JP2823398B2 - Veneer drying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to post-processing after veneering a veneer.

[0002]

2. Description of the Related Art In a veneer subjected to WPC processing, if resin remains on the surface of the veneer, a blocking phenomenon occurs when the veneer is loaded and cured and dried, thereby lowering the yield of the veneer. Was. For this reason, conventionally, the veneer-processed veneer is subjected to a hardening / drying process with release paper interposed between the veneers.

[0003]

However, in the prior art, the release paper had to be sandwiched between the veneers, and the workability was extremely low. The present invention has been made in view of the above problems, and the object thereof is to:
An object of the present invention is to provide a method for drying a veneer, which does not cause a blocking phenomenon even when the veneer after the WPC treatment is stacked and dried and which can be processed in a series of steps, and which is extremely excellent in workability.

[0004]

According to the method for drying a veneer of the present invention, the resin on the surface of the veneer that has been subjected to the WPC process is heated with a hot-press roll.
It is characterized by being removed or hardened by a heating means such as a net dryer or a hot press, and then dried, and the above-mentioned problem has been solved by this configuration.

[0005]

Since the resin on the surface of the veneer is removed or hardened by the heating means, the occurrence of a blocking phenomenon can be suppressed even when it is loaded and dried, and the drying time can be shortened. Excellent workability.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A veneer, for example a 1.5 mm oak veneer, is impregnated with a resin, for example, a water-soluble melamine resin by a reduced-pressure method. Next, the oak veneer subjected to the WPC treatment is taken out of the pressure cooker and passed between hot rolls at 130 to 150 ° C. The speed is 1-2 m / min. The speed may be increased by increasing the temperature of the hot roll. Thereby, the resin on the surface of the veneer is removed or hardened, and the moisture is also removed.

Thereafter, the veneers are stacked and the resin is cured and the veneers are dried by the same high-frequency dryer as before. According to this method, the occurrence of blocking is conventionally 10 to 15
%, But can be suppressed to 2.5% or less, and the drying time has conventionally been 7 to 8 days.
It could be shortened to ~ 6 days.

The veneered veneer is taken out, and a reduced bleaching agent, for example, an oxalic acid aqueous solution is applied to the surface of the veneer for about 40 to 50 minutes.
It may be applied at 50 g / m ² or dipped in an aqueous oxalic acid solution. In this case, so-called iron contamination in which iron reacts with lignin or the like in water to turn brown or black can be prevented, and since the surface resin can be cured, the occurrence of blocking can be further suppressed.

In drying the veneer, the inside of the pot is evacuated and dried under reduced pressure. For example, when the material temperature of the veneer is 20 ° C., the degree of vacuum is 17 to 18 Torr, preferably about 10 Torr, so that the water in the kettle is brought into a boiling state. After holding under the reduced pressure for 4 to 5 hours, the drying conditions (atmospheric pressure) similar to those in the related art may be returned to cure the resin and dry the veneer. The boiling water is condensed, collected and discharged to the outside. By introducing the reduced pressure drying step in this way, the entire drying time can be reduced by about one day, and since the drying is performed under reduced pressure at the beginning of drying, damage such as cracks or irregularity does not occur in the veneer. is there.

[0010]

According to the present invention, the resin on the surface of the veneer subjected to the WPC treatment is removed or hardened by a heating means such as a hot-press roll, a net dryer, a hot press and the like, and then dried. Even if it is dried, the occurrence of a blocking phenomenon can be suppressed, the drying time can be shortened, and it can be processed in a series of steps, and it is excellent in workability.

Claims (3)

(57) [Claims] 1. A method for drying a veneer, comprising removing or curing the resin on the surface of the veneer subjected to the WPC treatment by a heating means such as a hot-press roll, a net dryer, a hot press, and then drying. 2. The veneer drying method according to claim 1, wherein a reducing bleach is applied to the veneer surface before the resin on the veneer surface is removed or hardened by heating means. 3. The drying of a veneer according to claim 1, wherein the veneer is dried or reduced under atmospheric pressure after the resin on the surface of the veneer is removed or cured by a heating means. Method.