JP2001232610A - Laminated wood of woody cleaved pieces and manufacturing method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a product of laminated wood of woody cleaved pieces being excellent in surface properties and also in physical properties such as mechanical strength, and a manufacturing method therefor. SOLUTION: The laminated wood of woody cleaved pieces of wood, bamboo or the like is constituted of the woody cleaved pieces having slants in the opposite end parts in the length direction. The manufacturing method of the laminated wood of the woody cleaved pieces has a process wherein a sawn board is obtained by sawing an outside plank or the like, a process wherein the sawn board is sawn off so that it has a parallelogrammic plane or side and that it has a prescribed length and has the slants in the opposite end parts in the length direction, a process wherein the chopstick-shaped woody cleaved pieces are obtained by cleaving the sawn board sawn off in the prescribed length, in the direction of fibers, a process wherein the woody cleaved pieces are dried, a process wherein an adhesive is applied to the dried woody cleaved pieces, a forming process wherein the woody cleaved pieces coated with the adhesive are so juxtaposed as to form a single layer and this layer is laminated in a plurality, and a process wherein a mat of the woody cleaved pieces obtained by the forming is heated and pressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to splitting chopstick-like wood split pieces (hereinafter referred to as "strands") by splitting wood materials such as backboards and house demolition materials derived from sawmills in the fiber direction. A wood-split piece laminate obtained by applying an adhesive to a wood split piece mat (hereinafter referred to as a strand mat) by heating and pressing by a steam injection press, and manufacturing the same. About the method.

[0002]

2. Description of the Related Art Lumber products, which have been used as wooden structural materials such as beams and columns, are processed into a predetermined shape and size by a saw or the like. Further, there is a problem that the lumber product has a variation in strength performance due to the presence of a defect such as a node.

In order to solve such a problem, wood is split in the fiber direction to obtain a chopstick-like wooden material called a strand, and a thermosetting resin adhesive such as a phenol resin is applied to the wooden material to form a large number of strands. A method of manufacturing a plate-like wood material having a large cross-sectional area by laminating in the vertical and longitudinal directions to form a strand mat, and heating and pressing this with a steam injection press, a high-frequency press, or another hot press. Is disclosed in JP-A-7-19.
No. 5313 is disclosed.

According to this prior art, small-diameter wood, backboard, and the like can be used as raw materials, and the yield is improved as compared with lumber products. There is an effect that a wood material having a small and stable strength can be obtained.

[0005]

According to the above-mentioned prior art, both ends in the length direction of the chopstick-like strand have a cut surface perpendicular to the length direction. Normally, the thickness of the strand is as thick as 3 mm to 6 mm, and when the ends in the length direction of the strand are separated from each other in the forming step, a concave portion is formed on the surface of the wood split piece laminated material product obtained by heat compression, and this concave portion is formed. Scattering not only impairs the surface properties of the wood split piece laminated product, but the presence of such discontinuous portions tends to cause stress concentration and lower the bending strength of the product.

An object of the present invention is to solve the above-mentioned problems and to provide a wood split piece laminate material product having excellent surface properties and excellent physical properties such as mechanical strength, and a method for producing the same.

[0007]

According to the first aspect of the present invention, there is provided a wood split piece laminated material, such as wood or bamboo, which has inclined surfaces at both ends in a longitudinal direction. The gist shall consist of split pieces.

According to a second aspect of the present invention, there is provided a process of obtaining a ground plate by sawing a back plate or the like, and forming the ground plate to a predetermined length so as to form a parallelogram plane or side surface. Sawing to have inclined surfaces at both ends in the longitudinal direction, splitting the sawn board cut to the predetermined length in the fiber direction to obtain split chopstick-like wood split pieces, and drying the wood split pieces. A step of applying an adhesive to the split pieces after drying, a forming step of vertically stacking a plurality of the wood split pieces to which the adhesive has been applied, and heating the wood split piece mat obtained by the forming. A method for producing a wood split piece laminated material, comprising a step of pressing.

According to a third aspect of the present invention, the angle between the inclined surface formed at the longitudinal end of the ground plate and the longitudinal direction of the ground plate is 30 ° to 60 °. A wood split piece laminate according to claim 2 or a wood split piece laminate according to claim 2 and a method for producing the same.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described based on preferred embodiments.

