JPH0416046B2 - - Google Patents

Description

[Detailed description of the invention]

(b) Industrial application field The present invention is a wood board-like body such as a particle board or a wood cement board suitable for structural members of buildings, furniture, etc., and in particular, a wood board-like body made of wood strips oriented in an arbitrary direction. The present invention relates to a method for manufacturing a wood board having an oriented portion and a non-oriented portion. (b) Prior art and its problems Conventionally, a mixture of strips of wood and a binder is spread so that the strips of wood are oriented in a certain direction, deposited on a coal board, and then processed. As a method for producing a wood plate-like body formed by pressure forming, for example,
A manufacturing method described in Japanese Patent Publication No. 37-14924 is known. However, in the conventional manufacturing method, all the wood strips are oriented in a certain direction, so although the mechanical strength in the direction of orientation is increased, the mechanical strength in the direction perpendicular to the direction of orientation is low. . For this reason, if cutting or nailing is performed on the periphery of a wooden board using conventional manufacturing methods, cracks tend to occur along the orientation direction of the wood strips, making it necessary to cut the real parts, etc. There was a problem that it could not be used as a base material for floorboards, etc. In order to solve this problem, it may be possible to attach a separate member to the side end of the wooden board that is less likely to crack during cutting or nailing, but this would make the manufacturing process complicated. In addition to this being undesirable, there was a risk that the separate member would separate from the wood board and fall off. (C) Means for Solving the Problems In view of the above-mentioned problems, the present invention provides a method in which a mixture of strips of wood and a binding material is dropped from between a plurality of slit plates arranged in parallel. , a method for manufacturing a wood board by sequentially depositing the pieces on a coal board and then press-forming the wood pieces, wherein the desired spacing between opposing slit plates is set to be less than half the average length of the previous wood strips. The structure is such that the spacing between the other opposing slit plates is equal to or larger than the average length of the strips of wood. (d) Effect Therefore, according to the manufacturing method of the present invention, among the strips of wood that fall from between the opposing slit plates, the strips of wood fall from between the opposing slit plates at intervals of half or less of the average length of the strips of wood. Only the fallen strips of wood will be oriented in the direction along the plane of the slit plate. (E) Embodiments Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4. The first embodiment generally consists of a strip of wood 1 and a binding material 2.
a mixing step of producing a mixture 3 by mixing the above, a deposition step of depositing the mixture 3 on a caul plate 4 to form a forming mat 5, and a forming step of compressing and shaping the forming mat 5. It consists of a process. The wood strips 1 used in the mixing process are:
Wood is processed into disk flakers, drum flakers,
It is obtained by cutting with a refiner or shaving machine, etc., and the external dimensions may vary depending on the tree species, cutting machine, cutting speed, etc., but the length is 2.
Use a piece cut to within the range of mm to 60 mm, width of 0.5 to 10 mm, and thickness of 0.1 to 3 mm. In the present invention, since there is a close relationship between the length of the wood strip and the degree of orientation, it is preferable to cut the wood strip so that it has a normal distribution within the above-mentioned range. The binding material 2 may be a thermosetting adhesive (e.g., phenolic resin, urea resin, melamine resin, urea-melamine resin, etc.) or a hydraulic material (e.g., Portland cement, plaster, etc.).
is used. The method of mixing the strip of wood 1 and the binder 2 is to spray the strip of wood 1 with the binder 2 as it falls, or to mix the strip of wood 1 and the binder 2 with a blender or mixer. A method of stirring and kneading may also be used. In the deposition step, the mixture 3 is sprinkled above an orienting machine (not shown), and as shown in FIG. This is a step in which the strips of wood 1 are oriented in a fixed direction by the slit plate 6 while falling, and are sequentially deposited and formed on the moving coal board 4 to form a forming mat 5. The slit plate 6 is provided perpendicularly above the call plate 4 and
A plurality of sheets are arranged in parallel along the moving direction (direction of arrow d in FIG. 1). The spacing _a1 between the slit plates 6 forming the orientation part 5a of the forming mat 5 is set to be less than half the average length l of the wood strips, preferably 30% to 40%. When the distance between the opposing slit plates 6 is 30% to 40% of the average length of the strip of wood 1, for example, the bending strength in the orientation direction and the bending strength in the direction perpendicular to the orientation direction are This is because when compared, the ratio is 2:1 to 4:1, and the desired performance can be exhibited. Furthermore, the non-oriented portion 5b of the forming mat 5
The spacing a ₂ between the slit plates 6 forming the slit plate 6 should be equal to or larger than the average length l of the strip of wood 1, preferably twice or more, to form an almost completely non-oriented portion. In addition, the distance b between the lower end of the slit plate 6 and the strip of wood 1 deposited on the coal board 4 and located on the top surface is set to be equal to or less than the average length l of the strip of wood, thereby increasing the orientation efficiency. However, the distance b is preferably less than half of the length l. Each of the slit plates 6 described above is alternately reciprocated in the direction of the plate surface relative to the other slit plates 6 facing each other, thereby preventing clogging of the wood strips and increasing the orientation efficiency. The forming step is a step of press-molding the forming mat 5 formed in the deposition step to harden the bonding material 2, and forms the oriented portion 5a and the non-oriented portion 5b.
