JPS58149955A - Method for dyeing wood veneer - Google Patents

Abstract

PURPOSE:To dye wood veneer rose pink with excellent fastness to light, by treating an extract, obtd. by treating wood with an aq. alkaline soln., with a H2O2 soln., adding a brown dye contg. -NO2 group thereto, and dyeing wood veneer by using the resulting aq. soln. CONSTITUTION:Wood chip 1 is cooked in an aq. alkaline soln. 2 having a pH of 10-12 to elute alkali-soluble matters (the concn. of eluate being 1-2%) H2O2 is added to the resulting aq. alkaline soln. 2' contg. eluted alkali-soluble matters in such an amount as to give the concn. of H2O2 of 1-5%. Then an oxidation treatment is conducted at 60-90 deg.C. After H2O2 is completely consumed by this oxidation treatment, a brown dye contg. -NO2 group is added to the oxidation- treated soln. 2'. By the addition of the dye, the soln. 2'' blended with the dye turns red. A white wood veneer 3 is immersed in this soln. 2'' to dye the veneer rose pink. The dyed veneer has improved light resistance, little suffers fading and can retain clear color tone over a long period of time.

Description

[Detailed description of the invention] This invention relates to a method for dyeing wood veneers.

A plurality of wood veneers are laminated with adhesive, pressed and tightened to form a 7-rich flitch, and this flitch is sliced in a direction that intersects with the lamination direction to form each wood-quality wood board. The wood material veneer used in the method for manufacturing a decorative veneer for obtaining a finished decorative fist whose cut surface resembles an annual ring layer imparts a hue resembling that of natural wood to the reproduced wood grain pattern. It is customary to dye the material in a predetermined color before the lamination process.

On the other hand, the above-mentioned lamination gives the veneer a pale pink color that can be seen in the heartwood of hinoki or cedar.

When conventional dyeing treatments were used, the light fastness of the dye was poor, and the pale pink portions of the laminated decorative laminated board obtained by dyeing in this manner were prone to fading, making it difficult to commercialize the product.

In addition, conventional dyeing treatments for wood veneers having a thickness of 0.6 to 1.5111 mm have the disadvantage that it takes a long time to uniformly dye the interior of the nest boards.

Therefore, an object of the present invention is to provide a method for dyeing wooden nest boards, which can dye wooden veneers a light pink color with good light resistance and in a short time.

An embodiment of this invention is shown in the first example.

That is, in this method of dyeing wood veneer, the wood veneer is dyed and treated in a light pink color by the following procedure.

(1) A thin piece of wood 1 is boiled in an alkaline aqueous solution 2 having a pH of 10 to 12 to elute alkali-soluble components (eluted component concentration of 1 to 2 liters) (first internal cause).

(2) Add the alkaline aqueous solution 2'KH202 in which the alkali-soluble matter was eluted to a concentration of 1 to 5 liters, and
Oxidation treatment is carried out at ℃ ((B) in the same figure).

(3) After H2O2 is completely consumed by the oxidation treatment in step 1, a plaquene dye containing a K-No2 group is added to the oxidation treatment solution il (-Figure (C)).

(4) A white wood veneer 3...
This wood veneer 3... is dyed pale pink by dipping it in the wood (Figure #4 (D)).

In this way, the alkaline aqueous solution from which the alkali-soluble content of the wood tissue has been eluted is oxidized with a H,02 solution, and then the saponified solution ftc-No and a plaquen-based dye having a group are added to produce a red dye. The blended solution f was obtained, and this solution 21' was used as a dyeing solution to dye the wooden veneer 3 in pale pink, so that the following effects were obtained.

■ The light-pink dyed veneer has improved light resistance, and even when applied to laminated decorative veneers, the pale pink part of the laminated decorative veneer will not fade, and the color tone will remain clear over a long period of time. can be kept.

(2) The adhesion of the dyeing solution to the wood veneer is improved, the entire interior of the veneer can be dyed uniformly, and the dyeing time can be shortened to 1/2 compared to conventional methods.

As described above, (1) the method for dyeing wood veneers of the present invention includes an alkaline aqueous solution treatment step in which wood is treated with an alkaline aqueous solution to elute alkali-soluble components from the wood structure, and an alkaline aqueous solution containing the alkali-soluble components is The method includes an oxidation treatment step in which an oxidation treatment is performed using an H2O2 solution, and a dyeing treatment step in which a plaquen dye having -NO2 groups is added to the oxidized aqueous solution and the wooden veneer is dyed with this aqueous solution. The light pink dyeing of the plate can be carried out uniformly over the entire inner layer of the guide plate with good light resistance, and the dyeing process time can also be significantly shortened.

