JPH06234109A - Patterning of cement product with embossed surface - Google Patents

Abstract

PURPOSE:To pattern the surface of an uncured cement product with a sharply impressed deep embossed design in a single round of pressing step when pressing the surface of the product in a embossed pattern. CONSTITUTION:When pressing the surface of a cement molded product G immediately after being molded, in an uneven design, a pressing die 1 with an air bleeding hole 3 for deaeration at the bottom of a recessed surface 1A of a punch having or not having a peripheral frame for molding the projecting pattern of a finished product, presses the surface of the cement molded product with a concurrent action to deaerate forcibly to provide an embossed pattern. A deep, sharply impressed embossed pattern is provided by discharging the air entrapped in the inner surface of the recessed part of the punch by forced deaeration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for patterning unevenness of a cement product and a die thereof, and more specifically, to a surface of a plate-shaped molded product obtained by extrusion-molding a cement kneaded product containing methyl cellulose or the like, The present invention relates to improvement of a method of adding a sharp uneven pattern.

[0002]

2. Description of the Related Art Heretofore, it has been widely practiced to extrude cement-kneaded products to produce extruded products having various cross-sectional shapes. This molding method has an advantage that a product having an arbitrary cross section can be continuously molded by changing the cross-sectional shape of a molding die for extrusion molding, and various products with excellent design characteristics can be mass-produced. However, this cross-sectional shape becomes a continuous uniform shape in the extrusion direction, and when an uneven pattern that is not continuous in the extrusion direction is applied, for example, an uneven roll is brought into contact with the surface of the extruded product and the speed synchronized with the extrusion speed is used. It must be rotated by, or by means of patterning with an uneven patterning press.

[0003]

[Problems of the prior art] However, when an uneven pattern is formed by a roll, in the case of a deep uneven pattern, the interference of a convex type with a concave pattern occurs, and a sharp uneven pattern is not formed. In this case, since the molded product has a fluidity due to the addition of methyl cellulose or the like immediately after extrusion and thus has a deep uneven pattern, even if the press is pressed with a strong compressive force,
The material flows in the width direction and escapes, and since air is trapped inside the inner surface of the mold recess, it is impossible to form a deep uneven pattern. In particular, when an uneven pattern like a brickwork is applied, the linearity of the groove portion cannot be obtained due to the escape of these materials, and it is difficult to obtain a product with a sharp uneven pattern with a uniform appearance. It was

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention has been made for the purpose of obtaining a method for forming a concavo-convex pattern on a cement product, which can easily form a deep concavo-convex pattern, and a mold thereof. is there.

[0005]

That is, a method for forming an uneven pattern on a cement product according to the present invention is a mold for forming an uneven pattern of a product when an uneven pattern is formed on a surface of a cement molded product G immediately after molding by a press. The surface of the cement molded article is pressed to form an uneven pattern while forcibly degassing from the bottom of the concave surface 1A.

Another object of the present invention is to apply an uneven pattern to the surface of a cement molded product G immediately after molding by pressing,
Forced degassing from the degassing vent hole 3 with a press die 1 that has a frame 1H that regulates the periphery of the product and has a degassing vent hole 3 at the bottom of the concave surface 1A of the die 1 that forms the convex pattern of the product. At the same time, the surface of the cement molded product is pressed to form an uneven pattern.

[0007]

According to the present invention, a mold for forming a convex pattern of a product with or without a frame 1H for restricting the periphery of the product when a concave-convex pattern is formed on the surface of the cement molded product G immediately after molding by pressing. The surface of the cement molded product is pressed while forcibly degassing from the bottom of the concave surface 1A.

At this time, the air sealed in the frame 1H or the air trapped between the surface of the product G and the bottom surface of the recess 1A of the upper die is forcibly discharged to the outside, so that even a deep uneven pattern is obtained. It becomes possible to form clearly in one pressing process.

In the mold 1 used in the present invention, the bottom surface of the concave portion 1A forming the surface of the convex portion of the product is the filter 2 surface which is finer than the cement particles, and the cement particles are less likely to be clogged with the eyes of the filter 2 and are separated from each other. Clogs are easily cleared by the reverse injection during molding.

[0010]

Embodiments of the present invention will be described below. Figure 1
FIG. 5 is a cross-sectional view of essential parts showing the process of the method of the present invention and an embodiment of a press die.

