JP2000238008A - Artificial decorative veneer and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To represent the high class feeling of a natural precious wood by a method wherein the local thickness change is produced by giving the artificially predetermined thickness unevenness at the predetermined thickness unevenness at the predetermined portion of a stockveneer obtained wit a slicer by cutting, grinding, pressing or the like. SOLUTION: Artificially thickness unevenness is given to the predetermined portion of a stock veneer by cutting, grinding, compressing with a press or the like so as to remarkably represent the change in the width of wood grain for recognition. When a knat or the like is wanted to be represented in an artificial wooden decorative veneer, the bending of the stock veneer in a small radious of curvatyre in the neighborhood of the knar is inevitable at the lamination and bonding of the veneer breakage of the stock veneer develop, the difficulty in the lamination, and bonding follows, the thickness of the predetermined portion of the stock veneer is properly adjusted, under the state that an adhesive is applied on the obtained stock veneer A and cushioning materials and arranged above and below the bundle of laminated stock veneer due to its thickness unevenness, the bundle is clamped by the high pressure with a pressing machine. As a result, the width of wood grain changes from the butt end to the top end of a tree as occuring in the decorative veneer of a natural precious wood, resulting in allowing to enhance its commercial value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION Various decorative boards are used for surface decoration of housing equipment, furniture, building interior materials and the like. The present invention relates to an artificial wood veneer veneer used for manufacturing the decorative board.

[0002]

2. Description of the Related Art A wooden 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, interior materials for buildings and the like. Was. Wood that deserves evaluation 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 woods, relatively inexpensive and large-amount available wood such as southern timber has been replaced by slicers or wood. Wood veneers obtained by thinly slicing with a rotary lace are bleached or bleached if necessary, and then dyed to resemble a natural precious wood.

However, relatively inexpensive and large quantities of timber, such as southern timber, have large or monotonous grain patterns, or most of them do not have a clear grain. It is far from aesthetic. Therefore, simply dyeing a veneer obtained from these woods in accordance with the color of the natural precious wood to be expressed cannot give a sense of quality like a natural precious wood. for that reason,
Recently, artificial veneers obtained by dyeing wood veneer veneers made from these inexpensive timber, laminating and gluing them in the thickness direction to form flitches, and thinly slicing them in the direction intersecting the laminating plane. Wooden veneer veneers (hereinafter also referred to as artificial veneer veneers or simply veneers) have come into practical use.

That is, a veneer veneer obtained from inexpensive timber such as southern timber is dyed in a color corresponding to the spring lumber of a natural precious wood to be expressed and in a color corresponding to the autumn lumber. By thinly slicing flitches that are alternately stacked and adhered in the direction that intersects the stacking surface,
It is intended to obtain a wooden veneer veneer that is very similar to the veneer veneer of natural precious wood. The thickness of the raw veneer is usually 0.5 to 2 m
m is used, and is set with reference to the grain width of the natural precious wood to be expressed. For example, perpendicular to the stacking direction (90
When slicing at the intersection angle of (degree), prepare a raw veneer having a thickness corresponding to the width of the grain of the natural precious wood to be used for expression. When slicing at an angle of 90 degrees or less, not perpendicular to the laminating direction, a raw material veneer thinner than the above is prepared according to the crossing angle.

When the grain of the natural precious wood veneer to be expressed is a straight grain, the flitch used for this purpose may be formed by laminating and bonding the raw material veneers constituting the flat in a flat state. When the wood grain of the natural precious wood veneer is a wood grain, the raw material veneers may be laminated so as to have a concave curved surface, or flitches laminated and bonded flat may be provided with an intersection angle in the length direction. A device such as slicing is required.

