JPH08244160A - Gypsum particle board and its manufacture - Google Patents

Abstract

PURPOSE: To manufacture continuously gypsum particle boards regardless of size by forming a gypsum layer composed of dihydrate gypsum with natural fibers and the like embedded in its surface and also forming a wood chip layer having a constitution of crushed wood chips arranged in order in a core layer, in which crushed wood chips are larger as they are closer to a core and smaller as they are away from the core, set inclinedly toward a surface layer. CONSTITUTION: Fluid gypsum liquid gw is prepared by adding water to hemihydrate gypsum powder (g) and flowed onto a coal plate 12 and smoothed horizontally, and then a woven cloth or a non-woven cloth F of natural fiber or chemical fiber, for example, a net is embedded into the gypsum liquid gw . Then powdery wood chips Cg to which hemihydrate gypsum powder (g) adheres are classified onto the gypsum liquid gw . After that, when the coal plate 12 is moved forward, out of the crushed wood chips Cg to which hemihydrate gypsum powder (g) adheres, smaller wood chips Cg first, and them larger wood chips Cg are accumulated successively in order. When the coal plate passes through a blow-off device 13, larger wood chips Cg , smaller wood chips Cg , and then hemihydrate gypsum powder (g) are accumulated successively in order to form a mat 1A. Then the non-woven cloth F is placed on the mat 1A and the gypsum liquid gw is flowed, smoothed horizontally and cured to manufacture a gypsum particle board 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gypsum particle board suitable for an interior material such as a floor material, a wall or a ceiling, and a method for producing the gypsum particle board.

[0002]

2. Description of the Related Art Generally, a particle board formed by molding a wood piece into a plate shape with an adhesive such as a urea resin, a phenol resin, or a melamine resin, or a wood chip cement board formed by molding a wood piece into a plate shape using cement as a binder is known. ing. In addition, gypsum board containing 1 to 10% of natural fiber or chemical fiber as a reinforcing material is commercially available.

[0003]

However, the above-mentioned particle board has small specific gravity and high strength and is excellent in workability, but has a drawback that it is inferior in fire resistance and dimensional stability. Further, although the wood chip cement board and the gypsum board are excellent in fireproofness, they have drawbacks that they have large specific gravity, low strength, and low workability.

It has been attempted to form a wood piece into a plate shape using gypsum as a binder, but there is a problem that the adhesion between the gypsum and the wood piece is low and the strength and water resistance are lower than those of other competing products. is there. That is, gypsum is obtained by adding more water than water to be crystal water to hemihydrate gypsum to change it to dihydrate gypsum, but usually a mixed solution of hemihydrate gypsum and water is in a fluid state, When the wood chips are mixed with the mixed solution, they are hardened in a dumpling shape, so that it is difficult to uniformly mix them. In particular, it is extremely difficult to process the edges.

The present invention has been made in view of the above problems, and provides a gypsum particle board which is a composite material of gypsum and wood chips, which is suitable as an interior material, and relates to the size of the gypsum particle board. It is intended to provide a method for producing a gypsum particle board that can be continuously produced without using the method.

[0006]

The gypsum particle board of the present invention has a gypsum layer made of gypsum dihydrate in which a woven or non-woven fabric of natural fibers or chemical fibers is embedded in the surface layer, and the gypsum particle board faces the surface layer in the core layer. It is characterized by having a layer of wood chips that inclines in order from large and large crushed wood pieces.

In the method for producing gypsum particleboard of the present invention, a fluid gypsum water solution containing water added to hemihydrate gypsum powder is poured and leveled horizontally, and then woven fabric of natural fibers or chemical fibers or By embedding a non-woven fabric, and adding water to it and classifying the crushed wood pieces to which the hemihydrate gypsum powder is attached, the hemihydrate gypsum powder is deposited on the surface layer, and the core layer is crushed to a large extent toward the surface layer. A small crushed piece of wood is deposited in order from a piece of wood to form a mat, and then the mat is temporarily pressed, and then a woven or non-woven fabric of natural fibers or chemical fibers is placed on the mat. It is characterized in that the liquid is poured and leveled horizontally to be cured.

[0008]

[Function] In the gypsum particle board of the present invention,
By having a high density gypsum layer reinforced by fibers on the surface layer and a light and high-strength wood piece layer in the core layer respectively, the specific gravity is smaller and the strength is higher than wood piece cement board or gypsum board. Dimensional stability is higher than that of particle board, and it has excellent fire resistance. Further, it has good heat insulating properties and sound insulation properties, and can be easily processed and constructed on site, and is suitable for interior materials such as floor materials, inner walls, and ceilings.

