JPH10138202A - Dehydrating device for veneer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the risk of destroying the knot by preventing application of excessive force on a knot inside a veneer even when the moisture in the veneer is eliminated by deforming the veneer in the thickness direction with pressure. SOLUTION: The distance between the circumferences of a steel roll 1 and a rubber roll 13 is set at 50% or less with respect to the thickness of a veneer P to be inserted. The circumference of the steel roll 1 is provided with a large number of spikes 6. The rubber roll 13 is covered with a urethane rubber 16C, which is a synthetic rubber, with a 80 degree or more rubber hardness by the thickness 10 times or more with respect to the difference between the veneer thickness and the above-mentioned distance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for dehydrating veneer veneer (hereinafter referred to as veneer) before drying obtained by cutting a log.

[0002]

2. Description of the Related Art As an apparatus for compressing and deforming a veneer to remove water content, there is an apparatus described in Japanese Patent Publication No. 52-9721. That is, the veneer has a thickness of 3 veneers.
In order to remove the water content by compressively deforming to a thickness of 0% to 60%, the distance t between a pair of rolls rotating in parallel with the rotation axis is set to 30% to 60% of the thickness of the single plate. Has been established.

[0003]

However, such a conventional technique has the following problems. When the interval t between the pair of rolls is 30% to 60% of the thickness of the veneer and the veneer is compression-deformed to a thickness of 30% to 60% of the veneer thickness, the pair of rolls is It must be made of a steel body that hardly deforms. When the veneer is carried in between the pair of rolls having the above-described configuration, all of the veneer portions in which the fiber direction is the carrying direction in the veneer and the knot portions where the fibers stand in the veneer thickness direction are all veneer. It is forcibly deformed from 30% to 60% of the thickness. As a result, an excessively large force is concentrated on the node, and the node is often destroyed. Also, if the distance is further reduced to increase the removal of water, the nodes are more destroyed.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, the distance between the respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven to rotate is set to be a single plate to be carried in. Is arranged at a length corresponding to 50% or less of the thickness of one of the rolls, one of the rolls has a flat peripheral surface, and the other roll has a central portion made of steel and has a hardness of at least 80 degrees around the periphery. Is coated with a thickness of 10 times or more a value obtained by subtracting the interval from the single plate thickness. Further, in the above configuration, in order to increase the removal of water, the interval may be set to a length corresponding to 29% or less of the thickness of the veneer and / or the hardness of the synthetic rubber may be set to 94 degrees or more. In addition, one of the rolls may be provided with a large number of piercing bodies whose height in the radial direction of the roll from the circumferential surface is equal to or less than the interval. When there is no piercing body, both of the pair of rolls may be coated with synthetic rubber. However, the sum of the thicknesses of the two synthetic rubbers may be at least 10 times the value obtained by subtracting the interval from the single plate thickness. Further, at least one portion of the pair of rolls in the axial direction of the rolls may be rotatably supported by a bending support, and an injection hole for injecting compressed air may be provided in the bending support.

When a veneer is carried between the rolls, most of the veneer in which the direction of the fibers other than the knots is the carry-in direction is usually compressed and deformed with synthetic rubber, and the fibers are moved in the thickness direction of the veneer. Most of the knotted joints are compressed and deformed by the synthetic rubber and pass between the rolls. Therefore, no excessive force is applied to the knots, so that the knots are less likely to be destroyed, and the normal portion of the veneer is dehydrated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below in detail with reference to the drawings when the thickness of a veneer is 4 mm.

As shown in FIG. 1, P is a single plate to be carried in. 1 is a steel roll which is one of the rolls. The steel roll 1 is composed of a shaft 3, a piercing tube member 5, and a bending support 19 described later. The shaft 3 has a key groove (not shown) having the same width as a key groove 2B of the tube member 2 shown in FIG. And an electric motor (not shown) is connected thereto and further rotatably mounted on a machine base (not shown).

The piercing cylinder member 5 has a piercing body 6 shown in FIG. 4 which is an enlarged view of a portion A in FIG. 1 on the peripheral surface of the cylindrical tubular member 2 shown in FIG. It has a pitch of about 4.1 mm, a pitch of about 4.1 mm in the rotation direction, a pitch of 2 mm in the direction perpendicular to the rotation, and is provided with a large number of left-handed threads inclined 26 degrees in the rotation direction. When the piercing body 6 is viewed from the direction E, as shown in FIG. 4b, the trapezoid has an upper side of 0.2 mm, and the angle formed by the two oblique sides is 56 degrees. When viewed from the direction G, as shown in FIG. 4D, the trapezoid has an upper side of about 0.41 mm, and the angle formed by both oblique sides is about 134 degrees. Further, the material of the cylindrical member 2 shown in FIG. 2 is stainless steel SUS420J2, and a through hole 2A and a key groove 2B that engage with the shaft 3 are provided in the center portion, and the vicinity of the through hole 2A is from the end surface of the cylindrical member 2. I'm dented. Then, as shown in FIG. 1, a plurality of piercing cylinder members 5 are fixed to the shaft 3 with a key (not shown) in a state where a gap S is opened.

