JPH07195313A - Method and device for manufacture of split piece laminated wood - Google Patents

Abstract

PURPOSE:To utilize all of chips and construction scraps without wasting them by a method wherein raw materials such as wood and bamboo are split in the longitudinal direction, thin split materials obtained by splitting the raw materials thinly furthermore are dried, the thin split materials coated with an adhesive are aligned in the longitudinal direction so as to form single-layers, the single-layers are laminated in a plurality of layers, and they are heated and clamped with pressure. CONSTITUTION:A cut log A is split by a splitting device 5 so as to form split pieces 6. The split pieces 6 sent to a thinly splitting device 7 are split furthermore thinly so as to produce thin split pieces 8. The thin split pieces 8 are dried with hot air in a drying device 9. Thereafter, the thin split pieces 8 are sent to an adhesive coating device 17 so as to be coated with the adhesive. The thin split pieces 8 are sent to a laminating means 18. While they are being aligned on a belt conveyor of a conveying means 20, single-layers of the thin split pieces 8 are laminated in sequence split piece mat 12 is adjusted to a predetermined length by a cutting device 21, it is sent to a press-clamp means 22 so as to be heated and clamped with pressure.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a plank plate material used for furniture, housing, other constructions, and constructions, which is made of wood resources such as small-diameter trees and bamboos, which have not been effectively used until now. The present invention relates to a split piece laminated material that can be used as a pillar material, a beam material, and the like, a manufacturing method thereof, and a manufacturing apparatus.

[0002]

2. Description of the Related Art Up to now, a lumber product obtained by cutting raw wood into a predetermined size and shape has been most popular as a wooden structural material such as a pillar or a beam. A lumber product is usually formed from lumber having a diameter of 100 mm or more, and the yield from the standing timber body is 50.
.About.60%, and the yield of lumber products obtained from one stand including the branches falls to about 30 to 50%.
Further, lumber products often have drawbacks such as knots, but in that case, the strength of the lumber products must be remarkably reduced as compared with the strength inherent to wood. In other words, the strength of lumber products with knots is 4 compared to those without knots.
0 to 50% lower.

[0003] In addition, a laminated material (a plate material laminated by sawing and laminating and adhering) devised in order to solve the problem of strength due to defects such as knots of lumber products, the defects due to knots are dispersed. As a result, the strength ratio is improved to 0.6 to 0.75, but most of the wood is consumed by the cutting process for forming the plate material, and the yield from standing trees is reduced to about 30 to 40%.

In the case of a laminated veneer material (LVL) in which laminated veneers are laminated and bonded, a sawing process is not required to form the veneer unlike the ordinary lumber processing, and therefore the above-mentioned lumber product As in the case of laminated wood, sawdust is not generated and the yield from standing trees is improved to 60-70%, and the strength is similar to that of laminated wood.
Since it is manufactured by peeling it thinly, it can only be used for large diameter logs.

[0005]

As is well known, since wood and bamboo have many advantages such as gentle texture, easy acquisition and processing, and reproducibility, they are old. Widely used by. However, with the increase in the world population and the improvement of living standards, the usage of wood and the like has remarkably increased, and the demand for wood materials has become more sophisticated and diversified. For this reason, in addition to traditional lumber products, laminated lumber and laminated veneer lumber (plywood, LVL) as described above.
And other new wood-based materials are being developed.

However, conventional lumber products, laminated lumber, and laminated veneer lumber (plywood, LVL) have a problem that limited forest resources cannot be effectively used. In other words, lumber products and laminated lumber can only be used for less than half the standing tree volume,
Further, even if the veneer laminated material can utilize 60 to 70% of the volume of the raw wood, the raw wood is limited to an extremely large diameter. Today, when the trend of decreasing forest resources and the resulting deterioration of the environment are proclaimed, when using wood as a material for furniture, buildings, structures, etc. It is no exaggeration to say that the realization of technology that minimizes the occurrence of wasted parts is an urgent task. The present invention is intended to solve such a problem.

[0007]

SUMMARY OF THE INVENTION The split piece laminate material according to the present invention is a single layer formed by arranging a slit material formed by splitting wood, bamboo or other raw material in the longitudinal direction in the horizontal direction. A plurality of vertical joints are provided, and the horizontal joint of each single layer is provided at a position apart from the joints of other layers overlapping the layer having the joint in the laminating direction of the single layer, and each subdivided material. Are solidified and bonded by an adhesive under pressure.

Further, the method for producing a split piece laminate material according to the present invention includes (a) a step of splitting a raw material such as wood, bamboo or the like in a longitudinal direction, and (b) a split material obtained in the above step in a longitudinal direction thereof. Step of further finely splitting, (C) step of drying finely split finely divided material, (D) step of applying adhesive to dried finely divided material, (e) finely divided section with adhesive applied The materials are arranged side by side in the longitudinal direction to form a single layer, and the steps of laminating the single layers into a plurality of layers, and (f) heating and pressing the laminated subdivided materials are provided. In the above step (e), each single layer is formed by arranging a predetermined length of slit material in parallel in the longitudinal direction, and joining the end portions of the single layers to each other in the longitudinal direction of the slit material. While extending, the joint portions of these single layer end portions should not overlap in the laminating direction of the single layers. There is to be formed.

In the above process, the single layer may have a parallelogram shape in plan view and are sequentially laminated.

Furthermore, in the above process, the glass fiber cloth may be inserted between the laminated single layers.

An apparatus for manufacturing a split piece laminate material according to the present invention comprises means for splitting wood, bamboo or other raw materials in the longitudinal direction,
A means for further splitting the split material obtained in the splitting process in its longitudinal direction, a means for drying the finely split split material, a means for applying an adhesive to the dried split material, and an adhesive It comprises a means for forming a single layer by arranging the applied finely divided materials side by side in the longitudinal direction, laminating the single layers into a plurality of layers, and means for heating and pressing the laminated finely divided materials. Has been done.

The above-mentioned splitting means comprises a pair of rotary blades facing each other and a drive source for the rotary blades. The rotary blades include a rotary cylinder and circular blades provided in multiple stages around the entire circumference of the rotary cylinder. With the configuration, each cutting edge of the circular blade in one of the rotary blades is provided with a configuration protruding slightly between each cutting edge of the circular blade in the other rotary blade, each circular blade in the rotary blade has an angle of the cutting edge. It is composed of double-edged blades of 20 degrees, and the distance between each cutting edge is 10 m
m, and the height from the rotary cylinder to the cutting edge may be 30 mm. In addition, each circular blade of the rotary blade may be a single blade with a blade edge angle of 20 degrees, and the blade edge spacing may be 4 mm and the height from the rotary cylinder to the blade edge may be 7.5 mm.

Since the present invention has the above-mentioned structure, it has not been used until now, a small-diameter tree that has not been used up to now, a branch of a standing tree that has been conventionally discarded in forest land, and a scrap material that has been incinerated until now in the lumber process. In addition, we have realized the provision of new and useful wood-based materials that can be used for various types of waste materials. This new wood-based material is similar to conventional wood-based materials in furniture, buildings,
It is useful as a material used for various structures.

[0014]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 and FIG. 2 show a manufacturing process of a split piece laminate material.
It is a figure which shows an Example. In this example, willow, bamboo, cedar, and waste materials of a house were used as raw materials, and split raw materials were manufactured by using each raw material alone, but it goes without saying that these raw materials may be mixed. . In the figure, 1 is a small diameter tree of willow (diameter 20 to 50 mm), 2 is bamboo with a diameter of 20 to 100 mm, 3 is cedar, 4 is waste material generated by dismantling a house, etc. Cut into lengths of 600 mm to obtain standard length materials 1a and 2a, respectively. Also, after cutting the cedar 3 and the waste material 4 into a length of 600 mm, further 25 m
Cut into m-thick plate materials to obtain predetermined standard length materials 3a, 4a.
Next, each of the standard length materials made of the raw material is split into a splitting device 5 described later.
By splitting to make a split piece 6 having a thickness of 10 mm. The thus obtained split piece 6 is further finely split by the fine splitting device 7 to form a fine split piece 8 having a cross section of 4 mm × 10 mm. In addition, the raw material of less than 600 mm is also split and used here.

