JPS592716B2 - How to attach adhesive materials such as tape adhesive thread to veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to adhering an adhesive material such as an adhesive tape or a thread coated with a thermoplastic adhesive to a veneer.

Conventionally, equipment for substrates such as decorative paper (Special Publication No. 43-1085)
3), but in this device, when bonding a sheet-like material to the surface of a substrate such as plywood using a pair of upper and lower pressure rollers, the rotation speed of the upper pressure roller is set to be slightly slower than that of the lower pressure roller. This device is configured to compress a sheet-like object while pulling it backward, thereby preventing the occurrence of wrinkles and the like.

If such a device is used to attach tape or the like to the veneer for reinforcing the end of the veneer and splicing the sides during the plywood manufacturing process, for example, in the finishing process, the driven roll will be removed as shown in Figure 1. 1
In this way, the tape 2 is brought into contact with the surface of the advancing veneer 3 by induction pressure and adhered thereto.

That is, the tape 2 is pulled on the veneer 3 and is adhered to the veneer 3 under tension, and the veneer after adhesion is attached to the second veneer.
As shown in the figure, it becomes an arc shape. When such veneers are cut to a certain length and stacked, it is difficult to stack them in an orderly manner, and the number of veneers stacked is smaller than when flat veneers are stacked. In addition, the adhesion of the adhesive material under tension is poor; for example, if a thread 6 coated with molten hot melt is used instead of tape, the glued thread will form a round shape as shown in Figure 3. Therefore, the adhesive area is small and the adhesive force is weak.

The present invention solves the above-mentioned problems and will be explained in detail below with reference to Examples.

As shown in FIGS. 4 and 5, the roll 4 that conveys the veneer T
A tapered roll 5 having a rotating shaft in substantially the same direction as the roll 4 is rotatably provided on the top, and as shown in FIG. The circumferential surface of the tapered roll 5 on the roll 4 side is arranged to be slightly inclined with respect to the circumferential surface of the roll 4 so as to be closer to the roll 4 than the circumferential surface.

Further, the thread 6 to which the molten hot melt is adhered is made to stand by at an arbitrary location on the larger diameter side of the tapered roll 5, and the distance 11 between the tapered roll 5 and the roll 4 is set at the part where the thread 6 is waiting.
is set to approximately the same value as the thickness of the veneer to be bonded.
The present invention is provided, for example, as described above, and its effects are as follows.

When the veneer T is conveyed on the roll 4 and sandwiched between the veneer T and the tapered roll 5, the tapered roll 5 is rotated by the frictional force from the veneer T.

At this time, since the smaller diameter side of the tapered roll 5 is closer to the surface of the roll 4, the frictional force generated between it and the veneer T is greater than the larger diameter side of the tapered roll 5. The peripheral speed of the tapered roll 5 on the smaller side is the same as the veneer 7
Therefore, the circumferential speed of the tapered roll 5 at the part where the thread 6 is kept on standby is naturally higher than the advancing speed of the veneer 7, and the thread 6 has a length longer than the passing length of the veneer. It is supplied and bonded to the surface of the veneer 7 without receiving any tension from the veneer 7. Therefore, the bonded threads 6 are spread out as shown in Figure 6, and the bonding area is wide and the bonding force is strong, and the veneer after bonding is not arcuate but flat. When cutting and stacking veneers after bonding to a certain length, it is possible to stack them in an orderly manner, and it is possible to stack more veneers than if they were arranged in an arc shape, and the number of times the stacked veneers can be taken out is reduced. This also reduces the amount of lost time.

Also, it becomes easy to insert the plate from the conditioning process into the next process, the spreader.

In other words, since it is necessary to insert the veneer into the application rolls with almost no gap between the soil application rolls, there is no need to press the veneer while inserting it, and there is no need to bite the veneer diagonally. This makes handling easier.

Incidentally, in the embodiment, the thread 6 may be bonded while cooling the tapered roll by passing cooling water thereinto.

Also, by using a tapered roll, this can be carried out without the need for a special speed-up device, but the same effect can be obtained even if a cylindrical roll is used instead of the tapered roll and rotated by a motor faster than the advancing speed of the veneer. is obtained.

As described above, the present invention will make a significant contribution to the plywood industry as long as it can effectively bond adhesives such as adhesive tapes and threads coated with thermoplastic adhesives to veneers. .

[Brief explanation of the drawing]

The drawings show an example of the present invention, in which Fig. 1 is a conventional tape bonding device, Fig. 2 is a perspective view of a veneer after being bonded with tape, and Figs. 3 and 6 are views taken in the direction in which the veneer is traveling. FIG. 4 is a side view of the embodiment of the present invention, and FIG. 5 is a partial cross-sectional view of FIG. 4 when viewed from the dashed line AN in the direction of the arrow. 4... Roll, 5... Tapered roll, 6... Thread with hot melt attached.

Claims (1)

[Claims] 1. When adhering an adhesive material such as tape or adhesive thread to a advancing veneer by induction pressure welding with a roll, the circumferential speed of the roll is set to be higher than the advancing speed of the veneer, and the length of the adhesive material such as tape or adhesive thread is determined. A method for adhering an adhesive material such as tape or adhesive thread to a veneer, which is characterized by adhering the tape to the veneer by making it longer than the length of the veneer.