[0007]

With the above method,
An artificial wood veneer can be obtained that is very similar to natural wood. However, when observing the grain of the artificial veneer in detail, it can be seen that the grain differs from the grain of the natural precious wood in the following points. In the artificial veneer veneer produced by the above method, the raw material veneer has almost no thickness unevenness, so that the grain width is almost constant. In particular, in the case of a straight grain pattern, the strip-shaped spring and autumn wood parts appearing in the grain are almost straight, have little change like a geometric pattern, and lack a sense of quality as compared with a natural precious wood veneer. Also, as shown in the schematic diagram of FIG. 2, even when the raw material veneers are laminated while being slightly bent, since the thickness of each raw material veneer is uniform from the original opening to the terminal end, the variation is also poor. Inferior to board.

On the other hand, the grain of the natural precious wood, as shown in the schematic diagram of FIG. 3, is that the width of the spring lumber and the length of the autumn lumber each slightly increase or decrease from the original mouth to the end. And often meanders. Furthermore, in the vicinity of a node or the like, the thickness is locally extremely changed. Artificial veneer veneers are highly valued in the market by being as close to natural precious wood as possible, and are considered to be of high quality. The value of the product does not increase because the luxury of the precious wood cannot be fully expressed. The present invention is intended to solve the above-mentioned disadvantages in the artificial veneer veneer.

[0009]

The present invention has solved the above-mentioned problems by the following method. That is, before a single veneer plate obtained by slicing relatively inexpensive wood such as a southern timber is laminated and bonded in a flitch, thickness unevenness is artificially imparted. Fig. 1 shows that the raw material veneer constituting the grain of the spring wood part of light color is made uneven in thickness, and the raw material veneer constituting the autumn wood part is made of dark colored raw veneer without unevenness in thickness. It is a schematic diagram of flitch alternately laminated and adhered. As shown in FIG. 1, a schematic diagram of a veneer obtained by slicing a flitch using a veneer veneer obtained by applying unevenness to the thickness of the spring part is shown in FIG.
Shown in In FIG. 1, the thickness of the raw veneer constituting the grain of the spring lumber in the pale color is uneven, and the thickness of the raw veneer constituting the autumn lumber is not applied. Thickness unevenness may be applied, or thickness unevenness may be applied to both raw veneers constituting the spring material portion and the autumn material portion.

In order to artificially impart thickness unevenness to the raw material veneer, a method of cutting, grinding, or compressing a predetermined portion of the sliced raw material veneer by an appropriate thickness can be used. Slicing a flitch manufactured by a method commonly used in the prior art with a slicer may cause some thickness unevenness,
Usually, the range of the thickness unevenness is 10% or less of the original thickness. Further, as described later, when uneven thickness occurs in the sliced raw material veneer, a flitch portion corresponding to the uneven thickness portion becomes an uneven surface. That is, the flitch portion obtained by slicing a thick veneer is gradually dented, and when the dent becomes large, the thickness of the next sliced veneer becomes conversely thin.

Therefore, it is not only difficult to utilize the thickness unevenness that occurs accidentally during slicing, but also the thickness unevenness is at most about 10% of the original thickness, so that even if this is used, it can hardly be visually observed. Only to the extent can the grain width be varied. Of course, it is impossible to change the grain width of the intended predetermined portion on the surface of the manufactured artificial veneer veneer.

On the other hand, when slicing with a slicer, it is also possible to provide the raw material veneer with thickness unevenness by setting a cutting blade of the slicer so as to cause a large thickness unevenness. However, even if such a means is used, the thickly sliced flitch portion is gradually dented as described above, so that at most about 10 flitches cannot be produced from one flitch. For example, an average thickness of 1.0
mm, the central part is 0.7 mm, and when trying to slice a raw material veneer that is thinner than the other parts, even if the slicer cutting blade is set and sliced in such a way, when 10 slices are sliced, both ends of the flitch Is 3mm compared to the central part
Since the thickness becomes thin, the flitch surface in contact with the slice blade becomes convex, and cutting cannot be performed unless the slicer blade is set again so as to conform to the convex surface.

