JPH05309607A - Veneer gluing method in production of plywood made of even-number veneers - Google Patents

Abstract

PURPOSE:To substantially uniformize an adhesive coating amount on the top and rear surfaces of a veneer and that between veneers to reduce an adhesive consumption amount by a method wherein a gap of a doctor roll to an application roll respectively disposed on the top and rear sides of the veneer can be appropritely changed. CONSTITUTION:On one side of a veneer 51, a first application roll 3 and a first doctor roll 15 are disposed, and on the other side, a second application roll 5 and a second doctor roll 33 are disposed. By changing a gap between the doctor roll 15 and the application roll 3 and a gap between the doctor roll 33 and the application roll 5, the amount of adhesive from adhesive pans 31, 46 can be incerased and decreased. After an appropriate amount of the adhesive is applied on each surface of the veneer 51, a gap of the doctor roll 15 to the application roll 3 is adjusted, and the adhesive is applied on the top surface of a veneer 53 to be overlapped on the veneer 51 by the application roll 3 by the amount remaining after the coating of the adhesive on the veneer 51. The adhesive is not applied at all to a non-bonding surface of the veneer 53. Therefore, a set of veneers forming a plywood are bonded through a uniform amount of adhesive at each surface, and an adhesive consumption amount can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a veneer veneer gluing method (hereinafter, veneer veneer is referred to as veneer) when manufacturing an even-numbered plywood.

[0002]

2. Description of the Related Art As is well known, a conventional plywood is manufactured by laminating and bonding an odd number of veneers in a relationship in which fibers of each are orthogonal to each other.

In the above-mentioned odd-numbered plywood, for example, a three-ply plywood, an adhesive is applied to the front and back surfaces of the middle plate by passing the middle plate between coating rolls arranged on the front and back sides of the middle plate, respectively. After applying the above, the intermediate plate is laminated on one original plate on which no adhesive is applied, and the work of laminating two original plates on which no adhesive is applied is sequentially repeated. I am working on plywood.

In the above plywood, when the middle plate has defects such as hollow holes such as node holes and irregularities due to cutting defects, the thickness of the original plate laminated and adhered to the surface of the middle plate is equal to the middle plate. Since it is extremely thin as compared with the above, the above-mentioned drawbacks of the intermediate plate are likely to appear directly on the surface of the original plate, and thus the plywood, which is a factor that deteriorates the quality of the plywood.

This disadvantage is caused by using, for example, two single plates each having an intermediate plate having a thickness half the thickness required as the intermediate plate, and arranging the single plate having less defects on the surface side of the two. Although it is possible to solve it by configuring, when the two veneers constituting the middle plate are respectively glued by the above-mentioned conventional veneer gluing method, an almost equal amount of adhesive is applied to the front surface and the back surface of each veneer. Since these are applied, when these single plates are laminated to form an intermediate plate, between the two single plates forming the intermediate plate, there is almost twice as much adhesive as the front surface and the back surface of the intermediate plate. Will be applied.

Therefore, when the assembled plywood is heated and pressed by a hot press or the like to cure the adhesive, the adhesive between the front surface and the back surface of the intermediate plate and each original plate is hardened. It takes a lot of time to cure the adhesive applied between the veneers constituting the plate, and there is a problem that the plywood manufacturing time as a whole becomes long.

Further, even if extra adhesive is applied between the single plates constituting the intermediate plate, a large amount of adhesive is required to form the intermediate plate although it does not affect the strength of the plywood. This also causes a problem of increasing the manufacturing cost of plywood.

The present invention was invented in order to solve the above-mentioned conventional drawbacks, and an object thereof is to show the defects of the intermediate plate on the surface of the plywood without lowering the production efficiency of the plywood. It is an object of the present invention to provide a veneer gluing method when manufacturing an even-numbered plywood that can be made difficult and can be improved in quality.

Another object of the present invention is to reduce the consumption of adhesive and to reduce the manufacturing cost as compared with the case of manufacturing an even numbered plywood by a conventional gluing method. It is intended to provide a veneer gluing method when manufacturing plywood.