Further, in the method for producing a gypsum particle board of the present invention, a woven fabric or a non-woven fabric made of fibers is embedded in a gypsum water solution, and then water is added to the ground wood chips to which hemihydrate gypsum powder is attached. After classifying, and then temporarily pressing, a woven or non-woven fabric made of fiber is disposed and a gypsum water solution is flown to cure the gypsum particle board suitable as an interior material regardless of size, and continuously. , Can be easily manufactured.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a gypsum particle board 1 of the present invention. This gypsum particle board 1
Is a woven or non-woven fabric F of natural fibers such as plant fibers or mineral fibers or chemical fibers such as synthetic fibers or inorganic fibers, for example, a gypsum layer 2 made of dihydrate gypsum G in which a net is embedded. At the same time, a wood piece layer 3 is formed on the core layer, the wood piece layer 3 being inclined in the order from the large crushed wood piece C toward the surface layer to the small crushed wood piece C.

This gypsum particle board 1 has a high density gypsum layer 2 reinforced by a woven or non-woven fabric F made of fibers on the surface layer, so that the gypsum particle board 1 has small expansion and contraction, excellent dimensional stability, and high strength. In addition, it has the advantage of being excellent in fire protection. That is, the temperature does not exceed 100 ° C. until the water of crystallization contained in gypsum dihydrate is dehydrated, and a certain time can be secured before firing. Moreover, since the wood piece layer 3 that is light and has high rigidity is formed on the core layer, the specific gravity is low, the strength is high, the nail holding power is high, and the workability and construction at the site are excellent, and the heat insulating property is high. Good sound insulation. As a result, interior materials,
For example, it is suitable for floor materials, inner walls, and ceilings.

In order to manufacture such a gypsum particle board 1, first, wood, for example, lauan is cut with a chipper to a thickness of about 0.5 mm and a length of about 50 mm, and then,
Crush with a hammer mill. In addition, some large pieces of wood
Grind with a Pearlman mill. These crushed wood pieces have a water content of 100 to 13 without undergoing a drying process.
Adjust by adding water to 0%. And hemihydrate gypsum powder is made to adhere to these crushed wood pieces.

On the other hand, as shown in FIG. 2, hemihydrate gypsum powder g
Liquid gypsum water liquid by adding water to g _wMake a call board
After pouring on 12 and leveling horizontally, this gypsum water solution g_wHeaven
Natural or chemical fiber woven or non-woven fabric F, eg
For example, bury the net. Then, the above-mentioned hemihydrate gypsum powder g
Crushed wood chips C attached_gLiquid gypsum water liquid g_wMinutes on
Classify. That is, ground wood to which hemihydrate gypsum powder g is attached
Piece C_gAnd a mixture of hemihydrate gypsum powder g in hopper 11
From the blowing device 13 in the front-back direction.
When air is ejected (in the left-right direction in FIG. 2), it contains water,
Large crushed wood piece C with hemihydrate gypsum powder g attached_gIs air
It will fall as it is without being affected by
A small crushed piece of wood C to which hemihydrate gypsum powder g is attached_gBut
It is blown away, and hemihydrate gypsum powder g
Will be blown away.

When the caul plate 12 is moved forward (in the direction of the arrow in FIG. 2), hemihydrate gypsum powder g is placed on the gypsum aqueous solution g _{w at} the rear side with respect to the moving direction of the caul plate 12. Among the crushed wood pieces C _g that have been deposited and to which the hemihydrate gypsum powder g has been attached toward the front thereof, small wood pieces C _g to large wood pieces C _g are sequentially stacked. Then, after passing through the blowing device 13, contrary to the above, large pieces of wood C _g , small pieces of wood C _g , and hemihydrate gypsum powder g are deposited in this order. As a result, first, hemihydrate gypsum powder g is deposited on the fluid gypsum water solution g _w leveled on the caul plate 12, and then, from the small crushed wood pieces C _g toward the core layer, large crushed wood pieces are obtained. After C _g is sequentially deposited, small crushed wood chips C _g are sequentially deposited from the large crushed wood chips C _g toward the surface layer, and hemihydrate gypsum powder g is again deposited on the surface layer to form the mat 1A. It is a thing.

Thereafter, the mat 1A was temporarily pressed.
After that, woven fabric of the above-mentioned natural fiber or chemical fiber
Alternatively, a non-woven fabric F is provided, and further, a fluid gypsum water solution.
g_wFlush and level horizontally to cure. Meanwhile, hemihydrate stone
Gypsum powder liquid is a fluid gypsum water liquid g _wExcess water and powder
Ground wood C_gLiquid gypsum that takes in the water contained in
Water g_wAlong with dihydrate gypsum G, gypsum party
The ruboard 1 will be manufactured.

As a result, the gypsum particle board 1 which is excellent in fireproofness, dimensional stability, workability, and is light and has high strength can be continuously and easily manufactured regardless of its size.

In particular, since the surface of the gypsum water solution g _w provides a dense and smooth surface, when the corrugated board 12 is formed with an uneven pattern, the plaster particle board has a clear and beautiful surface with the uneven pattern. 1 can be manufactured.