In FIG. 1, reference numeral 13 denotes a rubber roll, which is the other roll, and its rotation axis is parallel to the steel roll 1. The rubber roll 13 is composed of the shaft 15 and the rubber cylinder 1.
The shaft 15 is provided with a key groove (not shown) having the same width as the key groove 16B of the cylindrical member 16 shown in FIG. 3 described later, and the shaft 15 is rotatable. (Not shown). The cylindrical member 17 with rubber is formed by covering the peripheral surface of the cylindrical member 16 shown in FIG. 3 with a 45 mm thick urethane rubber 16C having a rubber hardness of 98 degrees, which is a synthetic rubber. Further, the material of the cylindrical member 16 shown in FIG. 3 is stainless steel SUS420J2, and a through hole 16A and a key groove 16B for engaging with the shaft 15 are provided at the center portion. I'm dented.
In addition, the length of the rubber-attached cylindrical member 17 in the rotation orthogonal direction is the same as the length of the piercing cylinder member 5 in the rotation orthogonal direction. As shown in FIG. 1, a plurality of cylindrical members 17 with rubber are fixed to the shaft 15 with a key (not shown) with a gap S opened.

A flat gear (not shown) is mounted on the shaft 3, and a flat gear (not shown) is mounted on the shaft 15 so as to mesh with the flat gear.

FIG. 1 shows a gap S between the cylindrical members 17 with rubber.
As shown in FIG. 5 which is a partial cross-sectional view of a cross section passing through the axis of the shaft 3 from the axis of the shaft 3,
The shaft 15 is rotatably supported through the shaft. The deflection support 19 is attached to a machine base (not shown). In addition, although the upper and lower sides are reversed, the gap S between the piercing cylinder members 5 and 5 is similarly set.
In addition, the flexure receiving base 19 rotatably supports the shaft 3 via the bearing 19A. As shown in FIG. 6 which is a partial cross-sectional view taken along the line EF in FIG. 5, an injection hole 19D for injecting compressed air is provided on the bending support 19 so as to be directed toward the veneer P passing through the gap S. From the upper side to the upper side.

Then, as shown in FIG. 5, the interval between the peripheral surface of the piercing cylinder 5 and the peripheral surface of the rubber-coated cylinder 17 is arranged to be 0.8 mm in length.

Next, the operation of the embodiment configured as described above will be described. As shown in FIG. 1, a veneer P whose tree type is a radiator pine is carried between the rotating steel roll 1 and rubber roll 13 in the fiber direction. Most of the normal portions of the veneer P where the fiber direction other than the knots are the carry-in direction are compression-deformed with urethane rubber, and most of the knots where the fibers stand in the thickness direction of the veneer P As the urethane rubber is compressed and deformed and passes between the rolls, the moisture contained in the veneer P is sequentially removed to the upper side in the transport direction, and is carried out to the next step. Further, water generated and / or collected in the portion of the veneer P located in the gap S is
The compressed air injected from the injection hole 19D shown in FIG. 6 hardly moves on the veneer in the transport direction from between the rolls.

By repeating the above operation, most of the veneers P which are successively loaded are compressed and deformed with urethane rubber in most portions of the veneer P where the fiber direction other than the nodes is the loading direction. Most of the nodes where fibers stand in the thickness direction of P have urethane rubber compressed and deformed and pass between the rolls. Therefore, no excessive force is applied to the knots, so that the knots are less likely to be destroyed, and the normal portion of the veneer is dehydrated. Experiments with the above configuration show that the initial moisture content is 159%.
After the moisture removal of the veneer, the moisture content was 72%, and the initial moisture content was 166.
% Of veneer after moisture removal, moisture content 74%, initial moisture content 15%
9% veneer after dewatering 70% moisture content, initial moisture content 1
A veneer of 35% has a water content of 70% after moisture removal, a veneer with an initial moisture content of 172% has a moisture content of 76% after moisture removal, and a veneer with an initial moisture content of 185% has a moisture content of 74% after moisture removal. , The value of.

