JPH0435904A - Manufacture of hydraulic inorganic molding - Google Patents

Abstract

PURPOSE:To surely manufacture a desired shape hydraulic inorganic composition, and render the change of a dehydration filter cloth unnecessary, and thus improve the workability thereof. CONSTITUTION:In the recession 2a of a lower mold 2, a mat 8 to be a dehydra tion filter cloth is charged, simultaneously, a hydraulic inorganic composition material 9 is also charged therein. By keeping the state as it is, an upper mold 1 is lowered so as to effect press molding. In the case of performing the press, moisture contained in the hydraulic inorganic composition material 9 is removed via the mat 8, a dehydration plate 6, and a dehydration path 5. After pressing, the mat 8 that effects as a dehydration filter cloth is allowed to be adhered to a roof tile. Accordingly, since a new mat 8 is supplied at every pressing, dehydration defects due to the blinding of the dehydration filter cloth never occur. Further, in the case of molding a complicate configuration article, as the mat 8 to be a dehydration filter cloth 8 is adhered to the roof tile 10, problems that can be followed by the breakage of the dehydration filter cloth by projections or the like also do not occur.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for producing a hydraulic inorganic molded article,
In particular, the present invention relates to a method for producing a hydraulic inorganic molded product in which the press dewatering process using a press is improved.

[Conventional technology]

By pressing hydraulic mineral composition materials such as cement, mortar or calcium silicate, various products such as building materials are obtained.

Conventionally, in this type of press molding, a large number of dewatering channels are opened over almost the entire surface of the upper die and the pressing surface, and a large number of dewatering holes are provided on the pressing surface corresponding to the dewatering channels. The dehydration process was carried out using a press machine equipped with a lower die in which a dehydration hole plate, a wire mesh, and a dehydration filter cloth were laminated in this order.

That is, a dehydration hole plate made of, for example, an iron plate and a wire mesh are fixed on the pressing surface of the lower mold, and a dehydration filter cloth is fixed to the wire mesh with a wire, and the lower mold prepared in this way,
A hydraulic inorganic molded article of a desired shape was manufactured by charging a hydraulic inorganic composition material between the upper mold and dehydration pressing (for example, JP-A No. 63-22806).
.

[Problem to be solved by the invention]

However, when a hydraulic inorganic molded product is continuously dehydrated and press-molded using a press machine with the above structure,
There was a problem in that the fine powder of hydraulic inorganic molded products such as cement gradually clogged the dewatering filter cloth, resulting in poor dewatering performance. In particular, when obtaining a molded product with a complicated shape, the dehydration filter cloth may be damaged by the protrusions of the molded product.

The above-mentioned problem becomes noticeable when the molding cycle is repeated 100 times or more, and therefore, it is necessary to replace the dewatering filter cloth each time.

The present invention eliminates the drawbacks of the conventional manufacturing methods described above, and makes it possible to reliably produce a hydraulic inorganic molded product in a desired shape, and eliminates the need to replace the filter cloth for dewatering, thereby improving work efficiency. The object of the present invention is to provide a method for producing a hydraulic inorganic molded article that can improve properties.

[Means to solve the problem]

The present invention uses a press machine that has an upper die and a lower die and has a plurality of dehydration channels on the pressing surface to press and dehydrate a hydraulic inorganic composition material to form a hydraulic inorganic composition into a desired shape. A method for obtaining a molded article is characterized by comprising the following steps.

That is, the method is characterized in that a hydraulic inorganic molded article having a mat fixed to one side is obtained by pressing together a hydraulic inorganic composition material and a mat serving as a filter cloth for dehydration.

[Effect]

In the manufacturing method of the present invention, after the mat serving as the dehydration filter cloth is pressed by a press machine, it is fixed to the product side, that is, the hydraulic inorganic molded product side.

Therefore, the mat that functions as a filter cloth for dewatering cannot be used repeatedly. Therefore, during pressing, a mat serving as a new dehydration filter cloth is always supplied, so that the dehydration assisting action of the mat is reliably performed, and a molded product having a desired shape can be reliably obtained. Moreover, since the mat is simply charged, the mat is easily supplied. Therefore, work efficiency is also improved.

That is, the present invention has been developed in view of the fact that the various problems described above occur with repeated use of dehydration filter cloths that are directly or indirectly fixed to the pressing surface of the lower die with wires or the like. As an alternative to such a filter cloth for dehydration, a mat that can be used as a filter cloth for dehydration can be created by charging the mat that will become the filter cloth for dehydration into a press machine together with a hydraulic inorganic composition material and pressing them simultaneously to integrate them. It is characterized by avoiding repeated use.

