JPH0374162B2 - - Google Patents

Description

Detailed Description of the Invention The present invention applies pressure to the surface of a veneer veneer with a thermoplastic or thermosetting adhesive or an adhesive thread attached or impregnated with a thermoplastic or thermosetting adhesive. This relates to improvements to the pressure roll used in veneer veneer joining equipment that joins boards.The purpose is to shorten the curing time of the adhesive by increasing the pressurizing area, thereby ensuring reliable joining. In addition, the objective is to prevent the blocking phenomenon (the surfaces of the stacked veneer veneers sticking together due to undried adhesive) in the subsequent process.

Traditionally, veneer veneer (hereinafter referred to as veneer)
A bonding device that performs bonding by dropping thermoplastic or thermosetting adhesive (hereinafter referred to as adhesive) onto the joint and applying pressure with a cooling or heating roll (hereinafter referred to as pressure roll). , or a method in which bonding is performed by cooling and applying pressure to the surfaces of veneers that are sequentially fed by a pressure roll (hereinafter referred to as adhesive thread) attached or impregnated with the adhesive (Japanese Patent Application Laid-open No.
58-177301), and a combination of both (see Japanese Patent Publication No. 57-52201).

However, most of the pressure rolls used in these conventional bonding devices are metal rolls, although there are differences in cooling or heating means, so the pressure rolls that press the adhesive or adhesive thread onto the surface of the veneer are contactless. Small area (nearly close to line contact), sufficient pressing force,
Not enough cooling or heating time was provided. In particular, depending on the unevenness of the surface of the veneer, some parts may not be pressurized, which further reduces the bonding strength.

The present invention has been improved to eliminate the various drawbacks of the conventional pressure rolls, and aims to increase the area of contact with the surface of the veneer to apply sufficient pressure. That is, the pressure roll according to the present invention has an elastic body such as an elastic rubber such as natural rubber or synthetic rubber or a spring body interposed on the circumferential surface of the outer ring of the bearing or the metal roll fitted to the outer periphery of the outer ring of the bearing. A plurality of blocks are arranged closely or intermittently,
The deformation of the elastic body allows the blocks to come into surface contact.

An example of the implementation of the present invention will be described below based on the drawings.

In FIG. 1, a thread 2 is passed through a thermoplastic adhesive bath 3 in a molten state, and the thread 2 is passed through a cooling roll cooled by cooling water dripping from a nozzle 4 to form a veneer P. This figure shows a very common bonding apparatus A that sequentially applies pressure to surfaces, and numeral 1 in the figure is a cooling roll as a pressure roll according to the present invention. The cooling roll 1 is constructed by fitting a metal roll 14 made of steel or stainless steel onto the outer periphery of an outer ring 13a of a bearing 13.
A rubber ring 11 as an elastic body is fitted or baked on the circumferential surface of the rubber ring 4, and a copper block 12 as a block is disposed closely in the circumferential direction on the outer circumferential surface of the rubber ring 11. The copper block has a rectangular parallelepiped shape with a length (circumferential length) of 3 mm, a width (axial length) of 10 mm, and a thickness of about 5 mm, and is coated with an adhesive such as chloroprene adhesive on the surface of a rubber ring with a diameter of 47 mm. Or it is attached with double-sided tape. The width of the cooling roll 1 only needs to be wide enough to press the adhesive thread, so it is sufficient to have a width of about 10 to 12 mm at most, but it may be wider, and a width of 10 to 12 mm is sufficient. They are disposed on the surface of the plate at least in two places at both ends, and in some cases one to several places in the center. In the figure, reference numeral 15 denotes a support shaft, and one long support shaft is provided for each cooling roll or when connecting cooling rolls. The pressurizing surface of the block 12 may be a flat or curved surface, and each block 1
Even if the two are in close contact with each other in a non-pressurized state, there may be a gap 16 between them. (Second
(See figure) The material for the block 12 is most preferably copper, which has good thermal conductivity, but metals such as aluminum and iron, and even ceramics may also be used. Furthermore, the rubber ring 11 may have grooves 11a formed in the radial direction as in the cooling roll 1 shown in FIG. However, it is pushed out in the vicinity of the pressurized part, which has the advantage of increasing the cooling effect. Also, like the joining device,
By introducing the adhesive thread 2 into the cooling roll 1 from an obliquely upward direction so as to avoid contact with the cooling roll 1 as much as possible, it is possible to prevent the adhesive from starting to harden before it comes into contact with the veneer.

As a cooling means for the cooling roll 1, in the bonding apparatus shown in Figs. 1 and 3, a method was used in which cooling water was dripped from the nozzle 4, but a cooling body through which cooling water circulates inside was used so as to be in contact with the block. Alternatively, cold air may be blown onto the outer periphery of the block. Furthermore, the structure of the bonding device itself is not limited to that shown in FIGS.
The structures of the bonding devices described in Japanese Patent Publication No. 177301 and Japanese Patent Publication No. 57-52201 can be adopted, and the pressure roll according to the present invention may be applied as the pressure roll constituting these bonding devices.

