JPS5837882B2 - Method of manufacturing water-resistant particle board - Google Patents

Description

[Detailed Description of the Invention] Particle boards made by thermo-pressing a mixture of wood chips and adhesives undergo significant dimensional changes due to moisture absorption and dehumidification, regardless of whether they are single-layer boards or multi-layer boards. It has the disadvantage of causing significant swelling in the thickness direction due to water absorption.

In order to eliminate the above disadvantages, a method is known in which wood is immersed in a treatment solution containing a paraffin emulsion-type water repellent and a water-soluble water repellent; When this emulsion-type paraffin adheres to the surface of the wood, the paraffin particles adhere in a superimposed state due to the emulsion type, making it difficult to form a uniform coating after drying, resulting in many uneven surfaces. Forms an uneven coating.

Therefore, there is a drawback that there are local differences in waterproof and moisture-proof performance.

The present invention solves the above-mentioned drawbacks, and relates to a method for producing water-resistant particle board, which comprises immersing the particle board in molten paraffin, draining the liquid, and then cooling the board.

This invention will be described in further detail below.

Put solid paraffin (refined paraffin manufactured by Nippon Seiro Co., Ltd., melting point 66.1'C) in a container and dry it in a dryer to 85-13
Melt solid paraffin by indirect heating to 5°C, and add 1 particle board with a three-layer structure using chips with a thickness of L2mrn with a fine surface layer and a rough inner layer into the liquid.
After being immersed for 0 seconds to 5 hours, the sample was taken out, excess paraffin was removed, and the sample was cooled at room temperature.

The particle board obtained by straining in this way (because the surface is highly dense, there is little penetration of paraffin from the surface,
It was infiltrating exclusively through the wood mouth.

It should be noted that although the penetration of paraffin from the surface of the particle board is small, it is very small, and some paraffin adheres to the surface.

This paraffin is also known as a mold release agent, and it was difficult to apply cloth to a particle board surface with paraffin attached to the surface or to fix carpets with adhesive tape.

However, if 80 to 12097 m of acrylic paint is applied to the surface of this particle board, it will have good adhesion to other materials, and even if particle board with paraffin attached to its surface is used as a subfloor, it will not work. Enables vinyl tile construction and carpet construction.

Furthermore, particle board whose water resistance has been improved by adding paraffin to the chips can also have good adhesion to other materials by applying an acrylic or other paint to its surface.

In addition, as a method to prevent paraffin from actively adhering to the surface of the particle board, as shown in FIG.
Sandwich the particle board 1 by sequentially abutting the thick steel plates 3 (generally thick plywood with a large area), insert the long bolts 5 into the through holes 4 provided on both sides of the thick steel plates 3, and tighten the nuts 6. Be nervous.

7 is a handle for hanging.

Note that the work is easier if the bolts 5 are fixed to the lower thick steel plate 3.

Further, the through hole 4 may be a U-shaped notch.

The particle board tightened as described above is immersed in a container 8 containing molten paraffin for 10 to 60 seconds,
Allow the paraffin to penetrate only through the grain of the particle board.

By infiltrating the paraffin in such a tight manner, it is possible to prevent the bulging of the end of the particle board (which occurs when the paraffin is infiltrated from the end of the particle board).

After the particle board is immersed in molten paraffin, the liquid is drained and cooled, so a uniform paraffin film can be formed on the surface of the particle board.
It has the advantage of having a uniform waterproofing and moisture-proofing effect on all parts of the particles, excellent water resistance, and very small dimensional change.

[Brief explanation of drawings]

The drawing is a perspective view showing an embodiment of the invention. In the drawings, Ht particle board, 26J constant plate, 3 thick steel plate, 4 through hole, 5ζ bolt, 6 (j nut).

Claims (1)

[Claims] 1. A method for producing water-resistant particle board, which comprises immersing particle board in molten paraffin, draining the liquid, and cooling it.