JPH08108425A - Method for extrusion molding hydraulic inorganic material - Google Patents

Abstract

PURPOSE: To obtain an extrusion molding method wherein mass production is possible, production efficiency is high, shape retention is easy and cost is reduced. CONSTITUTION: A method for obtaining a molding comprises a simultaneous extrusion from the same die of a molding and a shape retaining body molded separately therefrom for preventing the deformation of the molding using hydraulic inorganic material, the subsequent combination of the molding and the shape retaining body on a receiving conveyor, cutting of such a combination into a predetermined size and separation of the molding and the shape retaining body after curing. An extruding machine 1 is provided with a die 2 at its end, the die is provided with a base for molding an intended article 3 and another base for molding the shape retaining body 4 for retaining the shape of the article 3. The article 3 and the shape retaining body 4 extruded from the die 2 of the extruding machine 1 are combined on the receiving conveyor 5. After curing, such a combination is separated to obtain the article 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extrusion-molding a hydraulic inorganic material, and more particularly to an extrusion-molding method for a hydraulic inorganic material capable of producing a shaped product which is easily deformed after extrusion without deformation. Regarding the method.

[0002]

2. Description of the Related Art Generally, in order to manufacture a product by extrusion molding with a hydraulic inorganic material, a plastic molded product (raw product) discharged from an extruder is received by a conveyor (corocon or belt) and is made to a fixed length. After cutting, the raw product is transferred to an iron plate, cured and cured to obtain a product. However, in the manufacture of troughs, L-shaped corners, curved corners, etc., there are long vertical surfaces and curved surfaces that are not in contact with smooth receiving iron plates, so deformation such as tipping or chamfering occurs before hardening However, it is not possible to obtain a satisfactory product.

Therefore, conventionally, a method of preparing a shape-retaining body (form) made of wood or steel and directly receiving the raw product extruded from the die of the extruder into the shape-retaining body and curing and curing the shape-retaining method 60- Various molding apparatuses and methods have been developed as seen in Japanese Patent Publication No. 137506, Japanese Patent Publication No. 3-17647, and the like. In the apparatus described in Japanese Utility Model Laid-Open No. 60-137506, there is a proposal for labor saving by mechanically preventing this deformation in an apparatus for manufacturing an extrusion molded product having a concave cross section. 5 to 6, at least the upper conveyor 7A among the conveyors 7A, 7B in which the raw product 3 of the hydraulic inorganic material extruded from the die 2 of the extruder is arranged in two layers vertically. While contacting and supporting the recessed inner surface of the extrusion-molded product with a deformed shape that opens on one side of the cross section,
It is adapted to be transferred to the receiving pallet 8. Moreover, in the method of Japanese Patent Publication No. 3-17647, the bottom surface of the recessed raw product as shown in FIG. 8 is transferred in the process of transferring the raw product in which the hydraulic inorganic material is extruded from the extruder on the receiving belt conveyer. Except for the fact that the entire surface other than the above is fitted with a shape-retaining material 9 that is lightweight and has heat insulation properties, and after cutting to a fixed length, the raw product is cured while being fitted with the shape-retaining material, as shown in FIG. This shape-retaining material is fitted little by little as the raw product 3 moves during extrusion in the process of extrusion, and the raw product is completely fitted to a fixed length, so that deformation of the raw product during transportation is prevented. . Further, as shown in FIG. 9, a rib 32 was formed in advance on the raw product 3 having a desired desired shape, and a die having a shape preventing deformation of the raw product after extrusion was produced and extrusion-molded. There is also a method of receiving a molded product, curing and curing the molded product, and then cutting and processing the rib 32 to obtain the product 3.

[0004]

However, in the above-mentioned technique, the method of directly receiving and curing and curing the raw product extruded from the die of the extruder into the shape-retaining body has many aspects that rely on human hands. If the shape of changes,
This is a method that cannot be adequately applied to mass production of many types, such as the shape of the shape retainer must be changed. In addition, actual development 60-1
In the device of No. 37506, since the conveyer conveyor receives the concave shape of the molded body or the inner shape of the gate shape or the arch shape, it has to have a two-stage (7A, 7B) conveyor, and the structure is complicated. In addition to the above, there is a problem that it is necessary to change the upper conveyor depending on the type of product to be manufactured. Further, Japanese Patent Publication No. 3-17647 has been made in order to solve such a problem. As shown in FIG. 7, this shape-retaining material moves as the raw product 3 moves during the extrusion process. It is preferable in that the raw product will be fitted with a fixed length and it will be completely fitted, and the deformation during transportation of the raw product will be prevented, but the shape retention material is an organic material such as Styrofoam. Not only is assumed, but in actual manufacturing, a large amount of shape retention material is required, and even if it can be reused several times, its running cost will be large, and the shape retention material that cannot be reused The problems associated with mass production, such as the processing of materials, cannot be overlooked. Furthermore, the method shown in FIG. 9 is not suitable for mass production because the rib 32 is cut, and this cutting is troublesome.