Next, the finely divided pieces 8 are placed in a dryer 9 for 10 to 10 minutes.
Layered to a thickness of 20 mm, 180-200 ° C, wind speed 10
m / sec. To dry for 5-10 minutes. The drying may be natural drying, and in this case, it is dried with air at room temperature for 2 to 3 days.
The dried finely divided pieces 8 are sprayed with a phenol resin adhesive (10% by weight of the finely divided pieces) in the rotary drum 10. After the adhesive application process, the finely divided pieces 8 are put into a wooden frame (6
50 × 650) in parallel in the longitudinal direction to form a single layer of subdivided row pieces, and the single layers are sequentially laminated to have a thickness of 80 mm to 12
A 0 mm fine split mat 12 is obtained. When laminating the single layers, the end portions of the single layers in the longitudinal direction are displaced from each other so that the end portions do not coincide with each other in the laminating direction. In addition, 0.
If a glass fiber cloth having a thickness of 1 to 0.2 mm is inserted, the quality of the final product is improved, and even if a nail is driven into the end, it does not crack. Therefore, in order to prevent cracking due to nailing, a glass fiber cloth may be provided only at the end portions.

The fine split piece mat obtained in the above process was pressed by a cold press 13 at a pressing pressure of 6 kgf / c to obtain 10 pieces.
Press for 1 minute, then press pressure 4 to 1 by hot press
After clamping at 2 kgf / c at a temperature of 150 ° C for 25 minutes,
Decompressed and cured, 25-30 mm thick split piece laminate 1
5 is completed.

FIG. 3 is a view showing an embodiment of the split piece laminated material manufacturing apparatus according to the present invention. In the figure, 5 is a cleaving device for cleaving various raw materials cut into a predetermined length into a predetermined size and shape, and 7 is a cleaving piece 6 sent from the cleaving means 5 by a conveying means (not shown). Further, a slitting device for finely splitting to form the slitting piece 8, 9 is a drying device for the slitting piece 8, 16 is a stocker, and 17 is an adhesive coating device on the mesh belt conveyor 17a and its upper surface. A spray 17b for ejecting the adhesive from both upper and lower directions of the placed split moving piece 8 is provided. Reference numeral 18 denotes a laminating means interposed between the mesh belt conveyor 17a and the conveying means 20. The laminating means 18 moves back and forth in the direction of the arrow to cooperate with the movement of the belt conveyor of the conveying means 20 to form a desired shape. Layers are formed and sequentially laminated to form the split fragment mat 12. Reference numeral 21 denotes a cutting device for cutting the finely divided fragment mat 12 moved by the conveying means 20 into a predetermined length, which is a cross-cut saw (not shown) that appears in and out of the finely divided fragment mat 12.
It is equipped with Reference numeral 22 denotes a pressing means, which is constituted by a hot press or a high frequency heating press, and heat-presses the fine split piece mat 12 to cure the adhesive to split the split piece laminate 1.
5 is formed. Reference numeral 23 denotes a shaping means, which cuts the split piece laminated material 15 sent from the pressing means 22 into a desired size and shape by a Crocut saw 23a, a sizer 23b or the like.