Next, in the manufacturing method of laminated decorative veneer, a processing method that can easily perform a processing step of imparting a natural-looking shading distribution to the summer wood layer with a wood grain pattern to be reproduced will be described.

In other words, this treatment method improves the surface Kl of the spring material veneer.
Apply colored adhesive etc. to the material color and assemble 7 rich→
When expressing a summer wood layer with the cut surface made of the colored adhesive on the wood grain pattern reproduced on the wood surface of the laminated decorative veneer obtained through the slicing process, the summer wood colored adhesive is applied to the spring wood material single layer. If the shading is applied to the board 4 in a band-like manner as shown in FIG. 3, the shading distribution of the reproduced summer wood layer will become regular, resulting in the shading similar to that of the natural material 5 shown in FIG. 2. In order to avoid this, the colored adhesive 6 for the dark colored portion of the summer material is applied to the spring material veneer 4' as shown in Figure 4. Colored adhesive for dark colored areas of summer material6
This is a dispersion coating processing method that can easily perform random dispersion coating, and an example thereof is shown in the SS diagram.

The dispersion coating treatment method of ξ is such that a supply device 8 is arranged above the coating roll 7 to supply the colored adhesive 6 for the dark colored portion of the summer material in a flow manner, and as the coating roll 7 rotates, the supply device 8 is By moving the roll 7 in the width direction and passing the spring material veneer 4' through the application roll 7, the spring material veneer 4' is applied.
The colored adhesive 6 for the dark colored parts of the EIK summer material is randomly dispersed and applied. The surface of the spring material veneer 4' is uniformly coated with a colored adhesive for the light colored portion of the summer material before being passed through the application roll 7.

Next, another example of the one-dispersion coating treatment method is shown in FIG.

In this dispersion coating treatment method, a roll coater 9 is disposed on the front side of the coating roll 7' and rotates in contact with the coating roll 7'.
While supplying the colored adhesive 1G for the light-colored portion of the summer material to the entire surface of the material, a driven roll 11 that is in contact with the application roll 7' is placed on the rear side of the application roll 7', and this A supply device 8' for supplying the colored adhesive 6 for the dark-colored portion of the summer material in a flow manner onto the roll 11 is provided so as to be able to reciprocate in the width direction of the driven roll 140, so as to supply the colored adhesive 6 for the light-colored portion of the summer material of the application roll. Agent 1041 The colored adhesive 6 for the dark colored portion of the summer material is randomly dispersed and coated on the upper layer of the cloth surface, and the colored adhesive 6 for the dark colored portion of the summer material is applied to the surface of the material veneer 4' that passes through the coating roll 7'. Distribution of colored adhesive 6: total amount of colored adhesive 10 for the light colored part of the summer material
The fi pupil cloth layer is polymerized and coated.

On each side, the colored adhesive 6 for the dark colored portion of the summer material may be replaced by a coloring agent such as dark ink.

Regarding the movement control of each of the supply devices 8, 8' and the opening/closing control of the pulp, predetermined operations are carried out in synchronization with the supply operation of the spring material veneers/4" to the coating rolls 7, 7'. The test shall be carried out using a micro combinator, etc., as shown in the table below.

[Brief explanation of the drawing]

Figures 1 (A) to D) are process explanatory diagrams showing one embodiment of the present invention, Figures 2 to 4 are explanatory diagrams of the backing layer representation of laminated decorative laminated board, respectively, and Figures 5 and FIG. 6 is an explanatory view showing the process of dispersing and applying the summer material adhesive to the spring material nesting board. Aqueous alkaline solution (alkaline solution elution),! ...Oxidation treatment liquid, 2''...Dye blending liquid G, 3...Wood veneer m
-C Figure 4 377- Figure I6

Claims (1)

[Claims] an alkaline aqueous solution treatment step in which the wood is treated with an alkaline aqueous solution to elute the alkali-soluble content from the wood tissue; an oxidation treatment step in which the alkaline aqueous solution containing the alkali-soluble content is oxidized with H2O, a solution; A method for dyeing a wood veneer, comprising: adding a plaquen dye having -NO#1& to an aqueous solution, and dyeing the wood veneer with the aqueous solution.