[0010]

Therefore, according to the present invention, an adhesive is applied to a veneer to which other veneers are bonded on the front and back surfaces to manufacture a plywood having an even number of four or more sheets. At this time, in a veneer gluing method of applying an adhesive by a coating roll and a doctor roll respectively arranged on the front surface side and the back surface side of the veneer, at least two veneers adjacent to each other when a plywood is formed. When applying the adhesive, it is possible to change the interval of the doctor roll for each application roll appropriately so that the amount of adhesive applied between the veneers and the amount of adhesive applied on the front surface and the back surface are almost uniform. It has a feature.

[0011]

The method of the present invention will be described below.

First, an example of an apparatus embodying the method of the present invention will be described.

FIG. 1 is a schematic perspective view of a single-plate gluing device.

FIG. 2 is a schematic sectional view taken along the line II-II of FIG.

A body frame (not shown) of the veneer gluing device 1 is provided with a pair of upper and lower first and second coating rolls 3 and 5 whose axes are parallel to each other and whose outer diameters are equal to each other. 1
Only the bearing 7 of the coating roll 3 is shown, and the bearing of the second coating roll 5 is omitted), and each is rotated in the arrow direction by a motor (not shown).

Among them, the bearings 7 for rotatably supporting the shaft ends of the first coating roll 3 located above are movably in the vertical direction by vertical guides (not shown) provided in the main body frame. A first feed screw 13 that is supported and meshed with the body frame is connected to each of the bearings 7. Then, by rotating each first feed screw 13 manually or by an electric motor (not shown) synchronously in a desired direction, the first coating roll 3 moves vertically with respect to the second coating roll 5. To be done. Thereby, the mutual distance between the first coating roll 3 and the second coating roll 5 can be arbitrarily adjusted according to the plate thickness of the single plates 51 and 53 to be coated with the adhesive described later.

A first doctor roll 15 which is rotated in the direction of the arrow by a motor (not shown) on the carry-in side of the main body frame corresponding to the first coating roll 3 is the outermost peripheral portion of the first coating roll 3. It is possible to contact and separate from the outer peripheral surface of the first coating roll 3 which is a quarter of the circumference from the lower point position to the upstream side in the rotational direction (opposite to the rotational direction), and to rotate via the bearing 17. Supported as possible. That is, a first horizontal guide (not shown) is provided on the main body frame corresponding to the carry-in side of the first coating roll 3, and the shaft ends of the first doctor roll 15 are supported by the first horizontal guide. Bearing 17
Are movably supported in the horizontal direction.

A shaft end of a second feed screw 21 meshed with the body frame is connected to the bearing 17, and a numerically controllable first electric motor mounted on the body frame is connected to the second feed screw 21. A first nut gear 25 connected to the motor 23 is meshed. Then, by moving the first doctor roll 15 by the driving electric motor 23 and appropriately changing the interval with respect to the first coating roll 3, the adhesive supplied to the outer peripheral surface of the first coating roll 3 is removed. , So that the desired amount applied to the single plates 51 and 53 can be adjusted.

The body frame has a first adhesive supply member 2
7 is attached such that its supply end extends to a space 29 having a substantially V-shaped cross section in which the first coating roll 3 and the first doctor roll 15 are close to each other, and the first adhesive supply is provided. The adhesive 31 is supplied from the member 27 into the space 29.

A sliding contact plate (not shown) is slidably attached to the shaft end surfaces of the first coating roll 3 and the first doctor roll 15 so that the adhesive stored in the space 29 is retained. 31 is configured not to leak.

On the other hand, a second doctor roll 33 rotated by a motor (not shown) is provided on the carry-out side of the main body frame corresponding to the second coating roll 5.
Of the outermost point of the outer periphery of the second coating roll 5 from the uppermost position in the rotational direction to the outer peripheral surface of the second coating roll 5 at a distance of 3/4 of the outer peripheral length of the second coating roll 5, and the bearing 35 It is rotatably supported via. That is, a second horizontal guide (not shown) is provided on the main body frame corresponding to the unloading side of the second coating roll 5, and the shaft ends of the second doctor roll 33 are rotated on the second horizontal guide. A bearing 35 that supports the movement is supported so as to be movable in the horizontal direction.

