JP3715048B2 - Wood flake orientation device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wood flake orientation apparatus for producing a high-strength wood material using wood flakes as a constituent material.
[0002]
[Prior art and problems to be solved by the invention]
Conventionally, as a wood flake aligning device, for example, from above a plurality of aligning blades arranged in parallel, wood flakes pre-applied with an adhesive are sprayed and allowed to fall naturally, and are passed between the aligning blades for orientation. There is something to do. According to this wood flake orientation device, a mat in which the length directions of the wood flakes are generally aligned is formed, and a wood board generally called OSB is obtained by hot pressing this with a press. Since this OSB is superior in strength to a non-oriented wood laminar laminate, it is used as a structural material for architecture, as is the case with plywood.
[0003]
However, when the above-mentioned wood flake orientation device is used, since the fallen wood flakes are deposited in a state of falling down horizontally, the cross section of the obtained wood board (OSB) is layered and subjected to a large shear stress In addition, a continuous fracture surface occurred. In addition, the wood flakes may slip when dropped, and there is a problem that the degree of orientation of the wood flakes becomes insufficient.
[0004]
In view of the above problems, an object of the present invention is to provide a wood flake orientation apparatus for pressing a wood flake in a standing state.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a wood flake orientation device according to the present invention has an orientation endless belt in which an orientation plate is erected at a predetermined pitch on an outer peripheral surface and a substantially L-shaped conveying path is formed, and the orientation endless The belt comprises a substantially L-shaped casing that is formed along the outer peripheral surface of one side of the belt and has an inner peripheral surface that is in sliding contact with the peripheral edge of the alignment plate, and is formed by the alignment endless belt and the casing. The wood flakes are sprayed from the upper opening, and the wood flakes deposited on the orientation plate are conveyed to stand up.
[0006]
A preliminary orientation machine in which a plurality of orientation blades are arranged in parallel at a predetermined pitch may be disposed above the upper opening.
[0007]
You may provide the extrusion machine which protrudes the standing wood thin piece located in the horizontal part of the said orientation machine to the horizontal direction orthogonal to the conveyance direction of an orientation machine.
[0008]
The orientation machine may extrude a piece of wood that stands up from the opening at the front end of the horizontal part.
[0009]
Connected to the orienting machine is a conveying machine composed of first and second conveying conveyors arranged on the same straight line, and the conveying speed of the second conveying conveyor is lower than the conveying speed of the first conveying conveyor. You may keep it.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment according to the present invention will be described with reference to the accompanying drawings of FIGS.
As shown in FIG. 1, the wood flake orientation apparatus according to this embodiment includes an orientation machine 10 that orients the wood flakes, an ejector 20 that projects the wood flakes oriented by the orientation machine 10 to the side, and the ejector. 20 is configured with a conveying machine 30 that conveys the wood flakes protruding to 20 to a press stand. Note that the orientation machine 10 and the ejector 20 may be integrated.
[0011]
As shown in FIG. 2, the orienting machine 10 includes an orienting endless belt 11 and a guide casing 15. The orientation endless belt 11 is driven by rollers 12a and 12b disposed at both ends, and has a substantially L-shaped conveying path via a roller 12c disposed at an intermediate portion. Further, the orientation endless belt 11 has an orientation plate 13 erected at a predetermined pitch on the outer peripheral surface thereof.
A protrusion (not shown) is juxtaposed on the inner peripheral surface of the endless belt 11 at a predetermined pitch, while a claw portion that engages and drives the protrusion on the outer peripheral surface of the roller. (Not shown) is projected.
[0012]
The guide casing 15 has an inner peripheral surface that is in sliding contact with the peripheral edge of the orientation plate 13, and is formed in an approximately L shape so as to follow the outer peripheral surface on one side of the orientation endless belt 11. In the guide casing 15, a part of the side wall forming the horizontal portion 10 b of the orientation machine 10 is cut off, and the side edge portion of the orientation plate 13 is exposed. Furthermore, the front end of the horizontal portion of the orientation machine 10 is open, and the receiving plate 14 is rotatably provided.
[0013]
Therefore, as shown in FIG. 3, when the wood flakes 40 are spread on the upper opening 16 of the orientation machine 10, the wood flakes 40 are deposited on the orientation plate 13, and the vertical portion 10 a of the orientation machine 10 is lowered. And the wood flake 40 stands up by changing the moving direction of the orientation endless belt 11 to the horizontal direction via the roller 12c. Thereafter, the wood flakes 40 are conveyed to the front end side of the horizontal portion 10b of the orientation machine 10 with the wood flakes 40 standing upright. For this reason, the orientation plate 13 is preferably made of a sticky material having a small friction coefficient, and may be formed of, for example, metal or reinforced plastic. Furthermore, the outer dimensions, pitch, and the like of the orientation plate 13 may be appropriately selected according to the shape and size of the casing 15, the shape and size of the wood slice 40 to be oriented, the type of adhesive used, and the like.
[0014]
In addition, in order to manufacture a uniform product, it is necessary to convey the wood flakes 40 without a gap. For this reason, it is preferable that the laminated or raised wood flakes 40 can be transported while holding the orientation plate 13 with an appropriate pressure.
