JPH08197520A - Manufacture of gypsum building material having no bubble on surface - Google Patents

Abstract

PURPOSE: To provide a method for manufacture of a gypsum building material without any bubble on a surface and near the surface. CONSTITUTION: In a method for manufacture of a gypsum building material wherein a horizontally placed body belt 1 is driven, gypsum slurry 6 is continuously fed from a gypsum slurry feed part extended from a gypsum slurry feeder 9 on the body belt, and the gypsum slurry 6 is smoothed with a forming component to form a gypsum layer, and vibration is added to a forming spatula 3 being the forming component. Besides, vibration may be added to any position of the body belt, the gypsum slurry feed part, or the fed gypsum slurry part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a gypsum building material, and more particularly to a method for producing a gypsum building material capable of reducing bubbles existing near the surface layer of a gypsum layer.

[0002]

2. Description of the Related Art Conventionally, gypsum building materials have been used for a wide range of purposes such as partition walls for hotels, condominiums, office buildings, schools, pipe spaces, fireproof partition walls such as elevator shafts, etc. Demand is increasing year by year as a lightweight panel with excellent workability. Furthermore, in recent years, high-rise buildings and condominiums have been actively constructed, and there is an increasing tendency toward high-rise and intelligent construction. Therefore, gypsum-based building materials made of non-combustible materials for fire prevention and disaster prevention have attracted attention. Conventionally, when manufacturing such a gypsum building material, for example, a gypsum board, a series of flow work method is usually used, which is a gypsum slurry by kneading hemihydrate gypsum, water, a setting regulator, a thickener, etc. with a mixer. Is formed, the gypsum slurry is cast on a belt conveyor to be molded, and then cured and dried to produce a gypsum board. Figure 6
As in, in the manufacturing process of such gypsum,
When the molding spatula 3 is provided on the belt conveyor 1 and the slurry 6 is supplied from the slurry supply device 9 onto the belt conveyor 1, a gypsum building material that is molded by the molding spatula 3 and has a flat surface is obtained. As shown in FIGS. 7 to 8, the molding spatula 3 has a smooth surface to form a smooth surface.
Its tip is kept horizontal over a length of a few cm. In addition, airtight gypsum board with relatively few bubbles on the surface,
The gypsum board is produced by laminating a gypsum slurry having no bubbles on the surface of the gypsum board (Japanese Patent Laid-Open No. 63-242503), and in order to produce a gypsum building material having a dense gypsum layer having no bubbles on the surface, Conventionally, an antifoaming agent has been added to the gypsum slurry forming the surface gypsum layer.

[0003]

However, in the conventional method for producing a plaster building material as described above, air bubbles are often present on the surface of the applied gypsum slurry or in the vicinity of the surface, and therefore the air bubbles are present on the surface of the gypsum slurry. In that case, the hardened surface can be ground to form a bubble-free surface, but if bubbles are present near the surface, the bubbles will appear due to grinding and the bubbles inside the slurry cannot be removed. Therefore, there is a problem that the plaster building material product becomes defective and the commercial value is reduced. Further, if large bubbles are present on the surface of the gypsum slurry or in the vicinity of the surface, the strength of the gypsum building material itself becomes weak, which is not only a problem, but also unfavorable in appearance as a product.

Therefore, as a result of various investigations by the present inventors to solve the problems of the method for producing a gypsum building material as described above, the body belt, the gypsum slurry supply section, and the supplied gypsum slurry section during the production process. Further, it has been found that an excellent gypsum building material having no bubbles on the surface of the gypsum slurry or in the vicinity of the surface can be obtained by applying a vibration at the time of forming the gypsum board at any part of the molding spatula, and completed the present invention. Therefore, the problem to be solved by the present invention is to provide a method for producing a plaster building material which has no bubbles on the surface or in the vicinity of the surface and is preferable in appearance.

[0005]

The above object of the present invention can be achieved by each of the following inventions.

(1) A horizontally installed body belt is driven, and gypsum slurry is continuously supplied onto the body belt from a gypsum slurry supply unit extending from a gypsum slurry supply device, and the gypsum slurry is evenly distributed by a molding member. In the method for producing a gypsum building material for forming a gypsum layer, the method for producing a gypsum building material, characterized in that the body belt, the gypsum slurry supply section, the gypsum slurry section supplied or a vibration is applied to any part of the molding member. Method. (2) The method for producing a gypsum building material as described in the above item 1, wherein the portion to which the vibration is applied is the body belt and is a portion located between the gypsum slurry supply outlet and the forming spatula. (3) The method for producing a gypsum building material as described in the above item 1 or 2, wherein the point to which vibration is applied is the gypsum slurry supply section outlet. (4) The method for producing a gypsum building material according to any one of the above items 1 to 3, wherein the part to which vibration is applied is the gypsum slurry part supplied. (5) The method for producing a gypsum building material according to any one of the above items 1 to 4, wherein the portion to which vibration is applied is a molded member.

