JPS5828303A - Method of dyeing wood veneer - 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 uniformly dyeing a wood veneer (hereinafter simply referred to as "veneer") to the inside. The purpose of this invention is to prevent the transparent coating film from shaking or smearing when overcoated with a transparent coating, and this invention relates to an improved invention disclosed in Japanese Patent Application No. 55-131093.

In other words, special request! In the invention of No. 15-131093, in the first step, a dye liquid prepared by adding a slow dyeing agent to a non-level dyeing acidic dye that has excellent bonding strength with wood and solidity is mixed with a dye solution at a low temperature of 20°C as a general dyeing method. ℃~i o'OJ) conditions to allow the dye to permeate and diffuse into the interior of the veneer while suppressing rapid wood edge staining, and in the second stage to bond the wood and dye molecules. Although it is possible to obtain a strongly dyed veneer by curing it in a temperature range, it overcomes the shortcomings of the conventional veneer dyeing method and can be done in a very simple way without high temperature and high pressure treatment. We invented an industrially useful method for dyeing wood*boards that uniformly and completely dyes the interior of the board, making it easy to match colors.

However, the mm-thick dyed veneer obtained by the method of the above invention is left as it is or is dried, then twilled again with a ridge layer using an adhesive, and then thinly sliced so that the adhesive layer has a wood grain pattern. When a thin veneer is bonded to a base material such as paperboard, cardboard, or Natori board material, and the rear wheel is overcoated with a transparent paint, clouding or crinkling may sometimes occur in the transparent paint layer. As a result, a special application was filed in 1982.
-131083 The method of the invention was improved and the method of the present invention was completed.

That is, the present invention utilizes a dye solution containing a non-level dyeing acid dye and a slow dye agent in a wood veneer dyeing method in which dye waves are permeated and diffused into wood using a reduced pressure and pressure injection method. After penetrating and diffusing into the wood veneer by maintaining the temperature at a temperature that prevents the molecules from rapidly dyeing the wood, the dye molecules are allowed to stain the wood. The most distinctive feature of the wood veneer dyeing method is that it is sprayed and condensed to wash out and remove undyed dyes, dyeing aids, and wood extract components from the wood veneer. The purpose of this method is to wash out and remove dye coloring aids or wood extract components, thereby destroying the wood quality and making the properties of the entire veneer uniform.

The present invention is described below! l! M&: m@do.

First, after various types of veneers are sealed in a container, the pressure inside the container is reduced to remove moisture, air, and other volatile substances harmful to dyeing from the veneers. Here, it is preferable that the container be a container that can be depressurized, pressurized, and heated because the dyeing conditions can be controlled mechanically and the reproducibility of dyeing is excellent.

Further, the depressurization conditions must be determined based on conditions such as the capacity of the container, the thickness and shape of the veneer, the resin, and the water content, but according to the present invention, it is usually 1 mm 1 g in mercury column.
~roomal The time ranges from 5 to 60 minutes for one problem.

In addition, if you pre-treat the veneer with warm water containing a surfactant or decolorizing bleach to remove colored components, oil, and other substances that inhibit dyeing from the wood, and then dry it, it will be easier to remove the color under reduced pressure. This is preferable because the conditions can be further relaxed and the dyeability can be improved.

In the next step, the dye liquid containing one or more non-level dyeing acid dyes and slow dyeing agents is added and mixed into the container under reduced pressure at a temperature that does not allow the dye molecules to rapidly dye the veneer. The veneer in the container is immersed in this dye solution, and then, while maintaining the temperature state, compressed air is introduced and pressurized to permeate and diffuse the dye molecules into the veneer. Here, the non-level dyeing acid dyes (non-level dyeing acidic azo dyes, non-level dyeing acidic anthraquinone dyes, non-level dyeing metal complex azo dyes) are used in the present invention because the dyed single The board is
Usually, it is used by being glued to other materials such as heat resistant adhesives, or after being subjected to processing such as painting as mentioned above, and is rarely used only for dyeing.Also, as a wood processing IH adhesive, acetic acid Water-soluble or acidic adhesives such as vinyl resins and urea resins are used, and the most commonly used paints are aruno-alkyd resin paints, in which acetone, toluene, etc. are used as solvents and strong acids are added as curing agents. has been done. Therefore, the dye must also have excellent sunlight resistance, acid resistance, water resistance, and solvent resistance, and non-level dyeing acid dyes best satisfy the above conditions.

