JPH11170217A - Method for dyeing woody veneer and manufacture of woody decorative veneer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a transfer part having an intermediate color tone of both a summer wood and a spring wood at a boundary between the summer wood and the spring wood by charging a veneer to be dyed to a cation, and then dyeing it with anionic dye. SOLUTION: A front surface and a part extremely near the surface of a veneer are merely dyed, but not dyed to its interior, and hence a plurality of the veneers are laminated, adhered and a flitch is manufactured. A transfer part of an intermediate color having a larger density gradient than a prior art can be expressed between a dense color summer wood and a pale color spring wood via a decorative veneer obtained by thinly slicing the flitch in a direction crossed with the surface of the laminated surface. And, before dyeing it with anionic dye, its one side surface is coated with a cationic group sealer such as a sodium metasilicate or the like. The cationic group is sealed to alter the density gradients of front and rear of the veneer. Thus, the decorative veneer more similar to a woodgrain of a natural precious wood is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to housing equipment, furniture,
Wood veneer used for surface decoration of building interior materials etc.
The present invention relates to a method for dyeing a veneer (hereinafter simply referred to as a veneer) and a wood veneer veneer (hereinafter simply referred to as a veneer veneer) manufactured by the dyed veneer.

[0002]

2. Description of the Related Art A decorative veneer obtained by thinly slicing a so-called natural precious wood, which is selected from natural woods and has an excellent appearance, has been often used for surface decoration of housing equipment, furniture, building interior materials and the like. Was. Wood that deserves a reputation as a so-called precious wood is characterized not only by its color, but also by the delicate grain pattern formed by annual rings, and the design formed by the combination of color and grain pattern is highly evaluated. is there.

However, in recent years, natural precious wood resources have been depleted, and prices have risen accordingly. Therefore, instead of natural precious wood, relatively inexpensive and large-amount available wood, such as southern timber, has been replaced with a slicer or wood. As needed, bleached or bleached single veneers sliced thinly by a rotary lace and then dyed to resemble a natural precious wood have come to be used.

[0004] However, most woods, such as southern lumber, which are relatively inexpensive and can be obtained in large quantities, have large or monotonous wood grain patterns or wood grains that are not clear, and are far from the aesthetics unique to natural precious wood. Things. Therefore, simply dyeing these veneers cannot create a high-quality feel like a natural precious wood. For this reason, recently, artificial veneers obtained by dyeing raw veneers made from these inexpensive wood, laminating and bonding them in the thickness direction to form flitches, and slicing them thinly in the direction intersecting the laminating surface are obtained. Veneer veneers have come into practical use.

[0005] More specifically, raw veneers (hereinafter, also simply referred to as veneers) obtained from inexpensive timber such as southern timber are dyed in a color corresponding to the spring lumber of a natural precious wood to be expressed. Trying to obtain a wood veneer veneer very similar to a natural veneer veneer by thinly slicing flitches that are alternately laminated and adhered to the color corresponding to the lumber, in the direction crossing the lamination surface. Things. The thickness of the veneer is set with reference to the grain of the natural precious wood to be expressed. In addition, veneers made of raw materials such as Nanyang lumber should be as similar as possible to the color tone of the natural precious wood to be expressed, and in order to keep the color tone of the veneer after dyeing within a certain range,
It is common to bleach or bleach before dyeing.

However, a decorative veneer manufactured from flitch in which veneers dyed in a color corresponding to the spring wood of a natural precious wood and veneers colored in a color corresponding to the autumn wood are alternately laminated and bonded is a spring veneer. The color tone changes sharply at the boundary between the veneer of the color and the veneer of the autumn color, and the boundary between the two is clear.

However, in the decorative veneer of natural precious wood, the boundary between the spring and autumn lumbers is not so clear, and there is a transitional portion where the color tone gradually changes between them. Therefore, simply laminate veneers dyed by the usual dyeing method,
Just by slicing, it is not possible to obtain a decorative veneer with transitions like the grain of a natural precious wood.

On the other hand, instead of preparing a dyed veneer for expressing the spring wood part and a dyed veneer for expressing the autumn wood part respectively, there is also a method of manufacturing an artificial decorative veneer using one kind of dyed veneer. Are known. That is, a veneer dyed by a conventional dyeing method according to a conventional technique is dyed densely near the surface layer and the back surface layer where the dye penetrates well, and is gradually dyed thinner toward the inside. FIG. 2 schematically shows the density gradient of the grain of the veneer obtained by slicing a flitch obtained by laminating a plurality of dyed veneers, as shown in FIG. In addition to the color portions, transitions of intermediate colors are formed.

However, this difference in shading is due to the difference in penetration of the dye, and the concentration gradient is small. Therefore, depending on the above method, the difference between the spring material and natural pine, zelkova and teak may be caused. The difference in shade of the autumn wood is large, and it is not possible to express a natural grain with a clear grain. Most natural precious woods have a large difference in color tone between the spring lumber and the autumn lumber. Therefore, it is extremely difficult to obtain a decorative veneer resembling the intended natural precious wood by the above method.