FIG. 4 is a front view showing the splitting device 5 and the fine splitting device 7, and FIG. 5 is a side view of the splitting device 5. In FIG.
Reference numeral 51 is a pair of rotary blades installed opposite to each other, 52 is a motor as a drive source, and 53 is a guide for feeding the raw material in the rotary blade direction. FIG. 6 is a partial sectional view of the rotary blade 51,
As shown in the figure, the rotary blade 51 is composed of a rotary cylinder 51a and circular blades 51b which are arranged in parallel in multiple stages around the entire circumference of the rotary cylinder 51a. The rotary blade 51 shown in this figure is used for the splitting device 5, and the blade edge of the circular blade 51b is a double blade as shown in the figure. In addition, in this embodiment, the angle of the blade edges that are double blades is 20 degrees, and the height of the circular blade 51b, that is, the height from the rotary cylinder 51a to the blade edge is 30 m.
It is formed in m and the interval between the circular blades arranged in parallel is 10
It is set to mm. The pair of rotary blades 51, 51 are arranged to face each other and rotate in opposite directions as described above, but the blade edges of the facing circular blades 51b are formed by the opposing blade edges as shown in FIG. It is installed so as to protrude slightly into the gap.

The rotary blade 51 shown in FIG.
The blade edge of the circular blade 51b is a single blade as shown in the figure. In this embodiment, the angle of the blade is 20 degrees, and the height of the circular blade 51b, that is, the height from the rotary cylinder 51a to the blade is 7.5 mm, and the interval between the circular blades arranged in parallel. Is set to 4 mm. The pair of rotary blades 51, 51 are arranged to face each other and rotate in opposite directions as described above, but the blade edges of the facing circular blades 51b are scissors as shown in FIG. Similarly, they are designed to come into contact with each other and scissor the object.

The operation of the manufacturing apparatus according to the above embodiment will be described. In this example, logs having a diameter of less than 50 mm were used as a raw material. First, the log A is cut into a length of 600 mm using a cross cut saw or a chain saw. Splitting device 5 having the above-mentioned rotary blade 51 for the cut log A
(See FIGS. 4, 5, 6, and 7) Split thickness of about 1
A split piece 6 of 0 mm is formed. Next, the cleaving piece 6 sent to the cleaving device 7 having the above-described rotary blade (see FIGS. 8 and 9) is further cleaved here to form a cleaving piece 8 having a thickness of 4 mm and a width of 10 mm. . The finely divided pieces 8 are dried with hot air in a drying device 9. The drying time is about 10 minutes when the temperature is 200 ° C.

The finely divided pieces 8 that have undergone the drying process are sent to the adhesive application device 17 via the stocker 16 and applied with the adhesive. That is, the finely divided pieces 8 are mesh belt conveyors.
While being conveyed by 17a, spray-1 is applied from both upper and lower directions.
The adhesive is applied by 7b. Then, the shredded pieces 8 are sent to the laminating means 18. Laminating means 18 is provided as the pieces 8 are sent out from the mesh belt conveyor 17a.
Is advanced in the direction of the conveying means 20 with an arrow, and while sequentially laying the finely divided pieces 8 on a belt conveyor capable of reciprocating the conveying means 20, as shown in FIG. Layers B1 and B2 are sequentially formed. Next, the transport means 2
No. 0 belt conveyor moves back and C1, C on top of B single layer
The C single layer shown by 2 is sequentially laminated on the D single layer such as D1 and D2 to form the fine split piece mat 12, and at that time, as shown in FIG. The end portions (joint portions) E, E, E of the layers are formed so as to be offset from each other in the stacking direction. Although FIG. 10 shows a case where each single layer is formed in a rectangular shape, each single layer may be formed in a parallelogram as shown in FIG. 11. In order to form the parallelogram in this way, the parallelogram can be easily formed by moving the belt conveyor while feeding the finely divided pieces 8 from the laminating means 18 to the conveying means 20. In any case, the single layer formation and the single layer transport are performed by the adhesive applying means 1
7, the transport means 18, and the transport means 20 cooperate with each other, but the operation required for each means is performed by the control means (not shown).