FIG. 4 shows that the block 12 is connected to a rubber ring 11.
This figure shows the cooling roll 1 intermittently embedded in the circumferential surface of the cooling roll 1. By embedding the blocks 12 in this way, the risk of them coming off from the rubber ring 11 is reduced. Further, as shown in the figure, although a slight gap does not pose much of a problem in terms of pressurizing force, it is better to have a narrow gap.

5a-c show another embodiment of the chill roll in which the block 12 is attached to the rubber ring 11 without adhesive or double-sided tape. That is, a large number of blocks 12 having grooves 17 formed at both ends are arranged on the circumferential surface of a rubber ring 11 with the grooves 17 outside, and a retaining ring 18 such as a rubber band or a spring ring is fitted into the groove 17. Therefore, the block is tightened and fixed to the circumferential surface of the rubber ring 11. Of course, this type of cooling roll 1 can also be bonded with an adhesive.

The block 12 may have an oblique shape and be disposed obliquely with respect to the support shaft 15 (see Figure 5 d), or a central groove 17a may be provided in the center of the block (see Figures 5 e and f). ), if the circumferential surface of the cooling roll has vertical grooves in the circumferential direction, the convex shape created by the adhesive being pressed will be formed continuously in the direction perpendicular to the fibers of the veneer, and it will not be stiff. It is also effective in reinforcing the veneer. Furthermore, as shown in FIG.
2 may be provided with insertion holes in the circumferential direction, and the retaining ring 18 may be inserted into these insertion holes. In addition, the fifth
Reference numerals 12a in FIGS. c and f indicate engagement protrusions that engage with both end surfaces of the rubber ring 11.

Next, FIG. 7 shows the rubber ring 11 of the block 12.
The block 1 is attached to a sheet 19 having the same width as the rubber ring 11.
2 is attached to the front, and the sheet 19 is wrapped and adhered to the circumferential surface of the rubber ring 11.
It is effective to use a thin metal sheet 19 in which grooves 19a have been cut in advance, since the trouble of gluing the blocks 12 as described above can be saved.
(See FIG. 8) FIG. 9 shows an embodiment of a pressure roll that employs a leaf spring as the elastic body attached to the outer periphery of the metal roll 14. A leaf spring with an L-shaped cross section as shown in FIG. The block 12 is attached to the tip of the roll 20, and the base end is screwed to the circumferential surface of the metal roll 14. Even if the leaf spring 20 is used as the elastic body in this way, it is possible to achieve the same pressing effect as the rubber ring, and it is also possible to use clothing or other spring bodies in place of the leaf spring 20. It is.

I have mainly explained the cooling roll above, but
When a thermosetting adhesive or adhesive thread is used, a heating roll must be used, and in that case, the design will be changed as necessary. Also, there are cases where the elastic body is directly attached to the outer ring of the bearing without intervening the metal roll 14, and it should be confirmed that in either case, it is within the technical scope of the present invention.

As is clear from the above description, the pressure roll of the present invention includes a plurality of blocks arranged with elastic bodies interposed on the outer ring of the bearing or the circumferential surface of the metal roll fitted to the outer periphery of the bearing. Therefore, the part of the block that comes into contact with the surface of the veneer comes into surface contact with the surface of the veneer by deforming the elastic body on the back surface of the block, and the adhesive is applied to the surface of the veneer, for example, as shown in FIG. It is pasted on the board. Therefore, the contact area and contact time are increased, sufficient cooling or heating is achieved, and the material is easily adapted to the surface of the veneer, allowing even pressure to be applied. Therefore, it is possible to effectively prevent the blocking phenomenon in the subsequent process, and to improve the smoothness of the plywood manufacturing process, as well as to improve the quality and economic value of the bonded veneer. .

Finally, an application example of the pressure roll according to the present invention will be illustrated.

FIG. 12 shows an adhesive thread attaching device B having a structure similar to that of the veneer bonding device described above, using a conventionally known veneer lace (for example, Utility Model Application No. 52-46395, Japanese Patent Application Laid-open No. 53-1998).
It is provided on the upper side of the cutting blade 31 in the Japanese Patent Publication No. 91499), and is used to produce a veneer P by cutting a raw wood 32 with adhesive threads attached to the outer periphery. By attaching adhesive thread to the outer periphery of the log 32 before cutting in this way, the veneer P after cutting is
They are connected in a continuous manner to prevent the veneers from separating due to cracks, etc., and to provide reinforcement in the direction perpendicular to the fiber direction of the veneers. Of course, if the pressure roll of the present invention is used in such a joining device B, the raw wood 32
Adhesion efficiency can be improved because pressure can be applied while adapting to the unevenness of the logs.However, to further improve adhesion efficiency, it is recommended to heat and dry the joining area of the raw wood 32 before attaching the adhesive thread. good.

