JPH045B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The purpose of the method for manufacturing gypsum board according to the present invention is to solve the drawbacks of gypsum board, which is currently widely used in construction.

Gypsum board is used as a base material for construction because it is cheaper than other materials and is relatively easy to construct, but it has poor bending and impact strength, making it difficult to use on walls such as walkways, stairs, and children's rooms. can not be used, and the decorative paper attached to the surface may peel off due to indoor condensation, or when the decorative paper is replaced, the paper on the surface of the plasterboard also peels off, and the plasterboard itself must be replaced. It had drawbacks.

The method of the present invention solves these drawbacks and provides an excellent construction board. Examples will be described in detail below.

(Description of Examples) The gypsum of the core layer 1 is commonly used, and if necessary, fibrous materials may be mixed in to strengthen it. The front and back cardboards 2, 2 are mainly made of waste paper and must have water absorption of a certain amount or more, and those with improved water resistance are more preferable. The thin natural wood boards 3, 3 are bonded to the cardboard with an adhesive, and the desired performance can be obtained by using either a hardwood veneer or a softwood veneer, and either a rotary cut or a slice cut.

Next, the manufacturing process of the gypsum board of the present invention will be explained step by step.

FIG. 3 shows a thin gypsum board in which cardboard 2, 2 is pasted on both the front and back sides of the gypsum core layer 1.

Next, as shown in FIG. 3, adhesives c and c are applied to the front and back surfaces of the cardboard sheets 2 and 2 using a spreader. The adhesive c may be either heat-cured or room-temperature cured, but it is preferable that it has a small amount of shrinkage after curing. This is because if the amount of shrinkage is large, the board is likely to warp or twist after bonding. If a thermosetting water-based adhesive is used, a urea resin adhesive that is bonded by hot pressing is generally used, but it is necessary to add an filler or the like to reduce the shrinkage force.

Next, natural wood thin plates 3 and 3 are adhered and deposited on adhesives c and c and left for 30 minutes or more. In this way, the water content of the adhesive c will penetrate into the plasterboard, and warping or twisting will not occur after hot pressing. The thickness of each thin natural wood board 3 is preferably in the range of 0.2 to 0.3 m/m, but is preferably around 1 m/m from an economical and performance standpoint. This is because if it is less than 0.2 m/m, there is little improvement in strength, and if it is more than 3 m/m, the shrinkage force and twisting of the wood will be affected.

Next, it is hot pressed using a hot press h. Heat pressing is carried out at 2 to 8 kg/cm ² , 80 to 110° C., and 10 seconds to 3 minutes. In this way, a rough-sized original plate of gypsum board is obtained.

Next, as shown in Figure 3, double sizer d
The rough size original plate B is cut to a predetermined size.

At this time, the double sizer d applies pressure to the rough size original plate, so that the rough size original plate is deformed once and then restored. When restored, the natural wood thin board 3 has a high degree of restoration because the natural wood thin board 3 is strong and the gypsum substrate made of the gypsum core layer 1 and the base paper 2 is plastic. As a result, from the end surface of the gypsum board, the natural wood thin plate 3
A gypsum board with the end of the wood slightly protruding as shown in Figures 3 and 2 is obtained.

(Effects of the present invention) The building board material obtained by the method of the present invention has fire retardant properties,
It has sound insulation properties (specific gravity 0.7-0.9), and the natural wood laminate on the surface is located in the most favorable position for external stress, improving bending strength, impact resistance, and nail-pulling resistance, making it suitable for use as a wall base board. The decorative paper will not peel off, and the decorative paper will not peel off from the cardboard when re-covering (because the natural wood thin board disperses stress).
Even if you use it as is, you can still get the feel of natural wood.

At the end of the wood, the thin natural wood board protrudes from the core layer 1 of plaster, so it can be attached well as shown in Figure 2, making construction easier.

After the adhesive c is applied to the front and back surfaces of the cardboards 2, 2, it is left to adhere and accumulate, so that the adhesive penetrates into the plaster core layer 1 and does not cause warping or twisting after hot pressing.

[Brief explanation of drawings]

Figure 1: Cross-sectional view of a construction board obtained by the method of the present invention, Figure 2: Side view of the butting part, Figure 3.
Figure: ~: Process diagram of the method of the present invention, 1... Core layer of gypsum, 2... Cardboard, 3... Thin natural wood board, c... Adhesive, h... Hot press, d...
...double sizer, ...gypsum board substrate, ...
...Rough dimension original board, ...gypsum board.

Claims (1)

[Scope of Claims] 1. Applying adhesives c, c to the front and back surfaces of a gypsum substrate with cardboard 2, 2 pasted on the front and back surfaces of a gypsum core layer 1,
Next, the natural wood thin plates 3, 3 of the gypsum substrate coated with adhesives c and c are adhered and deposited, left for more than 30 minutes, and then hot-pressed with a hot press h to form a rough dimension original plate of the gypsum board. This method of manufacturing a gypsum board is characterized in that a gypsum board in which the end of the thin natural wood board 3 is slightly protruded from the end of the gypsum original board is obtained by cutting the original board with rough dimensions into predetermined dimensions.