Therefore, as a result of various studies on the above-mentioned problems, the inventors of the present invention not only maintained the shape of the generative product,
Mass production is possible with a simple structure and high production efficiency,
Further, they have found that an extrusion molding method that can reduce the cost is possible by using a material of the same quality as the shape-retaining material, and thus accomplished the present invention. Therefore, the problem to be solved by the present invention is, in extrusion molding of a hydraulic inorganic material, not only the shape-retention of a molded product but also mass production with a simple structure, and good production efficiency. An object of the present invention is to provide an extrusion molding method capable of reducing the cost by using the same material as the shape material.

[0006]

The problems to be solved by the present invention are achieved by the following inventions. (1) Using a hydraulic inorganic material as a forming raw material, a molded product and an independent green body for preventing the deformation of the molded product are simultaneously extruded from the same die, and then these are molded on a receiving conveyor. A method of extrusion molding a hydraulic inorganic material, characterized in that a molded product and a raw shaped body are united, then cut to a fixed length, and after curing and curing, the shaped product and the shaped body are separated to obtain a shaped product. . (2) The extrusion molding method for a hydraulic inorganic material as described in the above item 1, characterized in that a release agent is applied to the contact surface between the green shaped product and the green body.

The present invention will be described in more detail below. In the extrusion molding method for a hydraulic inorganic material according to the present invention, a molded product having a desired product shape and an independent life insurance for preventing deformation of the molded product are provided. The shape is extruded simultaneously from the same die, the green shape is immediately received by a receiving conveyor, the formed shape is combined with the green shape at a position slightly away from the die, cut to a fixed length, and then transferred to a curing iron plate. It is a method of curing by curing and separating the product from the shape retainer. By this, when extrusion molding of hydraulic inorganic material, the product has a complicated shape such as concave shape, gate shape, L shape, curved shape, etc. For example, the product that is easily deformed after extrusion molding can be extruded with high production efficiency without using a complicated and complicated receiving device or shape retainer with low economic efficiency. The shape is not good Things, are possible mass production with a simple structure and good production efficiency, further using a same material as the shape-retaining material, in which an excellent effect that it is possible to measure the decrease cost.

The hydraulic inorganic material used in the present invention is a material containing cement as a main component, which is usually used in this technical field, but is not particularly limited as long as it falls within the range of the hydraulic inorganic material. Not a thing. In the extrusion molding method of the hydraulic inorganic material of the present invention,
After the curing and curing of the green molded product and the molded product, the molded product is taken out to obtain a product.In order to facilitate the separation of the molded product and the molded product, the molded product and the molded product are separated. It is preferable to apply a release agent to the contact surface, and as a method for applying this, an appropriate method such as coating or spraying is adopted. Preferred is spraying. The release agent is not particularly limited and may be a commonly used one,
What is used for molding a hydraulic inorganic material is preferable.
As the release agent, peeling oil is particularly preferable, and as the peeling oil, kerosene or the like is preferable. The peeling oil is sprayed on the surface of the raw shape-contacting body that contacts the raw product. Further, as the die (die) used in the present invention, when the same die is used so that the formed product and the raw shaped body are simultaneously extruded, the forming die of the formed shaped item and the forming die of the raw shaped body are combined. In some cases, any of these may be used. It is preferable to use the former one die for forming the forming die for the green shaped product and the molded product.
Since the raw shape retainer obtained by the extrusion molding method of the hydraulic inorganic material of the present invention is formed of the same material as the molded product, the shape retainer separated after curing is finely pulverized to form one of the hydraulic inorganic materials. It can be reused as a department and is effective as a resource conservation.

[0009]

According to the present invention, the raw product and the raw shaped body are completely extruded by simultaneously extruding the shaped shaped article and the raw shaped body from the same die, and then combining the produced shaped article and the raw shaped body on the receiving conveyor. In addition to the fact that the contact surface of them can be manufactured with a mating shape, and the cross-sectional shape of the green shape has a shape that is difficult to be deformed, a sufficient effect is exhibited to prevent deformation of the raw product even after the two are combined. To do. Further, the application of the release agent on the contact surface between the green shaped product and the raw shaped body can facilitate the separation of both after curing and curing. Since the release oil sprinkled on the surface of the live shape contacting the raw product is present on the surface without penetrating to the inside by the water contained in the raw shape formation and the raw product, the hydration hardening of the raw shape formation and the raw product is prevented. Do not block. Further, the peeling oil will eventually evaporate into the air due to the exothermic action in the curing step after extrusion molding, but the separation of the product can be achieved very conveniently. If this release oil is not sprayed, the molded product will be difficult to separate after curing,
When separating, if the product and the shape retainer are partly in close contact with each other, troubles are likely to occur. Further, after curing the product obtained by combining the green shaped product and the raw shaped body, the separated shaped body can be finely pulverized and reused as a part of the hydraulic inorganic material, which is also effective as a resource saving.

[0010]

Embodiments of the present invention will now be described in more detail with reference to the drawings, but the present invention is not limited to these embodiments.

