JP2002144315A - Method for manufacturing mineral plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a sink mark (recess) from being made on a rear surface of a press molding. SOLUTION: A method for manufacturing a mineral plate comprises the steps of blowing the air to a closed space (5) generated between a mold (4) of a press molding machine (2) and a mineral crude plate (1) when the plate (1) is press molded by the machine (2) to shape a rugged pattern (3) to manufacture the mineral plate, and enhancing a pressure of the air of the space (5) to press mold the mineral plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an inorganic plate. More specifically, the invention of this application relates to a method for producing an inorganic plate that does not cause sink marks (dents) on the back surface of a press-formed product.

[0002]

2. Description of the Related Art Conventionally, when an inorganic plate used as a building plate such as an outer wall material of a house or a ceiling material is manufactured, for example, as shown in FIG. 1) is press-formed by a press-forming machine (2) to form an uneven pattern (3), and after curing and curing according to a conventional method, a surface decorative finish is applied to produce an inorganic plate.

[0003]

However, in the above-mentioned conventional method for producing an inorganic plate, as shown in FIG. 2, an inorganic raw plate (1) is press-formed by a press-forming machine (2) to form an uneven surface. When shaping the pattern (3), as shown in FIG. 2 (a), an uneven pattern (3) for shaping the mold (4) is brought into contact with the surface of the inorganic raw plate (1). As shown in (b), when the convex portion of the mold (4) is pressed and press-formed, the inorganic raw plate (1) corresponding to the concave portion of the mold (4) is formed.
The portion is lifted into a closed space (5) created between the mold (4) of the press forming machine (2) and the inorganic raw plate (1) as shown in FIG. ) The back surface rises, thereby causing a sink (hollow) (6) on the back surface of the inorganic raw plate (1) and further sink once (hollow).
When (6) occurs, since the inorganic raw plate (1) is closed and remains on the back surface even if the press molding is continued afterwards, it remains as a sink (dent) (6) even in the final molded state, and the press is formed. There is a problem that sinks (dents) occur on the back surface of the molded product.

[0004] In FIG. 2, (7) is a vacuum deaeration hole formed in a mold (4) of a press molding machine (2), and (8) is an inorganic raw plate (1) placed thereon. This is a tray that is supplied to a press forming machine (2) and press-formed.

[0005] The invention of this application has been made in view of the circumstances described above, and solves the above-mentioned problems and provides a method of manufacturing an inorganic plate which is free from the possibility of causing sink marks (dents) on the back of a press-formed product. It is intended to provide.

[0006]

Means for Solving the Problems The invention of this application has been made to solve the above-mentioned problems, and the first invention is to provide an uneven raw material by press-forming an inorganic raw plate with a press-forming machine. When shaping a pattern to produce an inorganic plate,
Provided is a method for producing an inorganic plate, characterized in that air is blown into a closed space generated between a mold of a press forming machine and an inorganic raw plate, and press forming is performed by increasing the pressure of air in the closed space.

[0007] The second invention provides a method for producing the above-mentioned inorganic plate, in which the pressure of air in the closed space is increased to 0.05 MPa or more.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention of this application has the features as described above, and embodiments thereof will be described below.

FIG. 1 is a sectional view of an essential part illustrating a press-formed state of the invention of the present application.
(B) shows the final molding state. In the first invention of this application, for example, as illustrated in FIG. 1, an inorganic raw plate (1) as a work is press-formed by a press-forming machine (2) and a desired pattern such as a joint pattern or a stripe pattern is formed. The concave and convex pattern (3) is shaped and cured and cured in accordance with a conventional method. Then, when the surface is subjected to a decorative finish and the inorganic plate is manufactured, the mold (4) of the press molding machine (2) and the inorganic raw material are used. The present invention relates to a method for producing an inorganic plate, characterized in that air is blown into a closed space (5) generated between plates (1), and the pressure of the air in the closed space (5) is increased to perform press molding.

