JPS5819446B2 - Mukishitsekisobannoseizohouhou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing an inorganic laminate such as an asbestos cement board, a pulp cement board, an asbestos cement silical board, etc.

To produce inorganic laminates such as asbestos-cement boards, pulp-cement boards, and asbestos-cement silical boards using the wet method, asbestos is opened using a cotton-pulpering machine, and then the asbestos is mixed with cement, valves, mineral powder, etc. A large amount of water corresponding to 5 to 10 times the amount of these solids is added and mixed well, and the asbestos cement slurry thus obtained is made into paper using a paper making machine, for example, a circular mesh wet machine having a cylindrical frame covered with a wire mesh.

Then, the thin film of asbestos cement is filtered and dehydrated through the wire mesh, and then transferred onto the blanket that moves in contact with the cylindrical frame.

After dewatering the asbestos cement thin film transferred onto the blanket using a suction pump, it is wound onto a take-up roll until it reaches a predetermined thickness, then cut and removed from the winding machine, and the resulting raw original plate is flattened. It is rolled out and pressure-molded, the vertical and horizontal edges are cut to the specified dimensions, and then cured and hardened to make the product.

However, in the above manufacturing method, when the asbestos cement thin film is rolled up to a thickness of 10 mm or more with a winding roll,
The green original plate taken out from the take-up roll by cutting in the roll axis direction is largely warped in the asbestos cement direction perpendicular to the roll axis direction.

Therefore, when this raw original sheet is pressure-formed to form a product, warping of the product cannot be avoided.

In addition, the raw original board is obtained by winding a thin asbestos cement film onto a take-up roll in the winding direction, so when this is pressure-formed into a product, there will be differences in strength in the vertical and horizontal directions of the product. cannot be avoided.

Patent No. 62175 discloses that when an asbestos cement thick plate is produced by stacking two or more raw asbestos cement plates obtained by a papermaking method and then hardening them by compression drying, the toughness of the thick plate is In order to increase the warpage, it has been disclosed that the fibers of the green asbestos cement board are biased to each other and bonded while maintaining an appropriate angle between them, but the cause of the warpage described above is related to the direction of the asbestos fibers. The above-mentioned disclosure cannot solve the above-mentioned warping problem.

This also applies to asbestos fibers in asbestos-cement boards, which are produced using a dry method in which dry asbestos and cement mixed raw materials are spread in layers on a moving belt conveyor, water is then supplied, and compression molding is performed using pressure rolls. It is envisaged that the above-mentioned warpage problem does not occur even though the directionality occurs in the wafer.

The present invention aims to provide a manufacturing method capable of obtaining an inorganic laminate that does not have the above-mentioned drawbacks, that is, does not warp and has no difference in strength in the longitudinal and lateral directions. The cement slurry is made into an asbestos-cement thin film using a circular mesh paper making machine, and then this asbestos-cement thin film is wound onto a take-up roll, cut in the axial direction of the roll, and removed from the take-up roll to form a raw original plate. The method is characterized in that a plurality of raw original sheets obtained in this manner are stacked in alternating vertical and horizontal directions, and then pressure-formed.

Hereinafter, the present invention will be explained in detail based on the drawings.

As shown in FIG. 1, asbestos 1 is ruled by a ruling machine 1a and then fed into a mixer 2.

At this time, cement 3, pulp powder, and mineral powder 4 are simultaneously introduced into mixer 2 and mixed.

A large amount of water 5, which is 5 to 10 times the amount, is added to the asbestos-cement mixture thus obtained, mixed in a mixer 6, and further mixed in a chest 6.
Mix thoroughly in step a to obtain asbestos cement slurry 7.

Next, this asbestos cement slurry 7 is transferred to a circular mesh paper making machine 8.
put it in.

Then, the 0.5 mm
The asbestos-cement slurry was dehydrated through a wire mesh (not shown) of about 100 mL, and then cut into an asbestos-cement thin film.

Next, this asbestos cement thin film is transferred to an endless blanket belt 9 that moves in contact with the cylindrical frame 8a, and after being dewatered by a suction pump 9a during the movement of the belt 9, it is placed in a groove of a predetermined thickness on a winding roll 10. Wind it up.

Next, the asbestos cement layer of a predetermined thickness wound around the winding roll 10 is cut in the roll axis direction and taken out from the winding roll 10 to form a raw original plate 11°.

This raw original board 11 is obtained by winding an asbestos cement thin film onto a take-up roll 10 in the direction in which the asbestos cement thin film is taken out in the paper making machine 8, so as shown in FIG. 2, it is cut 12 in the roll axis direction. Winding row.

As shown in FIG. 3, the green original plate 11 obtained by removing it from the mold 10 and rolling it flat is warped in the cutting direction (arrow a) of the asbestos cement thin film that constitutes the green original plate 11. It cannot be avoided.

However, it is unavoidable that the strength of this raw original plate 11 differs between the paper cutting direction indicated by arrow a and the direction perpendicular to this direction.

Therefore, in the present invention, as shown in FIG. 4, these raw original plates 11 are stacked with the second direction a of the raw original plates 11 alternately vertically and horizontally as shown in FIG. 5, and then pressurized. It is molded and cured into a product.

In the present invention, in order to improve the adhesion strength between each green original plate, cement water having a composition as shown in the following formula and (B) is applied to the adhesion surface of each raw original plate.

(All amounts are in parts by weight) Cement
0.01~3 parts asbestos 0.01~3
Part water: 100-1000 parts (B)
Cement 0.01-3 parts Asbestos
0.01-3 parts emulsion adhesive 0.01-3 parts water
100 to 1000 parts Cement water having the above-mentioned composition can be obtained as is or by diluting condensate water or paint waste during papermaking, and there is no need to prepare or purchase it.

- Since the present invention has been explained in detail above, an asbestos cement board obtained by the method of the present invention,
In inorganic laminates such as pulp cement boards and asbestos-cement silica boards, the product does not cause damage and there is no risk of delamination.

Moreover, there is almost no difference between the strength in the longitudinal direction and the strength in the lateral direction of the product.

A shear test of the product obtained by the method of the present invention resulted in material failure.

In addition, the tensile test result also showed material failure, and the strength was 20.
It was a matter of concern.

In the bending strength test, the strength was 10 times higher, and there was no delamination and material failure.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram showing the steps up to the production of asbestos cement raw plates in the present invention, and Figs. 2 to 5 show the asbestos cement raw plates obtained in the process of Fig. 1 being laminated and pressure-molded. It is an explanatory diagram showing a process of doing. 1 is asbestos, 2 is a mixer, 3 is cement, 4 is pulp powder, 5 is water, 6 is a mixer, 6a is a chest, 7 is asbestos cement slurry, 8 is a circular mesh paper making machine, 8a is a cylindrical frame, 9 is an endless blanket belt, 10 is a winding rotor, 11 is an asbestos cement raw plate, and a is the direction in which the asbestos cement thin film constituting the raw raw plate 11 is taken.

Claims (1)

[Claims] 1. The asbestos-cement slurry is made into an asbestos-cement thin film using a round steel paper making machine, and then this asbestos-cement thin film is wound onto a take-up roll, cut in the axial direction of the roll, and removed from the take-up roll. A method for producing an inorganic laminate, which comprises: preparing a green original plate, stacking the thus obtained plurality of raw original plates with their paper cutting directions alternating vertically and horizontally, and then press-forming them.