Relaxing dyes are added to suppress rapid dyeing on wood, and use agents such as benzoic acid ester sulfonic acid, sulfonic acid salts such as soda, and higher alcohol-based and anine-based surfactants. . The appropriate amount of addition is in the range of 1 to 10 arcs based on the weight of 1L single sheet.The dye solution should be heated at a temperature that does not allow the dye molecules to dye the wood rapidly, that is, the temperature range is 20℃. The reason for injecting while maintaining the temperature at ~60°C is that if the temperature exceeds 160°C, rapid dyeing will occur on the wood surface, making it difficult to uniformly dye the interior of the veneer, and if the temperature falls below 110°C, the dye solution will This is because the dye of
It is heated to ℃ and poured into a container, and after injection, it is heated from outside the container by steam heating, electric heating, etc.

As for pressurizing conditions, it is preferable to introduce compressed air using a compressor or the like and pressurize for 30 minutes to several hours.

Next, the pressure inside the container is set to atmospheric pressure, and the veneer is removed from the container and cured to bond the dye molecules with the wood.

The sojourn period is selected depending on the temperature conditions, but according to the present invention, the temperature range is from go°C to 130°C, preferably from 60°C to 1'sto
The conditions may be as long as the temperature is 1 ON for about 48 hours. At temperatures below 0°C, a very long curing time is required, which is inefficient.

On the other hand, if the temperature exceeds 180°C, the curing time can be shortened, but the veneer will become brittle (which is not a good thing).Please note that the dye solution inside the container can be taken out of the container and used again. There is.

Next, water vapor is blown onto the surface of the dyed veneer to condense the water and vapor, and undyed dyes, dyeing aids, wood extract components, etc. in the wood veneer are washed out and removed. This is because if the above-mentioned substances remain in the veneer, when a transparent paint or the like is applied to the surface of the veneer, the above-mentioned substances may dissolve into the coating film and cause clouding or stains. The method of spraying water vapor is to spray high-temperature steam of about 100°C to 100°C onto the dyed veneer surface of the fence, or by blowing high-temperature steam from the wood end surface of the accumulated dyed veneer. You can also wash it out.

After the above process, the veneer is heated and dried to an equilibrium moisture content (approximately 1 g 1 to 1 g 0), which further promotes the bonding between dye molecules and wood, resulting in a dyed veneer with better toughness. .

The present invention is based on the above-described dyeing method and has the effects listed below.

(1) The inside of the veneer can be dyed uniformly.

(2) Since high-temperature treatment is not performed, it is possible to dye the wood in pale colors without degrading the quality of the wood. .

(Tsukasa) Since the dye solution can be reused, it is economical and does not cause pollution problems.

(4) Table ml of veneer for treatment with high temperature steam
Even if transparent paint is applied to the surface, there will be no influence from residual dyes or wood extracts, and no clouding or staining will occur.

(5) Because the process and equipment are simple, veneer dyeing can be carried out efficiently and with low friction.

Next, examples of the present invention will be shown below.

Example (1) Depressurize, pressurize and pressurize a container with a capacity of 1') and thoroughly dry it (1 size) LOmmX (width) sommX (length) Jij5QO
Insert 400 Cao Feng agathis veneers and reduce the pressure inside the container to 5 mm H6 of mercury to remove air in the veneers. Next, the metal complex dyes mu, myown, and II were mixed with lO
Kg and metal complex azo dye mixture Ota, or&m (8,8
M is 5r+; and the slow dyeing agent is 7j Runsuru Hon-san Soda! ! Prepare a dye solution maintained at room temperature by dissolving OIC (OIC) in 1 ton of water, place it in a vacuum container, immerse the veneer in the dye solution, and introduce compressed air to increase the pressure. The veneer was heated to 10 kg/- for 1 hour to allow the veneer to contain dye 111. Next, the pressure inside the container was set to atmospheric pressure, and the veneer was taken out from the container and covered with a polypropylene film. t) Leave the veneer to cure for 44 hours indoors, dye evenly to the inside, then dye each veneer one by one for 110~
The veneer was passed through pressurized high-temperature steam at 130°C to wash out excess dyes and wood extracts, and the desired brown agathis veneer was obtained.Example (2) Vacuum pressure with a capacity of 2 tons, m Pressure and heat into 4 containers (thick)
α? mW x (width) 6 @IO x (Nagato) 2700
Insert a 2-row single HIsoo cane, which is made from South Sea wood, and reduce the pressure in the container to mercury to remove moisture in the veneer, air in the cell membrane, and volatile substances in the pond water material. Pressure is applied for 30 minutes. Then, the metal complex azo dye 0, 1L, Green, @O is used as IK electric and j, 0 is used as metal complex salt azo dye,
g and a benzoic acid ester sulfonate sodium activator as a slowing dye at 15K (L5) water (liquid 1140℃#).
Prepare the dye solution dissolved in SO'a), inject it into the evacuated container mentioned above, and immerse each sheet in the dye solution. Pressure 3 k (
/cj-4k@/- and keep the liquid temperature between 50℃ and 60℃ for 1 hour to allow the dye molecules to permeate and diffuse into the wood. The pressure inside the container was set to atmospheric pressure, and the veneer was taken out from the container, wrapped in a water-impermeable polyethylene sheet, and left in a room at 50°C to 40°C for 36 hours. The veneer is inserted into the laminated box and heated with high-temperature steam at a temperature of 130°C to 10°C to wash away excess dye and wood extracts, and the desired yellow-brown color is evenly dyed to the inside. I got a veneer.

Example (3) In the same container as the actual example (g) (thickness) LOmmX (width)
500mm x (length) 'l D 400 Chinese veneers of OOmwa were inserted, and the pressure inside the container was reduced to 6 kg of mercury to remove air and moisture in the veneers. ,! Ila, h, ioy to 30, naphthalene sodium sulfate (relaxing dye) lokg to 1) n.
A dye solution was prepared by dissolving it in water and keeping it at 40°C.The pressure was reduced as described above, and the veneer was immersed in the dye solution.The pressure was increased to 51 kg/ai by introducing compressed air. 1
After standing for 4 hours, the dye solution was absorbed into the veneer. Next, the pressure inside the container was set to atmospheric pressure, and the veneers were taken out from the container and cured for 16 hours in a heating chamber at 110°C. By passing it through the air, the excess dye and wood extract components in the veneer were washed out, and the desired black stained Chinese veneer was obtained.

Applicant Danya Sangyo Co., Ltd. Representative Hirotada Dan Tani

Claims (1)

[Scope of Claims] 1) A dye in which a non-uniform acid dye and a slow dye are added and blended in a wood veneer dyeing method in which a dye solution is permeated and diffused into wood using a reduced pressure or pressurized injection method. The liquid is maintained at a temperature that does not allow the dye molecules to dye the wood quickly, and after penetrating and diffusing into the wood veneer, it is cured and the dye molecules are dyed onto the wood.1. High temperature steam is applied to the surface of the wood veneer. A dyeing method for wood veneers that is characterized by spraying and condensing to wash out and remove undyed dyes, dyeing aids, wood extracts, etc. from the wood veneers. 2) The method for dyeing wood veneer according to claim 1, wherein the temperature of the dye solution is such that the dye molecules of aotyQaog do not dye the wood rapidly. 3) The method for dyeing wood veneer according to claim 1 or ts2, wherein the curing temperature after injecting the dye solution into the wood and allowing it to penetrate and diffuse is in the range of 20°C to 130°C.