The finely divided piece mat 12 is formed by the cutting device 2 described above.
After being adjusted to a predetermined length by 1, it is sent to the pressing means 22 and heated and pressed to cure the adhesive. The split adhesive laminate is obtained by curing the adhesive. The split piece laminate obtained in this way is a single layer in which the fine split pieces formed by splitting wood, bamboo or other raw material in the longitudinal direction are arranged in the longitudinal direction in the horizontal and vertical directions. A plurality of joints are provided, and the horizontal joint portion of each single layer is provided at a position apart from the joint portion of the other layer that overlaps the layer having the joint portion in the laminating direction of the single layer, and each slit piece is pressed. It has a configuration in which it is solidified and bonded by an adhesive in a state. In FIG. 3, the split piece laminated material 15 is sent from the pressing means 22 to the shaping means 23 and shaped into a desired shape.

Next, Test 1 relating to the performance of the split piece laminate obtained according to the present invention will be described. 12 to 15 are diagrams showing the results of specific gravity measurement, bending strength, and horizontal shear strength of the split piece laminated material obtained under the following manufacturing conditions. Pressing conditions Cold press Pressing pressure: 6 kgf / c, Pressing time: 10 minutes Hot pressing Pressing pressure: 4-12 kgf / c, Temperature: 150
C, time: 25 minutes In addition, the split piece laminated material used for the test has a thickness of 25 mm to
30 mm wide, 30 mm wide, 600 mm long,
There are four types of raw materials for split pieces: cedar logs, waste cedar wood, willow and bamboo.

FIG. 12 is a graph showing the results of measurement of specific gravity. From this result, it was found that there is a considerable difference in specific gravity depending on the raw materials. For cedar and willow, the specific gravity is about 1.5 times that of lumber, and for bamboo, it is equivalent to the original gravity of bamboo.

FIG. 13 is a graph showing the measurement results of Young's modulus of bending. The bending Young's modulus of split piece laminates made from cedar or willow is almost equal, and the difference between vertical use (when loaded perpendicular to the pressing direction) and flat use (when applied parallel to the pressing direction) Is few. This value is about 1.5 times the bending Young's modulus of lumber products. In the case of Mantake, there is some difference between vertical use and flat use, but it is close to the original bending Young's modulus of Mantake.

FIG. 14 is a graph showing the measurement results of bending strength. There is no difference in bending strength between any of the raw materials when used vertically and when used flat. The bending strength of the split piece laminated material using cedar and willow as raw materials has reached about three times that of lumber products made of cedar and willow.

FIG. 15 is a graph showing the results of the horizontal shear strength test. The strength of the split piece laminate made from cedar and willow is similar to the strength of the lumber products made from cedar and willow.

From the above test results, the split piece laminated material using cedar and willow as a raw material has an increased specific gravity as compared with the raw material.
Since the defective parts such as knots of the raw material are dispersed, it becomes clear that the values of Young's modulus of bending and bending strength are significantly higher than those of the raw material. This fact can be said to be that the split piece laminate according to the present invention is an optimal new material for structural members such as buildings that require high quality performance. In the case of bamboo, since bamboo has high specific gravity and performance, it is speculated that if the press pressure is increased to about 10 to 20 kgf / c, higher performance than bamboo itself can be realized by the split piece laminate material. It

Further, Test 2 on the performance of the split piece laminate obtained by the present invention will be described. FIG.
19 to 19 are diagrams showing the results of specific gravity measurement, bending strength, and horizontal shear strength of the split piece laminated material obtained under the following manufacturing conditions. Pressing conditions Cold press Pressing pressure: 6 kgf / c, Pressing time: 10 minutes Hot pressing Pressing pressure: 4-12 kgf / c, Temperature: 150
C, time: 25 minutes In addition, the split piece laminated material used for the test has a thickness of 25 mm to
50 mm, width 30 mm, length 600 mm,
The raw material of the split pieces is a small diameter tree of willow having a diameter of 20 mm to 60 mm. And hot press pressure is 4kg, 6kg, 8k
The split piece laminates manufactured as g and 12 kg were prepared and compared.

FIG. 16 is a graph showing the results of measurement of specific gravity. From these results, the pressing pressure was changed from 4 kgf / to 12 kg.
It is found that the specific gravity also increases with increasing kgf /.