Therefore, in the present invention, a predetermined thickness unevenness is artificially imparted to a predetermined portion of the raw material veneer obtained by the slicer by any of the above-mentioned means. The artificial veneer veneer is manufactured by slicing a flitch obtained by laminating and adhering the veneer veneer in the thickness direction of the veneer veneer. In order to impart a change to the grain width of a predetermined portion of the surface of the artificial veneer veneer, based on the intended predetermined design, the position of the portion where the thickness of the raw veneer should be reduced before lamination and the predetermined position A predetermined thickness to be reduced in a portion is determined, and raw material veneers having a reduced thickness in the portion are laminated and adhered in the thickness direction according to a predetermined lamination order to obtain a flitch.

As a method of laminating and bonding, a conventional technique of applying and laminating an adhesive to raw material veneers and pressing the stacked bundle of raw material veneers from above and below by a press machine may be applied. Since the plates have uneven thickness, the thickness of the stacked raw material veneers is also uneven. For this reason, pressure unevenness occurs at the time of pressing, so that it is necessary to arrange cushioning materials such as rubber plates above and below the stacked bundle, and to press at a higher pressure than in the case of laminating and bonding according to the conventional technology.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a method for artificially imparting thickness unevenness to a veneer veneer includes, as described above, a method of cutting a predetermined portion of a veneer veneer, a method of grinding,
There is a method of compressing with a press, but as a method of cutting, a planar that can smoothly cut the surface of wood with a rotary blade can be used. In this case, the cutting blade must be lowered at a predetermined portion of the raw material veneer to be reduced in thickness, or the platen must be raised so that only the predetermined portion is cut by a predetermined thickness.

When flowing the material at a high speed, it is difficult to perform the above adjustment by manual operation. Therefore, it is necessary to provide a mark at a predetermined position of the raw material veneer, read the position of the mark with a sensor, and automatically lower the cutting blade. For example, if the material feed speed of the planar is V and the thickness of a portion from a position at a predetermined distance L to L ′ measured from the front end of the raw material veneer is to be thinned by tmm,
The front end of the raw material veneer put into the planar is detected by a sensor, and after the detection, the cutting blade of the planar is lowered by tmm during the time period of L / V to L '/ V, or the level of the platen is reduced by tmm.
Just raise it.

Further, since the planar mechanism of a normal mechanism is based on the premise that a plate holding device or the like cuts a plate having a thickness of 1 mm or more, an accurate thickness is required for a single material plate having a thickness of 0.5 mm or less. It is expected that it will be difficult to scrape off. In such a case, the raw material veneer may be fixed on a template having a convex portion having a predetermined shape corresponding to the concave portion to be provided to the raw material veneer, and may be planarized.

In the case of the grinding method described above, when a grinder such as a wide belt sander or a drum sander used for ordinary wood processing is used, it is necessary to devise mechanical equipment in the same manner as the above-described planar, and the same There is a problem.
Further, when a sander is used, the sandpaper is likely to be clogged unless the raw material veneer is dried. Therefore, when using a normal woodworking grinding machine, it is desirable to use a dry veneer having a thickness of 1 mm or more.

Next, a method of compressing with a high-pressure press will be described. Wood is mainly composed of fiber cells, and many of the protoplasm in the fiber cells is lost and hollow.
Therefore, it contracts when a large compressive force is applied. However, since the cell wall is elastic, the cell wall is restored to its original shape to some extent even if it is compressed and deformed unless it is destroyed to the extent that the cell wall loses its elasticity. Depending on the tree species, beech and hippopotamus are permanently deformed when pressed at 100 kg / cm ² or more for a certain period of time and cannot return to their original shape.

However, even under the above-mentioned compression pressure, the restoration is performed to a certain extent in a short time, and under the compression pressure smaller than the above, the original pressure is maintained to a certain extent even if the compression is performed for a long time. Restore to thickness. Further, when pressed at a high temperature, the cell wall of the wood is plasticized, so that it is difficult to restore the original shape even if pressed for a short time.

In the method by pressing, if pressed with too much pressure, the cell wall is destroyed and cannot be used as a raw material veneer, so that the cell wall must be partially destroyed. If the thickness reduction is to be increased, the compression method becomes more difficult. Therefore, when the compression method is adopted, the target is to reduce the thickness by 10 to 30% from the reference thickness. Cutting or grinding methods are preferred.