[Example 1] Cement 47.5% by weight, silica sand 4
A cement mixture consisting of 7.5% by weight and 5% by weight pulp fiber, 22.5% by weight of methylcellulose and 12.5% by weight of the cement mixture was extruded to obtain a thickness of 2c.
A band-shaped compact G having a width of m and a width of 30 cm is molded, and this band-shaped compact G
As shown in Fig. 1, the surface of the mold is 30 cm x 90 cm, and the unevenness is 8
The degassing hole 3 is made up of a mold 1 having a continuous brick-like pattern with a joint having a width of 8 mm and a pitch of 6 cm × 9 cm in 8 mm.
While forcibly degassing from No. 3, it was pressed as shown in FIG. 2 to give a concavo-convex pattern, and then at the time of demolding, reverse injection was performed from degassing holes 3 ... As shown in FIG. 3, the product had a slight flash-like extension G2 at the peripheral edge, but the uneven pattern on the surface itself was a brick-like uneven pattern with a deep and sharp uneven pattern with a joint depth of 8 mm. A plate-shaped molded product having a pattern could be molded.

The mold 1 comprises filters 2 and 2 having finer meshes than cement particles on the bottom surface of a concave portion 1A for molding a convex brick portion on the surface of the molded body G, and degassing holes 3 for communicating the mold 1 to the outside. ... Mold body plate 1C having a large number of 3
In addition, the ridge bar 1 for forming the recess joint on the surface of the molded body G
It was fixed via B and 1B.

In the embodiment, 1D is a checker plate constituting the mold 1, 1E is the same punching plate,
4 and 4 are bolts for fixing the projecting bar 1B and the filter 2, G1 is a product pallet, and 1F is a lower frame.

[Second Embodiment] As shown in FIG. 4, the same as the first embodiment except that the mold 1 is surrounded by a mold frame 1H which is slidably movable with respect to the mold 1. The product was pressed. As a result, a plate-like molded product having a brick-like uneven pattern having a deep and sharp uneven pattern with a joint depth of 8 mm could be formed without any occurrence of the flash-like extending portion generated in Example 1.

As a comparative example, a press die having no vent holes was provided with the same unevenness pattern as in the embodiment, but the linearity of the joint was poor due to the escape of the material, and the contour of the unevenness was clearly defined by the air pressure trapped in the recess. Only uneven patterns could be formed. Further, in the case of molding with a framed press, the contour of the concavo-convex pattern became less clear than in the comparative example due to the air trapped in the frame.

[0016]

As described above, according to the method of the present invention, the air trapped between the mold and the molded body is forcibly degassed to the outside through the filter 2. It is possible to suppress the adverse effect that occurs on the surface of the uncured product, which was not possible in the past, and at the time of mold release, the reverse injection from the degassing holes makes release very easy and the filter This also effectively prevents clogging and facilitates maintenance.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a state before pressing of the present invention.

FIG. 2 is a cross-sectional view of essential parts showing a state during pressing of the present invention.

FIG. 3 is a cross-sectional view of an essential part showing a state after pressing according to the present invention.

FIG. 4 is a cross-sectional view of essential parts showing an embodiment of the framed press of the present invention.

FIG. 5 is a cross-sectional view of essential parts showing an embodiment of the framed press of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mold 1A ... Recess 1B ... Ridge bar 1C ... Upper mold body plate 1D ... Checker plate 1E ... Punching plate 2 ... Filter 3 ... Degassing hole

Claims (2)

[Claims] 1. When applying a concavo-convex pattern to the surface of a cement molded product G immediately after molding by pressing, the surface of the cement molded product is pressed while forcibly degassing from the bottom of the concave surface 1A of the mold forming the convex pattern of the product. A method for applying an uneven pattern to an extruded cement product, which comprises applying an uneven pattern to the product. 2. The surface of a cement molded product G immediately after being molded has a frame 1H for restricting the periphery of the product when a concave and convex pattern is formed by a press, and the bottom of the concave surface 1A of a mold 1 for forming the convex pattern of the product. Concavo-convex pattern of extruded cement product characterized in that the surface of the cement molded product is pressed by the press die 1 having the vent hole 3 for degassing while degassing from the vent hole 3 for degassing to give an uneven pattern. Patterning method.