In the above embodiment, the hardness of the urethane rubber was set to 90 degrees, 95 degrees without changing the conditions other than the urethane rubber.
If you experiment at degrees, 98 degrees, 100 degrees, and 110 degrees,
At 95 degrees and 98 degrees, water removal is good and breakage of the nodes is small. 90 degrees is less broken than 95 degrees and 98 degrees, but the water removal is not enough. 100 degrees and 110 degrees are better at removing water than 95 degrees and 98 degrees, but breakage of the nodes is increased. Also, when comparing the thickness of the urethane rubber between 25 mm and 45 mm with urethane rubber having a hardness of 98 degrees, the removal of water is better at 25 mm, but breakage of the knot is 45 mm.
There are few millimeters.

Further, as described above, since the injection hole 19D is provided in the bending support 19, the injection position of the compressed air is stabilized, and the injection position is located in the gap S without obstructing the single-plate conveyance path. Moisture generated and / or collected at the portion of the veneer P hardly moves on the veneer in the transport direction from between the rolls due to the compressed air injected from the injection hole 19D.

In the embodiment, as shown in FIG. 5, the interval between the peripheral surface of the piercing cylinder member 5 and the peripheral surface of the rubber-coated cylinder member 17 is 0.8 mm long, that is, the thickness of the so-called single plate P is 4 mm. Although arranged at 20% of the millimeter, according to experiments, it is sufficient that the thickness is 50% or less of the thickness of the veneer. In order to increase the removal of water, the content is preferably 29% or less.

Although a large number of piercing bodies 6 are provided in the piercing cylinder member 5 of the embodiment, the piercing body may not be provided. However, if the piercing member is provided, the single plate carried between the rolls can be hardly stretched in the direction perpendicular to the conveyance. If the height of the piercing body in the radial direction is 0.5 mm or less, the veneer is more easily peeled off than the piercing body when the veneer is carried out from between the rolls.

If there is no piercing body, both of the pair of rolls may be coated with urethane rubber. However, the sum of the thicknesses of the two urethane rubbers may be at least 10 times the value obtained by subtracting the interval between the pair of rolls from the thickness of the veneer. When a pair of rolls is coated with urethane rubber having a hardness of 95 degrees at a thickness of 20 mm each, the interval between the rolls is set to 35% of the thickness of the veneer, and the experiment is performed using a radiata pine having a thickness of 4 mm per veneer. A veneer with an initial moisture content of 148% has a moisture content of 73% after removal of moisture, a veneer with an initial moisture content of 128% has moisture content of 79% after removal of moisture, and a veneer with an initial moisture content of 139% has moisture removal. A veneer having a water content of 85% and an initial water content of 147% has a water content of 82% after removing water, and a veneer having an initial water content of 135% has a water content of 80% and a water content of 162% after removing water.
After the removal of moisture, the veneer had a water content of 78%.

The hardness of the urethane rubber of the embodiment is 98 degrees, but according to experiments, the hardness may be 80 degrees or more. In order to increase the amount of water removed, 94 degrees or more is preferable.

The thickness of the urethane rubber of the embodiment is 45 mm.
Peripheral surface of piercing tubing material 5 and rubbered cylindrical material 1 from veneer P thickness 4 mm
It is 14 times the value obtained by subtracting 0.8 mm from the circumferential surface of No. 7, but according to experiments, if it is 10 times or more, breakage of the knot is small.

According to the present invention, when a veneer is transported between a pair of rolls, most of the veneer in which the fiber direction other than the knots is the transport direction is compressed and deformed with synthetic rubber, and the veneer is vulcanized. Most of the nodes where the fibers stand in the thickness direction of the plate are compressed and deformed by the synthetic rubber and pass between the rolls. Therefore, since no excessive force is applied to the node, the node is less likely to be broken, and moreover, the ordinary portion of the veneer is removed with a large amount of moisture.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a partial explanatory view of the embodiment.

FIG. 3 is a partial explanatory view of the embodiment.

FIG. 4 is an enlarged view of a portion A in FIG. 1;

FIG. 5 is a partial sectional view of a part of the steel roll 1 and the rubber roll 13 cut in an axial direction.

FIG. 6 is a partial cross-sectional view taken along EF in FIG. 5;

[Explanation of symbols]

 1 steel roll 5 piercing cylinder 13 rubber roll 17 rubber cylinder

Claims (10)

[Claims] An interval between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 50% or less of a thickness of a veneer veneer to be carried in. One roll has a flat peripheral surface, and the other roll has a central portion made of steel, and a synthetic rubber having a hardness of 80 degrees or more is provided at a distance from the veneer veneer plate thickness. A veneer veneer dehydrator, wherein the veneer is coated with a thickness of 10 times or more the value obtained by subtraction. 2. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 50% or less of a thickness of a veneer veneer to be carried in. The pair of rolls have a flat peripheral surface, a central portion made of steel, and a periphery covered with synthetic rubber having a hardness of 80 degrees or more, and the total thickness of both synthetic rubbers is The value obtained by subtracting the interval from the veneer veneer thickness is 10
A veneer veneer dehydrator, characterized in that the number is twice or more. 3. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 50% or less of a thickness of a veneer veneer to be carried in. The one roll is provided with a large number of piercing bodies whose height in the radial direction of the roll from the circumferential surface is equal to or less than the interval on the circumferential surface, and the other roll has a steel center portion. A veneer veneer dehydration apparatus, wherein the periphery is covered with a synthetic rubber having a hardness of 80 degrees or more and a thickness of 10 times or more a value obtained by subtracting the interval from the veneer veneer thickness. 4. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is set to a length corresponding to 50% or less of a thickness of a veneer veneer to be carried in. One roll has a flat peripheral surface, and the other roll has a central portion made of steel, and a synthetic rubber having a hardness of 80 degrees or more is provided at a distance from the veneer veneer plate thickness. The roll is coated with a thickness of 10 times or more of the subtracted value, and the pair of rolls is rotatably supported at at least one position in the axial direction of the rolls by a flexure cradle, and compressed air is further supplied to the flexure cradle. A veneer veneer dehydrator, characterized by having an injection hole for injection. 5. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 50% or less of a thickness of a veneer veneer to be carried in. The pair of rolls have a flat peripheral surface, a central portion made of steel, and a periphery covered with synthetic rubber having a hardness of 80 degrees or more, and the total thickness of both synthetic rubbers is The value obtained by subtracting the interval from the veneer veneer thickness is 10
At least one portion of the pair of rolls in the axial direction of the rolls is rotatably supported by a bending cradle, and an injection hole for injecting compressed air is further provided in the bending cradle. A veneer veneer dehydrator. 6. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is set to a length corresponding to 29% or less of a thickness of a veneer veneer to be carried in. One roll has a flat peripheral surface, and the other roll has a central portion made of steel, and a synthetic rubber having a hardness of 94 degrees or more is provided around the periphery of the veneer veneer at a distance greater than the thickness of the veneer veneer. A veneer veneer dehydrator, wherein the veneer is coated with a thickness of 10 times or more the value obtained by subtraction. 7. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 29% or less of a thickness of a veneer veneer to be carried in. The pair of rolls have a flat peripheral surface, a central portion made of steel, and a synthetic rubber having a hardness of 94 degrees or more coated on the periphery. The total thickness of both synthetic rubbers is The value obtained by subtracting the interval from the veneer veneer thickness is 10
A veneer veneer dehydrator, characterized in that the number is twice or more. 8. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 29% or less of a thickness of a veneer veneer to be carried in. The one roll is provided with a large number of piercing bodies whose height in the radial direction of the roll from the circumferential surface is equal to or less than the interval on the circumferential surface, and the other roll has a steel center portion. A veneer veneer dehydrating apparatus, wherein a surrounding portion of the veneer veneer is coated with a synthetic rubber having a hardness of 94 degrees or more, the thickness being 10 times or more a value obtained by subtracting the interval from the veneer veneer thickness. 9. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is disposed at a length corresponding to 29% or less of a thickness of a veneer veneer to be carried in. One roll has a flat peripheral surface, and the other roll has a central portion made of steel, and a synthetic rubber having a hardness of 94 degrees or more is provided around the periphery of the veneer veneer at a distance greater than the thickness of the veneer veneer. The roll is coated with a thickness of 10 times or more of the subtracted value, and the pair of rolls is rotatably supported at at least one position in the axial direction of the rolls by a flexure cradle, and compressed air is further supplied to the flexure cradle. A veneer veneer dehydrator, characterized by having an injection hole for injection. 10. A distance between respective peripheral surfaces of a pair of rolls whose rotation axes are parallel and at least one of which is driven and rotated is arranged at a length corresponding to 29% or less of a thickness of a veneer veneer to be carried in. The pair of rolls have a flat peripheral surface,
In addition, the center portion is made of steel, and the periphery is covered with synthetic rubber having a hardness of 94 degrees or more, and the total thickness of both synthetic rubbers is 1 which is a value obtained by subtracting the interval from the veneer veneer thickness.
0 or more times, and the pair of rolls are rotatably supported by a bending cradle at least at one location in the axial direction of the rolls, and further provided with an injection hole for injecting compressed air into the bending cradle. A veneer veneer dehydrator, characterized in that: