JPH03213304A - Manufacture of inorganic wallboard - 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 [Industrial Application Field] The present invention relates to a method for manufacturing an inorganic wallboard, and more particularly to a method for manufacturing an inorganic IT wallboard using a papermaking method.

[Conventional technology]

Traditionally, as a manufacturing method for ceramic-based inorganic wallboards using cement as the main raw material, hydraulic raw materials such as cement were dispersed in a large amount of water, and this was then milled using a circular mesh cylinder, and the resulting seed film was then felt-held. There is a well-known paper-making method in which the seed film is sequentially wound onto a large-diameter making roll, laminated to a predetermined thickness, and then cut and flattened to form a plate.

By the way, -a, inorganic boards have the property of shrinking when dry and expanding when absorbing water, and since these properties are inconvenient for use as wallboards, various attempts have been made to suppress these deformations as much as possible, and as a countermeasure - In some cases, water absorption agent 18 is added to ceramic compound raw materials to suppress water absorption.

[Problems with conventional technology]

However, in the papermaking method, since the amount of water in the dispersion of raw materials such as cement is extremely large, the amount of water repellent that must be added is extremely large, which poses the problem of not being able to produce economically. When seed films containing the water repellent are laminated, it is difficult to achieve uniform adhesion between the layers, and addition of a large amount of water repellent causes various problems such as a decrease in product strength.

[Problem to be solved by the invention]

In view of the above-mentioned problems, the present invention provides a method for manufacturing an inorganic f-wall board, which can suppress water absorption by adding a TN water agent, and can sufficiently avoid adverse effects such as a decrease in product strength due to the addition of a water repellent agent. It was made for the purpose of

(Technology that led to the solution of problem S1) That is, the method for manufacturing a non-1'i! board of the present invention, when manufacturing an inorganic wall board by a paper making method, involves placing the seed film that has been made up on a making roll in a predetermined manner. In the process of laminating up to a certain thickness, just before the final seed film with a predetermined thickness is rolled up on the above-mentioned making roll, a water repellent is uniformly sprayed on the surface of the nuclide film and the wall board is then rolled up using a conventional method. It is characterized by the fact that

[Effect]

In this invention, the papermaking method itself is exactly the same as the conventionally known method.

In this papermaking method, when the seed film is wound around a making roll and laminated to a predetermined thickness, when the final seed film is wound up, a water repellent is uniformly sprayed only on the surface of the seed film. After winding up the sheets and laminating them to a predetermined thickness, they are cut and rolled out flat, and the sheets are then manufactured using conventional methods.

Therefore, the resulting product has water repellency between the layer forming either the front or back side and the layer below it, so even if the other parts have no water repellency, the front or back side This effectively prevents water absorption.

Moreover, since the other layers do not contain a water repellent, problems such as strength reduction and delamination do not occur.

〔Example) Next, this invention will be explained in detail.

FIG. 1 shows a side view of an apparatus for carrying out the method of the invention.

Using the device 1 used for the conventional papermaking method, cement, silica raw material, aggregate, and reinforcing fibers are uniformly dispersed in water according to the conventional method to create a cement aqueous solution 2! li! This is filled into a bundt 3 and rolled up using a circular mesh cylinder 4 to form an inorganic seed layer 5 with a thickness of 1 mm, which is transferred to a felt belt 6 and wound and laminated around a making roll 7 that is in contact with the felt belt 6. A wall board with a thickness of 6 mm was manufactured.

In this step, when the seed film has been wound up to 5 cranes on the making roll 7, a water repellent 8° (stearic acid solution) is uniformly sprayed on the surface of the seed layer 5 using a shower 8, and this is applied to the making roll 7. The lamination was completed by winding it around once.

Next, the laminated plate body to a thickness of 6u is cut with a wire, peeled off from the making roll 7, and rolled out flat.
Thereafter, it was pressed and cut according to conventional methods, and then cured in an autoclave to a thickness of 5.5fi.
A test piece with a length of 900 m and a width of 450 u was obtained.

As shown in FIG. 2, the test piece was in a state in which the water repellent agent 8' was interposed only between the seed layer 5 forming the outermost layer and the next seed layer 5.

Regarding the above test piece, strength test based on JIS No. 4,
A water absorption test using a cylinder was conducted on this side with the side on which the water repellent was sprayed as the surface, and the bending strength was IO8kg/cj, and the water absorption test was as follows.
A water absorption rate of 30% was obtained after being submerged in water for 24 hours.

In addition, when the same test as above was conducted on a test piece of the same shape that was molded without spraying water-loving agent, the bending strength was 110 k.
g/ci, and for water absorption tests, submerged in water for 24 hours,
The water absorption rate was 40%, which was almost as strong as that without the addition of water repellent, and the water absorption rate was significantly improved.

(Effects) As explained above, according to the method of the present invention, an inorganic wallboard with low water absorption can be manufactured by simply spraying a water repellent on the surface of the seed layer just before final lamination of the seed layer. Moreover, since the water-repellent dowel exists only at some interfaces of the laminate, there is no decrease in the strength of the manufactured wallboard, and as a result, inorganic wallboards with excellent strength and low water absorption can be easily manufactured. be.

[Brief explanation of drawings]

FIG. 1 is a side view of an apparatus for carrying out the method of the invention, iF
! FIG. 2 shows an enlarged sectional view of a main part of a wall board manufactured by the method of the present invention.

Claims (1)

[Claims] (1) In the case of manufacturing inorganic wallboard by the papermaking method, in the process of laminating the seed film prepared by papermaking onto a making roll to a predetermined thickness, the final seed film having a predetermined thickness is wound onto the making roll. A method for producing an inorganic wallboard, which comprises uniformly spraying a water repellent onto the surface of the seed film immediately before rolling it up, and then manufacturing the wallboard by a conventional method.