As shown in FIG. 4, the pressurizing method is such that a large number of rolls whose distance from the surface plate can be adjusted to a predetermined distance are arranged, and the raw material veneer passes between the surface plate and the press roll. Alternatively, a large number of pairs of rolls that can be adjusted at predetermined intervals may be arranged so as to pass through a nip portion of the rolls. However, since only a predetermined portion of the raw material veneer is compressed with a strong pressing force, the pressure of the roll is changed for each time zone in which the raw material veneer passes, as described in the method by grinding. A device is required, and the clamping device becomes complicated. Instead of the pressing method using a roll, the raw material veneer is placed on a template that has been subjected to a convex curved surface processing at a predetermined position on the surface, and pressed with a flat plate press from above and below at high pressure. May be.

In the case of a decorative veneer obtained by slicing a flitch obtained by laminating veneers, the thickness of the grain width must be at least partially reduced to at least 10% of the original thickness. Change is almost recognized and inside. When the thickness of the raw material veneer is partially reduced to a maximum of about 30% of the original thickness, a change in the grain width appears remarkably. In the case of natural precious wood, the grain width, such as in the vicinity of a node, is 30 times larger than the average thickness of other parts.
Although the phenomenon of becoming thinner by more than% can be seen, when trying to express knots etc. in artificial wood decorative veneers, the raw veneer must not be bent with a small radius of curvature near the knots during lamination and bonding. The raw material veneer is broken,
Adhesion is difficult. Therefore, in a normal case, the thickness of a predetermined portion of the raw material veneer may be appropriately reduced within a range of up to about 30%. Even if the thickness is further reduced, the practical value is low.

[0024]

The artificial veneer veneer according to the prior art is
Since the grain width hardly changes from the former mouth to the last mouth,
The change was poor and the commercial value was low as compared with the veneer made of natural precious wood. In the present invention, the artificial veneer veneer veneer material veneer,
Since artificial thickness is applied artificially and then the laminated and glued flitch is sliced to produce a decorative veneer, the grain width changes from the original opening to the end like a natural precious wood decorative veneer. Is observed, and the commercial value can be increased. The invention of claim 2 is an invention in which the rate of thickness reduction of the raw material veneer is limited to a particularly high practical value range.

[Brief description of the drawings]

FIG. 1 is a schematic view of a flitch of an artificial wood decorative veneer according to the present invention.

FIG. 2 is a schematic diagram of an artificial wood veneer veneer according to the prior art.

FIG. 3 is a schematic diagram of an artificial wood veneer veneer according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which a raw material veneer is pressed by a roll.

[Explanation of symbols]

 A Raw material veneer with uneven thickness A 'Raw material veneer without unevenness B Surface plate R Roll

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shun Tojo 5-2-1-1, Oji, Kita-ku, Tokyo Nippon Paper Industries Co., Ltd. F-term (reference) 2B002 AC01 AC07 AC12 BA10 DA02 DA04 DA06 2B242 BA11 BA23 BA24

Claims (4)

[Claims] In a method for producing a decorative wood veneer obtained by thinly slicing a flitch obtained by laminating and bonding wooden veneers in the thickness direction, a predetermined wood veneer is laminated before laminating and bonding the wooden veneers. A method for manufacturing a wooden veneer, wherein the thickness of a portion is reduced by a predetermined thickness from an original thickness. 2. A method for producing a decorative wood veneer obtained by thinly slicing a flitch obtained by laminating and bonding wood veneers in the thickness direction, before laminating and bonding the wood veneers. A method for producing a veneer made of wood, characterized in that the thickness of the portion is reduced within a range of up to 30% of the original thickness. 3. The method for producing a decorative veneer according to claim 1, wherein the means for reducing the thickness of the veneer is a rotary cutting blade, a grinder, or a high-pressure press. 4. A wooden veneer veneer produced by the method according to claim 1, 2.