[Explanation of Examples] An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1A to 1C are cross-sectional views showing each step of the manufacturing method of this embodiment. This example is an example in which the present invention is applied to a method for manufacturing a roof tile as a hydraulic inorganic molded product.

First, as shown in FIG. 1(a), a press machine 3 having an upper die 1 and a lower die 2 is prepared. The upper die 1 is fixed to a shaft 4 and is configured to be movable up and down by a drive source (not shown). A recess 1a is formed in the lower surface of the upper mold 1 and has a shape that matches the shape of the upper part of the molded product obtained by the press 3.

The lower mold 2 also has a recess 2a formed on the upper surface side, the shape of which matches the shape of the lower part of the molded product. In addition, inside the lower mold 2,
A plurality of dewatering channels 5 are formed, and the dewatering channels 5 are opened in the recess 2a. This dewatering channel 5 allows water to be removed in the pressing process, which will be described later, to escape.

A dehydration hole plate 6 is placed on the pressing surface 2b within the recess 2a. The dehydration hole plate 6 is made of a metal plate such as an iron plate, and has a through hole 6a formed therein that corresponds to the opening of the dehydration channel 5.

A wire mesh 7 is arranged on the upper surface of the dehydration hole plate 6.

The wire mesh 7 is provided to form a space for collecting moisture generated from the hydraulic inorganic composition material during pressing into the through holes of the dehydration hole plate 6. Instead of the wire mesh 7, a cotton-like material made of a material other than metal may be used.

The dewatering hole plate 6 and the wire mesh 7 described above are placed on the pressing surface 2b of the lower mold 2 and are fixed.

Using the press machine 3 having the above structure, hydraulic state I! press the quality composition material. That is, Fig. 1 (b
), a mantle 8 serving as a dehydration filter cloth is charged in the recess 2a of the lower mold 2, and at the same time, a hydraulic inorganic composition material 9 is also charged. Then, in this state, the upper mold 1 is lowered to perform press molding (see FIG. 1(c)).

During this pressing, water contained in the hydraulic inorganic composition material 9 is removed via the mat 8, the dehydration hole plate 6, and the dehydration channel 5.

In addition, the dehydration plate and the dehydration channel may be provided on the pressing surface of the upper mold. In this case, a mat serving as a filter cloth for dehydration is placed on the top surface of the hydraulic inorganic composition and pressed, and the hydraulic inorganic composition is The water contained in the mold is removed by suction from the upper mold.

Hydraulic inorganic molded product obtained by the above-mentioned press dehydration molding,
That is, the roof tile is shown in FIGS. 2(a) to 2(c) in cross-sectional view, perspective view, and side view, respectively. As is clear from FIG. 2, the obtained roof tile 10 has a mat 8 on the lower surface. are integrally fixed.

In the manufacturing method of this embodiment, the mat 8 that acts as a dehydration filter cloth is charged together with the hydraulic inorganic composition material 9 during pressing, and is fixed to the roof tile 10 after pressing. Therefore, a new mat 8 is supplied each time the press is performed, so there is no problem of poor dehydration due to clogging of the dehydration filter cloth as in the conventional method. When molding a product with a complicated shape, the filter cloth may be damaged by the protrusions of the product, but in the manufacturing method of this example, the mat 8 that becomes the dehydrated filter cloth
Since it is fixed to the roof tile 10, problems associated with damage to the dewatering filter cloth do not occur.

In addition, as is clear from FIG. 1(b), the mat 8 is
Since it is simply charged together with the hydraulic inorganic composition material 9, its supply is easily performed. That is,
In the conventional method, the dehydration filter cloth was fixed to the dehydration hole plate 6 or the wire mesh 7 with a wire or the like, so replacing the dehydration filter cloth was very complicated.However, in the manufacturing method of this embodiment, the mat 8 is Since it is simply charged, it is extremely easy to supply and work efficiency is greatly improved.

It is known that when a load is applied to the surface of a roof tile from above, the applied force becomes tensile stress and is generated on the back side. When the roof tile is flat, this tensile stress is concentrated directly below the load point. In particular, when roof tiles are formed by the dewatering press method described above, the back side is covered with a layer that cannot have a dense structure due to mechanical problems, so it is particularly vulnerable to this tensile stress. There was the problem of becoming a thing.

On the other hand, it is also well known that hydraulic inorganic molded products have the property of being strong against compressive loads but weak against tensile loads.

Therefore, in the case of the roof tile 10 shown in this embodiment, if a highly elastic fiber mat is used as the mat 8, the mat 8 will not be fixed to the back surface of the roof tile 10.
It also becomes possible to increase the strength of roof tiles.

