JPS6058029B2 - Board manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a board, particularly a board used as a table tennis table.

Conventionally, in order to manufacture a table tennis table, the steps of polishing a special plywood or particle board, applying a colored paint, and drying were repeated two or three times.

This was done to prevent uneven coating on the surface of the table tennis table and to improve its smoothness.

However, this method has the disadvantage that the working process is very complicated.

The present invention improves these drawbacks and has a thickness of 2.
A semi-finished material made by coating a colored nonwoven fabric with a 0 to 110 μm and an apparent density of 0.2 to 0.5 da/cTi with a 60 mesh bath powder resin containing no colorant at a basis weight of 80 to 200 da/wl. The present invention relates to a method for manufacturing a board, which comprises laminating a cured thermally adhesive sheet on a hard board surface such that the resin layer surface of the adhesive sheet is in contact with the hard board surface, and then heating and pressurizing the sheet.

In the present invention, the reason why the thickness of the colored nonwoven fabric is limited to 20 to 110μ and the apparent density to 0.2 to 0.5y/Cd is that if the thickness is outside this range, the resin impregnation of the powdered resin into the nonwoven fabric will decrease. This is because they have drawbacks such as deterioration of the properties and reduction of strength as a base material.

The reason why the nonwoven fabric is colored in advance is that even if the powder resin is applied unevenly, when the nonwoven fabric is used as a board, uneven coloring can be prevented as a board. In the present invention, it is not preferable to add a powdered resin coloring agent because it causes color unevenness on the surface of the resulting board. In the present invention, it is preferable to use a water-soluble dye to color the nonwoven fabric.

The particle size of the powdered epoxy resin used in the present invention is 60
The reason why we limited it to mesh baths is that if powders other than 60 mesh bath products are used, powders with large particle sizes will not adhere well to the nonwoven fabric during powder coating, especially electrostatic coating, and will tend to fall off, as well as being heated. This is because the surface of the resin layer after melting is not uniform, resulting in unevenness, resulting in the inconvenience of variations in the amount of resin deposited.

In the present invention, the reason why the amount of powdered resin applied onto the colored nonwoven fabric is limited to 80 to 200 da/77
If it is less than 1", the impregnation of the resin into the base material is poor, and if it is less than 200y/
This is because when the powdered resin is coated on the colored nonwoven fabric to form a semi-cured state, the resin may fall off even if it is melted.

In the present invention, the powdered resin may be coated on one side or both sides of the colored nonwoven fabric.

In the present invention, examples of the hard board include special plywood and particle board.

The nonwoven fabric also includes paper.

As the powdered resin, thermosetting resin powder, especially epoxy resin powder is preferable.

According to the present invention, a board is manufactured by disposing a semi-cured thermally adhesive sheet on the surface of a hard board and heating and pressurizing the sheet, thereby making it possible to obtain a good board without the need for complicated work processes as in the past. .

The present invention will be specifically explained below using examples. In the examples, parts are parts by weight. Example 1 Water-soluble dye PrimulaYell manufactured by Hodogaya Chemical Industry Co., Ltd.
8 parts of Ow2R and the company's water-soluble dye DirectSky
A dye solution was obtained by uniformly mixing 2 parts of Blue Station and 1 (4) parts of water.

Overlay paper (manufactured by Daifuku Paper Co., Ltd., thickness 40 mm) was added to this aqueous solution.
μ, apparent density 0.45y/c! After soaking l),
Colored overlay paper was made by drying with infrared rays.

The obtained colored overlay paper was coated with 100 y/wl of A-stage powdered epoxy resin manufactured by Nitto Denko Corporation (trade name T-300) only on one side and heated at 1200 C for 158 hours to form a semi-cured thermal adhesive sheet. . Next, the resin layer side of the obtained adhesive sheet was brought into contact with the surface of a special plywood board and cured by heating at 130°C, 1 powder, and 8k9/d.

The surface of the board obtained was dark green, smooth with no color unevenness, and had good surface rigidity, and the repulsive force of the ping pong ball was large and the speed was fast.

Example 2 Rayon paper (manufactured by Daifuku Paper Co., Ltd., thickness 52μ, apparent density 0)
．． 28y/d) was colored in the same manner as in Example 1.

This colored rayon paper was coated with 180 g/l of B-stage powdered epoxy resin (trade name: NC-7004) manufactured by Nitto Denko Corporation only on one side to form a semi-cured heat-adhesive sheet.

Next, the resin surface of this adhesive sheet was brought into contact with the surface of particle board a, and the resin was cured under heat and pressure at 130 DEG C., 1 powder, and 8K9/CFlf to obtain a board.

The surface of the obtained board was a dark green color with no color unevenness, was smooth, and had good surface rigidity.

Claims (1)

[Claims] 1 Thickness 20~110μ, apparent density 0.2~0.5g
/ cm^3 colored non-woven fabric with no colorant added 60
The basis weight of mesh pass powdered resin is 80 to 200 g/m^
A method for manufacturing a board, which comprises: laminating a semi-cured thermally adhesive sheet obtained by applying two coats on a hard board surface such that the resin layer surface of the adhesive sheet is in contact with the hard board surface, and then heating and pressurizing the sheet. .