By the way, in the above-mentioned embodiment, the hemihydrate gypsum powder g and the crushed wood pieces C _g to which the hemihydrate gypsum powder g is adhered are classified by using the wind force, but gravity sorting is used. You can also For example, as shown in FIG. 3, hemihydrate gypsum powder g and hemihydrate gypsum powder g from the hopper 11
It is also possible to form the mat 1A by dropping the crushed wood chips C _g to which is attached to the inclined plate 15 via the guide plate 14 and utilizing the difference in repulsive force. That is, the crushed wood pieces C _g that have fallen on the inclined plate 15 bounce up and fall far away, while the hemihydrate gypsum powder g slides along the inclined plate 15 and falls right below the lower edge thereof. Therefore, after leveling horizontally flowing fluidized gypsum water solution g _w on call plate 12, are embedded woven or nonwoven F of natural fiber or chemical fiber, by moving the call plate 12, call Hemihydrate gypsum powder g is deposited at a position just below the lower end of the inclined plate 15 which is located rearward with respect to the moving direction of the plate 12, and the hemihydrate gypsum powder g that is previously accumulated as the caul plate 12 is moved. A small piece of wood C _g and a large piece of wood C _g are deposited in this order. Further, when passing over the other inclined plate 15, contrary to the above, a large piece of wood C
_g , small pieces of wood C _g and hemihydrate gypsum powder g will be deposited in that order.

In this case as well, hemihydrate gypsum powder g is deposited on the surface layer on the fluid gypsum water solution g _w leveled on the caul plate 12, and the ground layer becomes larger toward the surface layer on the core layer. The small crushed wood pieces C _g are sequentially deposited from C _g to form the mat 1A. Hereinafter, as described above, after the mat 1A is temporarily pressed, a woven or non-woven fabric F of natural fibers or chemical fibers is arranged thereon.
Furthermore, the gypsum particle board 1 can be manufactured by pouring a fluid gypsum water solution g _w , leveling it horizontally, and hardening it.

In addition to this, classification by sieving may be used, or these may be used in combination.

[0022]

As described above, in the gypsum particle board of the present invention, a gypsum layer made of gypsum dihydrate in which a woven or non-woven fabric of natural fibers or chemical fibers is embedded in the surface layer, and the core layer facing the surface layer. Since it has a wood chip layer that inclines in order from large and small crushed wood pieces to small crushed wood pieces, it has smaller specific gravity and strength than wood chip cement boards and gypsum boards, and also has higher dimensional stability than particle boards and fire protection. It is also excellent in sex. Furthermore, it has good heat insulation and sound insulation properties, which facilitates on-site processing and construction.

In the method for producing gypsum particle board of the present invention, a woven or non-woven fabric made of fibers is embedded in an aqueous gypsum solution, and then water is added to classify crushed wood pieces to which hemihydrate gypsum powder is attached. Then, after temporarily pressing, a woven or non-woven fabric made of fibers is arranged, and by further flowing and curing a gypsum water solution, a gypsum particle board suitable as an interior material is continuously produced regardless of its size. And, it can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a gypsum particle board of the present invention.

FIG. 2 is an explanatory view showing a classification step when manufacturing the gypsum particle board of the present invention.

FIG. 3 is an explanatory view showing another classification step when manufacturing the gypsum particle board of the present invention.

[Explanation of symbols]

1 gypsum particle board 1A mat 2 gypsum layer 3 wood piece layer C crushed wood piece C _g hemihydrate gypsum powder adhered crushed wood piece G gypsum (dihydrate gypsum) g hemihydrate gypsum powder g _w gypsum water liquid F fiber woven cloth or Non-woven

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location E04F 13/16 8913-2E E04F 13/16 A

Claims (2)

[Claims] 1. A gypsum layer made of gypsum dihydrate in which a woven or non-woven fabric of natural fibers or chemical fibers is embedded is provided in the surface layer, and the core layer is inclined from the large crushed wood piece to the small crushed wood piece in order toward the surface layer. A gypsum particle board having a wood chip layer. 2. A fluid gypsum water solution containing water added to hemihydrate gypsum powder is flowed and leveled horizontally, and then a woven or non-woven fabric of natural fibers or chemical fibers is embedded, and water is placed thereon. By classifying the crushed wood pieces to which hemihydrate gypsum powder is added and deposited, while depositing hemihydrate gypsum powder on the surface layer,
A large crushed wood piece to a small crushed wood piece are sequentially deposited on the core layer to form a mat, and then the mat is temporarily pressed, and then a woven or non-woven fabric of natural fibers or chemical fibers is placed on the mat. Then, a method for producing a gypsum particle board, characterized by flowing a fluid gypsum water solution, leveling it horizontally, and hardening it.