A shaft end portion of a third feed screw 39 meshed with the body frame is connected to the bearing 35, and a second numerically controllable second lens attached to the body frame is attached to the third feed screw 39. A second nut gear 43 connected to the electric motor 41 is meshed. Then, the second doctor roll 33 is moved by the driving electric motor 41 to appropriately change the distance to the second coating roll 5, so that the adhesive supplied to the outer peripheral surface of the second coating roll 5 is removed. It is possible to adjust so that the desired amount applied to the plates 51 and 53 can be obtained.

A second adhesive supply member 4 is provided on the body frame.
4 is attached such that its supply end extends into a space 45 having a substantially V-shaped cross section where the second coating roll 5 and the second doctor roll 33 are close to each other, and the second adhesive supply member 44 is attached. The adhesive 46 is supplied into the space 45 from.
A sliding contact plate (not shown) is slidably attached to each shaft end surface of the second coating roll 5 and the second doctor roll 33, and is stored in the space 45 by the sliding contact plate. The adhesive 46 is configured so as not to leak out.

Next, when manufacturing even-numbered sheets (four sheets in this embodiment) of plywood by the single-plate gluing apparatus 1 configured as described above, two veneer surfaces constituting the middle plate are formed. A method of applying the adhesive to each of the layers will be described.

FIG. 3 is an exploded perspective view schematically showing an even-numbered plywood.

When the original plates 57 and 59 are laminated and adhered to the front surface and the back surface of the middle plate 55 composed of the two single plates 51 and 53, first, on one original plate 57, between the single plates 51 and 53. After laminating the middle plate 55 coated with the adhesive and having the front surface and the back surface coated with the adhesive, the two original plates 57, 59 not coated with the adhesive are laminated on the surface of the middle plate 55, Next, the mechanical work of the even-numbered plywood 61 is performed by repeating the work of stacking the two middle plates 55 on the original plate 59. At this time, in order to apply the adhesive to the middle plate 55, and hence to the respective single plates 51 and 53 constituting the middle plate 55, for example, the upper surface of the upper single plate 51 and the lower surface of the lower single plate 53 are applied. And it is necessary to make the amount of the adhesive applied between the single plate 51 and the single plate 53 substantially uniform.

The methods for achieving the above requirements are roughly classified into the following two types. [First Method] FIGS. 4 and 5 are explanatory views showing a first veneer gluing method. In addition, in FIGS. 4 to 12, in order to clarify the relationship between the amount of the adhesive applied to the veneer and the interval between the application roll and the doctor roll, the adhesive applied to the veneer is referred to as the interval. It is shown in the state of being matched.

First, one original plate 59 is placed on a deposition table (not shown). Therefore, the second electric motor 23 and the second electric motor 41 are respectively driven to rotate the second electric motor 41.
The respective bearings 17 and 25 by means of the lead screws 21 and 39 of
The original plates 57 and 59 are adhered to the front surface and the back surface of the intermediate plate 55 with the respective intervals of the first doctor roll 15 with respect to the first coating roll 3 and the second doctor roll 33 with respect to the second coating roll 5. The distance a is set in accordance with the amount of adhesive required to be applied.

In this state, when the single plate 51 constituting the lower part of the intermediate plate 55 is carried in between the first and second coating rolls 3 and 5, a gap is formed between the front surface and the back surface of the single plate 51. a
A predetermined amount of adhesive is applied according to the above.

After the single plate 51 passing between the first and second coating rolls 3 and 5 is placed on the original plate 59, the second electric motor 41 is driven to apply the bearing 35 to the second coating. It moves to the roll 5 side and the interval between the second coating roll 5 and the second doctor roll 33 is set and changed to zero. As a result, the adhesion of the adhesive to the outer peripheral surface of the second coating roll 5 is regulated as shown in FIG. At this time, the mutual spacing between the first coating roll 3 and the first doctor roll 15 is maintained at the spacing a.