When pressurized, they will be mixed at the boundary, and will be formed as a transition part from the oriented part to the non-oriented part. After this, the manufacturing process is completed by curing. As shown in FIGS. 3 and 4, the second embodiment differs from the first embodiment in that all the slit plates are arranged parallel to each other along the moving direction of the coal plate 4, and the slit plates are arranged parallel to each other along the moving direction of the coal plate 4. 5a and the non-oriented portion 5b, the slit plates 6 are arranged parallel to each other along the movement direction of the coal plate 4, and the slit plates 7 are arranged in parallel perpendicularly thereto. This is a case where oriented portions 5a and 5c in two directions and a non-oriented portion 5b are formed. That is, among the slit plates 6 vertically installed above the call plate (not shown), the slit plate 6 located in the center is arranged in parallel along the moving direction of the call plate, and While the spacing a ₃ is less than half the average length dimension of the wood strips,
The slit plates 7 located on both sides of the slit plate 7 are arranged perpendicularly to the slit plate 6, and
The spacing a ₄ is less than half the average length of the wood strips. The distance a ₅ between the outermost surface of the slit plate 6 and the inner end of the slit plate 7
shall be greater than or equal to the average length dimension l of the wood strips. Therefore, the wood piece plate-like body formed by the slit plates 6 and 7 is composed of orthogonal oriented parts 5a and 5c and a non-oriented part 5b, as shown in FIG. The rest is almost the same as the first embodiment described above, so
The explanation will be omitted. According to this embodiment, since the orientation portions are oriented in two directions, there is an advantage that a wide variety of combinations can be made and the applications are widened. Note that the arrangement of the slit plates according to the present invention is not limited to that of the above-mentioned embodiments, and the spacing between the opposing slit plates may be sequentially changed from less than half the average length of the strips of wood to more than the average length. It is also possible to avoid sudden changes in strength by gradually changing the degree of orientation.
Further, the above-mentioned spacing may be selected as appropriate depending on the location where the wood chip plate-shaped body is used. Next, an experimental example according to the present invention will be explained,
This includes a comparison with conventional examples. Experimental example 1 Wood strips were cut into lengths of 2.5~ by cutting lauan core logs with a drum flaker.
30.0mm (average length 15mm), width 0.5-2.5mm (average width
1.5 mm), thickness 0.2 mm to 1 mm (average thickness 0.5 mm), and 25% (number of pieces) of the total amount was used having an average length of 15 mm. Then, urea resin was used as the binding material, and urea resin corresponding to 10% of the total dry wood weight of the strip of wood was added to the strip of wood and kneaded to obtain a mixture. Next, in the stacking step, the mixture is spread above the orienting machine using a wood chip spreader, dropped between the slit plates described later, and deposited on the coal board in sequence to form a long forming pine with a thickness of 70 mm and a width of 120 mm. Formed. A plurality of slit plates in the orienting machine are vertically installed above the coal plate, and are all arranged in parallel to the direction of movement of the slit plates. The 11 slit plates located in the center face each other with an interval of 6 mm to form an orientation part of the wood chip plate, and the remaining slit plates have an interval of 15 mm.
They face each other and form a non-oriented portion of the wood plate. The distance between the lower end of the slit plate and the stacked strip of wood located on the uppermost surface is 6 mm. Finally, in the forming process, the forming mat obtained in the deposition process is heated at a temperature of 130°C and a pressure of 20°C.
The bonding material was cured by heating and pressing at Kg/cm ² for 4 minutes to obtain a long wooden board with a cross section of 15 mm in thickness and 100 mm in width. Therefore, according to this experimental example, a long wood plate-like body has an oriented part with a width of about 60 mm at the center of the cross section, and non-oriented parts with a width of about 30 mm on each side of this oriented part. I was able to get Next, the test results regarding the strength of this experimental example will be explained. In Test Example 1, after cutting the long side ends of the wooden plank obtained in Experiment 1 above in 10 mm increments, a phallic part consisting of a ridge with a thickness of 7 mm and a length of 8 mm was cut on one side. , A female part that can fit into the male part is formed on the remaining other part by cutting, and various tests are conducted on this,
The test results shown in Table 1 were obtained. For comparison, a mixture having the same composition as in Test Example 1 was dropped from between slit plates arranged parallel to the direction of movement of the caul plate, all at intervals of 6 mm, and placed on the caul plate. Comparative example 1 is an oriented wood board formed under the same conditions as test example 1 after being deposited sequentially, and comparative example is a commercially available non-oriented particle board having the same composition as test example 1. 2, and various tests were conducted on samples obtained by applying the same processing as in Test Example 1.

