JPS60234801A - Method of pasting adhesive attached thread to veneer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a method for attaching adhesive-coated foil thread to a veneer veneer (hereinafter referred to as a veneer), and more particularly, a method for bonding veneer veneers with each other by cross-cutting or bonding the veneers together. The present invention relates to a method for attaching adhesive-coated foil thread to a veneer veneer, which is used when vertically joining or reinforcing a veneer.

(b) Prior art Conventionally, cotton thread, Tetoron thread, or preferably untwisted threads of these threads, are bonded to the veneer when horizontally or warply or when reinforcing the veneer in the direction perpendicular to the fibers. It was attached by an agent. When attaching the yarn to the veneer, the yarn is impregnated with the adhesive by passing through an adhesive tank containing a thermoplastic resin adhesive or thermosetting resin adhesive, and then the yarn is impregnated with the adhesive. The adhesive thread is attached to the veneer while curing the adhesive using a pressure body such as a cooling roll for thermoplastic resin adhesives or a heating roll for thermosetting resin adhesives. Ta.

(c) Problems to be solved by the invention However, for example, when using a thermoplastic resin adhesive, an appropriate tension is applied to the threads attached to the veneer.
As shown in FIG. 7, the thread 41 of the adhesive-attached thread 44 fed out from the adhesive tank 40 is positioned on the cooling roll 42 (II) of the adhesive 43, and the adhesive 43 attached around the thread 41 is cooled. After being cured by contact with roll 42,
Since the threads 41 were stuck to the veneer S due to the pressure applied by the cooling roll 42, the threads 41 could not be spread out into a flat shape.

As a result, as shown in FIG. 8, the thread 41 becomes curled with respect to the veneer S, so that the thread 41 is attached to the veneer S with a relatively small area, so that it has sufficient lateral width. It was not possible to obtain joint strength, vertical joint strength, or reinforcing strength.

In addition, in this state, when the original board is assembled on the veneer S soil to which the threads 41 are attached, streak-like defects are likely to appear on the plywood surface due to the effect of the build-up caused by the threads 41 and adhesive 43, and the plywood The quality was getting worse.

(d) Means to solve the problem The object of the present invention is to solve the above-mentioned drawbacks of the conventional art.

By attaching threads and adhesive to a veneer by a simple method while keeping them in a flat state, sufficient adhesive strength can be obtained, and the quality of plywood using the veneer to which the threads are attached can be improved. An object of the present invention is to provide a method for attaching neck threads with adhesive.

For this reason, the present invention provides an attachment method in which the yarn is impregnated with an adhesive by passing through an adhesive tank, and then the yarn is attached to the veneer while being cured by a pressurizing body. In this method, the adhesive-attached yarn fed from the adhesive tank to the pressurizing body is attached to the veneer by jumping from the pressurizing body and positioning the yarn on the periphery of the adhesive. It constitutes a method for attaching an adhesive-attached neck thread to

(c) Effect of the Invention According to the present invention, the adhesive around the yarn is removed from the pressurizing body in the adhesive-attached yarn fed out from the adhesive tank, and the yarn is positioned around the adhesive. is cured when it is attached to the veneer. By deforming the yarn and adhesive into a flat shape using a pressurizing body, it is possible to widen the area of attachment of the yarn to the veneer and obtain high adhesive strength.

In addition, when attaching threads to a veneer, since the adhesive around the threads is in an uncured state, the threads are easily crushed into a flat shape by the pressure of the pressurizing body, and the threads and adhesive are bonded together. The height of the build-up of the agent can be lowered, and the quality of the plywood can be improved.

(f) Effects of the Invention As a result, the present invention is capable of attaching yarn to a veneer using a simple method with adhesive in a flat state, obtaining sufficient adhesive strength, and removing the veneer to which the yarn is attached. This is a method of adhering neck threads with adhesive to veneers that can improve the quality of the plywood used.

(g) Example Hereinafter, the present invention will be explained using an example in which the present invention is embodied in a veneer joining apparatus for joining narrow veneers together.

In Fig. 1, which shows an outline of the veneer joining device, and Fig. 2, which shows the delivery path of the joining thread, an outgoing conveyor 2 is connected to an incoming conveyor 1 that conveys narrow veneer S in a direction perpendicular to the fibers thereof. A veneer detector 3 is placed at the lower end of the carry-in conveyor 1 in the conveyance direction at an appropriate interval in the conveyance direction I\.

This veneer detector 3 changes from the veneer non-detection state to the W-plate detection state when the front end of the veneer S in the transport direction is located, and detects the veneer when the rear end of the veneer S in the transport direction has passed. transition from the state to the veneer non-detection state. The carry-out conveyor 2 is intermittently driven to carry the veneer based on the veneer detection signal output from the veneer detector 3. As a result, the veneers S carried in by the carry-in conveyor 1 at appropriate intervals are transferred to the carry-out conveyor 2 with their ends in the direction perpendicular to the fibers continuous with each other.