Further, the inclination angle of the vertical portion 10a is not necessarily a right angle, and the inclination angle may be changed as necessary.
[0015]
The wood flake 40 is not limited to any tree species, but a thickness of 0.1 to 3 mm is appropriate, and a piece to which a binder is added in advance while stirring is used. Examples of the binder include phenol resin-based, melamine resin-based, urea resin-based, isocyanate-based thermosetting adhesives, and mixtures thereof.
[0016]
The extruding machine 20 is for transferring the wood flakes 40 raised by the orientation machine 10 to the conveying machine 30. Therefore, the ejector 20 has at least one piston (not shown) that can reciprocate in the horizontal direction. At the tip of the piston, a press plate (not shown) is provided that can project the wood flake 40 in one section partitioned by the orientation endless belt 11 and the two orientation plates 13 and 13. .
Accordingly, the piston of the ejector 20 reciprocates, so that the wood flakes 40 in one section partitioned by the orientation endless belt 11 and the two orientation plates 13 and 13 remain standing. Protruded at 30.
[0017]
The pitch and moving speed of the piston, the external dimensions and material of the press plate can be appropriately selected according to the shape and size of the casing 12, the shape of the wood flake 40, and the like, as with the orientation machine 10. Moreover, although the said protrusion machine 20 is arrange | positioned beside the orientation machine 10, it does not necessarily need to be integrated. Further, when there are a plurality of the pistons, they may be reciprocated all at once, or may be reciprocated one by one.
[0018]
The conveying machine 30 is for conveying the wood flakes 40 projected from the orienting machine 10 by the ejecting machine 20 to the press table 41 shown in FIG. For this reason, the 1st conveyance conveyor 31 and the 2nd conveyance conveyor 32 are arrange | positioned on the same straight line. Further, guide plates 33 and 33 for preventing the upright wood flakes 40 from being tilted are provided in parallel on both side edges of the upper surfaces of the first and second conveyors 31 and 32.
However, the transport speed of the second transport conveyor 32 is slower than the transport speed of the first transport conveyor 31. This is to convey the wood flakes 40 protruding in a standing state to the press table 41 without any gaps.
[0019]
The wood flakes 40 transported by the transport machine 30 are guided by a press table 41 and then pressed by a press 42 as shown in FIG. Examples of the pressing method for heating and pressing the erected wood flake 40 include existing methods such as a hot platen press and a steam injection press. However, if an internal heating method such as high-frequency heating is used in combination with these methods, Further, a wooden molding material having a uniform strength can be obtained.
In addition, although the main pressing direction is an up-down direction, you may press simultaneously from the side with the pressure of the grade which can prevent the inclination of the timber flakes 40.
[0020]
In the present embodiment, the case where the standing wood flakes 40 are sequentially ejected from the orientation machine 10 to the transport machine 30 and continuously transported and manufactured is described, but the present invention is not limited thereto, and the transport machine 30 is not used. You may manufacture every lot.
[0021]
Moreover, you may extrude from the front-end | tip opening part of the horizontal part 10a of the orientation machine 10 not only when the standing wood flake 40 is protruded with an extrusion machine. In this case, if the standing wood flakes 40 are pressed against the orientation plate with an appropriate pressure, the standing wood flakes are less likely to tilt. For this reason, a batch system in which the orientation endless belt 11 is temporarily stopped and the standing wood flakes 40 are taken out and then pressed is effective.
[0022]
Further, a pre-orienting machine (not shown) in which a plurality of orienting blades are arranged in parallel is arranged above the upper opening 16 of the orienting machine 10, and the wood flakes are moved in the fiber direction by passing between the orienting blades. It is preferable to disperse in the upper opening 16 of the aligning machine 10 after aligning in advance. This is because when a relatively thick wood mat is formed, regulation in the thickness direction is loosened, and the degree of orientation of the wood flakes is slightly reduced.
[0023]
【Example】
(Example 1)
A slice of Baitsuga slice having a thickness of about 0.5 mm was appropriately cut to obtain a wood flake having a random shape with a length of 10 cm or less in the fiber direction and a length of 5 cm or less in the direction perpendicular to the fiber. While stirring the wood flakes, 5% by weight of MDI adhesive diluted with acetone to a concentration of 30% was added and adhered. Next, the film was oriented by the orientation machine shown in FIG. 2 and lowered while being deposited to a thickness of about 50 mm. Furthermore, the wood flakes were erected by changing the conveying direction from the vertical direction to the horizontal direction. Then, it moved to the press stand with the conveyance conveyor, and positioned to the press stand.
[0024]
The orientation machine has an orientation plate erected in parallel at a pitch of 200 mm on the outer peripheral surface of an orientation endless belt having a width of 1,000 mm and a total length of 7,000 mm. The orientation plate is made of aluminum having a thickness of 5 mm, a height of 50 mm, and a width of 980 mm. The oriented endless belt was moved at a speed of 120 cm / min.