FIG. 17 is a graph showing the measurement results of Young's modulus of bending. The bending Young's modulus of each split piece laminated material shows a higher value in vertical use (when loaded perpendicularly to the clamping direction) than in flat use (when loaded parallel to the clamping direction).
The bending Young's modulus increases with increasing pressure.

FIG. 18 is a graph showing the measurement results of bending strength. Although the strength increases as the pressure increases, there is no difference in bending strength between vertical use and flat use.

FIG. 19 is a graph showing the results of the horizontal shear strength test. As the pressure increases, the strength increases, and there is a difference in strength between vertical use and horizontal use.

From the above test results, it is revealed that the strength of the product can be freely controlled by changing the pressure at the time of pressing in manufacturing the split piece laminate material. By the way, when comparing the strength of the test material in Test 2 and the lumber product of the same size and shape as the test material, the split piece laminated material with 4 kgf / c was 1.
It has 5 times the strength, and 2 kg at 6 kgf / c.
Double, 8kgf / c 2.25 times, 12kgf / c
Will be about 2.5 times.

By the way, in the split piece laminated material according to the present application,
A joint portion is formed by the longitudinal end portions of the split pieces, but the strength of the product is naturally improved when the joint portions are dispersed. 20 and 21 show the results of Test 3 comparing the strengths in the cases where the ratio of the joined portion to the non-joined portion is 0, 1/3, 1/2, and 2/3, respectively, in the cross section having the split piece laminate material. It is a graph which shows. As shown in FIG. 20, at ⅓, the Young's modulus of bending was not reduced as compared with 0, but at ½, it was reduced by about 10%, and by ⅔, it was reduced by about 20%. Further, as is apparent from FIG. 21, the influence of the joint portion is more remarkable in terms of bending strength. That is, the bending strength is 10 to 20% at 1/3 and 1 as compared with the case where the joint portion is 0.
It is reduced by 30% at / 2 and by 40 to 50% at 2/3.

From Test 3 described above, it is found that the dispersion of the joint portion in the split piece laminate material has a very important meaning. Therefore, in the present invention, when the single layers in which the split pieces are arranged side by side are stacked as described above, the joint portions of the single layers adjacent to each other in the longitudinal direction are configured not to overlap in the stacking direction. In the case of stacking as shown in FIG. 11, since the ratio of the above-mentioned joint portion can be suppressed to about 1/6, there is no fear of strength reduction.

By the way, an example in which a glass fiber cloth is stretched on the split piece laminated material according to the present invention to prevent the end portion from being cracked by nailing has been described above, and Test 4 relating to this will be described.
75mm in length and 3mm in diameter for products with glass fiber cloth
When the nail was hammered in, no crack was generated even if the nail was hammered in at a position 6 mm from the end face of the product. Therefore,
In such a product, a simple joining means such as nailing can be adopted in a wide range.

In the above embodiment, the case where the hot press is used as the heating means at the time of pressing has been described. According to the results of the experiment, the split piece laminated material can be used even if the hot press is used instead of the hot press. However, the high-frequency heating method is effective for manufacturing thick products.

Next, the yield (yield) of the split piece laminated material according to the present invention for standing trees will be described. According to the experiment, when the weight of the standing tree is 1000, the weight of the split piece laminate obtained from this is 460. However, 1 of Tachiki
In general, about 490 of the weight of 000 is water, bark, etc., so that the substantial yield of split cleaved laminate material from standing trees is about 90%. If the product size is large, this value is 2 to 3 %improves. As described above, the yield of the split piece laminated material according to the present invention is extremely high, and effective utilization of wood resources can be expected. By the way, lumber products, laminated wood, and plywood part pools are 50-60%, 30-40%, and 60-7, respectively.
It is 0%.

