JP2002512137A - Through-colored wood element and method of manufacturing through-colored wood element - Google Patents

Abstract

  (57) [Summary] A process for the production of a through-colored wood element, wherein the wood element is pressed hydrostatically in a first stage at a pressure of more than 800 bar, preferably more than 1000 bar, after which the pressure is removed and then the second In a stage the wood elements are placed in a liquid bath containing the dissolved colorant. The invention also relates to a through-colored wood element.

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a method for producing thread-colored wood elements, in particular sawn wood products, and to thread-colored wood elements.

[0002] Here, "through-coloured" means that the wood element is homogeneously colored or colored throughout the wood. Thus, the sawed surface of the wood element will be colored or tinted regardless of the direction in which the wood is sawed or cut. Hereinafter, the phrase “through colored” is used in this sense.

[0003] Colored and colored wood products wear over time. Such abrasions, holes, scratches and similar damage on wood products are particularly noticeable as they expose solid wood located under the colored or tinted surface. The surface to be recolored or recolored requires a large amount of preliminary work, such as sanding, etc., which is very time consuming.
The actual coloring step is also very time-consuming. These problems are solved by the present invention with the aid of a method of coloring through wood as defined above. Scratches, holes, scars and wear in and on the wood are not noticeable in this case. In addition, the wood can be sanded or processed while retaining the same color throughout. The through-coloring step is also less cumbersome than the manually performed coloring or coloring step. This gives significant benefits. Examples of areas where such benefits can be provided are floor coverings and table tops. Thus, the present invention allows for the production of through-colored wooden flooring and table tops that require only sanding and then treatment with a suitable oil or varnish when showing signs of wear. Another area of use is found on the wooden handle of tableware. Colored or colored wooden tableware washed in a dishwasher quickly becomes ugly as a result of tinted wear in the dishwasher. This problem is solved when using the through-colored wood according to the invention. Because of the fact that the wood is through-colored, no colored surface is damaged.
You can now make wooden handles for tableware that can withstand dishwashing.

[0004] Swedish patent application SE 95500689-6 describes a method for producing impregnated wood products. This method is preferred in the first stage of production to be greater than 800 bar, preferably 1000 bar.
It involves isostatically pressing the wood element or wood stock at a pressure greater than bar, with a so-called Quintus press or with the aid of other suitable pressing methods.
The degree of compression experienced by the wood will depend on the degree of dryness, fiber orientation, hardness and other properties of the wood. Typically, this compression will result in a reduction in one cross-sectional dimension between 20-50%. Thereby, the cells in the elements are pressed together. The load on the wood element is then removed.

In a second step, the wood element is placed in a bath containing an impregnating agent, whereby the wood element enters the cells and gradually expands as a result of the liquid absorbed by the cells. The liquid penetrates the cells so as to obtain complete impregnation throughout the wood element. The extent to which the wood element expands will depend in particular on the material of the wood element and its residence time in the bath.
Apparent swelling usually occurs within a few hours, and in some instances the material returns to its initial shape within this time interval. Suitable saturants are liquid flame retardants, liquid germicides and adhesives.

[0006] The first two stages can be supplemented by a third stage, in which the wood element is 80
It is hydrostatically compressed again at a pressure greater than 0 bar, preferably greater than 1000 bar, resulting in a flame-retardant, germicidal and, when an adhesive is used, a rigid element resistant to deformation.

[0007] The aforementioned pressing method is also described in Swedish Patent Application 9303821-4, which increases the quality of low quality wood by providing a harder end product. For example, pine can be as hard as oak, and oak can be as hard as twice its natural hardness. Swedish patent application 9500
According to 689-6, it has been found that this pressing method can impregnate wood that could not previously be impregnated. Such impregnation can be achieved with wood products as large as several square meters.

Previously, it was not possible to color through wood. However, it has surprisingly been found that the invention claimed in this application allows the wood to be colored through by placing the wood in a color bath after the first isostatic pressing step. The color penetrates into the wood, which can then be dried in the usual way and optionally pressed again. This color penetration results in the wood being through colored. In addition, all the benefits of hardwood can be obtained by further pressing the wood with SE9303821-4 after coloring through the wood.

According to the method of the invention, the wood element is pressed hydrostatically in a first stage at a pressure of more than 800 bar, preferably more than 1000 bar, in a so-called Quintus press or by any other suitable pressing method, whereby the said element is Compress the wood cells inside. This method is described in SE9303821-4. In the second stage,
The wood element is placed in a color bath containing, for example, water and a water-soluble colorant. When the pressure-treated wood comes into contact with water, the wood swells and draws water into it. Cellulose and water in wood are both polar, so that water is easily absorbed by wood. Colorants are also polar and thus entrain water in the wood cells. The colorants have a molecular size or fineness that allows them to penetrate into wood cells. The colorant should not be too polar. This would stop it at the surface of the wood instead of penetrating it. This also applies when the molecular size of the colorant is too large to penetrate the wood. The molecular size and polarity of the colorant will vary slightly depending on the type of wood involved. One skilled in the art will be able to determine suitable colorants experimentally. This is accomplished by isostatically pressing the wood element of the wood concerned and then coloring it with various colorants in combination with a solvent, for example water.

[0010] The solvent used will be that absorbed by the wood. Water is a suitable solvent. Another suitable solvent is linseed oil, which has good permeability and wettability due to its small molecules. The colorant should be soluble in the solvent, polar enough to entrain the solvent when it is absorbed into the wood, and have a molecular size that ensures that it has "room" to entrain the solvent in the wood It is. In the present invention, azo dyes are suitable coloring agents. Azo dye monomers, dimers or polymers are applicable, depending on the molecular size of the azo dye or colorant and the choice of wood. The colorant should also have the necessary polarity to allow it to enter the wood. One skilled in the art can determine which colorant will penetrate into the wood with which solvent.