[0011]

Since the present invention is constructed as described above, the wood split piece laminated material product has few recesses on the surface and is excellent in surface properties, and also has a high strength by expanding the contact area between the strands at the mouth of the wood. A piece laminate product can be obtained.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings according to a preferred embodiment.

FIG. 1 is a plan view of a ground plate according to an embodiment of the present invention, FIG. 2 is a front view of the ground plate, that is, a diagram showing the side surface of the ground plate, and FIG. FIG. 5 is a partially enlarged view showing a formed inclined surface. FIG. 4 is a longitudinal sectional view showing an example of a row of rotary blades for splitting a ground plate to divide it in the width direction;
FIG. 2 is a schematic view showing an example of a splitting device for splitting a ground plate, showing a cross section perpendicular to a rotation axis of a rotary blade.

1 to 5, reference numeral 1 denotes a rotary blade, which is a shaft 1c which is driven to rotate by a motor (not shown).
The grind plate is split in the fiber direction by a rotating blade tip 1a between the roller and a cylindrical rotating blade receiving roll 2 made of, for example, urethane resin.

As the material of the rotary blade 1 , tool steel, stainless steel, molybdenum steel or the like, which is usually used as a blade, can be used. The outer diameter of the rotary blade 1 is
It is appropriately determined according to the size of the raw material (the material to be split), but is usually in the range of 120 mmφ to 160 mmφ.

Reference numeral 2 denotes a rotary blade receiving roll which has a cylindrical shape and is made of urethane resin in this embodiment. The rotary blade receiving roll 2 is rotatably supported by a machine frame (not shown), is driven by a rotary drive device such as a motor, and is rotated in a direction opposite to the rotary blade 1 as shown in FIG. As a material of the rotary blade receiving roll 2, a material softer than at least the rotary blade 1 such as nylon or urethane, or a light alloy such as aluminum is used.

The rotary blade receiving roll 2 is also called an anvil roll, and constantly presses the rotary blade 1 from below.
The tip of the cutting edge 1a of the rotary blade 1 is made to bite into the cylindrical surface of the rotary blade receiving roll 2 by 2 mm to 3 mm, and the rotary blade 1 is rotated under the application of the pressing force to split the raw material (split material) 5. I do. The outer diameter of the rotary blade receiving roll 2 is, like the rotary blade 1 , usually in a range of 120 mmφ to 160 mmφ.

In the wood material splitting apparatus, when the raw material is fed in the fiber direction and split, wood chips and the like are easily clogged between the rows of rotary blades, and there is a problem that the splitting cannot be stably performed for a long time. . Therefore, in the manufacturing process of the wood split piece laminated material of the present invention, the moving body 4 that moves in synchronization with the feed speed of the raw material is provided between the rotary blade rows.

Reference numeral 3a denotes a driving roll, which wraps around the moving body 4 and is driven to rotate by a motor (not shown). 3b
Reference numeral denotes a driven roll (idle roll), which is rotatably supported by the machine frame and loops around the moving body 4. In this embodiment, two rolls are provided as shown in FIG.

The drive roll 3a, two driven rolls (idle rolls) 3b, and the adjacent boss 1 shown in FIG.
The moving body 4 moves along the infinite activation formed by the sheave (truck) formed by d. In this embodiment, the moving body 4 is moved by the driving roll 3a at a speed synchronized with the peripheral speed of the sheave (truck wheel) formed by the adjacent boss 1d.

In this embodiment, the moving body 4 is 4.0.
mmφ steel wire. As shown in FIG. 5, the drive roll 3a is formed in synchronization with the peripheral speed of the sheave (truck) formed by the adjacent bosses 1d along the endless track and along the moving direction of the raw material (split material) 5. Moved by.

In this embodiment, the angle between the sheave (truck wheel) formed by the adjacent boss 1d and the horizontal plane of the moving body 4 between the driven roll (idle roll) 3b is
As shown in FIG. 5, it is 10 °. This angle can be appropriately selected according to the moving (split) speed of the raw material (split material) 5 and the like.

In this embodiment, the moving body 4 is set at 4.0.
Although it was a steel wire of mmφ, a belt,
A moving body using an endless track such as a chain, a wire rope, or a slat conveyor (such as a conveyor for moving a sushi dish) can also be used.