[0039]

As described above, according to the present invention, small-diameter / low-quality trees that have not been used so far, discarded cuttings, scraps generated during the lumbering process, construction scraps, etc. can all be used without waste. Moreover, since the yield of raw materials is extremely high, the effective utilization rate of forest resources can be significantly improved. In addition, by changing the clamping pressure, etc. in the manufacturing process and selecting various raw materials for the split pieces, it is possible to obtain products with performances that cannot be obtained with conventional wood materials, such as heavy and light, hard and soft, and strength. Can be realized easily. Furthermore, since fast-growing low-quality trees can be used in a state of small diameter, it contributes greatly to the establishment of cultivation forestry.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first half of a manufacturing process of a split piece laminated material.

FIG. 2 is a perspective view showing the latter half of the manufacturing process of the split piece laminate.

FIG. 3 is a perspective view showing an embodiment of an apparatus for manufacturing a split piece laminate material.

FIG. 4 is a front view of the cleaving device in FIG.

FIG. 5 is a side view of the same.

FIG. 6 is a cross-sectional view showing one embodiment of a rotary blade for manufacturing a split piece.

FIG. 7 is a sectional view showing a meshing state of the rotary blades of the same.

FIG. 8 is a cross-sectional view showing one embodiment of a rotary blade for producing a slit piece.

9 is a cross-sectional view showing an engaged state of the rotary blade shown in FIG.

FIG. 10 is a perspective view showing a laminated state of a single layer by juxtaposing the split pieces.

FIG. 11 is a plan view showing a state in which a single layer formed by juxtaposing the fine split pieces is formed into a parallelogram and laminated.

FIG. 12 is a graph comparing the specific gravities of products manufactured from different materials.

FIG. 13 is a graph comparing bending Young's moduli of the above products.

FIG. 14 is a graph comparing the bending strengths of the above products.

FIG. 14 is a graph comparing the bending strengths of the above products.

FIG. 15 is a graph comparing the horizontal shear strength of the above products.

FIG. 16 is a graph comparing the specific gravities of products when the pressure at the time of clamping is changed using the same raw material.

FIG. 17 is a graph comparing bending Young's moduli in FIG.

FIG. 18 is a graph comparing bending strengths in FIG. 16.

19 is a graph comparing horizontal shear strengths in FIG.

FIG. 20 is a graph showing that the bending Young's modulus is different depending on the dispersion state of the joint portion at the end of the finely split material.

FIG. 21 is a graph showing that the bending strength varies depending on the dispersion state of the joint portion at the ends of the slitting material.

[Explanation of symbols]

 5 Cleaving device 6 Cleaving piece 7 Fine cleaving device 8 Fine cleaving piece 9 Drying device 17 Adhesive applying means 18 Laminating device 22 Heating and pressing means

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 3, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a perspective view showing a first half of a manufacturing process of a split piece laminated material.

FIG. 2 is a perspective view showing the latter half of the manufacturing process of the split piece laminate material.

FIG. 3 is a perspective view showing an embodiment of an apparatus for manufacturing a split piece laminate material.

FIG. 4 is a front view of the cleaving device in FIG.

FIG. 5 is a side view of the same.

FIG. 6 is a cross-sectional view showing one embodiment of a rotary blade for manufacturing a split piece.

FIG. 7 is a sectional view showing a meshing state of the rotary blades of the same.

FIG. 8 is a cross-sectional view showing one embodiment of a rotary blade for producing a slit piece.

9 is a cross-sectional view showing an engaged state of the rotary blade shown in FIG.

FIG. 10 is a perspective view showing a laminated state of a single layer by juxtaposing the split pieces.

FIG. 11 is a plan view showing a state in which a single layer formed by juxtaposing the fine split pieces is formed into a parallelogram and laminated.

FIG. 12 is a graph comparing the specific gravities of products manufactured from different materials.

FIG. 13 is a graph comparing bending Young's moduli of the above products.

FIG. 14 is a graph comparing the bending strengths of the above products.

FIG. 15 is a graph comparing the parallel shear strengths of the above products.

FIG. 16 is a graph comparing the specific gravities of products when the pressure at the time of clamping is changed using the same raw material.

FIG. 17 is a graph comparing bending Young's moduli in FIG.

FIG. 18 is a graph comparing bending strengths in FIG. 16.