The present invention will be described in more detail below. In the method for producing a gypsum building material according to the present invention, a horizontally installed body belt is driven, and a gypsum slurry supply section extending from a gypsum slurry supply device extends onto the body belt. In a method for producing a gypsum building material in which gypsum slurry is continuously supplied, and the gypsum slurry is leveled with a molding member to form a gypsum layer, the body belt, the gypsum slurry supply section, the supplied gypsum slurry section or the molding member It is characterized in that vibration is applied to any part, which makes it possible to manufacture a plaster building material that is pleasing in appearance and has no bubbles on the surface or in the vicinity of the surface, and thus a defective product as in the past can be obtained. Can be prevented.

Further, in the present invention, the body belt, the gypsum slurry supply portion, the supplied gypsum slurry portion or the molding member is suitable as the portion to be vibrated. Among these, a roller, a spatula, or the like is used as the molding member, but a spatula is preferable. Further, in the case of molding with a roller, the vibrator is preferably embedded in the slurry. In the present invention, it is preferable to use a vibrator as the vibration source. The vibrator has a vibration range of 30 to 200 Hz and an amplitude of 0.2 to 1.0 mm, preferably a vibration range of 8
The amplitude is 0 to 200 Hz and the amplitude is 0.4 to 0.8 mm. In the case of a body belt, this vibrator is attached to the bottom of the belt. In the case of the gypsum slurry supply unit, it can be installed at each part of the pipe extending from the gypsum slurry supply device or at the pipe outlet, and the vibrator can be installed at the forming spatula. Furthermore, it is also possible to put in the gypsum slurry part supplied, that is, the slurry. The gypsum building material used in the production method of the present invention mainly includes those in which both surfaces of the lightweight layer containing bubbles are covered with a dense layer having no bubbles, but the material of the gypsum layer and the aerated gypsum layer constituting the gypsum building material is Although not particularly limited, any of hemihydrate gypsum, α-type and β-type can be used, but β-type hemihydrate gypsum prepared by firing dihydrate gypsum is preferable.

[0009]

In the method for producing a plaster building material of the present invention, the body belt in the process for producing the gypsum building material, the gypsum slurry supply section,
At any part of the supplied gypsum slurry part or the molding member, by vibrating at the time of forming the gypsum board, the gypsum slurry vibrates and bubbles existing in the slurry float up and are removed from the surface. It Therefore, it is possible to obtain a plaster building material which is preferable in appearance and has no bubbles on the surface or in the vicinity of the surface.

[0010]

EXAMPLES The present invention will be described in more detail below with reference to examples of the method for producing a light-weight gypsum cured product of the present invention, but the present invention is not limited to these examples.

Example 1 FIG. 1 is a perspective view showing a part of the manufacturing process of the gypsum building material of the present invention. In FIG. 1, 1 is a body belt,
A support frame 2 is provided on the body belt 1, and a molding spatula 3 is attached to the support frame 2. This forming spatula 3 has a width a of 6
It is 0 cm, and the tip portion b thereof is kept horizontal at 5 cm. A vibrator 4 was installed in the center of the support frame 2. The vibration range of the vibrator 4 is 180 Hz.
And the amplitude thereof was 0.5 mm. The gypsum slurry 6 is supplied from the gypsum slurry supply device 9 through the pipe 7 to the body belt 1 from the slurry outlet 8. At this time, the gypsum slurry 6 was vibrated by the vibrator 4, and the bubbles in the gypsum slurry were floated up to the surface of the slurry and removed, and a plaster building material having a pleasing appearance and having no bubbles on or near the surface was obtained.

FIG. 2 is a perspective view showing another embodiment of the present invention, in which the vibrator 4 is installed at the outlet 8 at the tip of the pipe 7 connected to the gypsum slurry supply device 9. As a result, the bubbles are removed as in FIG. FIG. 3 is a perspective view showing still another embodiment, in which the vibrator 4 is installed in the pipe 7 connected to the gypsum slurry supply device 9. Furthermore, FIG. 4 is a perspective view showing another embodiment, and the vibrator 4 is installed in the gypsum slurry. By installing the vibrator 4 in each of such places, the bubbles rise to the surface of the slurry and are removed, and a plaster building material having a favorable appearance with no bubbles on the surface or in the vicinity of the surface can be obtained. Similarly, when a gypsum building material in which both surfaces of a light-weight layer containing bubbles were covered with a dense layer was manufactured, a plaster building material having no bubbles on the surface and having a preferable appearance was obtained.

Embodiment 2 FIG. 2 is a perspective view showing another embodiment of the present invention, except that the vibrator 4 described in Embodiment 1 is replaced with the position shown in FIG. The manufacturing process of the present invention was performed in the same manner as in. In FIG. 2, the vibrator 4 is installed at the outlet 8 at the tip of the pipe 7 connected to the gypsum slurry supply device 9. As a result, the bubbles are removed as in FIG.

Embodiment 3 FIG. 3 is a perspective view showing another embodiment of the present invention, except that the vibrator 4 described in Embodiment 1 is replaced with the position shown in FIG. The manufacturing process of the present invention was performed in the same manner as in. In FIG. 3, the vibrator 4 is installed in the pipe 7 connected to the gypsum slurry supply device 9. As a result, the bubbles are removed as in FIG.

Fourth Embodiment FIG. 4 is a perspective view showing another embodiment of the present invention, except that the vibrator 4 described in the first embodiment is replaced with the position shown in FIG. The manufacturing process of the present invention was performed in the same manner as in. In FIG. 4, the vibrator 4 is embedded in the gypsum slurry 6. As a result, the bubbles are removed as in FIG.

Embodiment 5 FIG. 5 is a cross-sectional view showing another embodiment of the present invention, except that the vibrator 4 described in Embodiment 1 is replaced with the position shown in FIG. The manufacturing process of the present invention was performed in the same manner as in. In FIG. 5, the vibrator 4 is installed so as to intermittently contact the body belt 1. As a result, the bubbles are removed as in FIG. This installation position is preferably near the molding spatula.

Example 6 The manufacturing process of the present invention was performed in the same manner as in Example 4 except that a roller was used instead of the molding spatula 3 described in Example 4. As a result, the bubbles are removed as in FIG.

[0018]

According to the method for producing a plaster building material of the present invention, since a vibrator is provided in a part of the production process of the plaster building material,
This vibration has the excellent effect of removing bubbles, and thus obtaining a plaster building material having a preferable appearance with no bubbles on the surface or in the vicinity of the surface.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a manufacturing process of a gypsum building material of the present invention.

FIG. 2 is a perspective view showing a part of a manufacturing process of another gypsum building material of the present invention.

FIG. 3 is a perspective view showing a part of a manufacturing process of still another gypsum building material of the present invention.

FIG. 4 is a perspective view showing a part of a manufacturing process of still another gypsum building material of the present invention.

FIG. 5 is a cross-sectional view showing a part of the manufacturing process of still another gypsum building material of the present invention.

FIG. 6 is a perspective view showing a manufacturing process of a conventional gypsum building material.

FIG. 7 is a perspective view showing a molding spatula used in a manufacturing process of a conventional gypsum building material.

8 is a cross-sectional view showing the molding spatula of FIG.

[Explanation of symbols]

1 Body Belt 6 Gypsum Slurry 2 Support Frame 7 Pipe 3 Molding Spatula 8 Slurry Outlet 4 Vibrator 9 Slurry Supply Device 5 Gypsum Building Material

Claims (5)

[Claims] 1. A horizontally installed body belt is driven, and gypsum slurry is continuously supplied onto the body belt from a gypsum slurry supply unit extending from a gypsum slurry supply device, and the gypsum slurry is leveled by a molding member. In the method for producing a gypsum building material for forming a gypsum layer, a method for producing a gypsum building material, characterized in that vibration is applied to any part of the body belt, the gypsum slurry supply section, the supplied gypsum slurry section or the molding member. . 2. The method for producing a gypsum building material according to claim 1, wherein the portion to which the vibration is applied is a body belt and is a portion located between the gypsum slurry supply outlet and the forming spatula. 3. The method for producing a gypsum building material according to claim 1, wherein the point of vibration is the gypsum slurry supply section outlet. 4. The method for producing a gypsum building material according to claim 1, wherein the vibrating point is the gypsum slurry portion supplied. 5. The method for producing a gypsum building material according to claim 1, wherein the portion to which the vibration is applied is a molded member.