JPS61179704A - Manufacture of inorganic 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 (Field of Industrial Application) The present invention makes it possible to easily and accurately produce a dense inorganic molded product having a complex three-dimensional pattern such as a deep embossed pattern on its surface, while also being economical. The present invention relates to a method for manufacturing inorganic molded products that have excellent properties.

(Prior art and its problems) For example, an extrusion filling method has been proposed as a manufacturing method for producing an inorganic molded product such as cement that has a three-dimensional pattern such as wood grain or stone grain on the surface (Japanese Patent Application Laid-Open No. 1983-1989-1). (Refer to Publication No. 136208), this manufacturing method involves filling a closed mold with a hydraulic inorganic material such as a cement composition. Since the material flows in the longitudinal direction of the mold, if there are relatively deep grooves or relatively large protruding convex parts in the mold, the material will not be sufficiently filled into the grooves. In addition to this, the surface of the molded product is scratched by the convex part, and the pattern on the surface of the molded product becomes unclear. There was a problem that the surface became rough.

For this reason, with conventional extrusion filling molding methods, although it is possible to create a monotonous three-dimensional pattern on the surface of a molded product, it is difficult to create a complex three-dimensional pattern with a noticeable unevenness. was virtually impossible. Furthermore, since the material flows in the length direction of the mold, the material may not be filled uniformly into the mold, leading to the formation of cavities in the molded product and a decrease in the strength of the molded product. There was also.

It is an object of the present invention to provide a method for manufacturing inorganic molded products that solves these problems and is also economically efficient.

(Means for Solving the Problems) The method for producing an inorganic molded product of the present invention (hereinafter referred to as the method) involves cutting a molded product 3 extruded using a hydraulic inorganic material such as a cement composition into a predetermined length. to obtain a primary molded body 1,
-Wrap the blown product 1 with a release film material 4, place it in a mold 5, place it in a mold 6 while it is in the mold 5, and compression mold it, and after the compression molding is finished. The obtained secondary molded body 10 is removed from the mold while being placed in the mold 5, and then the secondary molded body 10 is partially cured and hardened to the extent that it does not lose its shape. The partially cured and cured secondary molded body 10 is removed from the molding mold 5, and the molded body 10 is removed from the molding mold 5.
1 and completely cured and hardened.

Here, the blow molded product 1 is finished in a shape close to a desired molded product. The mold 5 has sufficient strength to support the secondary molded product 10 and has an inner surface shape that corresponds to the surface shape (wood grain, stone grain, etc.) of the intended molded product. (See Figure 2). Also, release film material 4
As the film material, a film material is used that has no self-adhesion and is easy to handle, adapts to the elongation of the material during compression molding and extends freely without tearing, and has the property of easily peeling off from the mold and the molded body. .

(Embodiment) An embodiment of the present invention will be described below based on the drawings, taking as an example a case where a semi-cylindrical pseudo-wood is manufactured.

The first step is to form the primary molded body 1 by extrusion molding, in which the cement composition is extruded from the mouthpiece of the vacuum extruder 2 to form the desired cross-sectional shape of the artificial wood (see Figure 5). A nearly semi-cylindrical molded product 3 is obtained (see FIG. 1), and the molded product 3 is cut into a predetermined length to form a primary molded product 1 (see FIG. 2). The cement composition used is one obtained by kneading cement, fibrous material, aggregate, a viscosity imparting agent such as methylcellulose, water, and the like.

In the second step, the blown molded product 1 is wrapped with a release film material 4 (see FIG. 2), and placed in a mold 5.
The molded product is placed in the lower die 7 of the mold 6 in the state in which it is placed in the molding receiving mold 5, and the upper die 9 is pressed by a press to compression mold the primary molded product 1 (see Fig. 3), and the secondary molded product. This is the process of obtaining 10. The inner surface of the molding mold 5 is provided with uneven parts corresponding to the wood grain and pruning of the molded product (fake wood), and the release film material 4 has no self-adhesion and has no extensibility. For example, polyethylene film, which has excellent releasability and is inexpensive, can be suitably used.

From the compression molding 4 m, - the blow molded body 1 is formed by the upper mold 9 of the mold 6;
It is easily deformed according to the inner surface shape of the molding mold 5, and when the mold is removed, the uneven parts provided on the inner surfaces of the upper mold 9 and the molding mold 5 are faithfully transferred. ) 10 is obtained (see Figure 4). As mentioned above, the release film material 4 does not have self-adhesiveness, so it is extremely easy to wrap the blown molded product l, and since it has extensibility, it adapts to the elongation of the material during compression molding. and extend freely. Furthermore, since the mold release film material 4 has excellent releasability, the secondary molded product 10 can be easily released from the upper mold 9, and since the mold receiving mold 5 is used, it can also be easily released from the lower mold 7. It's easy.