[0025]
Then, as shown in FIG. 4A, the wood flakes 40 in the standing state are hot-pressed with a press table 41 and a press 42 at a temperature of 170 ° C. and a pressure of 30 kgf / cm ² for 20 minutes, so that FIG. A plate-like body 43 having a thickness of 12 mm and a specific gravity of 0.71 shown in the schematic sectional view of b) was obtained, and this was used as a sample. The bending Young's modulus, bending strength, and water absorption thickness expansion coefficient of this sample were measured. The measurement results are shown in the chart of FIG.
[0026]
(Comparative Example 1)
A deposit having a thickness of 40 mm is obtained by simply letting it fall and depositing without using the orientation machine, and this is pressed under the same conditions as in the first embodiment as shown in FIG. 5 (a). 5B, a plate-like body 44 having a thickness of 12 mm and a specific gravity of 0.73 shown in the schematic cross-sectional view was obtained, and this was used as a sample. The bending Young's modulus, bending strength, and water absorption thickness expansion coefficient of this sample were measured. The measurement results are shown in the chart of FIG.
[0027]
As is apparent from the measurement results shown in FIG. 6, it was found that Example 1 was superior to Comparative Example 1 in all measurement results in bending Young's modulus, bending strength, and water absorption thickness expansion coefficient. .
[0028]
【The invention's effect】
As is clear from the above description, according to the wood flake orientation device of claim 1 of the present invention, the wood flakes deposited so as to be laminated can be continuously raised, and the productivity is remarkably improved. .
Furthermore, by pressing and integrating the erected wood flakes with a press, it has a corrugated structure laminated in the width direction, and it is difficult to generate a continuous fracture surface due to shear fracture, bending Young's modulus, A woody molded body with high bending strength is obtained.
In particular, the directionality of the wood component of the wood flakes is dispersed by bending and pressing the wood flakes raised by the wood flake orientation device of the present application. For this reason, expansion recovery (so-called spring bag) in the press direction due to water absorption expansion is reduced, and the water absorption thickness expansion coefficient is lower than that of a normal wooden molded body that is simply horizontally oriented.
According to the second aspect, by orienting the wood flakes in a predetermined direction in advance using a preliminary orientation machine, the orientation efficiency can be improved, and the uprightness of the wood flakes can be increased.
According to the third aspect, the wood flakes can be protruded in the horizontal direction while standing up, the transfer work is simplified, and the productivity is further improved.
According to the fourth aspect, the wood flakes can be taken out in a lump in a standing state without using another carry-out device.
According to the fifth aspect, since the transport speed of the first transport conveyor is faster than the transport speed of the second transport conveyor, the standing rear wood flakes are pressed against the front wood flakes, and there are gaps in the transport direction. There is an effect that a woody compact having a dense structure is obtained.
[Brief description of the drawings]
FIG. 1 shows a wood flake orientation apparatus according to the present invention, in which FIG. 1 (a) is a front view and FIG. 1 (b) is a plan view.
FIG. 2 is a perspective view of an orientation machine.
FIG. 3 is a schematic front view of an orientation machine.
FIGS. 4A and 4B show a pressing process of standing wood flakes. FIG. 4A is a front view and FIG. 4B is a schematic sectional view of a sample obtained by pressing.
FIGS. 5A and 5B show a pressing process of a piece of wood that is naturally dropped and oriented. FIG. 5A is a front view, and FIG. 5B is a schematic cross-sectional view of a sample obtained by pressing.
6 is a chart showing measurement results of Example 1 and Comparative Example 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Wood orientation apparatus, 11 ... Orientation endless belt, 12a, 12b, 12c ... Roller, 13 ... Orientation plate, 14 ... Receiving plate, 15 ... Casing, 16 ... Upper opening, 20 ... Extruder, 30 ... Conveyor, 31, 31 ... 1st, 2nd conveyance conveyor, 40 ... Wood thin plate, 41 ... Press stand, 42 ... Press.

Claims (5)

An alignment endless belt that stands upright at a predetermined pitch on the outer peripheral surface and forms a substantially L-shaped conveying path, and is formed along the outer peripheral surface on one side of the alignment endless belt, and the alignment plate A thin L-shaped casing having an inner peripheral surface that is in sliding contact with the peripheral edge of the slab. A wood flake orientation device characterized by conveying and standing a wood flake. The wood flake orientation apparatus according to claim 1, wherein a pre-orientation machine in which a plurality of orientation blades are arranged in parallel at a predetermined pitch is disposed above the upper opening. The wood flake orientation apparatus according to claim 1 or 2, further comprising an extruding machine that projects the standing wood flakes positioned in a horizontal portion of the orientation machine in a lateral direction perpendicular to a conveying direction of the orientation machine. The wood flake orientation apparatus according to claim 1 or 2, wherein the orientation machine pushes out a wood flake standing up from a front end opening of the horizontal portion. Connected to the orienting machine is a conveying machine that is composed of first and second conveying conveyors arranged on the same straight line, and the conveying speed of the second conveying conveyor is slower than the conveying speed of the first conveying conveyor. The wood flake orientation apparatus according to any one of claims 1 to 4, characterized in that:

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