JPH0442964B2 - - 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 binding material was spread and oriented so that the strips of wood faced in a certain direction, and deposited on a caul board. Next, as a method for manufacturing a wood board-shaped body formed by pressure molding,
For example, a manufacturing method described in Japanese Patent Publication No. 37-14924 is known. However, in the conventional manufacturing method, the strips of wood are oriented in a certain direction, so although the mechanical strength in the oriented direction is increased, the mechanical strength in the direction perpendicular to the oriented direction is is small. 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 being time-consuming, there was a risk that the separate member would separate from the wood board and fall off. It is also possible to adjust the degree of orientation of the strips of wood at a predetermined position on the wood strip by adjusting the distance between the opposing slit plates; however, the amount of strips of wood passing between the slit plates This is not preferable because it causes a difference in density and thickness accuracy. (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 wood chip plate-like body having an oriented portion formed by being sequentially deposited on a caul plate located directly below the slit plate and moving at a constant speed along the width direction of the slit plate, and then pressure-formed; In the manufacturing method, the mutual spacing between the slit plates is set to be equal to or less than the average length of the wood strips, and the slit plates are deposited from the lower end of the desired slit plate onto the coal plate to the uppermost surface. While the vertical distance to the wood strips located is less than half the average length dimension of said wood strips, the wood strips that are deposited from the lower ends of the other remaining slit boards onto the coal board and located on the top surface The vertical distance to the wood strips is set to be greater than or equal to the average length of the wood strips, and the wood strips are dropped from between the slit plates to be partially oriented and deposited on the coal board, and the remaining wood strips on the coal board are It was decided that the wood strips would be piled up in a non-oriented manner. (d) Effects Therefore, according to the manufacturing method of the present invention, among the slit plates whose facing interval is equal to or less than the average length of the strips of wood, the coal that moves at a constant speed from the lower end of the desired slit plate The vertical distance to the topmost wood strip deposited on the board is less than half the average length of the wood strips. For this reason, only the strips of wood that are oriented on the desired slit plate while falling are deposited on the coal board, so that the oriented portion along the surface direction of the slit plate is partially attached to the desired position of the wood piece plate. This means that it can be formed in a specific manner. (e) Examples Examples of the present invention will be described below with reference to FIGS. 1 and 2. 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., phenol resin, urea resin, melamine resin, urea-melamine resin, etc.) or a hydraulic material (e.g., Portland cement, gypsum, 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. In particular, this is a step of orienting the wood strips 1 in a certain direction by the slit plate 6a during the fall, and sequentially depositing and forming them on the moving coal board 4 to form the forming mat 5. . The slit plates 6a and 6b are provided perpendicularly above the caul plate 4, and a plurality of slit plates 6a and 6b are arranged in parallel in the direction of movement of the caul plate 4 (direction of arrow d in FIG. 1). The slit plate 6a forming the orientation part 5a of the forming mat 5 is
The vertical distance b ₁ from the lower end to the wood strips deposited on the caul board 4 is set at less than half of the average length l of the wood strips, preferably from 30% to 40%. Furthermore, the non-oriented portion 5b of the forming mat 5
The vertical distance from the lower end of the slit plate 6b to the strip of wood deposited on the coal plate 4 is
b ₂ is set to be greater than or equal to the average length l of the strip of wood 1, but is preferably at least twice the average length l. Therefore, the orientation of the strips of wood passing between the slit plates 6b becomes random during the fall from when they pass through the slit plates 6 until they are deposited on the coal plate, so that they form non-oriented parts. . Also, the opposing distance a ₁ between the slit plates 6a and 6b
From the viewpoint of orientation efficiency and uniformity of dispersion, the average length of the strips of wood is set to be less than 1, but
Preferably less than half. The aforementioned slit plates 6a and 6b alternately reciprocate in the board width direction with respect to the other slit plates 6a and 6b facing each other, thereby preventing clogging of the wood strips and increasing the orientation efficiency. ing. Further, the call plate 4 may be made of an endless conveyor. The forming process is a process of pressure forming the forming mat 5 formed in the deposition process and curing the bonding material 2, and the oriented part 5a and the non-oriented part 5b are mixed at the boundary part when pressurized. As a result, it is formed as a transition part from an oriented part to a non-oriented part. After this, the manufacturing process is completed by curing. Note that the arrangement of the slit board according to the present invention is not limited to that of the above-described embodiment, and the vertical distance from the lower end of the slit board to the topmost strip of wood deposited on the coal board is By sequentially changing the length of the strip from more than the average length to less than half the average length, the degree of orientation of the strip of wood can be gradually changed, and sudden changes in strength can be avoided. Furthermore, depending on the location where the wood chip plate-shaped body is used, the above-mentioned vertical distance may be changed as appropriate to provide an oriented portion and a non-oriented portion. 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, phenolic resin is used as the binding material,