19 is a graph comparing horizontal shear strengths in FIG.

FIG. 20 is a graph showing that the bending Young's modulus is different depending on the dispersion state of the joint portion at the end of the finely split material.

FIG. 21 is a graph showing that the bending strength varies depending on the dispersion state of the joint portion at the ends of the slitting material.

[Explanation of Codes] 5 Cleaving Device 6 Cleaving Piece 7 Fine Cleaving Device 8 Fine Cleaving Piece 9 Drying Device 17 Adhesive Application Means 18 Laminating Device 22 Heating and Pressing Means

Claims (12)

[Claims] 1. A method for producing a split piece laminate comprising the following steps. (A) A process of splitting raw materials such as wood and bamboo in the longitudinal direction,
(B) A step of further splitting the split material obtained in the above step in its longitudinal direction, (c) a step of drying the finely split split material, and (d) applying an adhesive to the dried split material. The step of (e) arranging the slitting materials coated with the adhesive side by side in the longitudinal direction to form a single layer, and stacking the single layers into a plurality of layers, (f) the laminated slitting materials. The process of heating and pressing. 2. The monolayers according to claim 1, wherein each single layer is formed by arranging a predetermined length of slit material in parallel in the longitudinal direction, and ends of the single layers are joined to each other in the longitudinal direction of the slit material. A method for manufacturing a split piece laminate material, wherein the joining portions at the end portions of each of the single layers are configured so as not to overlap each other in the stacking direction of the single layers. 3. The method for producing a split piece laminate according to claim 2, wherein the planar shape of each single layer is a parallelogram. 4. The method for producing a split piece laminate material according to claim 1, wherein a glass fiber cloth is inserted between the single layers to be laminated. 5. The method for producing a split piece laminate material according to claim 2, wherein a glass fiber cloth is inserted between the single layers to be laminated. 6. The method for manufacturing a split piece laminate material according to claim 3, wherein a glass fiber cloth is inserted between the single layers to be laminated. 7. A single layer formed by arranging a slit material formed by splitting a raw material such as wood or bamboo in the longitudinal direction is joined in the horizontal and vertical directions, and each single layer is joined together. The horizontal joints of the layers are provided at positions apart from the joints of other layers that overlap the layer having the joints in the stacking direction of the single layer, and each subdivided material is solidified and bonded by an adhesive under pressure. A split piece laminated material that is formed. 8. The split piece laminate material according to claim 7, wherein a glass fiber cloth is inserted between the single layers to be laminated. 9. A means for splitting a raw material such as wood or bamboo in the longitudinal direction, a means for further splitting the split material obtained in the splitting process in the longitudinal direction, and drying the fine split material. The means, the means for applying the adhesive to the dried slitting material, and the slitting material coated with the adhesive are juxtaposed in the longitudinal direction to form a single layer, and the single layer is laminated into a plurality of layers. An apparatus for producing a split piece laminated material, comprising: means and means for heating / compressing the laminated finely divided materials. 10. A rotary blade comprising a pair of rotary blades facing each other and a drive source for the rotary blade, wherein the rotary blade comprises a rotary cylinder and circular blades provided in multiple stages around the entire circumference of the rotary cylinder. , Each blade of the circular blade in one rotary blade is made to project slightly between the blade edges of the circular blade in the other rotary blade, a raw material such as wood, bamboo, etc. to a predetermined width in the longitudinal direction Splitting device that splits into pieces. 11. The rotary blade according to claim 10, wherein each of the circular blades of the rotary blade is a double-edged blade having a blade edge angle of 20 degrees, the blade tip spacing is 10 mm, and the height from the rotary cylinder to the blade tip is 30 mm.
The cleaving device characterized in that 12. The rotary blade according to claim 10, wherein each circular blade of the rotary blade is a single blade having a blade edge angle of 20 degrees, a blade edge spacing of 4 mm, and a height from the rotary cylinder to the blade edge of 7.5 mm.
The cleaving device characterized in that