In this state, when the veneer 53 is carried in between the first coating roll 3 and the second coating roll 5, the veneer 53 is brought in.
An amount of adhesive is applied to the upper surface of the first coating roll 3 and the first doctor roll 15 according to the mutual distance a, but the application of the adhesive is restricted to the lower surface of the single plate 53. ..

This veneer 53 is placed on the veneer 51, then two veneers are newly placed on the original plate 57 with the original plate 59 stacked thereon, and thereafter, the veneer 51, the veneer 53, and the like. Two stacked veneers are sequentially deposited. When the adhesive is applied and superposed in this manner, the amount of the adhesive between the surfaces of one set of veneer groups to be plywood can be made substantially uniform.

Thus, the first veneer gluing method is the second
Second doctor roll 33 on the outer periphery of the coating roll 5 of
By changing the distance to be a or zero to regulate the application of a predetermined amount of adhesive on the front surface and the back surface of one veneer 51, and the adhesive on the back surface of the other veneer 53. However, a certain amount of adhesive was applied to the surface, but when bonding the veneers 51 and 53 in which the fiber directions are the same direction, less adhesive is used than when bonding veneers in which the fiber directions are orthogonal to each other. The following modifications may be made focusing on the fact that the same adhesive strength can be ensured.

As shown in FIG. 6, the first electric motor 23
So that the distance between the first doctor roll 15 and the outer peripheral surface of the first coating roll 3 becomes c (a> c).
Further, the second electric motor 41 is driven so that the distance between the second doctor roll 33 and the outer peripheral surface of the second coating roll 5 becomes a.
Are set so that

When the single plate 51 is carried between the first coating roll 3 and the second coating roll 5 in the above state, the first coating roll 3 and the first coating roll 3 are placed on the upper surface of the single plate 51. The adhesive is applied in an amount corresponding to the distance c from the doctor roll 15 and the second coating roll 5 and the second doctor roll 33 are provided on the lower surface.
The adhesives are applied in an amount corresponding to the distance a between them.

The first and second coating rolls 3.5
In the same direction as described above, the single plate 51 passing through the space is stacked on the original plate 59, and then the first electric motor 23 is driven to separate the bearing 17 from the first coating roll 3 as shown in FIG. To the first coating roll 3 and the first doctor roll 1
5, the second electric motor 41 is driven to move the bearing 35 to the second coating roll 3 side, and the distance between the second coating roll 5 and the second doctor roll 33 is zero. Change the settings so that

When the single plate 53 is carried in between the first coating roll 3 and the second coating roll 5, the first coating roll 3 and the first doctor roll are provided on the upper surface of the single plate 53. 1
The adhesive is applied in an amount corresponding to the mutual distance a with respect to 5, and the application of the adhesive to the lower surface is regulated.

Due to the above action, a smaller amount of adhesive is applied to the surface where the single plate 51 and the single plate 53 overlap with each other than the other surface.

Alternatively, the following may be carried out. That is, only the coating on the single plates 51 and 53 will be described. However, as shown in FIG. 8, the first electric motor 23 is driven so that the distance between the first doctor roll 15 and the outer peripheral surface of the first coating roll 3 becomes smaller. The distance is set to zero and the distance between the second doctor roll 33 and the outer peripheral surface of the second coating roll 5 is set to a by driving the second electric motor 41.

When the single plate 51 is carried in between the first coating roll 3 and the second coating roll 5 in the above state, the application of the adhesive is regulated on the upper surface of the single plate 51. The lower surface is coated with an adhesive in an amount corresponding to the distance a between the second coating roll 5 and the second doctor roll 33. After coating, as shown in FIG. 9, the first electric motor 23 is driven to move the bearing 17 in a direction away from the first coating roll 3 to move the first coating roll 3 and the first doctor roll 15 to each other.
To a, and the second electric motor 41 is driven to move the bearing 35 to the second coating roll 3 side so that the distance between the second coating roll 5 and the second doctor roll 33 is c. Change the settings so that

In this state, when the single plate 53 is carried in between the first coating roll 3 and the second coating roll 5, the first coating roll 3 and the first coating roll 3 are provided on the upper surface of the single plate 53. The adhesive is applied in an amount corresponding to the mutual distance a from the doctor roll 15 and the adhesive is applied to the lower surface in an amount corresponding to the interval c between the second applying roll 5 and the second doctor roll 33. To be done.