A phenolic resin corresponding to 10% of the total dry weight of the wood strip was added to the wood strip 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 arranged above the coal plate, and are all arranged in parallel to the direction of movement of the slit plates. and,
The 11 slit boards located in the center have a distance of 6 mm from their lower ends to the top strip of wood deposited on the coal board, forming an oriented part of the wood board. At the same time, the distance from the lower end of the remaining slit plate to the uppermost strip of wood deposited on the coal plate was 30 mm, so as to form a non-oriented portion of the wood piece plate. Note that the distance between the slit plates is all 6 mm.
It is becoming. Finally, in the forming process, the forming mat obtained in the deposition process is heated at a temperature of 130°C and under pressure.
The binding material was cured by heating and pressing at 20 kg/cm ² for 4 minutes to obtain a long wood board-like body with a cross section of 15 mm in thickness and 100 mm in width. Therefore, according to this embodiment, 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 both sides of this oriented part. was able to obtain. Next, the test results regarding the strength of this experimental example will be explained. In Test Example 1, the long side ends of the wood plate obtained in Experiment 1 were cut by 10 mm, and then a male fruit 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 placed side by side so as to face each other at intervals of 6 mm along the moving direction of the caul plate, and was deposited on the caul plate from the lower end. The oriented wood plate was dropped from between slit plates arranged so that the distance to the top strip of wood was 6 mm, deposited sequentially on a coal board, and then formed under the same conditions as Test Example 1. was used as Comparative Example 1, and a commercially available non-oriented particle board having the same composition as Test Example 1 was used as Comparative Example 2, and various tests were conducted on the samples obtained by applying the same processing as 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 1 is slightly lower than that of Comparative Example 1, but the male part strength and nail side resistance of Test Example 1 are The forces have approximately twice the mechanical strength as those of Comparative Example 1 and approximately similar mechanical strengths to those of 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 description, according to the present invention, the orientation can be improved by appropriately selecting the distance from the lower end of the slit board to the top strip of wood deposited on the coal board. Since a wood chip plate-like body having a non-oriented portion and a non-oriented portion can be formed in a single deposition process, it does not take much time and productivity is improved. Furthermore, if non-oriented parts are appropriately provided at both ends of the long sides of the wood strip, the interfacial strength of the strip of wood will improve, making cutting and nailing work possible, making it possible to use the base material such as floorboards. It is possible to obtain wood planks that can be used for. In addition, the wood chip plate-like material has the advantage that there is no variation in density or thickness accuracy, making it practical. Furthermore, according to the method of the present application, since the distance between the lower end of the slit plate and the caul plate can be changed sequentially, the transition between the oriented part and the non-oriented part can be made gradual, and sudden changes depending on the strength position can be avoided. be able to.

[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. 1... Wood strip, 2... Binding material, 3... Mixture, 6, 7... Slit board.

Claims (1)

[Scope of Claims] 1. A mixture formed by mixing a strip of wood and a binding material is dropped from between a plurality of slit plates arranged in parallel, and the mixture is placed directly below the slit plates, and A method for manufacturing a wood board having an oriented portion formed by sequentially depositing the wood pieces on a caul board moving at a constant speed along the width direction of the board and then press-forming the wood chips, wherein the opposing intervals between the slit boards are adjusted to The vertical distance from the lower end of the desired slit board to the topmost strip of wood deposited on the coal board shall be equal to or less than the average length of the strips. The vertical distance from the lower end of the remaining slit board to the topmost wood strip deposited on the coal board is equal to or less than half the average length of the wood strip. The method is characterized in that the strips of wood are arranged in a manner larger than the dimension, and are dropped from between the slit plates to be partially oriented and deposited on the coal board, and the strips of wood are deposited in a non-oriented manner on the remaining portion on the coal board. A method for producing a wood plate-like body.