ES2311329A1 - Process of dyeing by immersion of wooden plate. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Process of dipping by veneer of wood, where said sheet is prepared for immersion in a cage of blued stainless steel, placing it between nets, and submerging it in a tank in decalcified water at 60ºc, and adding hydrogen peroxide, sodium hydroxide, a stabilizer of oxygenated water and a sequestrant. The rinse is carried out with acetic acid, maintaining the ph at 7. The water is emptied from the tank and filled again with decalcified water, and adding some pigments at this time, which will vary in percentage and color depending on the desired result. . In addition, sodium hydrosulphite, antifoam, sodium hydroxide and a sequestrant are added. The tank is again emptied and filled with decalcified water, and oxygenated water is added for its oxygenation, soap and acetic acid to fix the color, in separate stages, allowing it to drain and passing through a final dryer. (Machine-translation by Google Translate, not legally binding)

Description

Tincture process by immersion of sheet metal wood.

Object of the invention

The present invention deals with a process of immersion stained wood veneer used for dyed pigments, said wood veneer acquiring the properties of resistance to the effects of heat and lightning ultraviolet, also getting a total penetration in the wood.

Background of the invention

At present, the conventional way of Stained by immersion of wood veneer uses acid dyes. This process, which has been carried out since the tinting of the wood veneers industrially and with color penetration in mass, for about 50 years, offers a relatively product easy, good penetration of mass color, but of a poor or minimal resistance to ultraviolet rays and heat, depending of the type of wood or the desired color.

In the process, to date, they are used only acid dyes to dye the sheet, it was virtually impossible to dye the veneer with pigments, since the color and color penetration could not be controlled mass. In the process described below you get control the color and penetration of it in total mass using pigments

Environmental laws are very strict in the use of solvent-based varnishes, and most processes industrialists have been forced to opt for the use of water-based varnishes. This change has caused the need for find a treatment for wood whatever invariable or virtually invariable against the effects of lightning UV and heat. For example, in the industry of automotive is very important that the wood has a treatment adequate and do not vary their properties, as required by the manufacturers, because they are, for now, the users of this product that best know and control with standards and dimensions this phenomenon or need

Description of the invention

The invention is about the dyeing process by immersion of the wood veneer, described in continuation.

The veneer is prepared for the process of tinted by introducing it in a stainless steel cage, placing it between nets and immersing it in the dye tank. This tank is filled with water previously filtered at 60 ° C, with a 0.2% sequestrant, a 0.6% hydrogen peroxide stabilizer, and then hydrogen peroxide of 200 volumes at 3% is introduced, and sodium hydroxide in 0.3% by volume of solution. He used sequestrant is preferably Verolan, a sequestrant of metals that wood can carry, which also helps eliminate the lime that the wood can contribute to the dissolution. The sheet is will keep introduced into the solution for an approximate time 3 hours, raising the temperature to 90 ° C.

After the indicated time, the sheet with acetic acid for about 30 minutes, at 60 ° C, controlling the neutral pH at 7 using a pH controller arranged in the tank.

Once the rinse is finished, the water is emptied Cuba, and refills again with clean water, taking to 60 ° C, the 0.1% sequestrant and 0.1% equalizer are introduced, and include suitable dyes according to the color that is want to get. Depending on the nature or class of wood veneer, The color percentages of each dye will vary. In addition to adding dyes, 1.8% sodium hydrosulfite is added to the bath volume of solution, 10 ml antifoam, sodium hydroxide in a 1.2% by volume of solution and raising the temperature to 90 ° C. This phase will last approximately three hours. Once finished The tank will be emptied.

Then the tank is refilled with clean water, and 1% hydrogen peroxide is added by volume of Dissolution for oxygenation. This stage will take place at 60 ° C for 30 minutes

The tank is emptied again and filled again with clean water, add 10 ml soap, keeping the water at 60 ° C for 30 minutes.

Again the tank is emptied and filled with water clean to which 0.1% acetic acid will be added to fix the color. It stays that way for 30 minutes at 60 ° C.

Once the tinting process is finished, Will check the color and mass penetration. It will drain for 6 hours and it will pass through the wood veneer dryer to a speed of 30 meters per minute, and at a temperature of 90 ° C. With this last drying, the sheet is ready for shipment.

The important thing about this process is the fact that you can get to stain the wood veneer getting a total penetration into the mass of the sheet.

Description of the drawings

To complete the description that is being performing and in order to help a better understanding of the characteristics of the invention, according to a preferred example of the practical realization of it, is accompanied as part member of that description, a set of drawings where with illustrative and non-limiting nature, what has been represented next:

Figure 1 shows a diagram of the plant of stained wood veneer. The double line represents the water supply, which goes both to the dye tank (2) going through a water softener (15), such as the steam boiler for heating the Cuba (2). The dashed line indicates the path followed by the wood veneer The simple solid line indicates the supply of the different components, as well as the emptying line (16).

Preferred Embodiment of the Invention

The process described below use pigments for staining wood veneer, and not as so far acid dyes, with the problems already mentioned that present to ultraviolet rays and heat.