Materials constituting the above-mentioned highly elastic fiber mat include, for example, glass fiber, carbon fiber, metal fiber,
Alternatively, organic fibers such as vinylon, aramid, acrylic or polypropylene may be mentioned.

The reinforcing effect of fixing the mat 8 to the back side of the N mutual 10 as described above is particularly effective for roof tiles to which a load is applied from above, but it is also effective for other hydraulic inorganic molded products as well. The load-bearing strength is improved.

According to the manufacturing method of the above embodiment, a roof tile with a diameter of 60 (tan, a length of 420 mm and a thickness of 7.5+w+) was manufactured, and a roof tile with no mantle 8 fixed to the back side obtained by the conventional method was manufactured. The load-bearing strength of both was compared.The hydraulic inorganic composition material used was IIhw, which was a mixture of 100 parts by weight of cement, 50 parts by weight of fly ash, and 2 parts by weight of vinylon fiber and 50 parts by weight of water as synthetic fibers.
1 reinforced semen)! [I oxide material was used. Further, as the fiber mat 8 serving as the dehydration filter cloth, a 30-mesh polypropylene mat was used.

The load resistance test was carried out by supporting the roof tile 10 with two support rods 11 and applying a load to the central load point 12 from above, as shown in FIG. The size of load point 12 is 5
It was set to 0x60.

As a result of the load-bearing test, the roof tile obtained in this example had a load-bearing breaking strength of 146 kg, whereas the roof tile obtained by the conventional method had a load-bearing breaking strength of 120 kg. That is, it can be seen that by using the manufacturing method of this example, the load-bearing fracture strength of the roof tile can be effectively increased.

In addition, in the description of the embodiments described above, the dehydration hole plate 6 and the wire mesh 7 are placed on the pressing surface of the lower die 2, but these are not essential components of the present invention. That is, even if the dehydration hole plate 6 and the wire mesh 7 are omitted, if the moisture can be sufficiently discharged into the dehydration channel 5 with only the mat 8 serving as the dehydration filter cloth, even if the dehydration hole plate 6 and the wire mesh 7 are omitted. Alternatively, any one of these may be omitted.

[Effects of the Invention] As described above, according to the present invention, a mat serving as a dehydration filter cloth is charged into a press together with a hydraulic inorganic composition material, and after pressing is fixed to one side of a hydraulic inorganic molded article. In other words, since the dehydration filter cloth is not used repeatedly,
Problems such as poor dehydration caused by clogging of the filter cloth due to repeated use of the dewatering filter cloth and damage to the filter cloth due to product protrusions are solved. Moreover, since the mat serving as the filter cloth for dehydration is simply charged together with the hydraulic inorganic composition material, it can be supplied extremely easily. Therefore, in the conventional method, the complicated work of replacing the dewatering filter cloth every predetermined press cycle was required, but since such work can be omitted, work efficiency is also greatly improved.

In addition, since the mat that becomes the dehydration filter cloth is fixed to one side of the hydraulic inorganic molding, by selecting the material of the mat, the strength against tensile stress of the hydraulic inorganic molding can be increased. This also makes it possible to obtain a hydraulic inorganic molded product with high strength.

[Brief explanation of drawings]

FIGS. 1(a) to (c) are cross-sectional views for explaining a method for manufacturing a hydraulic inorganic molded article according to an embodiment of the present invention,
FIGS. 2(a) to (C) are a cross-sectional view, a perspective view, and a side view of the hydraulic inorganic molded product obtained in the example, respectively;
FIG. 3 is a perspective view for explaining the load-bearing strength test. In the figure, 1 is the upper mold, 2 is the lower mold, 2a is the recess, 2b is the pressing surface, 3 is the press, 5 is the dehydration channel, 6 is the dehydration hole puto, 7 is the wire mesh, and 8 is the mat that becomes the dehydration filter cloth. , 9 indicates a hydraulic inorganic composition material, and 10 indicates a roof tile. Figure 1 a6 Patent applicant Tanemizu Chemical Industry Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] (1) Hydraulic inorganic molding into a desired shape by press dehydration molding of a hydraulic inorganic composition material using a press machine that has an upper mold and a lower mold and has a plurality of dehydration channels opened on the pressing surface. A method for manufacturing an article, characterized in that a hydraulic inorganic molded article having the mat fixed to one side is obtained by pressing the hydraulic inorganic composition material and a mat serving as a dehydration filter cloth together. A method for producing a hydraulic inorganic molded product.