JPH04363206A - Method for adding uneven patterns to inorganic extruded building materials - Google Patents

Abstract

PURPOSE:To stick a sharp uneven pattern on the surface of a molded form which is obtained by extruding the cement blending material incorporating an assisting agent for extrusion. CONSTITUTION:The cement blending material is blended with an assisting agent for extrusion which has such properties that the assisting agent is gelatinized by heating. After this cement blending material is extruded, an even pattern is marked on the surface of the shaped form by a press. In this case, a press platen is heated at the temp. wherein the assisting agent is gelatinized. The uneven pattern is marked by the heated press platen. Escape of pressure is prevented at a time for pressing by gelatinizing the assisting agent for extrusion by heat.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a method for patterning inorganic extruded building materials.

0002

BACKGROUND OF THE INVENTION Conventionally, as a means for manufacturing inorganic building materials molded from cement mixtures, an extrusion molding method in which an inorganic kneaded material is extruded and molded is known. This extrusion molding method has the advantage that it is suitable for mass production of decorative wallboards because it can continuously mold any number of uneven patterns that are continuous in the extrusion direction. However, with this extrusion molding method, it is not possible to create an uneven pattern in a direction that is not continuous with the extrusion direction.
When applying such an uneven pattern, it is possible to press an uneven patterning roll onto the surface of the uncured molded product immediately after it has been discharged from the extrusion molding machine, or to place the molded product on a template once, and then apply the An uneven pattern is applied to the surface of the uncured molded product by pressing an uneven pattern roll, or after the molded plate is once cured and hardened, the surface is ground to form an uneven pattern.

0003

[Problems with the prior art] However, among the above-mentioned means for imparting an uneven pattern that is not continuous in the extrusion direction, when the first and second uneven pattern forming roll means are used, the projecting portion for forming the uneven pattern is There is a problem that the corners of the uneven pattern inevitably become rounded due to galling interference, making it difficult to form a sharp pattern.Also, since the uncured molded product still has fluidity, the contact area of the uneven pattern is Due to the difference, there is a phenomenon where the material partially escapes, distorting the uneven pattern, and in the case of a brick-like uneven pattern, the pattern does not have linearity. Further, in the case of the third method for grinding a cured plate, although it does not have any of the above-mentioned problems, it does have the disadvantage that it requires a lot of time and effort because it processes a cured molded product.

[0004] In order to eliminate these drawbacks, a press plate is pressed against the surface of the uncured molded plate to form an uneven pattern all at once, but since the material has plasticity due to extrusion aids such as methyl cellulose, the material There was a problem that it was difficult to create sharp patterns due to the fluidity of the material.

[0005]

[Problems to be Solved by the Invention] In view of the above-mentioned problems, it is an object of the present invention to provide a method for forming an uneven pattern on an inorganic extruded building material, which can have a sharp shape and can be very easily provided with an uneven pattern. It has been done.

[0006]

[Means for Solving the Problems] That is, the method of applying uneven patterns to inorganic extruded building materials of the present invention involves extruding a cement mixture containing an extrusion aid that has the property of gelling when heated, and then In applying the uneven pattern to the surface by pressing, a press plate is heated to the above-mentioned gelling temperature, and the uneven pattern is formed using the heated press plate.

[0007]

[Operation] In the present invention, any cement mixture for extrusion molding can be used as long as the properties do not conflict with the extrusion molding material. In the present invention, an extrusion aid for this formulation is used that has the property of gelling when heated. As the extrusion aid, in addition to the usual methylcellulose and ethylcellulose, methylcellulose having a carboxyl group, ethylcellulose, methylcellulose to which a block isocyanate is added, or ethylcellulose can be used.

[0008] This inorganic kneaded material to which the extrusion aid has been added is extruded into a plate shape by extrusion molding, and then the molded plate is pressed with a press plate heated to a temperature at which the extrusion aid is thermally gelled. The heat causes the extrusion aid present near the surface to gel, allowing the press pressure to be absorbed without escaping, resulting in a sharp uneven pattern. Also, since the surface of the molded product becomes gelled, it is easy to release from the mold.

Next, an embodiment of the present invention will be described. Example 1 Ordinary methylcellulose was prepared as an extrusion aid that undergoes thermal gelation, and an inorganic blend containing 43% by weight of cement, 43% by weight of silica, 7% by weight of pulp fibers, and 7% by weight of lightweight aggregate 100 1.0% by weight as a percentage of weight%
The above methyl cellulose and 40% by weight of water were added, thoroughly kneaded, and fed to an extruder to a thickness of 2 cm and a width of 20 cm.
A molded plate with a length of 40 cm was extruded, and then a press plate heated to 100°C was applied to the surface of the molded plate with a weight of 2 kg/cm2.
A brick-like joint pattern with a depth of 4 mm was created by pressing with When the surface of the molded plate after pressing was observed, it was confirmed that the joint pattern with sharp corners was clearly formed.

Example 2 Methyl cellulose having a carboxyl group was prepared as an extrusion aid that undergoes thermal gelation, and was mixed with 43% by weight of cement, 43% by weight of silica, 7% by weight of pulp fiber, and 7% by weight of lightweight aggregate. 1.0% by weight of the above methylcellulose and 40% by weight of water were added to 100% by weight of the inorganic mixture, thoroughly kneaded, and fed to an extruder to form a 2cm thick inorganic compound.
A molded plate with a width of 20 cm and a length of 40 cm was extruded, and then a brick-like joint pattern with a depth of 4 mm was applied to the surface of the molded plate by pressing with a press plate heated to 100° C. at 2 kg/cm 2 . When observing the surface of the molded plate after pressing,
It was confirmed that the sharp joint pattern at the corners was clearly formed.

Example 3 Blocked isocyanate (manufactured by M.D. Kasei Co., Ltd.: trade name: ISOSIA) was used as an extrusion aid that undergoes thermal gelation.
Methyl cellulose to which NATE 125M) was added was prepared, and extrusion molding and pressing were performed in the same manner as in Example 1. In this case as well, the same uneven pattern as in Example 1 was provided.

[0012] As a comparative example, a similar pattern was made using a press plate that was not heated, but joints of sufficient depth could not be obtained, and the pattern was misaligned due to the fluidity of the material or the protrusions ``Bali''-like flakes were occasionally seen on the corners. Further, the same joint pattern as in the example was applied to a patterning roll, but only a concavo-convex pattern with rounded corners with a radius of 2 to 3 mm could be formed. Further, in this case, the linearity of the brick-like joint pattern was poor, resulting in an uneven pattern with slight fluctuations.

[0013]

[Effects of the Invention] As explained above, according to the present invention, the surface of the molded product gels when it is pressurized with a press plate, which prevents the material from ``escaping'' due to pressure and creates a sharp uneven pattern. This makes it possible to do so.

Claims (1)

[Claims] [Claim 1] After extrusion molding a cement mixture containing an extrusion aid that has the property of gelling when heated,
A method for imparting an uneven pattern to an extruded inorganic building material, which comprises heating a press plate to the above-mentioned gelling temperature to impart an uneven pattern to the surface of the extruded body by pressing, and applying the uneven pattern using the heated press plate.