When the grain of the natural precious wood is observed more closely, the transition of the intermediate color transitioning from the autumn lumber to the spring lumber is narrow, and the gradient of the density change is large, while the transition from the spring lumber to the autumn lumber is large. It can be seen that the width of the transition to the transition to the autumn is wider than the transition from the autumn to the spring and the gradient of the concentration change is small.

Since the veneer is dyed by dipping the veneer in a dye, the front and back of the veneer are dyed in the same manner. Therefore, even if this is laminated and bonded, the width of the transition from the autumn lumber to the spring lumber and the width of the transition from the spring lumber to the autumn lumber become the same, and the delicate characteristic of the natural precious wood described above. I can't express the wood grain.

As means for solving this problem,
Two inventions are described in JP-A-55-11864. According to the first invention, a dyed veneer having a concentration gradient such that the surface layer becomes darker and becomes lighter toward the center layer is produced, and one side of this veneer is scraped off to make the surface layer darker and the back surface A method of producing a veneer veneer by forming a light-colored veneer, laminating a plurality of veneer veneers through an adhesive layer so that the surface layers face the same direction, and slicing the flitch of the laminate. It is. According to a second aspect of the invention, the cutting veneer and a second dyed veneer dyed in the same color as the back surface layer of the veneer veneer are produced, and the second dyeing is performed on the back surface of the veneer with an adhesive layer. A method of obtaining a decorative veneer by laminating a plurality of veneers to form a set, laminating a plurality of the veneers via an adhesive layer such that the surface layers of the cut veneers face the same direction, and slicing the flitch of the laminate. It is.

In the above two inventions, a part of the dyed veneer is cut and cut.
Since it has to be removed, there is a disadvantage that the yield of the veneer is significantly reduced.

[0014]

SUMMARY OF THE INVENTION The present invention is to solve the above two problems by the following method. That is, the first problem is an artificial makeup veneer obtained from flitch in which dyed veneers are laminated, and natural pine, zelkova,
In a veneer with a clear grain such as teak etc., it is to form a transition portion having an intermediate color tone between the autumn lumber part and the spring lumber part at the boundary between the two parts. In the above, the width of the transition from the spring lumber to the autumn lumber is formed wider than the width of the transition from the autumn lumber to the spring lumber without lowering the yield of the veneer.

[0015]

The object of the present invention is to solve the above-mentioned problems by a method of dyeing only a portion very close to the surface layer of a veneer in dark color. That is, the method is characterized in that a veneer to be dyed is subjected to a cationization treatment and subsequently dyed with an anionic dye. The veneer to be dyed is bleached or decolored as necessary before dyeing.

When a veneer is dyed by the above-described method, it is possible to dye only the surface of the veneer and a portion very close to the surface for the following reason. In the veneer, a quaternary ammonium salt is bonded to the OH- group of the cellulose fibers on the veneer surface and in the veneer by the cationization treatment, thereby generating a + ion (cation) group. When the veneer subjected to the cation treatment is immersed in an anionic dye, the -anion group of the dye is combined with the + cationic group of the cellulose, and most of the dye compound is bonded to the veneer surface, and even into the interior of the veneer. Do not reach. Therefore, the surface of the veneer and a portion very close to the surface can be selectively dyed.

According to this method, the magnitude of the concentration gradient can be variously changed by changing various conditions such as the concentration of the anionic dye and / or the cationizing agent and the immersion time.

Since the density of the veneer dyed by the dyeing method according to the above method can be made larger than that of the dyed veneer according to the prior art, a plurality of the veneers are laminated and adhered to produce a flitch. By slicing thinly in the direction intersecting with, the boundary between the spring lumber and the autumn lumber can be blurred with a narrow width like the boundary between the autumn lumber and the spring lumber in natural precious wood.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Since the veneer dyed by the method of the present invention can blur the boundary between the spring and autumn woods with a narrow width, a plurality of veneers dyed by the above method are laminated. A glue is manufactured by gluing, and the grain of the veneer obtained by thinly slicing the flitch in a direction intersecting with the laminating surface is schematically shown, as shown in FIG. 1, at the boundary between the spring wood part and the autumn wood part. A transition is formed. The decorative veneer has a larger concentration gradient than the artificial veneer according to the prior art.

Further, as described above, in the wood of the natural precious wood, the width of the intermediate color portion transitioning from the autumn lumber to the spring lumber is larger than the width of the transition from the spring lumber to the autumn lumber. Is also narrow. In order to express this, a cationic group blocking agent is used as follows. That is, a cation group blocking agent such as sodium metasilicate is applied to one surface of the veneer after the cationization treatment, washed with water, and dyed with an anionic dye. By adjusting the coating amount and / or concentration of the cationic blocking agent, the degree of dyeing with the anionic dye can be adjusted, so that the surface coated with the cationic blocking agent is dyed more than the uncoated surface. The concentration gradient can be reduced.