[Table] As is clear from the test results shown in Table 1, the bending fracture stress of the orientation method of Test Example is slightly lower than that of Comparative Example 1, but the male part strength and nail side resistance of Test Example 1 are has twice the mechanical strength of Comparative Example 1 and almost the same mechanical strength as Comparative Example 2. Therefore, Test Example 1 has the same strength as a non-oriented particle board at both ends, and has almost the same bending strength as an oriented wood board in the orientation direction. Because there is
It was found that the advantages of Comparative Example 1 and Comparative Example 2 were combined. (F) Effects of the Invention As is clear from the above explanation, according to the present invention, by appropriately selecting the facing interval of the slit plates, it is possible to obtain a wood chip plate-like body having oriented portions and non-oriented portions. Therefore, if the non-oriented portions are appropriately provided at both ends of the long sides of the wood chip board, cutting and nailing operations can be performed, and the material can be used for base materials such as floorboards. Furthermore, by appropriately combining the oriented portion and the non-oriented portion, there is an effect that a sudden change in strength can be avoided, and a wide variety of wood board-like bodies can be obtained depending on the usage conditions.

[Brief explanation of drawings]

1 and 2 show a first embodiment according to the present invention, and FIG. 1 is a schematic explanatory diagram showing a deposition process,
FIG. 2 is a partial perspective view of a wooden board, FIGS. 3 and 4 show a second embodiment of the present invention, and FIG.
The figure is a schematic explanatory view showing the arrangement of the slit plates, and FIG. 4 is a partial perspective view of the wood piece plate-like body. 1... Wood strip, 2... Binding material, 3... Mixture, 6, 7... Slit board.

Claims (1)

[Scope of Claims] 1. A mixture of a strip of wood and a binding material is dropped between a plurality of parallel slit plates, sequentially deposited on a caul plate, and then pressure-formed. In the method for producing a wooden board, the interval between desired opposing slit boards of the slit boards is set to be half or less of the average length of the wood strips; The oriented portion and the non-oriented portion are formed by arranging the opposing slit plates so that the interval is equal to or more than the average length of the strips of wood, and dropping the strip of wood from between the slit plates. A method for manufacturing a wood board.