Next, FIG. 13 shows a veneer joining apparatus that employs a pressure belt as a pressure means, but the technical concept of the present invention can also be applied to such a type of joining apparatus. That is, a large number of blocks 12 are closely arranged on the outer peripheral surface of a sponge belt 34 as an elastic body wrapped around two pressure pulleys 33, and on the inside of the sponge belt 34 between both pulleys 33. The sponge belt 34 is equipped with a pressure means such as a pressure bar 35 having a roller pivotally attached to its tip to press the sponge belt 34 against the veneer P, and the adhesive threads are sequentially pressed and adhered to the surface of the veneer P. It is. Even in this type of bonding device, since the blocks 12 are arranged on the outer peripheral surface of the belt 34, the contact area of the blocks 12 increases due to the deformation of the elastic belt 34, and an improvement in the adhesion effect can be expected. It is. In addition, 36 in the figure is a block 12 disposed on the outer peripheral surface of the belt 34 in contact with the block 12.
This figure shows a cooling body that cools the engine, with cooling water circulating inside. Also, the sponge belt 34
Alternatively, a toothed belt with blocks arranged thereon may be used, and the toothed belt may be wound around an elastic roll, or a gear may be interposed between the elastic rolls, and a chain arranged with blocks may be wound around the gear. You can hang it.

[Brief explanation of drawings]

1 and 3 are explanatory diagrams showing a veneer joining apparatus equipped with a cooling roll according to the present invention; FIG. 2;
4, 6 and 9 are front views showing other embodiments of the cooling roll, FIGS. 5a and 5d are side views showing still another cooling roll, and FIG. 5b is a sectional view taken along the line X-X in Figure 5a, and Figure 5c is a cross-sectional view taken along the line X-X in Figure 5a.
FIG. 5e is a plan view showing another embodiment of the block, FIG. 5f is a side view of the same, and FIGS. 7 and 8 show the block formed in a band shape. Figure 10 is a perspective view showing the block attached to the tip of the leaf spring, Figure 11 is a plan view showing the adhesive applied to the veneer, and Figure 12 is the same as Figure 1. An explanatory diagram showing a state in which an adhesive thread attachment device having the same structure as the bonding device shown in Fig. 13 is attached to a veneer lace, and Fig. 13 shows a veneer bonding device using a pressure belt as a pressure means. It is an explanatory diagram. A... Veneer joining device, B... Adhesive thread attachment device, P... Veneer, 1... Cooling roll, 2... Thread,
3... Adhesive tank, 4... Nozzle, 11... Rubber ring, 11a... Cut groove, 12... Block, 12
a... Engaging protrusion, 13... Bearing, 13a... Bearing outer ring, 14... Metal roll, 15... Support shaft,
16...Gap, 17...Groove, 17a...Central groove, 18...Retaining ring, 19...Metal sheet, 19
a... Groove, 20... Leaf spring, 31... Cutler, 32
... Log, 33 ... Pressure pulley, 34 ... Sponge belt, 35 ... Pressure bar, 36 ... Cooling body.

Claims (1)

[Scope of Claims] 1. A pressure roll in a veneer veneer bonding device that presses an adhesive and/or an adhesive thread attached or impregnated with the adhesive onto the surface of a veneer veneer, which pressurizes the outer ring of a bearing or A pressure roll comprising a plurality of blocks arranged with elastic bodies interposed on the circumferential surface of a metal roll fitted to the outer periphery of a bearing outer ring. 2. The pressure roll according to claim 1, wherein the elastic body is a rubber ring provided on the outer ring of a bearing or on the circumferential surface of a metal roll fitted to the outer periphery of the outer ring of the bearing. 3. The pressure roll according to claim 2, wherein the block is adhered to the circumferential surface of the rubber ring with an adhesive. 4. The pressure roll according to claim 2, wherein the block is embedded in the circumferential surface of the rubber ring. 5. The pressure roll according to claim 2, wherein the block is attached to the circumferential surface of the rubber ring with a retaining ring. 6. The pressure roll according to claim 1, wherein the elastic body is a spring body disposed on the outer ring of a bearing or on the circumferential surface of a metal roll fitted to the outer periphery of the outer ring of the bearing. 7. The pressure roll according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein the block is a metal block. 8. Claim 1, 2 or 3 in which the metal block is a copper block.
The pressure roll according to item 1 or 4 or 5 or 6. 9. The pressure roll according to claim 1 or 2 or 3 or 4 or 5 or 6, wherein the block is a ceramic block.