As a result of the above-described operation, as in the case shown in FIGS. 6 and 7, a smaller amount of adhesive is applied to the surface where the single plate 51 and the single plate 53 overlap with each other than the other surfaces. [Second Method] FIGS. 10 and 11 are explanatory views showing a second method for gluing a single plate.

This method also shows that the adhesive is applied to the single plates 51 and 53, and the overlapping of the original plates 57 and 59 is omitted.

First, as shown in FIG. 10, by driving the second electric motor 41 to move the bearing 35, the second electric motor 41 is moved.
The coating roller 5 and the second doctor roll 33 are spaced from each other by a distance a corresponding to the amount of adhesive to be coated on the front surface and the back surface of the intermediate plate 55, and the first electric motor 23 is driven to produce a bearing. By moving 17 the first coating roll 3
The mutual distance between the first doctor roll 15 and the first doctor roll 15 is set to a distance b (a> b) narrower than the distance between the second coating roll 5 and the second doctor roll 33 described above.

When the veneer 51 is loaded in the above-mentioned state, an amount of adhesive corresponding to the distance a is applied to the lower surface of the veneer 51, and the distance b is applied to the upper surface of the veneer 51. An amount of adhesive less than that applied to each is applied.

Next, the first driven as shown in FIG.
Of the bearing 17 by the electric motor 23 of the first coating roll 3
By moving the first coating roll 3 and the first doctor roll 15 at a distance a corresponding to the amount of adhesive to be coated on the surface of the intermediate plate 55. The bearing 35 is moved to the side of the second coating roll 5 by the second electric motor 41 that is operated so as to move the second coating roll 5 and the bearing 3.
The mutual distance with 5 is changed to the distance b ′ for adjustment.

This distance b'is the amount of the adhesive corresponding to the distance a applied to the lower surface of the single plate 51 or the upper surface of the single plate 53 to the amount of the adhesive corresponding to the distance b applied to the upper surface of the single plate 51. The amount is appropriately set so that the amount is subtracted.

When the veneer 53 is carried in, the veneer 53 is
An amount of adhesive corresponding to the distance a is applied to the upper surface of the, and an amount of adhesive corresponding to the distance b ′ is applied to the lower surface thereof.

When the veneer 53 is laminated on the veneer 51 coated with the adhesive as described above, the amount of the adhesive between the respective surfaces of one veneer group to be a plywood is substantially uniform. can do.

In the above embodiment, in order to improve the productivity, the first and second coating rolls 3 and 5 are kept in contact with the end of the single plate 51 in the transfer direction and the end of the single plate 53 in the transfer direction. It is necessary to insert it between the two. In this case, the following may be done.

That is, the coating is set on the single plate 51, and after the leading edge of the single plate 51 in the transport direction reaches between the first and second coating rolls 3 and 5, the first coating roll 3 is applied.
Immediately after rotating {L- (πD) / 4} / πD
The doctor roll 15 is moved to a predetermined position by driving the first electric motor 23 (however, it is not moved in the case of the embodiment shown in FIGS. 4 and 5), while the second coating roll 5 is If the second doctor roll 33 is moved to a predetermined position by the driving of the second electric motor 41 immediately after the rotation of L- (3πD) / 4} / πD, the single plates 51 and 53 are inserted in the above state. Even then, a predetermined amount of adhesive is applied to each.

After the single plate 53 is carried in, there is a step of superposing the two original plates on the single plate 53 as described above. Therefore, during the step, the first and second doctor rolls 15 and 3
3 may be moved to a position for applying the above-mentioned single plate 51.

The position of the second doctor roll 33 with respect to the second coating roll 5 in the above-described first and second veneer gluing methods may be configured as shown in FIG.

That is, the adhesive receiving tray 71, in which the adhesive 46 is stored, is arranged below the second coating roll 5 so that the lower end portion of the second coating roll 5 can be retracted. The adhesive can be supplied to the surface and the second
The second doctor roll 33 is moved toward and away from the outermost position of the outer periphery of the second coating roll 5 on the carrying-in side of the coating roll 5 at a position spaced 1 / 4πD away from the uppermost position of the outer periphery in the direction opposite to the rotation direction. Arrange as much as possible.