Looking at Figure 1, we can see the cage (1) of blued stainless steel, in which the wood is prepared, and that subsequently dipped into the tank (2) dye, which has a pH controller (8). To fill the tank (2), there is a water conduction that always passes through a water softener (15), providing clean decalcified water for the process. A steam boiler (14) is responsible for bringing the tank (2) dye to the desired temperature at each stage of the process, as well as the Drying of the sheet. Once all the elements of each one have been added one of the phases of the process, the plate of the tank (2) is removed from dye and go through a dryer (13), to leave it ready for expedition. The products used are added in the stage appropriate, according to the process described below, comprising these products:

- Hydrogen peroxide (3)

- Sodium hydroxide (4)

- Kidnapper (5)

- Hydrogen peroxide stabilizer (6)

- Sodium Hydrosulfite (10)

- Acetic acid (7)

- Soap (12)

- Antifoam (11)

- Equalizer (17)

Having seen the above, to begin with the process, the veneer is prepared for tinting in a cage (1) of blued stainless steel, placing it between nets, and following Then the following process:

(to)

Wood veneer immersion caged inside a tank (2) of dye in decalcified water a 60 ° C

(b)

sequestrant addition (5) 0.2%, a 0.6% hydrogen peroxide stabilizer (6), introducing then hydrogen peroxide (3) of 200 volumes at 3%, and hydroxide of sodium (4) in 0.3% by volume of solution (usually Verolan), and keeping the sheet submerged like this for 3 hours raising the temperature to 90 ° C.

(C)

rinse the sheet with acetic acid (7) for 30 minutes and at 60 ° C, keeping the pH neutral at 7.

(d)

empty the water from the tank (2) and refill with decalcified water, taking it at 60 ° C, and adding at this time the 0.1% sequestrant and the equalizer (17) to 0.1%, and pigments (9), which will vary in percentage and color depending on the result you want to obtain.

(and)

add sodium hydrosulfite to the bath (10) in 1.8% by volume of solution, 10 ml of antifoam (11), sodium hydroxide (4) in 1.2% by volume of solution, keeping the pigments (9) of stage (d) together with these elements for 3 hours at 90 ° C.

(F)

be empty the tank (2) again and fill it with disqualified water, and hydrogen peroxide (6) in 1% by volume of solution is added to its oxygenation, performing this stage at 60 ° C for 30 minutes

(g)

change the water again and add 10 ml of soap (12), keeping it like this for 30 minutes at 60 ° C

(h)

change the water again and add acetic acid (7) in 0.1% by volume of solution to fix the color, keeping it at 60 ° C for 30 minutes.

(i)

be let drain for 6 hours, and go through the dryer (13) of veneer at 30 meters per minute, and at 90 ° C, leaving the veneer ready for issue

In step (d) of the process, the pigments (9) used are Indanthren®, because although there are really few existing pigments in the market, these are the only ones that They work with wood.

Claims (2)

1. Dyeing process by immersion of wood veneer, where said veneer is prepared for immersion in a stainless steel cage, placing it between nets, characterized in that it comprises the following stages

(to)

Wood veneer immersion caged inside a tank (2) of dye in decalcified water a 60 ° C

(b)

sequestrant addition (5) 0.2%, a stabilizer (6) of hydrogen peroxide by 0.6%, and introducing then the hydrogen peroxide (3) of 200 volumes at 3%, hydroxide of sodium (4) in 0.3% by volume of solution, and maintaining the sheet submerged for 3 hours at 90 ° C.

(C)

rinse the sheet with acetic acid (7) for 30 minutes and at 60 ° C, keeping the pH neutral at 7.

(d)

empty the water from the tank (2) and refill with decalcified water, bringing it to 90 ° C, and adding at this time the 0.1% sequestrant and the equalizer (17) to 0.1%, and pigments (9), which will vary in percentage and color depending on the result you want to obtain.

(and)

add sodium hydrosulfite to the bath (10) in 1.8% by volume of solution, 10 ml of antifoam (11), sodium hydroxide (4) in 1.2% by volume of solution, keeping the pigments (9) of stage (d) together with these elements for 3 hours at 90 ° C.

(F)

be empty the tank (2) again and fill it with disqualified water, and hydrogen peroxide (3) in 1% by volume of solution is added to its oxygenation, performing this stage at 60 ° C for 30 minutes

(g)

change the water again and add 10 ml of soap (12), keeping it like this for 30 minutes at 60 ° C

(h)

change the water again and add acetic acid (7) in 0.1% by volume of solution to fix the color, keeping it at 60 ° C for 30 minutes.

(i)

be let drain for 6 hours, and go through the dryer (13) of veneer at 30 meters per minute, and at 90 ° C, leaving the veneer ready for issue

2. Process of dyeing by immersion of wood veneer, wherein said veneer is prepared for immersion in a cage of stainless steel, plated, placing it between nets, according to claim 1, characterized in that the pigments (9) used in step (d) of the procedure are Indanthren®.