JPH06335908A - Method for manufacturing plate-shaped building element - Google Patents

Abstract

(57) [Summary] [Purpose] To improve product quality by eliminating delamination of green board, and reduce the amount of dehydrated slurry to reduce equipment costs. [Structure] A sheet 2 having water permeability that circulates in a certain direction
On top of that, the solid content of the lightweight aggregate and reinforcing fiber is 2
0-45% of the slurry 1 is supplied in the form of a single layer plate, and the slurry 1 is decompressed and dehydrated by suction means 11 provided on the lower surface of the sheet 2 to form a continuous plate-like green plate 3. Is cut into a predetermined size, and this is further pressed and dehydrated, and the dehydrated green plate 3 is cured to manufacture a plate-shaped building element.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a plate-shaped building element.

[0002]

2. Description of the Related Art Conventionally, as a method of manufacturing plate-shaped building elements such as outer wall boards and roof tiles, there is a winding method.
In this method, a thin slurry is attached to a felt that advances in a certain direction by papermaking, etc., and this thin slurry is wound in layers in a making roll until a predetermined number of layers are obtained, and then the layered slurry is cut in the width direction. Then, a green plate is formed by peeling the green plate from the making roll, and the green plate is cut into a predetermined size and then cured to obtain a plate material having a constant shape (for example, JP-A-4-4790).
(See Japanese Patent Publication No. 5).

[0003]

However, in the method in which the slurry is wound around the making roll in layers, peeling is liable to occur between the layers, and therefore the strength is often not so high despite the large plate thickness. There is a problem that there is a limit to the plate thickness that can be produced due to the difference in the inner and outer diameters when winding.

Further, when the raw plate is cut and further dehydrated by pressing with a mold for patterning or the like, the water squeezed during the pressing runs between the layers of the raw plate, which causes the above-mentioned delamination problem. Especially close up. Further, when the slurry is thinly adhered to the felt by the papermaking, the solid content concentration of the slurry must be generally lowered to about 10 to 15%, so that a large amount of water is generated during the dehydration process, which is a large problem. Effluent treatment equipment was needed.

In view of such circumstances, it is an object of the present invention to eliminate the delamination of a green plate to improve the quality of the product and to reduce the dehydration amount of the slurry to reduce the equipment cost.

[0006]

[Means for Solving the Problems] In order to achieve the above object,
The technical means taken by the present invention is to supply a slurry containing a lightweight aggregate and a reinforcing fiber and having a solid content concentration of 20 to 45% in a single-layer plate shape on a water-permeable sheet that circulates in a certain direction. , This slurry is decompressed and dehydrated by suction means provided on the lower surface of the sheet to form a continuous plate-shaped raw plate, and the raw plate is cut into a predetermined size and press-dehydrated to obtain a dehydrated raw plate. It is a point to obtain plate-shaped building elements by curing.

[0007]

In the present invention, since the slurry is supplied in the form of a single layer plate on the sheet, delamination does not occur in the green plate thus formed. Further, since the solid content of the slurry supplied onto the sheet is as high as 20 to 45%, the amount of dehydration by the suction means is smaller than that in the conventional manufacturing method.

The solid content concentration of the slurry is 20-45.
%, The weight aggregate is floated below 20% and unevenly distributed in the thickness direction of the slurry, so that the plane tensile strength of the product is extremely reduced. This is because the slurry cannot be mixed and kneaded so that the reinforcing fiber becomes uniform because the concentration is too high.

[0009]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a facility for manufacturing plate-shaped building elements in which the method according to the invention is carried out. In the figure, this manufacturing equipment is a raw plate manufacturing apparatus 4 for manufacturing a continuous plate-shaped raw plate 3 by dehydrating the slurry 1 from the lower surface of the sheet 2 under reduced pressure, and this apparatus 4.
A cutting conveyor 5 arranged on the exit side (right side of FIG. 1) of
A separating conveyor 7 for forming intervals between the raw plate pieces 6 formed by cutting the raw plate 3 on the conveyor 5, and a press device 8 for pressing and dehydrating the raw plate pieces 6 with upper and lower molds. It has and.