In the embodiment shown in FIG. 5, although the endless track of the moving body 4 is formed in a plane perpendicular to the rotation axis of the rotary blade, the moving body 4 is parallel to the traveling direction of the raw material (split material) 5. An infinite orbit can be formed at an arbitrary angle in the plane. For example, in the case of a slat conveyor, an endless track may be formed in a horizontal plane, and the raw material (split material) 5 may be restrained and guided between the adjacent boss 1d and the rotary blade receiving roll 2.

Although the cross section of the moving body 4 is circular in this embodiment, various cross sections such as a square cross section and a polygon cross section can be adopted.

Further, as the material of the moving body 4, various materials such as a rubber such as a steel cord, a reinforced soft synthetic resin, and the like in addition to a metal such as steel can be adopted.

The moving body 4 is fitted into grooves formed in the drive roll 3a and the driven roll (idle roll) 3b, and the drive roll 3a, the driven roll (idle roll) 3b, and the adjacent boss 1d are formed. It is wrapped around the sheave (groove).

In this embodiment, the interval between the adjacent rotary blades 1a shown in FIG.
The moving body 4 which is fitted in the sheave (groove) and the grooves of the drive roll 3a and the driven roll (idle roll) 3b, and moves along the endless track, is 4.0 mmφ.

Reference numeral 5 denotes a raw material, that is, a ground plate, which is obtained by, for example, sawing a back plate and cutting it to a predetermined length (L). In this embodiment, the thickness (t) is 5 mm and the length (L) is 600 mm. Width (W)
Has various values depending on, for example, the size and shape of the cross section of the back plate.

Next, the process for producing the wood split piece laminate of the present invention will be described. In the present invention, for example, in a cutting process of obtaining a ground plate having a length of 600 mm, the rotary blade of the cutting machine is inclined to perform cutting. Thus, as shown in FIGS. 2 and 3, an inclined surface (51) is formed at both ends of the side surface of the grind plate 5 so that the side surface shape forms a parallelogram.

According to the knowledge of the present inventors, the angle θ between the inclined surfaces (51) at both ends of the side surface of the ground plate 5 and the front and back surfaces of the ground plate is 30
° to 60 °. When the inclination angle θ is less than 30 °, the length of the inclined surface (length in the direction parallel to the front and back surfaces of the ground plate) exceeds 1.7 times the ground plate thickness, and the unsteady portion becomes too long,
Loose recesses may be formed on the surface of the split wood product. On the other hand, if the inclination angle θ exceeds 60 °, the length of the inclined surface is less than 0.6 times the thickness of the ground plate, and the effect of forming the inclined surface cannot be exhibited.

The wood split pieces thus obtained are dried by a dryer. Drying of the wood split pieces is performed by arranging the wood split pieces in a mat in a dryer.
This is performed in hot air at 0 ° C. for 10 minutes.

Next, an adhesive is applied to the wood split pieces using a spreader or the like. As the adhesive used in the present invention, a thermosetting synthetic resin adhesive commonly used for bonding wood can be used. In particular, a thermosetting resin adhesive such as a phenol resin adhesive or diphenylmethane isocyanate (MDI) which is an isocyanate compound can be suitably used.

The wood split pieces to which the adhesive has been applied are continuously juxtaposed on a conveyor to form a single layer. The single layers are sequentially laminated to form a wood split mat having a thickness of 600 mm to 1000 mm. At the time of forming the mat, the split wood pieces are staggered in the layer thickness direction and / or the width direction so that the longitudinal ends of the split wood pieces are not aligned in the stack.

Next, the strand mat is heated and pressed by a steam injection press. When the strand mat is heated and pressed, the press platen pressure is set to 0.
When the pressure becomes 5 kgf / cm ² or more, for example, 1.0 kgf / cm ² , the descent of the press platen is stopped, and steam is circulated through the strand mat at a stage where the density of the strand mat is low, so that the temperature of the core layer portion of the strand mat is at least reduced. 90
After the temperature is raised to ° C., the lowering / pressing of the press board is restarted, and the jetting of steam to the strand mat is continued for, for example, 8 minutes.

In the above process, the temperature of the core layer of the strand mat reaches 160 ° C., the surface temperature of the core layer reaches 170 ° C., and the pressing pressure becomes 45 kgf / cm ² . After keeping the temperature of the strand mat in a temperature range of 130 ° C. or more for 7 to 9 minutes, the heating and pressing are completed.

Thereafter, the internal pressure is released, and after 2 minutes,
The pressure is reduced and the heating / clamping operation is completed.