Wood that can be colored according to the present invention includes hardwood or deciduous wood such as poplar and birch, and softwood or softwood such as pine and pine (red wood). The first stage, in which the wood is isostatically pressed, allows a large number of different types of wood to be colored through the invention.

[0012] A number of tests have been performed with poplar and toucan. It is product number 102051
Herdins Aekt made by mixing azo dye and sodium chloride according to the instructions of genuine stain product in powder form obtained from Herdins Faergverk AB with
Colored through with a Bets. These tests will be described below.

The present invention will be described in more detail with reference to the following examples. The process of the present invention comprises in a first step, isostatically pressing the wood element at a pressure of more than 800 bar, preferably more than 1000 bar, by means of a so-called Quintus press or other suitable pressing method, wherein the wood element is Wood cells are compressed. The wood element is then released from the load. In a second step, the wood element is placed in a liquid bath containing a colorant dissolved in a solvent such as water, whereby water and the colorant are absorbed by the wood element. The colorant should have a molecular size that allows it to penetrate the wood element and has a polarity that allows it to penetrate the wood with water. Water and colorants move into the wood as it swells. This occurs over several hours and can be performed at room temperature or at elevated temperatures up to 100 ° C. The threading process proceeds more rapidly at temperatures above room temperature. The colorant-containing water penetrates into the wood element as the wood swells, thereby providing a through-colored wood element.

[0014] The wood element is then dried by conventional methods.

[0015] Alternatively, the wood element can be tinted through a conventional pressure impregnation method.

It has also been found that it can be colored through wet wood or raw wood. In the first stage of isostatic pressing of the log at a pressure greater than 800 bar, preferably greater than 1000 bar, the lumen is opened or some property of the wood changes. The opened lumen will be able to absorb colorants and solvents at a later stage. This causes the wood element to be colored through. At a later stage, the wood element is placed in the room and the colorant and solvent are added. This latter stage can be carried out by a conventional pressure impregnation process under reduced pressure and / or pressure. This step is necessary because the wood retains a very high sap content. The pressurizing and / or depressurizing steps allow the sap already contained in the wood to be exchanged for colorants and solvents.

[0017] It is even possible to color through wet or woodwood, which is known to be impossible to impregnate.

[0018] Following the coloring through the wood element, said element can be isostatically pressed in a third stage at least once again at a pressure of more than 800 bar, preferably more than 1000 bar. This results in a through-colored wood with hardwood hardness.

The wood through coloring step can also possibly be combined with the impregnation step described in SE 95500689-6, which allows the incorporation of a flame retardant, an antimicrobial agent or an adhesive into the through colored wood element.

The present invention also relates to a through-colored wood element which has been through-colored by the method described above.

Example 1 A piece of poplar wood measuring 7 × 4.5 × 15.5 cm was cut from a Quintus press (SE
Pressed (by the method described in 9303821-4). The wood was pressed at 1300 bar for 2 minutes at room temperature.

The coloring bath was prepared by mixing ERD in HERDINS AEKTA BETS, No. 59, powder form with water according to the packaging guidelines (no ammonia). The solution was brought to boiling point and a piece of pressurized wood was then placed in the solution where it was held for about 2 hours while boiling the solution, after which the wood was removed and dried. The wood was then sawn into two, from which it could be seen that the wood pieces were tinted.

Example 2 A piece of 4 × 4 × 5 cm braided wood was pressed in a second test in the same manner as described in Example 1. The coloring bath was prepared in the same way as described in Example 1 and the wood was HERD
INS AEKTA BETS, No. 51, red, was tinted in the same manner except that it was used instead. The wood was removed from the bath, dried, and then sawed into two, from which it could be seen that the wood was colored through.

The present invention provides a unique method of through-colored wood with a wide area of use. Virtually all types of wood can be treated according to the invention. In addition, the present invention can be applied to manufacture through-hardened wood of enhanced hardness. The through coloring process is not as laborious as painting or coloring wood by hand. As mentioned above, the areas of use include floor coverings and table tops, as well as wooden panels, wooden stairs, kitchen elements, glued wooden beams, shafts, sports equipment and the like. When such wood products and articles are damaged and worn, their surfaces can be sanded to expose a new, defect-free colored surface that does not require recoloring. Damage and wear to the surface of the wood will not be as noticeable as it would otherwise because the wood would be tinted through and thus the "white" wood would not be visible through the damaged surface. It is also possible to make tableware with colored wooden handles that can withstand washing in a dishwasher.

[Procedural Amendment] Submission of translation of Article 34 Amendment of the Patent Cooperation Treaty

[Submission date] May 25, 2000 (2000.5.25)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

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Claims (7)

[Claims] 1. A process for the production of a through-coloured wood element, said element being isostatically pressed in a first stage at a pressure of more than 800 bar, preferably more than 1000 bar, after which the pressure is removed The method of claim 1, wherein the wood element is placed in a liquid bath containing a solvent and a colorant dissolved therein in a second step, wherein the solvent and colorant are absorbed by the element. 2. The method according to claim 1, wherein the wood element is greater than 800 bar, preferably 1000 b
The method according to claim 1, wherein the pressing is at least once more isostatically at a pressure greater than ar. 3. The method according to claim 1, wherein an aqueous solvent is used in the liquid bath. 4. The process as claimed in claim 1, wherein a colorant having a molecular size which allows it to penetrate into the wood element is used. 5. The process as claimed in claim 1, wherein a polar coloring agent is used which allows the wood element to penetrate. 6. The method according to claim 1, wherein a coloring agent containing an azo dye is used.
The method according to any one of claims 1 to 5. 7. A through-colored wood element, characterized in that the wood element is through-colored according to the method of claims 1 to 6.