JPS62211105A - Method of forming irregular pattern to extrusion molded shape - 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 forming an uneven pattern on an extrusion molded product whose main raw material is a hydraulic substance, and particularly relates to a method capable of forming a clear and deep pattern. be.

[Conventional technology]

The main raw material is a hydraulic substance such as cement, hydraulic gypsum, or a mixture of calcareous raw materials and silicic raw materials, and if necessary, reinforcing fibers, lightweight materials, hardening accelerators, etc. are added to the mixed raw material in water. Extruded products obtained by kneading and kneading to form a base material, extruding the base material, and curing it in natural aqua steam or an autoclave are widely used as interior and exterior materials.

In order to improve the appearance of extruded products, continuous grooves are added to the surface in the same direction as the extrusion direction, but to further improve the appearance, discontinuous uneven patterns (hereinafter referred to as embossed patterns) are used. In order to emphasize the effect of the embossed pattern, it is desired that the depth of the pattern be as deep as possible, for example 3 mm, preferably 5 mm or more.

One method of applying an embossed pattern is to press a roll engraved with the pattern onto the uncured molded product being extruded, rotate it in synchronization with the uncured molded product, and transfer the pattern to the uncured molded product, but the transfer mechanism is As shown in FIG. 4, which is a schematic cross-sectional view, it has the following drawbacks.

That is, the uncured molded body 1 (the extrusion direction is shown by the arrow) obtained by extrusion molding the base material has a pattern transferred thereto by the pattern protrusion 3 of the roll 2 (the rotational direction is shown by the arrow) pressed thereon. However, the process in which the protrusion enters the uncured molded body (
In A), the X portion of the uncured molded body is scraped by the protrusion, which causes a bulge in the Y portion;
This deformation is further magnified in the process (B) when the roll rotates further and leaves the uncured molded body, and the outline of the transferred pattern becomes extremely unclear from the desired pattern shown as Z in (C). .

For this reason, patterning using a roll has the disadvantage that only a very shallow pattern can be formed with a depth of about 2 mm at most.

Another method of applying an embossed pattern is to press a flexible sheet engraved with a pattern synchronously onto the uncured molded product being extruded to transfer the pattern, but this method also uses a roll as the pattern transfer mechanism. As well as having similar drawbacks to be similar to.

Because the sheet is flexible, it tends to deform when pressed against an uncured molded body, making the pattern further unclear.

[Problems to be Solved by the Invention] The present invention solves the drawbacks of the conventional force υ and provides a method for forming deep and clear patterns on an extruded product.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention aims to provide an extrusion-molded body made of a hydraulic material as a main raw material with an uneven pattern. This is a method in which a pattern engraved on a plate is transferred to an uncured molded body.

[Effect]

One example of the present invention (hereinafter referred to as the first method) will be explained using FIGS. 1 and 2. FIG. 1 is a schematic view seen from downstream in the extrusion direction, and FIG. 2 is a view taken along the line A--A in FIG. 1.

The uncured molded body l, which is extruded from the mouthpiece 4 of an extruder and held on a conveyor (not shown) using a hydraulic substance as a raw material, has an unpatterned portion that is longer than the length of the plate 5 on which the pattern is engraved. When the sowing is finished, the operation of the extruder is stopped, and the plate is pressed into an uncured molded body using a press 6, and the pattern engraved on the plate is transferred to the uncured molded body.The plate is pressed into an uncured molded body. After the uncured molded body is released, the extruder is operated to extrude the uncured molded body over the length of the plate, and the extruder is stopped and the plate is repeatedly suppressed and detached.

The pattern engraved on the plate is pressed and released perpendicularly to the uncured molded body, and there is no change in the position between the uncured molded body and the plate during the transfer of the pattern, which is different from that seen with conventional methods. There is no deformation of the pattern at all, and it is possible to create clear and deep patterns.

Note that the core 7 is not necessary when producing an extruded product without holes 8.

The material of the plate used in the present invention is not particularly limited as long as it does not cause substantial distortion when pressed against an uncured molded body, and iron, copper, brass, hard synthetic resin, etc. may be used singly or in combination. In addition, the frequency of use and the details of the pattern that should be attached 1
They are selected based on factors such as price.

The method of the present invention can be carried out without stopping the operation of the extruder. In this method (hereinafter referred to as the second method), the plate pressed against the uncured molded body is moved together with the uncured molded body for the time required to transfer the pattern, and then separated from the uncured molded body and moved toward the mouth. For reverse feeding and patterning, when the position of the end of the part in the direction of the base is the same as the position of the end of the plate in the direction opposite to the base, the plate is uncured in synchronization with the speed of the uncured molded body. Press the molded body and repeat this series of operations. This operation is performed by inputting the extrusion speed of the uncured molded body, the time required for suppressing and detaching the plate, the time required for refeeding the plate, etc. into a computer. Can be automatically controlled.

In the second method as well, there is no change in the position between the uncured molded body and the plate material during the period when the plate body is press-fitted into and removed from the uncured molded body, so a clear deep pattern is created, There is no need to stop the extruder, which not only increases productivity but also improves the quality of the extruded product.

The present invention can also be carried out by the following method (hereinafter referred to as the third method).
As in the method described above, the extruder is operated without stopping and the uncured molded body is continuously extruded, and the plate pressed against the uncured molded body moves in sync with the uncured molded body and then leaves. .

The third method differs from the second method in that, whereas the second method uses one plate that is sent back and recycled, multiple plates are circulated sequentially. The purpose is to ensure that two of them are always connected successively and press the uncured molded product.

The suppression/separation circulation of the plate is automatically performed by inputting the extrusion speed of the uncured molded body, the time required for suppressing/separating the plate, the time required for circulating the separated plate to the suppressed position, etc. into the '111t calculator. can be controlled.

In addition to the effects obtained by the second method, the third method has the advantage that the plate pressing the uncured molded product is always 2! Since it is connected to Si, it has the effect of further improving the continuity of the pattern.

〔Example〕

80 parts by weight of Teitong Portland cement, 20 parts by weight of chrysotile asbestos, 0.8 parts of methyl cellulose and 25 parts by weight of wood were kneaded to form a base material, and an uncured molded body with a thickness of 30 mm and a width of 250 mm without voids was made. Extruded. The extrusion speed was approximately 6 cm 7 seconds. The plate is 30m thick
A pattern was engraved on a hard synthetic resin plate measuring 250 mm in length and 500 mm in length.

Patterning was performed by the first method, and the necessary suppression time was about 7 seconds/time.

A cross-sectional view of the patterned part of the obtained product is shown in FIG. Clear patterns with depths of 3, 5 and 15 mm were obtained.

〔Effect of the invention〕

According to the present invention, it has become possible to add a clear deep embossed pattern to an extruded product whose main raw material is a hydraulic substance, thereby improving the aesthetic appearance of the extruded product and increasing its commercial value.

[Brief explanation of drawings]

FIG. 1 is a schematic view of one example of the apparatus used in the method of the present invention, viewed from downstream in the extrusion direction, FIG. 2 is a view taken along arrow A-A in FIG. 1,
FIG. 3 is a longitudinal sectional view of a patterned portion of an extruded product obtained by the present invention, and FIG. 4 is a schematic sectional view showing a transfer mechanism according to a conventional method.

Claims (1)

[Claims] 1 In a method for patterning an extruded molded body using a hydraulic substance as the main raw material, a plate with a pattern engraved on it is pressed against an uncured molded body and then released, and the pattern engraved on the plate is transferred to the uncured molded body. A method for forming an uneven pattern on an extrusion molded article.