A plurality of cooling rolls 5 are arranged on the pulley 4 of the conveyance direction bank of the carry-out conveyor 2 at appropriate intervals in the direction perpendicular to the conveyance direction. The cooling roll 5 is cooled at least on its outer peripheral side by a refrigerant (for example, cooling water) flowing inside, and pressurizes and hardens the thermoplastic adhesive 7 attached to the joining thread 9, which will be described later, into a flat shape.

Above each cooling roll 5 is a thermoplastic adhesive melting tank 6.
are placed respectively. This thermoplastic adhesive melting tank 6 melts the chip-shaped thermoplastic adhesive 7 introduced therein using a built-in heater or a hot basin such as steam. A splicing yarn reel (not shown) is arranged above each thermoplastic adhesive dissolving tank 6, and a splicing yarn 9, preferably untwisted, made of genuine cotton yarn, Tetoron yarn, etc., is wound on the splicing yarn reel. It's being passed around. And this joining thread 9 is the second
As shown in the figure, after the thermoplastic adhesive 7 adheres by passing through the thermoplastic adhesive dissolving tank 6,
The adhesive adhering thread 8 is attached to the cooling roll 5 via a.
It is extended to l. The feeding hole 6a has a slightly larger diameter than the outer diameter of the splicing thread 9, and supports the splicing thread 9 being fed out at the left end in the figure. As a result, the adhesive-attached thread 8 is supported in a slightly inclined state relative to the cooling roll 5. So' I-Ck*tJ3JL 6 aka, 6□Yuwa6
□ In 8 and 3, the bonding thread 9 is located away from the cooling roll 5 and on the peripheral side of the thermoplastic adhesive 7.

Next, the method of this embodiment will be explained with reference to FIGS. 3 and 4, which show the state of adhesion of the bonding thread to the veneer.

The veneers S carried in by the carry-in conveyor 1 are placed on Pp in a continuous manner with the intermittent drive of the carry-out conveyor 2, and the bonding thread 9 is attached to the soil surface of the veneer S by the thermoplastic adhesive 7. It is pasted. After passing through the thermoplastic adhesive tank 6 and being impregnated with the thermoplastic adhesive 7, the joining thread 9 is located at the left end of the drawing hole 6a in the drawing, with the thermoplastic adhesive 7 drained off. Since it is fed out to the cooling roll 5, the bonding yarn 9 in the adhesive bonded yarn 8 is separated from the cooling roll 5 and is located on the periphery side of the thermoplastic adhesive 7 as it is fed out. The thermoplastic adhesive 7 on the cooling roll 5 side that has adhered to the joining yarn 9 in the above state is removed from the cooling roll 5.
The thermoplastic adhesive 7 around the bonding threads 9 is first cured by contact with the veneer S, and the thermoplastic adhesive 7 around the bonding threads 9 is finally cured due to the pressure applied to the veneer S by the cooling roll 5. It is pasted. At this time, since the thermoplastic adhesive 7 around the joining thread 9 is finally cured, the joining/1% 9 and the thermoplastic adhesive 7 attached thereto are compressed by the cooling roll 5 against the veneer S. As shown in FIG. 4, the veneer S is pasted onto the veneer S while being deformed into a flat shape.

Therefore, in the method of this embodiment, the bonding yarn 9 is transferred to the cooling roll 5 in the adhesive bonded yarn 8 fed out from the thermoplastic adhesive tank 6.
In order to harden the thermoplastic adhesive 7 around the bonding thread 9 to an n-end bend as pressure is applied between the veneer S and the cooling roll 5, While deforming the joining thread 9 and the surrounding thermoplastic resin adhesive 7 into a flat shape, the joining thread 9 is attached to the veneer S with high adhesive force.
It can be pasted to. In addition, since the joining thread 9 is adhered in a flat shape by the pressure horn of the cooling roll 5, this reduces the height of the rise of the joining thread 9 and the thermoplastic adhesive 7, and prevents deterioration of the plywood quality. obtain.

Note that the present invention can be modified and implemented as follows.

(1) In this example, a thermoplastic adhesive is used as the adhesive, and a cooling roll is used as the pressurizing body.The cooling roll is used to harden the thermoplastic adhesive while adhering the bonding thread to the surface of the veneer. In this method, a thermosetting adhesive is used as the adhesive, a heating roll is used as a pressurizing body, and the thermosetting adhesive is attached to the heating roll side of the yarn fed out from the adhesive tank. It is also possible to carry out a method in which the thermosetting adhesive on the heating roll side is cured earlier than the thermosetting adhesive on the veneer side, and then the thread is attached to the veneer surface.

(2) In this example, a method was used in which the joining thread was attached when joining the veneers together in a horizontal direction, but the present invention is a method in which the thread is attached when joining the ends of the veneers in the fiber direction in a longitudinal direction. Even a method can be implemented.

(3) The present invention can also be implemented as an attachment method for reinforcing at least the end side of a one-piece veneer with thread as the MA side in the fiber direction.

α) In this embodiment, after adhering the thermoplastic adhesive 7 to the bonding yarn 9 by passing it through the thermoplastic adhesive tank 6, the bonding yarn 9 is flown from the cooling roll 5 after the adhesive-attached yarn is passed through the thermoplastic adhesive tank 6.
The method of pasting the thermoplastic adhesive 7 while positioning it in the vicinity of the thermoplastic adhesive 7 was adopted, but in the present invention, the thread 2 is attached in advance as shown in FIG.
0 from the pressurizing body 21 and the hot melt yarn 23 which is located on the peripheral side of the adhesive 22 is fed out to the veneer S, and the adhesive 22 on the veneer S side of the hot melt yarn 23 is passed through the nozzle. After being melted by heated air discharged from 24, the thread 20 and adhesive 22 are pressed against the veneer S by the pressurizing body 21 to form a flat shape 1. It is also possible to apply a method in which the thread 20 is attached to the veneer S by curing the adhesive 22 while deforming it. That is, a hot melt yarn 23 is used in which the thread 20 is separated from the pressure body 21 and located on the peripheral side of the adhesive 22, and the adhesive 22 is substantially closer to the veneer S than the pressure body 21 side. Any method of attaching the thread 20 to the veneer S in a molten state falls within the technical scope of the present invention.

(5) As shown in FIG.
After adhering the adhesive 32 to the thread 31 by passing through the thread 31, the adhesive adhering thread 33 is passed through a pressurizing heating element 34 and a liquid cutter member 35 disposed close to the cooling roll 35, thereby causing the adhesive to adhere to the thread 31. While the thread 31 is positioned around the adhesive 32 and away from the cooling roll 36, the thread 31 is cured by the pressure of the cooling roll 36, and the thread 31 and the adhesive 32 are cured. It is also possible to implement a method of attaching the thread 31 to the veneer S while deforming it into a flat shape. In this case, even when the drive of the unloading conveyor 36 is stopped intermittently due to the loading of the veneers S with appropriate intervals, the adhesive 32 attached to the thread 31 can be maintained in a molten state by the heating element 34. together with the liquid draining member 3
5, the yarn 31 is separated from the cooling roll 36 in the adhesive-attached yarn 33, and the adhesive-attached yarn 33 can be fed out to the cooling roll 36 while being located around the adhesive 32. The thread 31 is attached to the veneer S while the adhesive 32 around the veneer 31 is finally hardened and deformed into a flat shape. Moreover, since the pressurizing heating body 34 and the liquid draining member 35 are arranged in a position close to the cooling roll 36, the adhesive 32 is fed out from the liquid draining member 35 to the cooling roll 36, and the adhesive 32 is cured. Adhesive thread 3
3 can be made as short as possible. When joining two veneers S together, by slightly speeding up the drive timing of the carry-out conveyor 38, the adhesive thread 33 containing the melted adhesive 32 can be delivered to the joining position between the veneers S. . In the figure, reference numeral 37 denotes an adhesive-side retaining portion formed on the liquid draining member 35, where a portion of the adhesive 32 drained as the adhesive attachment thread 33 is turned is retained. Then, the fixed adhesive 32 adheres to the thread 3 as the thread 31 is let out from the liquid draining member 35.

(6) In this embodiment, the bonding thread 9 is pasted on the S surface of the veneer veneer, but the present invention applies to the end face (end face in the fiber direction) of the raw wood when cutting the raw wood with veneer lace. Alternatively, the yarn is attached to the outer circumferential surface with an adhesive, and the yarn is separated from the pressurizing body and positioned around the adhesive, and the yarn is pasted with adhesive, and the veneer is horizontally or vertically serrated, or It is also possible to implement a method in which the veneers are mutually reinforced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing the outline of the veneer bonding device, Fig. 2 is a partially cutaway explanatory view showing the feeding path of the bonding thread, and Figs. 3 and 4 show the state of adhesion of the bonding thread to the veneer. 5 and 6 are explanatory diagrams showing a modified embodiment of the method of the present invention, and FIGS. 7 and 8 are explanatory diagrams showing a conventional example. In the figure, 5 is a cooling roll as a pressurizing body, 6 is a thermoplastic adhesive melting tank as an adhesive tank, 7 is a thermoplastic adhesive as an adhesive, 8 is an adhesive thread, and 9 is a thread. The joining thread, S, is a veneer. Patent applicant Meinan Seisakusho Co., Ltd. Agent Patent attorney Ip Fuji Ken −

Claims (1)

[Claims] 1. After the yarn is impregnated with an adhesive by passing through an adhesive tank, the yarn is adhered to the plywood veneer while the adhesive is cured by a pressurizing body. In the pasting method, the adhesive-attached yarn is fed out from the adhesive tank to the pressurizing body, and the yarn is pasted to the plywood veneer while moving the yarn away from the pressurizing body and positioning it toward the periphery of the adhesive. A method for attaching adhesive-coated foil thread to a veneer veneer. 2. The method of attaching adhesive-coated foil thread to a veneer veneer according to claim 1, wherein the adhesive is made of a thermoplastic adhesive and the pressurizing body is made of a cooling roll. 3. The method for attaching adhesive-coated foil thread to a veneer veneer according to claim 1, wherein the adhesive is made of a thermosetting adhesive and the pressurizing body is made of a heating roll. .