JPS603965B2 - Manufacturing method of continuous veneer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for obtaining a predetermined continuous veneer by compensating for defects such as cracks, knots, and rot in logs. Auxiliary materials that have approximately the same diameter as the raw wood and can be cut, such as urethane foam, ethylene foam, acrylic resin foam, cellulose acetate, or other synthetic resin moldings, and raw wood offcuts are joined together, and then cut using a rotary race. The present invention relates to a method for manufacturing a continuous veneer in which a continuous product, so-called continuous veneer, can be obtained without breaking the veneer during cutting work.

Currently, in plywood factories, the quality of the raw wood used as raw material has deteriorated, and many of them have defects such as cracks, dead knots, and rot, and cut cracks often occur when cutting both ends in the lumber building process. When cutting logs with a rotary lace, a large amount of so-called loose veneers are produced that cannot be wound up with a veneer winding device.

These loose veneers require a lot of manpower, time, and space in the processing process, and in addition, during the processing process, the loose veneers are increasingly split into small and medium veneers with narrow spaces, and these veneers are Processing with a processing device causes a very large drop in efficiency and yield, and in particular, the rotary race's cutting ability is not fully utilized, reducing productivity. Various methods are currently being considered to deal with these problems.
For example, loose veneers are treated with automatic estimating equipment and veneer processing equipment (e.g. composer, edge gluer), but these are both ways to improve the method of processing loose veneers, and improve the walking speed and There is no hope for sufficient labor savings.

Other methods have been devised to obtain continuous veneers by injecting synthetic resin into cracks in logs, but this is difficult to handle for logs with large cracks, and the filling cost is extremely high.
The resin part filled in the cracks of the veneer cut from logs produced by this method is a European foam, which is problematic in terms of practicality as a veneer for plywood. This invention involves joining an auxiliary material such as a synthetic resin molding or wood that is free from defects and can be cut to the end surface of raw wood with a rotary lace when cutting raw wood with cracks or dead lines. It is constructed so that a continuous veneer can be obtained by cutting it within the ruled dimensions.The order in which the method of this invention is carried out is explained with reference to the drawings.Before cutting with a rotary race, If there is a crack 4 on the end surface 3 of log 1, a synthetic resin molded article with approximately the same grain size as log 1 and a length of about 5 mm that can be cut with a rotary lace or a wooden village that satisfies the same conditions. Prepare an auxiliary material 2 such as (FIG. 1A), apply adhesive to the end surface 3 or the adhesion surface of the auxiliary material 2, or both, and join with a french, turnbuckle, etc.The above adhesive For example, moisture-curing polyurethane resin may be used as the material, and large cracks 4 in the raw wood 1 can be injected with synthetic resin in advance. The length of the auxiliary material 2, that is, about 5 skins, is longer than the raw wood without defects such as dead knots and rot.
Figure B) Next, cutting is performed using a rotary race, but in this case, the joint surface 5 must be included within the dimensions of the scoring tools 6 and 6'. Adjust so that the length up to 6 is about 2 to 3 skins,
Cut. In the present invention, if desired, two auxiliary materials may be joined to both ends of the log 1, and the cutting tools 6 and 6' may be combed and inserted into both auxiliary materials for cutting.

The veneer obtained by cutting by this method has a continuous bonding surface 5 at 2 to 3 points from one end of the veneer, as shown in Fig. 2. It can be cut out during the process of forming the board into plywood using a conventionally known method.

For example, it is removed as cutting waste when cutting to desired dimensions in the finishing process, and there is no problem with the product.

[Brief explanation of drawings]

Figure 1 is a slope view showing the state in which auxiliary materials are joined to logs, and Figure 2 is a continuous veneer cut from the logs joined in Figure 1.
FIG. In the figure, 1 is the raw wood, 2 is the auxiliary agent, 3 is the end surface, 6, 6'
indicates Aoi quotation cutlery. Figure 1 Figure 2

Claims (1)

[Claims] 1. A disc-shaped auxiliary material that can be cut is glued and fixed to the end surface of the raw water so as to cover this end surface, and the cutting edge of the ruled material is inserted into the auxiliary material using a rotary race for cutting. A method for manufacturing a continuous veneer, characterized by: