JPS5935777B2 - Fibreboard manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing fiberboards such as asbestos boards and rock wool boards, and the main purpose is to obtain fiberboards with a good surface finish. Another purpose is to create an uneven pattern on the outer surface of the fiberboard during the papermaking process.

= In general, fiberboards such as asbestos boards and rock wool boards are produced by making a fiber slurry S on the outer periphery of a papermaking drum 2 rotating in a papermaking tank 1, and unwinding it sequentially from the papermaking drum 2, as shown in Fig. 1. The obtained wet mat 3 is pressed and dried in the next step to be made into a product, and therefore the papermaking drum 2
The outer surface of the wet mat 3 that is not in contact with the outer periphery is rougher than the surface that is in contact with the papermaking drum 2, and when it is manufactured into a product, the outer surface must be trimmed by cutting the rough surface. In order to create an uneven pattern on the surface of the fiberboard to be produced, the wet mat 3 unwound from the papermaking drum 2 must be passed through an embossing roll or the like, which is a problem in that a complicated process is required.

The present invention has been made in view of the above points, and will be described in detail below based on embodiments shown in the drawings.

The fiberboard manufacturing method of the present invention is characterized in that asbestos, rock wool, etc., which are fed into the paper-making tank 1, are placed around the first paper-making drum 2a and the second paper-making drum 2b, which rotate in opposite directions in the same paper-making tank 1. The fiber slurry S is made, and the second wet mat 3b unwound from the second paper making drum 2b is superimposed on the outer surface of the first wet mat 3a unwound from the first paper making drum 2a to form the first wet mat 3a and the second wet mat 3b. are laminated together.

Both the first paper-making drum 2a and the second paper-making drum 2b are cylinders made of wire mesh, and each has a fiber slug 'J-8' in the lower part.
The first papermaking drum 2a and the second papermaking drum 2b are immersed in water, rotated, and vacuumed at 200 to 300 mmHg to form the fiber slurry S onto a wire mesh surface.
The diameter ratio of the drums is about 34:1, and the first papermaking drum 2a and the second papermaking drum 2a and the second
A first wet mat 3a and a second wet mat 3b formed on the peripheral surface of the paper making drum 2b are used as fiber slugs IJ.
- At the same time as they come out of the inside of S, they are superimposed on each other's outer surfaces and are integrated.

That is, the first wet pine) 3a and the second wet pine) 3b are connected to the first and second paper making drums 2a, respectively, at the same paper making speed.
. The paper is dehydrated by a felt belt 5 running in contact with the upper part of the first papermaking drum 2a, sent to the next process using the second wet mat 3b as a surface layer, and then pressed and dried to be formed into a final product.

Since the upper surface of the fiberboard 4 obtained in this manner is in contact with the circumferential surface of the second papermaking drum 2b, the surface is finished smooth, and additional steps for surface finishing such as surface cutting are unnecessary. , fiberboard 4 with a good surface finish can be easily obtained.

Further, as shown in FIG. 3, if projections are provided on the outer circumferential surface of the second papermaking drum 2b to form unevenness 6 on this surface,
This unevenness 6 is transferred to the surface of the second wet pine 3b, that is, the surface of the fiberboard 40, thereby achieving the effect that the uneven pattern 7 can be applied to the surface of the fiberboard 4 at the papermaking stage and at the same time as papermaking. .

[Brief explanation of the drawing]

Fig. 1 is a schematic process diagram showing a conventional example, Fig. 2 is a process diagram showing an embodiment of the present invention, and Fig. 3 is a process diagram showing another embodiment of the same. 2a is the first papermaking drum;
2b is the second papermaking drum, 3a is the first wet mat, 3
b is a second wet mat, 4 is a fiberboard, 6 is an uneven pattern, and 7 is an uneven pattern.

Claims (1)

[Scope of Claims] 1. The fiber slurry in the papermaking tank is scooped up around a first papermaking drum and a second papermaking drum that rotate in opposite directions to each other in the same papermaking tank, and a second papermaking drum is unwound from the first papermaking drum. A method for producing a fiberboard comprising the steps of: superimposing a second wet mat unwound from a second papermaking drum on the outer surface of a first wet mat to integrally laminate the first wet mat and the second wet mat. 2. Claim 1, characterized in that an uneven pattern is formed on one side of the second wet mat using the unevenness provided on the outer peripheral surface of the second papermaking roll, and the surface opposite to the uneven pattern is superimposed on the first wet mat. The method for producing a fiberboard according to item 1.