The green plate manufacturing apparatus 4 comprises a water-permeable annular sheet 2 below a slurry supply hopper 9.
The sheet 2 is circulated by a plurality of rollers 10 in the arrow direction at a constant speed. Inside the annular loop of the seat 2, a large number of suction boxes 11 for depressurizing and dehydrating the slurry 1 from the lower surface of the seat 2 are provided, and each suction box 11 is the outer circumference of a chain wound around a pair of front and rear sprockets 12. The seat 2 is fixed to the seat 2, and runs in synchronization with the seat 2 in a state of being in close contact with the lower surface of the seat 2.

A suction rail 13 for decompressing the inside of the box 11 is installed in an annular loop composed of a large number of suction boxes 11, and the rail 1 is also provided.
A press roll 14 is provided above 2 to pressurize the upper surface of the slurry 1 during depressurization dehydration. The cutting conveyor 5 arranged on the output side of the sheet 3 is designed to move at the same speed as the sheet 3 by the drive motor 15, and above the cutting conveyor 5 the raw plate manufacturing apparatus 4 supplies raw material. A cutting device 16 is provided which cuts the plate 3 along its width direction and thereby forms a continuous plate-shaped green plate 3 into a green plate piece 6 having a constant length.

As shown in FIGS. 1 and 2, the cutting device 16 has rails 17 arranged on the side of the cutting conveyor 5 along the direction in which the raw plate 3 advances, and the raw plate 3 moves on the rail 17. The long traveling body 18 is provided so as to be capable of traveling in synchronization with the traveling body 18, and the traveling body 18 is installed parallel to the width direction of the green plate 3. The traveling body 18 has a cutting head 19 for the green plate 3.
Is slidably attached, and this allows the cutting head 19 to move in the width direction of the green plate 3.
In this embodiment, as the cutting head 19 of the green plate 3, a cutter nozzle which jets a sufficiently thin jet water flow downward is adopted.

A control box 20 for controlling the operations of the traveling body 18 and the cutting head 19 is provided on the side of the rail 17. As shown in FIG. 2, this control box 20
Is a program for causing the running body 18 to run at the same speed V1 as the cutting conveyor 5 and for the cutting head 19 to run at a constant speed V2 from one end to the other end in the width direction of the green plate 3 while the running body 18 is running. As a result, the continuous plate-shaped green plate 3 from the sheet 2 is formed into a green plate piece 6 having a constant length.

On the output side of the cutting conveyor 5, a separating conveyor 7 is provided.
The separating conveyor 7 advances at a speed higher than that of the sheet 3 and the cutting conveyor 5 by a variable speed drive motor 21. Therefore, the raw plate 3 (raw plate piece 6) cut by the cutting conveyor 5 is conveyed by the separating conveyor 7 at a speed higher than the conveying speed V1 of the cutting conveyor 5, and the raw plate pieces 6 are adjacent to each other. It travels on the cutting conveyor 5 with a certain distance from the raw plate piece 6.

Further on the exit side of the separating conveyor 7, there is provided a taking-out conveyor 22 into which the raw plate pieces 6 separated by the separating conveyor 7 are carried in at regular intervals, and above the taking-out conveyor 22. A take-out device 23 for taking out the green plate piece 6 to the press device 8 outside the line is provided. The take-out device 23 includes a lifter 24 provided above the take-out conveyor 22 so as to be movable up and down with respect to the conveyer 22, and a take-out head 25 fixed to a lower end of the lifter 24. The take-out head 25 is a hollow body that is wider than the green plate piece 6 and has a large number of suction ports provided on the lower surface, and the inside of the take-out head 25 is decompressed by suction means (Nash pump or the like) not shown.

Therefore, when the lifter 24 is lowered, the take-out head 25 sticks to the raw plate piece 6 without disturbing it, and then the lifter 24 is raised to raise the raw plate piece 6.
Is carried out of the line, the raw plate pieces 6 are carried to the pressing device 8. Then, each raw plate piece 6 is pressed and dehydrated by the upper and lower molds of the press device 8, and the surface of the raw plate piece 6 is deeply patterned, or the raw plate piece 6 is relatively small such as a roof tile. It is subdivided into architectural elements. After that, the green board piece 6 is hardened through autoclave curing or the like to form a plate-shaped building element having a constant shape.

