: Constant For hardwood a = 20. b-1
, 0 For coniferous trees amaro 30. b-5 In Figure 4, (TI) is an airtight impregnation tank, (T2) is a colorant tank that stores colorant, (PI) is a vacuum pump, (PI) is a pressure pump, ff1) ~ ( V, ) are each a valve.

(Q Impregnation and pressurization step This step is to impregnate the coloring agent into the inside of the pore structure after gas etc. have been removed in the depressurization step.

The work begins after the predetermined decompression time has elapsed.

In Fig. 4, (Ml), CV"t> is opened and the coloring agent is introduced into the impregnation tank, and the wood to be colored is immersed. The wood to be colored is left in this state for a while. It is the same as the one above.

Next, since the above impregnation alone is still insufficient to penetrate into real wood fibers, etc., further impregnation is to be carried out.

Operate the pressure pump to pressurize the tank.

Appropriate pressure conditions are a maximum pressure of 30 to 9/d for hardwoods and 10 to 9/d for softwoods, and when obtaining a patterned coloring material, the pressurization time can be expressed by the following formula: This was revealed through experiments.

y≧ax'+c y: Pressure time (hour) X: Length in fiber direction of colored wood (meter) a, b
, c: constant, hardwood a = 5. b=1.3. ,
c=3 conifer a””8. b=1.3. c=1■)
Drying process At the end of the drying process, a drying process is performed according to a conventional method such as natural drying or heat drying to complete the coloring according to the present invention.

■ Impregnation - Colorant used The coloring agent used for the above impregnation is prepared as follows.

The conditions for the coloring agent used in the powder method are first that the solvent is b) Good affinity with wood and excellent permeability.

1) It has good drying properties, and as a dye, 3) It has a low molecular weight that is compatible with the solvent and has excellent permeability.

2) It is required to have good color development and e) good weather resistance. These conditions can be met by an alcohol solvent as a solvent and a 7zo dye as a dye. This concentration is 0. It is used after being adjusted to 1 to 1.2 wt%. - [Effects of the invention]:) The purpose listed at the beginning has been achieved, which could not be achieved using conventional coloring techniques. It is now possible to express the unique structure of wood tissue in the form of wood grains and patterns, making it possible to create crafts,
A new technique can be provided as a means of aesthetically decorating furniture, fittings, etc.

n] Materials such as thinned coniferous wood or small-diameter wood, which until now have been used only as construction materials due to their low aesthetic value, can now be applied to high-value-added products such as crafts using the one-piece method. became possible.

111) Of course, even if the surface suffers damage, partial damage, wear, etc., it will be less noticeable compared to conventional coloring, and the same beauty can be maintained, and repairs are also extremely easy. be.

IV) When used as a surface material for veneer plywood, etc., since the inner layer is colored, a large amount of coloring material can be obtained as it is when sliced, greatly improving the efficiency of conventional work.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention. Figure 1 is a perspective view showing the complete sealing method, Figure a) is a side view of the same, and factor 2 (4) is a split sealing method showing the heartwood and sapwood of wood. (B is a perspective view of the method applied to each annual ring, FIG. 3 is a perspective view showing the selective sealing method, FIG. 4 is a schematic side view showing the impregnation coloring device, Figure 5.6.7.8 shows Example 1.2.
A perspective view showing each coloring state of 3°4. Patent applicant Tochigi Prefecture Oni 2 (A) 12 years old 1 year old λri E mouth

Claims (1)

[Claims] In order to limit the infiltration route of the coloring agent, a seal is applied to partially or selectively close tubular tissues such as vessels exposed on the surface of the wood to be colored. Next, the wood to be colored after sealing is subjected to a reduced pressure treatment in an airtight tank equipped with a heating means in order to remove internal gases, moisture, etc. Next, in the airtight tank after the pressure reduction, about 0%,
An adjusted coloring agent of 7zo dye diluted to a concentration of 01 to 1.2 wt % is injected into the airtight tank, and the inside of the tank is pressurized to promote penetration of the colorant into the internal tissue. A wood impregnation coloring method characterized by a final drying process.