In the invention of the present application, when the inorganic raw plate (1) is manufactured, for example, a hydraulic material such as cement, pulp, rock wool, vinylon fiber,
A hydraulic raw material comprising a reinforcing fiber such as a polypropylene fiber as a main component and, if necessary, an inorganic filler such as silica sand, silica, or pearlite, is added to a desired solid content concentration (20 to
(65% by weight) by extruding a hydraulically kneaded product obtained by mixing with a required amount of water using an extruder.

The inorganic raw plate (1) manufactured as described above is cut into a desired size, if necessary, placed on a tray (8), and pressed into a press forming machine (2). , And press-formed while being supported by the tray (8).

When air is blown into the closed space (5), for example, a vacuum degassing hole (7) formed in a mold (4) of a press molding machine (2) is used to close the closed space (5). 5)
The air may be blown into the closed space (5) by using an air blow hole (not shown) formed in the mold (4) separately from the vacuum deaeration hole (7).

As described above, in the first invention of this application, air is blown into the closed space (5) created between the mold (4) of the press molding machine (2) and the inorganic raw plate (1).
Since the pressurization is performed by increasing the pressure of the air in the closed space (5), as shown in FIG.
The mold (4) is brought into contact with the surface of, and as shown in FIG.
When the convex portion of the mold (4) is pressed and press-formed, the portion corresponding to the concave portion of the mold (4) is lifted and the back surface of the inorganic raw plate (1) is prevented from being lifted by the pressing force of air. There is no danger of sink marks (dents) on the back of the press-formed product.

The second invention of this application is, for example, a closed space formed between a mold (4) of a press molding machine (2) and an inorganic raw plate (1) in the first invention exemplified in FIG. When air is blown into (5) to increase the pressure of the air in the closed space (5), the pressure of the air in the closed space (5) is reduced to 0.
The present invention relates to a method for producing an inorganic plate, wherein press molding is performed at a pressure of at least 05 MPa.

As described above, in the second invention of this application, the pressure of the air in the closed space (5) is increased to 0.05 MPa or more and press-molding is performed. 1) The lifting of the back surface can be reliably and efficiently prevented, and there is no danger of sink marks (dents) on the back surface of the press-formed product.

In the invention of this application, the composition of the inorganic raw plate, the press molding method and molding conditions, the method of blowing air, and the like may be selected and determined as appropriate according to the purpose and application. .

The present invention will be described in more detail with reference to the following examples.

[0018]

(Example) FIG. 1 shows a cement-based green plate obtained by extrusion-molding a cement-based kneaded product obtained by mixing cement, pulp, and vinylon fiber with water by an extrusion molding machine according to a conventional method. As described above, air is blown into the closed space (5) from the vacuum deaeration hole (7) formed in the mold (4) of the press molding machine (2), and the pressure of the air in the closed space (5) is reduced to 0. When a press-formed product having a width of 1 m, a length of 3 m, and a thickness of 15 to 35 mm was produced by press-molding at a pressure of 05 MPa, no sink marks (dents) were observed on the back surface of the press-formed product. (Comparative Example) In the above example, air was not blown into the closed space (5) from the vacuum degassing hole (7), and the other was press-formed according to the example to produce a press-formed product. ), Sink marks (recesses) were observed on the back surface of the press-formed product corresponding to the concave portions [the convex portions of the uneven pattern (3)].

[0019]

As described in detail above, according to the invention of this application, a beautiful inorganic plate can be manufactured without the risk of sink marks (dents) on the back surface of the press-formed product.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part illustrating a press forming state of the invention of the present application, wherein (a) shows a state before forming and (b) shows a final forming state.

FIG. 2 is a cross-sectional view of a main part illustrating a conventional press molding state, in which (a) shows a state before molding and (b) shows a final molding state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inorganic raw board 2 Press molding machine 3 Concavo-convex pattern 4 Mold 5 Closed space 6 Sink (hollow) 7 Vacuum deaeration hole 8 Tray

Claims (2)

[Claims] 1. In producing an inorganic plate by press-forming an inorganic raw plate with a press forming machine to form an uneven pattern, air is blown into a closed space generated between a mold of the press forming machine and the inorganic raw plate. And press forming by increasing the pressure of air in the closed space. 2. The pressure of air in a closed space is 0.05 MPa.
The method for producing an inorganic plate according to claim 1, wherein the above-mentioned enhancement is provided.