A plurality of the above veneers are laminated and adhered with the surface coated with the cationic blocking agent in a fixed direction to produce a flitch, which is sliced thinly in a direction intersecting the laminating surface. As shown in (1), the width of the transition from the autumn lumber to the spring lumber is narrower than the width of the transition from the spring lumber to the autumn lumber, and a decorative veneer very similar to a natural precious wood can be obtained.

The cationizing agent is most preferably a combination of the aqueous solution of quaternary ammonium salt and caustic soda used in the following Examples. Heating can speed up the reaction.

Examples of the cationic group blocking agent include sodium metasilicate in Examples described later.

[0024]

According to the present invention, only the surface of a veneer and a portion very close to the surface are dyed, and the interior is not dyed. The decorative veneer obtained by slicing thinly makes it possible to express an intermediate color transition portion having a larger density gradient between the dark autumn material portion and the light color spring material portion than in the prior art.

Before dyeing with an anionic dye, a cationic group blocking agent such as sodium metasilicate is applied to one side to block the cationic groups, and as shown in FIG. Can be changed, so that a decorative veneer more similar to the grain of a natural precious wood can be obtained.

[0026]

[Example 1] Thickness 1.0 mm, width 120 m
m, a 4 m long Agatis veneer was bleached with an aqueous solution of hydrogen peroxide, the bleaching solution was washed with water, and then mixed with an aqueous solution of quaternary ammonium salt 100 g / l and an aqueous solution of caustic soda 10 g / l. Bath ratio 1: 2 under normal pressure
It was immersed at 0 and 96 ° C. for 60 minutes to perform cationization treatment.

Subsequently, the resultant was immersed in an aqueous solution of an anionic dye having the following composition at a room temperature of 1:30 at a bath ratio of 70 ° C. for 60 minutes and washed with water.

Breakdown of anionic dye YELLOW 0.4 g / liter RED 0.7 g / liter NAVY BLUE 0.3 g / liter Dyeing aid 3.0 cc / liter Flitch obtained by laminating and bonding a plurality of the above-mentioned dyeing veneers. Is thinly sliced in a direction intersecting the stacking plane, and the density gradient of the grain of the sliced single plate is as shown in FIG.

[Example 2] Thickness 1.0 mm, width 120
Agatis veneer having a length of 4 mm and a length of 4 m was bleached with an aqueous hydrogen peroxide solution, the bleached solution was washed with water, and then constantly mixed in an aqueous solution obtained by mixing 100 g / liter of a quaternary ammonium salt aqueous solution and 10 g / liter of caustic soda. Pressure, bath ratio 1:20,
Cation treatment was performed by immersion at 96 ° C. for 60 minutes.

Next, 16 g / m 2 of a 0.2% aqueous solution of soda metasilicate was applied to the back surface of the cationized veneer with a roll coater and washed with water. After washing with water, the veneer was immersed in an aqueous solution of an anionic dye under the same conditions as in Example 1 and dyed.

A flitch obtained by laminating and bonding a plurality of the dyed veneers so that the surface coated with the aqueous solution of soda metasilicate is oriented in a predetermined direction is thinly sliced in a direction intersecting with the laminating surface. The density gradient of the grain of the board is as shown in FIG.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a concentration gradient of a grain of artificial veneer veneer obtained by the present invention.

FIG. 2 is a schematic diagram showing a density gradient of a grain of artificial veneer veneer obtained by a conventional technique.

FIG. 3 is a schematic view showing a concentration gradient of a grain of artificial veneer veneer obtained by the present invention.

Claims (4)

[Claims] 1. A method for dyeing a wooden veneer, comprising the steps of bleaching or bleaching a wooden veneer, immersing the wooden veneer in an aqueous solution of a cationizing agent, washing with water, and immersing the veneer in an anionic dye. Method. 2. After bleaching or bleaching of a wooden veneer, the wooden veneer is immersed in an aqueous solution of a cationizing agent, washed with water, immersed in an anionic dye and dyed to laminate a plurality of veneers in the thickness direction. And producing a flitch, and thinly slicing the flitch in a direction intersecting the lamination surface. 3. A wood veneer is bleached or bleached, the wood veneer is immersed in an aqueous solution of a cationizing agent, washed with water, an aqueous solution of a cation blocking agent is applied on one surface, washed with water, and then anionic. A method for producing a wooden veneer, comprising immersing in a dye for dyeing. 4. After bleaching or bleaching the wooden veneer, immersing the wooden veneer in an aqueous solution of a cationizing agent, washing with water, applying an aqueous solution of a cationic blocking agent on one surface, washing with water, and then anionic The veneer dyed by immersion in the dye, the surface coated with the aqueous solution of the cationic blocking agent is aligned in a certain direction and a plurality of sheets are laminated and bonded in the thickness direction to produce a flitch, and the flitch is formed in a direction intersecting the laminating surface. A method for producing a veneer veneer, characterized by slicing thinly.