Example 1 A ground plate having a thickness of 5 mm was prepared from a back plate derived from a sawmill. The ground plate was cut to a length of 600 mm. At this time, the saw was tilted by 45 °, and a ground plate having a rhombic side surface having a 45 ° inclined surface at both end portions of the side surface was obtained.

The ground plate was slit with a splitting device shown in FIGS. 4 and 5 so as to be split into chopsticks having a width of 8 mm.

The split chopstick-like wood split pieces were placed in a dryer for 1 hour.
Dry at 80 ° C. for 10 minutes. A phenolic resin adhesive was applied to the dried wood split pieces with a spreader. The application amount was 12 parts by weight based on 100 parts by weight of wood split pieces.

The split wood pieces were continuously arranged in parallel to form a single layer, which was then laminated to form a strand mat. Strand mat thickness is 800mm, length is 45
00 mm.

The strand mat was heated and pressed by a steam injection press. In the heating / pressing step, when the pressure of the press platen becomes 1.2 kgf / cm ² , the descent of the press platen is stopped, and water vapor passes through many pores formed in the press platen surface at the stage where the density of the strand mat is low. To lower the temperature of the core layer of the strand mat, and when the temperature of the core layer portion reached 95 ° C., the depression (reduction) of the press board was restarted and the injection of water vapor was continued.

The temperature of the core layer of the strand mat reached 160 ° C. and the temperature of the surface layer reached 170 ° C. at the time when the descent of the press platen and the injection of steam from the press platen surface pores were continued for 7 minutes.
The press platen pressure was 40 kgf / cm ² . After securing the temperature of the strand mat ≧ 130 ° C. for 7.5 minutes or more, the heating / pressing was completed.

Thereafter, the internal pressure was released, the pressure was reduced after a lapse of 2 minutes, and the heating and pressing operation was completed after 3 minutes.

A 130 mm thick wood split ply laminate product was obtained. The adhesive was sufficiently cured, and no puncture occurred. Wood split ply laminate products have specific gravity:
0.58, bending strength: 350 kgf / cm ^2, bending Young's modulus: had the physical properties of 90000kgf / cm ^2. Also, the number of concave portions on the surface was significantly smaller than that of the conventional product.

[0046]

According to the present invention, a wood split piece laminated material product which has few concave portions due to the separation between both ends in the length direction of the wood split piece, has excellent surface properties, and has good physical properties with high bending strength. Obtainable.

[Brief description of the drawings]

FIG. 1 is a plan view of a sawn board of a predetermined length and having a rhombic side shape according to an embodiment of the present invention.

FIG. 2 is a front view of a ground plate having a rhombus-shaped side surface.

FIG. 3 is an enlarged front view showing both ends of a ground plate having a rhombus-shaped side surface.

FIG. 4 is a longitudinal cross-sectional view showing a rotary blade tip row of the wood material splitting apparatus.

FIG. 5 is a schematic view showing an example of a wood material splitting apparatus.

[Description of Signs] 1 rotary blade 1a rotary blade tip 1c shaft 1d boss 2 rotary blade tip receiver 3a drive roll 3b driven roll 4 moving body 5 raw material (grinding plate) 51 inclined surface L length of grinding plate (raw material) W grinding plate ( Raw material) width t Thickness of ground plate (raw material)

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference) 2B260 BA01 BA20 CB04 CB10 EB05 EB19

Claims (3)

[Claims] Claims: 1. A wood split piece laminated material such as wood or bamboo,
A wood split piece laminate comprising a wood split piece having inclined surfaces at both ends in the length direction. 2. A step of sawing a back plate or the like to obtain a ground plate, wherein the ground plate has a predetermined length and inclined surfaces at both ends in a longitudinal direction so as to form a parallelogram plane or side surface. Cutting the sawed board to a predetermined length in the fiber direction to obtain split chopstick-shaped wood split pieces, drying the wood split pieces, and drying the split pieces. A step of applying a glue to the wood, a forming step of vertically stacking a plurality of the wood split pieces coated with the adhesive in the vertical direction, and a step of heating and pressing the wood split piece mat obtained by the forming. A method for producing a split wood laminate material. 3. The wood split piece laminate according to claim 1, wherein the angle formed by the inclined surface formed at the longitudinal end of the ground plate with the length direction of the ground plate is 30 ° to 60 °. Or the wood split piece laminated material of Claim 2 and its manufacturing method.