JPS5937221B2 - Manufacturing method of furniture board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a board for furniture, particularly for high-end furniture, using a semi-cured thermal adhesive sheet.

Conventionally, to manufacture this type of furniture board, both sides of the special plywood were given moisture-proofing properties and smoothness was achieved by polishing both sides of a thin phenolic resin laminate and then heating it using an adhesive. They were bonded together using pressure, and then the exposed laminate surfaces were treated with a primer (without this treatment, the adhesion of the paint film applied later would be extremely poor and the paint film would peel off easily), and then paint was applied. .

However, this method requires many work steps and is complicated, and it is difficult to make furniture boards with curved surfaces.
The phenol laminate used must also be curved, which has the disadvantage of causing cracks and cracks in the laminate.

The present invention improves these drawbacks and has a basis weight of 20.
0~400g/771'', density 0.4~0.6y/d
) A semi-cured thermal adhesive sheet formed by coating both sides of paper with a 60-mesh bath powder epoxy resin having a basis weight of 3509/m" or more with a penetration degree of 80 seconds or less, and the semi-cured resin of the sheet The present invention relates to a method for producing a furniture board, which comprises disposing an adhesive sheet having a melt viscosity of 5 or more on a plywood surface, and then heating and pressurizing the adhesive sheet.

The basis weight of the paper used in the present invention is 200 to 400g/7
71″, and the density was limited to 0.4 to 0.61/d.
If it is outside this range, the resin may not be sufficiently impregnated into the paper during manufacture of the furniture board, or the resulting furniture board may have defects in its moisture resistance.

The thickness of the paper used in the present invention is usually 0.3 to 0.8 m.
m) Preferably 0.4 to 0.6 m7! It is assumed that l.

The reason why the permeability of the paper is set to 80 seconds or less is because if it is 80 seconds or more, the permeability of the resin during heating and pressurizing becomes poor. In the present invention, the permeability is a value measured as follows.

A piece of paper measuring 10 degrees vertically and horizontally is placed in castor oil at 23°C, and the time (in seconds) until the castor oil penetrates to the surface of the paper is shown.

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 paper surface during powder coating, especially electrostatic coating, and will tend to fall off. This is because the surface of the subsequent resin layer is not uniform and becomes uneven, resulting in a disadvantage that the amount of resin deposited varies. The amount of powdered epoxy resin attached to paper is 3 grammes.
509/wl, which means the total amount of adhesion on both sides of the paper.

The amount of adhesive on one side of the paper is at least 1009/i basis weight or more.

However, it is preferable that the amount of adhesion on both sides of the paper be approximately equal. In the present invention, the reason why the basis weight is limited to 3509/i or more as described above is that if the basis weight is less than this, the paper will not be sufficiently impregnated during heating and pressing, and a good furniture board will not be obtained.

The amount of powdered epoxy resin attached to paper is 350% as described above.
9/wl or more, but the upper limit is usually up to 700 f1/w and preferably from 3509/w to 500 g/w.

The reason why the flowability of the semi-cured resin of the semi-cured adhesive sheet is limited to 5 or more in the present invention is that if the flow property is other than this, the resin will not be sufficiently impregnated into the paper before curing.

Further, the upper limit of the flowability of the semi-cured resin used in the present invention is usually about 13, preferably about 10.

The flowability was measured as follows.

A 1mm thick iron plate was placed at a 45 degree angle in a dryer at 150℃, and 500! ! 9 semi-rigid resin (6
0 mesh pass (powdered) into 2 diameters 1311
A sample obtained by compression molding (at 20°C) into a circular tablet is placed on the tablet and cured. After curing, the iron plate is taken out and the value is determined using the following formula.

In the present invention, plywood having a thickness of about 1 to 311 mm is usually used, and special plywood is preferably used.

Further, in the present invention, the adhesive sheets are usually placed on both sides of plywood and heated and pressed.

According to the present invention, the semi-cured thermally adhesive sheet is placed on the plywood surface, heated and pressurized to produce a furniture board body, and then paint can be applied without performing an undercoating process, as in the conventional method. Does not require complicated work processes.

Furthermore, in the present invention, even when making furniture boards with curved surfaces, semi-cured thermally adhesive sheets are used to heat and pressurize them.
The present invention will be specifically explained below using examples.

Example 1 Kraft paper-250 manufactured by Okawa Paper Co., Ltd. (thickness 0.
43 fin penetration rate 70 seconds) with Nitto Denko A-stage powdered epoxy resin (trade name T-300) on one side 2009/d.
A semi-cured thermal adhesive sheet with a thickness of 2011
The molding conditions were 130℃, 1
0 minutes, 8kg/C! It was cured at i.

After polishing the molded surface, a paint was applied to obtain a furniture board. Example 2 Craft paper-250 (thickness: 0.43 m, penetration rate: 70 seconds) manufactured by Ogawa Paper Co., Ltd. is coated with Nitto Denko Corporation's B-stage powdered epoxy resin (trade name: NC7OO4) on one side, 2009/2. The semi-cured heat-adhesive sheet was brought into contact with the upper and lower surfaces of a curved surface (500 are) made of special plywood, and was then held in a mold and cured at 130° C. for 10 minutes at 8 kg/CTll.

Claims (1)

[Claims] 1 Basis weight 200-400g/m^2, density 0.4-0.
6g/cm^3, 60 mesh pass powdered epoxy resin on both sides of paper with a penetration rate of 80 seconds or less, basis weight 350g/m^
A semi-cured thermally adhesive sheet formed by two or more coatings, in which the semi-cured resin has a melt viscosity of 5 or more in flowability, is placed on the plywood surface, and then heated and pressurized. A method for manufacturing a furniture board characterized by: