JPS58172276A - Asbestos cement board and manufacture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an asbestos cement board with high mechanical strength and little directionality in strength, and a method for manufacturing the same.

Traditionally, the mechanical strength of asbestos cement boards has been improved by adding large amounts of asbestos or fibers, but wet methods have been used to improve the mechanical strength of asbestos cement boards. When mixed with asbestos cement, the fibers are manufactured with directionality per second, so there is a problem that the 1 degree of the manufactured asbestos cement board differs greatly depending on the fiber direction. When an asbestos cement board was manufactured using this method, there was a problem in that the directionality of the fibers was multidimensional, and the fibers did not provide sufficient reinforcing properties.

The present invention has been made in view of the above points, and it is an object of the present invention to provide an asbestos cement board and a method for manufacturing the same that can improve mechanical strength without being directional. .

The present invention will be explained in detail below. K manufactures asbestos cement boards.
In this case, proceed as follows. As shown in Fig. 1, an asbestos t-ment slurry (4) is placed below an endless belt-shaped paper-made felt (S) that is continuously driven.
9), scoop up the asbestos-cement slurry (4) with a paper-making roller (lol), and attach the asbestos-cement slurry (4) to the lower surface of the paper-made felt (8). 8) Dehydration and papermaking are performed to form a papermaking board (Il).
A cement slurry (6) in which asbestos and/or fiber substances, etc. are dispersed in water is sprayed on one side of a papermaking board +1), and then a fiber cloth (3) is applied to the fiber cloth (0-ru) (papermaking while off-site from a river). It is brought into close contact with the top surface of the plate (is). The fiber cloth (3) may be one in which the fibers are oriented in all directions, such as a fiber mat, fiber cloth, or nonwoven fabric having a dense lattice-like mesh. In addition, the semecitos slurry (-
), asbestos or fiber material 2#10 parts by weight,
One containing 98 to 90 parts by weight of cement and 100 to 500 parts by weight of water can be used. Next, these cement slurry (6) and fiber cloth (3) are placed on one side of the papermaking board (6), and are rolled up with a machining roller and laminated in multiple layers. Cut it into appropriate lengths to produce asbestos cement green plates as shown in Figure 2. Thereafter, this asbestos cement board (7) is deformed into a necessary shape such as a flat plate or a wave shape as shown in Figure 8, and if necessary, pressurized and then cured to obtain an asbestos cement board. .

As shown in FIG.
) are formed in multiple layers to form an asbestos cement board main body (11), and each paper layer (11 (formed by sandwiching a fiber cloth (3) between 11 and 11) is inserted to form an asbestos cement board. It can improve the bending strength and impact strength of fiber cloth (ml is soy5ta).
Since the fibers run in all directions, the asbestos cement board has no directional strength. Also.

After spraying the fiber cloth (3) with the cement slurry (6),
By immediately laying it on the paper-making board, the cement slurry (-) permeates into the upper and lower layers of the paper-making board +61 flll, and at the same time sufficiently moistens the fiber cloth (3) and spreads it onto the fiber cloth (8). The fiber cloth T11 hardens while being covered with the cement slurry (6), and the fiber cloth T11 becomes integrally fixed with each papermaking layer (1), and when the asbestos cement board is subjected to freeze-thaw action, separation between the layers occurs. Note that in the above embodiment, the IK fibers (3) sprinkled with the cement slurry (6) were laid down, but the delicate cloth (3) was spread on the paper-making board (3). After spreading the cement slurry (6) on the top surface of the fiber cloth (s), the cement slurry (6) can be scattered on the top surface of the fiber cloth (s). ), the strength between the upper and lower paper layers +1> and the strength between the fiber cloth (3) and the paper layer (1) are improved.

As described above, in the present invention, as a specific invention, the fiber cloth is sandwiched between each layer of the asbestos cement board body formed of multiple paper layers, so that the fiber cloth cannot be inserted into the asbestos cement board body. The mechanical strength of the asbestos-cement board can be improved by this method, and since the fiber cloth runs in all directions without orientation, the strength of the asbestos-cement board has no directionality.
Cement slurry was sprinkled on the lfi and fiber cloth was adhered to it, and these were laminated in multiple layers to produce asbestos cement raw boards.The asbestos cement raw boards were then cured and hardened, so that the cement slurry wet the fiber cloth. At the same time as the asbestos cement slurry cures while wrapped in fiber cloth, it permeates into each of the upper and lower paperboards, making it possible to firmly bond the paperboard layers below, thereby improving the frost damage resistance of the asbestos-cement board. It is something that can be done.

The present invention will be explained in detail below based on examples. H type mesh is aS dragon x width 5m1
(manufactured by Nittobo Co., Ltd.) and put them in close contact.
Roll up 5 layers and cut to make asbestos cement raw board ()
), and then, as shown in FIG. 8, the asbestos fibers were formed into a wave shape with the direction of the asbestos fibers perpendicular to the wave direction (in the direction of the arrow), and then cured and hardened to obtain an asbestos cement board.

Cement slurry formulation (parts by weight) Asbestos 2. - Cemecite 86.l Pigment 4.1 Slab 89. O Others Note 1) 19.0 Total 100.0 Water Note 2) 187.0 Note 1) Raw material made by crushing asbestos cement board into powder 2) Water is proportion to the total solid content (conventional example) E Glass and cement An asbestos cement board was obtained in the same manner as in the example except that the slurry was removed.

Next, the results of compressive load tests conducted on the corrugated asbestos cement plates obtained in the Examples and Conventional Examples after 14 days of age are shown in the following table. In addition, the measurement site of asbestos cement board (11) was carried out at the position shown in Fig. 4 and Fig. 1s5.

Mountain part (Arrow Island) S 8 from the B0 end at the mountain part of the asbestos cement board
The place where you entered the 77th section center.

Valley (arrow b) + valley of asbestos-cemennide board 8 from the front edge
The place where you enter the center of 77fi.

The center part (arrow C) is placed over the side edges of the two asbestos cement boards as shown in Figure 5, and the end part (arrow d) enters the center of the 877 crease from the front end. The side edges of the two sides are overlapped as shown in Figure 5, and the point is 60 degrees in the center from the front edge.

From the results shown in the above table, it can be seen that the strength of the asbestos cement board of the example was significantly improved compared to that of the conventional example.

Next, each of the above-mentioned asbestos cement boards was
A freeze-thaw resistance test was conducted according to Method A).

As shown in the table above, it can be seen that the examples have excellent frost damage resistance.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram of an embodiment of the present invention, Fig. 2 is a sectional view of an asbestos cement green board obtained by the above method, Fig. 8 is a perspective view of the asbestos cement board obtained by the above method, and Figs. 4 and 5. FIG. 2 is an explanatory diagram showing measurement locations in a load test of the asbestos cement board as described above. (1) is the papermaking layer, (2) is the asbestos cement board body, (3)
(4) is an asbestos-cement slurry, (i) is a paper-made board, (6) is a cement slurry, and ()) is an asbestos-cement raw board. Agent Patent Attorney Ishi 1) Choshichi

Claims (2)

[Claims] (1) An asbestos cement board characterized by having a fiber cloth sandwiched between each layer of an asbestos cement board main body formed of multiple paper layers. (2) Make a paper-made board by making an asbestos cement slurry, then sprinkle T-Mejitos on the top surface of the paper-made board, adhere fiber cloth, and laminate multiple layers of these to make an asbestos-cement raw board. , and then curing and hardening the green asbestos cement board.