In this veneer gluing device 73, the first and second coating rolls 3 and the like in the same manner as described above, with the terminal end of the veneer 51 in the carrying direction and the leading end of the veneer 53 in the carrying direction are in contact with each other.
When inserting between 5, the following may be done.

That is, the coating is set on the single plate 51, and after the leading end of the single plate 51 in the transport direction reaches between the first and second coating rolls 3 and 5, the first coating roll 3 is applied.
Immediately after rotating {L- (πD) / 4} / πD
If the doctor roll 15 is moved to a predetermined position (however, it is not moved if it corresponds to the embodiment shown in FIGS. 4 and 5), even if the veneers 51 and 53 are inserted in the above-mentioned state, A quantity of adhesive is applied each.

In the above description, with respect to the first coating roll 3, the first doctor roll 15 and the second doctor roll 15 are placed at a position 1/4 πD away from the lowest point of the outer circumference in the direction opposite to the rotation direction. The second doctor roll 33 is movably arranged at a position 3 / 4πD or 1 / 4πD away from the uppermost position of the outer periphery of the coating roll 5 in the direction opposite to the rotation direction. The arrangement positions of the first and second doctor rolls 15 and 33 are the same as the loading timing of the single plates 51 and 53 and the first and second doctor rolls 15 and 33.
The timing of moving 33 is determined, and if the adhesive supplied to the outer peripheral surfaces of the first and second coating rolls 3 and 5 can be regulated to a desired amount, The arrangement positions of the first and second doctor rolls 15 and 33 are not particularly limited.

[0058]

Therefore, according to the present invention, it is possible to manufacture an even-numbered plywood which can improve the quality without lowering the manufacturing efficiency of the plywood and making the defects of the middle plate less likely to appear on the surface of the plywood. A veneer gluing method can be provided.

Further, according to the present invention, the even-numbered plywood which can reduce the manufacturing cost by reducing the consumption of the adhesive as compared with the case where the even-numbered plywood is manufactured by the conventional gluing method is manufactured. It is possible to provide a veneer gluing method.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a single-plate gluing device.

FIG. 2 is a schematic sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view schematically showing an even-numbered plywood.

FIG. 4 is an explanatory diagram showing a first veneer gluing method.

FIG. 5 is an explanatory diagram showing a first veneer gluing method.

FIG. 6 is an explanatory diagram showing a modified example of the first veneer gluing method.

FIG. 7 is an explanatory diagram showing a modified example of the first veneer gluing method.

FIG. 8 is an explanatory diagram showing a modified example of the first veneer gluing method.

FIG. 9 is an explanatory diagram showing a modified example of the first veneer gluing method.

FIG. 10 is an explanatory diagram showing a second veneer gluing method.

FIG. 11 is an explanatory diagram showing a second veneer gluing method.

FIG. 12 is an explanatory diagram showing a modification common to the first and first veneer pasting methods.

[Explanation of symbols]

 1 Single Plate Gluing Device 3 First Coating Roll 5 Second Coating Roll 15 First Doctor Roll 33 Second Doctor Roll 51 Second Plate 51 Single Plate 53 Single Plate 55 Middle Plate 57.59 Original Plate 61 Even-Ply Plywood

Claims (1)

[Claims] 1. A veneer veneer to which other veneer veneers are adhered on the front and back surfaces, is coated with an adhesive to produce a plywood having an even number of at least 4 sheets, and the front side of the veneer veneer is manufactured. And a veneer veneer gluing method of applying an adhesive by means of a coating roll and a doctor roll respectively arranged on the back side, when applying the adhesive to at least two veneer veneers adjacent to each other when a plywood is formed. The veneer unit is characterized in that the doctor roll intervals for the respective coating rolls can be changed as appropriate to make the coating amount of the adhesive between the veneer veneers and the coating amount of the adhesive on the front surface and the back surface substantially uniform. Board gluing method.