JPS60155883A - Method and device for dehydrating woody 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 [Technical Field] This invention particularly relates to a method and apparatus for dewatering wood veneers that are used as materials for artificially decorated veneers.

[Background technology]

In a normal method for manufacturing artificial decorative veneers, a plurality of wooden veneers are laminated in a mold, pressed and bonded to obtain flitches, and then sliced to create artificial decorative veneers. At that time, the wooden veneer was bleached and then dyed depending on the desired decorative veneer, and after being humidity-controlled (drying), an adhesive was applied 1-1 and placed in a mold.

However, in order to reduce the moisture content to about 150 q6 by drying the wood veneer that has a high moisture content (usually about 250 to 300 cm) during the bleaching and dyeing process,
Since the drying process used thermal energy (steam, electricity, gas), the running cost was extremely high. Moreover, the production cost of the dehydration drying method d apparatus using thermal energy becomes high, and the equipment cost becomes high.

For this reason, a method of compressing and dewatering thick wood veneers using squeeze rolls was experimentally carried out, but veneers themselves are hard and have low strength, and the squeeze rolls are used to compress and dehydrate thick wood veneers. There was a problem in that the veneer would crack because it could not absorb the applied compressive force. In addition, so-called overlap cracking occurred because the veneer meandered during drawing.

[Purpose of the invention]

This invention provides a method and device for dewatering wood veneers, which can efficiently dehydrate wood veneers to a desired moisture content at low cost and without causing veneer cracks using squeeze rolls. The purpose is to provide.

[Disclosure of the invention]

The method for dewatering a wood veneer according to the present invention is characterized by dewatering the wood veneer by passing it between a pair of squeezing rolls under heat.

Furthermore, in the wood veneer dewatering device of the present invention, at least one of the pair of squeezing rolls that dehydrates the wood veneer has a heater for heating the veneer, and a plurality of grooves are formed in the surface. This is a characteristic feature.

An embodiment of the present invention will be described with reference to FIGS. 1 to 7 and 4. FIG. Figure 1 shows the entire dewatering apparatus according to this embodiment, in which a veneer heating section 2 and a pair of squeezing rolls 3a and 3b are provided in sequence along the direction of transport of the wood veneer 1. A heater is imploded inside the squeezing rolls 3a and 3b, and a plurality of grooves 4 are recessed in the surface along the circumferential direction.

For this reason, the thin wooden veneer 1 which has a high moisture content during the decolorization and dyeing process is heated in the Hinoki board heating section 2 and enters the squeezing rolls 3a and 3b.
It is compressed and dehydrated while being heated in b. By heating in the veneer heating section 2 and the drawing rolls 3a and 3b, the wood veneer 1 is softened and at the same time its strength is increased. That is, as the heating temperature of the wood veneer 1 increases, the amount of work required to break the wood veneer 1 increases, and the bending modulus of failure and elastic modulus increase (however, the compressive Young's modulus decreases).

In this way, by using a squeezing roll as a dehydration method, running costs are reduced compared to conventional heating drying methods, and equipment costs are also reduced.

Furthermore, since the wood veneer 1 is compressed and dehydrated under heating, the wood veneer 1 is softened, the stiffness increases, and cracking of the veneer is prevented.

Further, as shown in FIG. 2, a squeezing roll 3a.

By compressing the wood veneer 1 by forming a plurality of grooves 4 on the circumferential surface of the veneer 3b, the wood veneer 1 is embossed, and a part of the wood veneer 1 is inserted into the grooves 4 as shown in FIG. The compressive force is absorbed. Therefore, cracking of the veneer is prevented, and the embossing prevents the veneer 1 from meandering, thereby eliminating overlapping cracks in the veneer.

The wood veneer that has been dehydrated in this way has a moisture content of 15
It quickly dries down to about 0 degrees. After the dehydration treatment, a plurality of wood veneers 1 are laminated together using an adhesive (for example, a moisture-curing urethane resin adhesive, etc.) as shown in FIG. By completely slicing this, a decorative veneer 7 with a wood grain pattern similar to that of natural wood species expressed on the board surface can be obtained.

Next, another method of dewatering wood veneer will be explained. That is,
This dewatering method is performed as shown in FIG.
A water suction nozzle 9 metal is attached to the input side of the wood veneer 1 of 8b, and the squeezed water that accumulates on the input side of the squeezing roll is discharged through a duct to connected to the suction nozzle 9.

(5) The conventional dewatering method uses a squeezing roll l as shown in Figure 6.
Since the wood veneer l is simply passed between la and llb, the water 12 squeezed out of the wood veneer 1 flows to both ends of the wood veneer 1, and the moisture content at both ends 1a of the veneer is lower than that at the center. There was a problem that the water was higher than that of 1b, and uniform dehydration could not be achieved.

Therefore, as mentioned above, by providing the suction nozzle 9 on the squeeze plate input side of the squeezing rolls 8a and 8b and sucking out the water squeezed out from the wood veneer 1, it is possible to obtain a veneer that is uniformly dehydrated over the entire surface. becomes possible. A plurality of veneers thus buttoned and uniformly dehydrated are pressed and bonded together using adhesive in the same manner as described above to obtain 7-rich pieces, which are then sliced to create decorative veneers. In this case, when a moisture-curable urethane resin adhesive is used as the adhesive, it is possible to prevent poor adhesion due to uneven moisture content of the veneer.

It goes without saying that this dehydration method can be used in combination with the dehydration method and dehydration apparatus shown in FIG.

(6) According to the present invention, it is possible to reduce running costs and equipment costs required for dewatering wood veneers, and to efficiently dewater the veneers without causing cracks.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an embodiment of the present invention, Fig. 2 is a front view of the squeezing roll, Fig. 3 is an enlarged sectional view showing the compressed state of the wood veneer, and Fig. 4 is the dehydrated wood veneer. FIG. 5 is a perspective view showing another dewatering method, and FIG. M6 is a perspective view showing a dewatering method using a normal squeezing roll. 1... Wooden veneer, 3a, 3b... Squeezing roll, 4.
・Groove part Fig. 4 Fig. 5 Fig. 6

Claims (2)

[Claims] (1) A wooden veneer is passed through a pair of squeezing rolls under heating.
A method for dewatering wood veneer, which is characterized by dehydrating the wood veneer. (2) A dewatering device for wood veneer, characterized in that at least one of a pair of squeezing rolls for dewatering the wood veneer has a built-in heater for heating the veneer, and grooves corresponding to the number of sheets are formed on the surface.