In the third step, after the compression molding is completed, the obtained secondary molded body 10
The secondary molded body 10 placed in the mold 5 is removed from the mold, and the secondary formed body 10 placed on the molded body 5 is moved to a curing place and steam-cured at a constant temperature for a certain period of time to ensure that the secondary molded body 10 does not lose its shape. This is a process of partially curing and hardening to the extent that no damage occurs.

The fourth step is to partially cure and harden the secondary formed body 10.
is removed from the mold 5, and as shown in FIG.
This is the process of completely curing and hardening. At this time, due to the excellent releasability of the release film material 4, the secondary molded body 10 is
Even the portion that has bitten into the relatively deep recess of the molding mold 5 can be easily separated from the molding mold 5 together with the release film material 4.

Note that the saucer 11 may be formed as a gutter-like body or the like.

The method of the present invention can be applied to the production of a wide range of inorganic molded products, such as architectural angle materials and channel materials, in addition to the production of the above-mentioned artificial wood. In addition, the mold 6 is a left-right type, and the primary molded body 1 housed in the mold receiving mold 5 is pressed in the horizontal direction.
The blow molded body 1 may also be subjected to compression molding.

(Effects of the Invention) ■ The present invention performs compression molding on a primary molded product obtained through extrusion molding to obtain a secondary molded product. In addition, even complex three-dimensional patterns such as deep embossed patterns can be displayed clearly and accurately. Furthermore, it is possible to obtain a molded product that is dense and therefore has high strength. The reason for this is that in the extrusion filling molding method, the flow of material within the mold is in the length direction of the mold (the length direction of the desired molded product). In addition to making it difficult to fill the grooves with material sufficiently, the pattern becomes unclear, and the surface of the molded product is scratched by the white part provided on the inner surface of the mold, causing the surface of the molded product to become rough and the material to be damaged. However, in the compression molding of the present invention, the flow of material in the mold is in the direction of the thickness of the mold (the thickness of the desired molded product). direction), the material is sufficiently pushed into the recess provided in the mold, etc.
Also, since the surface of the molded product is not scratched, a clear and precise three-dimensional pattern can be created, and since the material is filled into the mold with uniform pressure, a dense molded product can be obtained. It will be done.

■ - When performing compression molding on a blown body, a mold is used, and after compression molding is completed, the resulting secondary molded body is removed from the mold while remaining in the mold. Immediately after the molding is completed, the next compression molding is performed, which improves the molding efficiency.

- When performing compression molding on a blown molded product, the blown molded product is wrapped in a release film material, and curing is limited to the partial curing and curing stage while it is placed in a mold receiving mold. . Therefore, the mold can be used repeatedly at high rotation speeds, and it is therefore very economical to manufacture the mold in only the required quantity. Furthermore, since the release film material has excellent releasability, the secondary molded product together with the release film material can be removed from the mold very easily. Therefore, it is possible to reliably avoid the possibility that a part of the material of the molded object may adhere to the inner surface of the mold, which is the case when the molded object is placed directly into the mold, and it is possible to produce a molded product with high precision. becomes. Moreover, after the secondary molded body is removed, it can be reused as is without cleaning the inner surface of the mold.

■ As mentioned above, the main function of the release film material is to facilitate release from the mold, but the release film material attached to the surface of the molded product must be peeled off during the use stage. In some cases, the release film material also functions as a protector to prevent damage to the molded article.

[Brief explanation of the drawing]

Figure 1 is a side view explaining the outline of extrusion molding, Figure 2 is a perspective view showing the primary molded body wrapped in a release film material together with a molding mold, and Figure 3 is an outline of compression processing. FIG. 4 is a sectional view showing the secondary molded body removed from the mold, and FIG. 5 is a perspective view showing the secondary molded body in a fully cured and hardened state. DESCRIPTION OF SYMBOLS 1...-Blow molded article, 3... Molded article, 4... Release film material, 5... Molding receiving mold, 6... Mold, 10...
・Secondary molded body, 11...receptacle. Patent applicant Agent: Fukubi Chemical Industry Co., Ltd.
Patent Attorney Kiyoshi Moto - Department Figure 3 Figure 4

Claims (1)

[Claims] A molded product 3 extruded using a hydraulic inorganic material such as a cement composition is cut into a predetermined length to obtain a primary molded product 1, the primary molded product 1 is wrapped in a release film material 4, and this is molded. The resulting secondary molded product 10 is placed in a mold 5 and placed in a mold 6 for compression molding. After the compression molding is completed, the resulting secondary molded product 10 is removed while still being placed in the mold 5. After that, the secondary molded product 10 is partially cured and hardened to the extent that it does not lose its shape, and then the partially cured and cured secondary molded product 10 is removed from the mold receiving mold 5. Receiver 11
A method for manufacturing an inorganic molded product, which is characterized by transferring the product to a container and completely curing and hardening it.