Next, an experimental example will be described. (Experimental Example 1) Slurry 1 mixed in the following weight ratio was fed onto sheet 2 of raw plate manufacturing apparatus 4 as a single-layer plate having a plate thickness of about 15 mm, and this slurry 1 was supplied to suction box 1
After dehydration under a reduced pressure of -550 to 600 mmHg at 1,
The raw plate 3 thus obtained was cut into a predetermined size, and was further press-dehydrated by the press device 8. The press-dehydrated raw plate piece 6 was subjected to autoclave curing to prepare a plate material having a constant shape.

Solid content blending Cement 40% Quartz sand 40% Perlite 13% Pulp 7% Solid content concentration 30% Here, the solid content concentration means the weight percentage of the solid content relative to the entire slurry 1.

As a result of this experiment, the solid content concentration of the green plate 3 after decompression dehydration was about 60 to 65%. The solid content concentration of the green plate piece 6 after press dehydration was about 70 to 75%. As described above, the solid content concentration is largely different before and after the press dehydration because in this example, the slurry 1 having a solid content concentration of 30% is dehydrated under reduced pressure at a high reduced pressure of −550 to 600 mmHg. Raw plate 3
This is considered to be because water can be formed in the thickness direction, and this water has the effect of facilitating press dehydration performed thereafter. Therefore, in this case, the problem of delamination due to press dehydration does not occur. The plane tensile strength of the resulting plate material is 20 kg / c.
It was m ² . (Experimental example 2) Slurry 1 blended in the following weight ratio was supplied onto sheet 2 of green plate manufacturing apparatus 4, and thereafter, a plate material having a constant shape was prepared under the same conditions as in experimental example 1.

Solid content mixture Cement 38% Quartz sand 39% Perlite 13% Pulp 10% Solid content concentration 30% As a result, the solid content concentration of the raw plate 3 after dehydration under reduced pressure is 55-6.
It was about 0%. Also, raw plate piece 6 after press dehydration
The solid content concentration of was about 65 to 70%.

The plane tensile strength of the plate thus prepared is 15 k.
It was g / cm ² . (Experimental Example 3) Slurry 1 was prepared by setting the solid content concentration to less than 20% in the solid content blending of Experimental Example 1 and Experimental Example 2,
This slurry 1 was supplied onto the sheet 2 in the form of a single-layer plate having a plate thickness of 15 mm, and a plate material having a constant shape was prepared under the same conditions as in Experimental Example 1.

As a result, the bending strength of the resulting plate material is 5 kg.
/ Cm ^2, the strength is less Observation of the cross section by cutting the plate material, the light-weight aggregate (pearlite) is unevenly distributed on the upper side of the plate thickness is detected. It is considered that this is because, when the solid content concentration is less than 20% and the single layer is supplied on the sheet 2, the concentration is too low and pearlite floats. (Experimental Example 4) On the other hand, in the solid content blending of Experimental Example 1 and Experimental Example 2, it was attempted to prepare Slurry 1 with a solid content concentration exceeding 45%. In this case, however, the solid content concentration was too high and the reinforcing fiber was used. Slurry 1 could not be mixed and kneaded so that a certain pulp became uniform.

[0023]

As described above, according to the present invention,
Since delamination does not occur on the green plate, the quality of the product can be greatly improved, and the amount of slurry dehydrated by the suction means can be made smaller than before, so the wastewater treatment facility is simple and the building element concerned. It is possible to reduce the equipment cost for manufacturing.

[Brief description of drawings]

FIG. 1 is a side view of a facility for manufacturing plate-shaped building elements.

FIG. 2 is a plan view of a cutting device and a separating conveyor.

[Explanation of symbols]

 1 Slurry 2 Sheet 3 Raw Plate 11 Suction Means (Suction Box)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinobu Iida 1-247 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka Kubota Corporation

Claims (1)

[Claims] 1. A single-layer plate-like slurry (1) containing a lightweight aggregate and reinforcing fibers and having a solid content concentration of 20 to 45% is provided on a water-permeable sheet (2) which circulates in a certain direction. Then, the slurry (1) is decompressed and dehydrated by the suction means (11) provided on the lower surface of the sheet (2) to form a continuous plate-shaped green plate (3), and the green plate (3) is set to a predetermined size. A method for manufacturing a plate-shaped building element, which comprises cutting and further press-dewatering it, and curing the dehydrated green board (3) to obtain a plate-shaped building element.