Embodiment 1 FIG. 1 is a schematic sectional view showing an extruder for producing an extrusion-molded article having a concave cross section according to the present invention. In FIG. 1, a die 2 is attached to the tip of an extruder 1. The die 2 is provided with a die 31 for forming a desired raw product 3 and a die 41 for forming a raw shaped body 4 for performing shape retention of the raw product 3. The raw product 3 and the raw shaped body 4 extruded from the die 2 of the extruder 1 are united on the receiving conveyor 5 and are attached together by the pressing roller 6. When the raw product 3 and the raw shaped body 4 are united, peeling oil is automatically sprayed on the surface of the raw shaped body 4. This is to facilitate the separation of the combined product after curing and curing.

FIG. 2 is a sectional view showing a die used in the present invention. FIG. 2 (a) shows a die having a raw product die 31 and a raw shape die 41, and FIG. (B) shows the shape and positional relationship between the raw product and the shape retainer immediately after being extruded from the die 20. FIG. 3 is a cross-sectional view showing a state after the raw product 3 and the raw shape retainer 4 are combined.

The extrusion molding method of the hydraulic inorganic material of the present invention will be described below using the die 20 shown in FIG. 2 (a). In the conventional method, the hydraulic inorganic material composed of cement is used as a reinforcing material and methyl cellulose. A kneading material is formed by adding a thickener and the like and kneading with water, and the kneading material is put into the extruder 1. The raw product 3 having a concave cross section is extruded from the die 20, and at the same time, the raw shaped body 4 is extruded. At this time, the release agent is sprayed immediately after the raw shaped body 4 is obtained. Then, as shown in FIG. 1, the two are continuously combined on the receiving conveyor 5. Then, the pressing roller 6 attaches the both. By this method, the raw product 3 having a concave cross section has a wall thickness of 10 mm,
As a result of manufacturing a product having a leg length of 250 mm and a bottom width of 200 mm, it was possible to manufacture a concave product 3 with good dimensional accuracy without the shape of the cured product being distorted.

Example 2 Using the extruder 1 shown in FIG. 1, in the same manner as in Example 1, molding into a shape as shown in (a), (b), (c) and (d) of FIG. A product having an L-shaped cross section or a curved cross section was manufactured. All of the obtained molded products could be efficiently manufactured without breaking the shape. Needless to say, when a product having a curved cross section is extruded, a roller having a sectional shape of the pressing roller 6 similar to the curved surface of the product is used.

[0015]

As described above, according to the extrusion molding method of the present invention, not only the shape of the molded product can be maintained, but also the mass production is possible with a simple structure, the production efficiency is high, and the storage efficiency is further improved. By using a material of the same quality as the shape member, the excellent effect that the cost can be reduced can be achieved. That is, a product which is easily deformed after extrusion molding of a product having a concave or L-shaped cross section, a gate shape or a curved shape is used without using a receiving device or a shape retaining material with low economical efficiency. By simply providing the die for forming the shape retainer together with the die for forming the product on the die, it is possible to efficiently form a product having a stable and stable cross-sectional shape as in the case of manufacturing a normal flat panel, for example. Therefore, the obtained molded product can economically widely provide a protective storage trough for cables for railways, electric power, etc.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an extruder used in the present invention.

FIG. 2 is a cross-sectional view showing a die used in the present invention,
(A) is a die having two types of die in the same die, and (b) is a die having each die in separate dies.

FIG. 3 is a cross-sectional view showing a state in which a green shaped product and a raw shaped body are combined.

FIG. 4 is a cross-sectional view showing another embodiment of the shapes of the molded product and the shape retainer molded by the present invention.

FIG. 5 is a cross-sectional view showing a conventional extruder.

FIG. 6 is a cross-sectional view showing a conventional extrusion molding method.

FIG. 7 is a cross-sectional view showing another example of a conventional extrusion molding machine.

8 is a cross-sectional view showing a state of a molded product and a shape retainer obtained by the extrusion molding machine of FIG.

FIG. 9 is a cross-sectional view showing a molded product obtained by a conventional extrusion molding method, in which a shows a rib portion to be cut and rejected when a gate-shaped product is produced, and B is an L-shaped product. The rib portion to be cut and rejected is shown. (Each shaded area)

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Extruder 2,20,21,22 Die 3 Produced product such as concave shape, gate shape, L shape, arch shape 31, 41 Die 32 Rib 4 Life shape body 5 Receiving conveyor 6 Pressing roller 7A, 7B Conveying conveyor 8 Receiving pallet 9 Shape retention material

Claims (2)

[Claims] 1. A production raw material and an independent green body for preventing deformation of the production raw material are simultaneously extruded from the same die by using a hydraulic inorganic material as a forming raw material, and then on a receiving conveyor. Extrusion of a hydraulic inorganic material characterized by obtaining a molded article by separating the molded article and the shape retainer after uniting these generated shaped articles and the raw shape retainer, then cutting to a fixed length, and curing and curing. Molding method. 2. The extrusion molding method for a hydraulic inorganic material according to claim 1, wherein a mold release agent is applied to the contact surface between the molded product and the raw shape retainer.