JP2730832B2 - Extrusion molding method for inorganic building materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extruding an inorganic building material, and more particularly to an improved method for extruding a multilayer inorganic building material by supplying two or more different kneading materials to the same die.

[0002]

2. Description of the Related Art Conventionally, in extrusion molding of inorganic building materials,
A multi-screw extruder having a main extruder for extruding a cement kneaded product in a plate shape, and a sub-extruder for extruding another cement kneaded material in a plate shape toward a die portion of the main extruder, for example, a product In some cases, a product obtained by integrally laminating a main body part constituting the above and a decorative surface layer constituting the surface layer is extruded. The extruded product by such a multi-screw extruder has an advantage that a tough product can be formed without fear of delamination since the main layer and the decorative layer are mutually strongly compressed and discharged inside the base.

[0003]

However, as shown in FIG. 5, the inorganic building material formed by the above-described method has a form in which the main layer A and the decorative layer B are simply laminated, and the end face C thereof is formed.
Has a problem that a boundary between the main layer A and the decorative layer B appears, and particularly in a product such as a roofing material in which an end face is exposed as it is, it is necessary to newly apply a makeup to the end face C later. Was. In the case where the decorative layer B is a waterproof layer, in addition to the problem of appearance, there is a drawback that the step of waterproofing the end face C cannot be omitted, so that the molding is troublesome.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to produce a laminated product using a multi-screw extruder, in which a surface layer is laminated on the product surface and its end face so that post-treatment can be omitted. The purpose of the present invention is to provide a method for extruding a building material.

[0005]

That SUMMARY OF THE INVENTION The extrusion method for the inorganic building material of the invention comprises a main extruder 1A extruding a cement kneaded product S ₁ in a plate shape, the base 2 parts of the main extruder 1A directed, another cement kneaded product S ₂ and a extrusion supplying secondary extruder 1B, inorganic by multiaxial extruder 1 integrally molded while laminating both cement kneaded product S _1, S ₂ in base 2 parts In the extrusion molding method for building materials, the product surface and the widthwise end face inside the die 2 on the discharge side from the kneading material supply section of the sub-extruder 1B are enlarged, and the kneading supplied from the sub-extruder 1B to the enlarged portion. it is characterized in that the molding while Wrapping material S _2.

[0006]

According to the method for extruding an inorganic building material of the present invention, a laminated inorganic building material is extruded by using a conventional multi-screw extruder. The kneaded material extruded from the main extruder is formed. The discharge side of the forming die is enlarged by the thickness of the surface layer over the product surface and the end face in the width direction, and the kneading material from the sub-extruder is wrapped around the gap to form. Accordingly, the kneaded material extruded from the sub-extruder is discharged in a state in which not only the surface layer of the product but also the end face is wrapped, and a product in which all the exposed surfaces are uniformly covered with the surface layer is formed.

[0007]

Next, an embodiment of the present invention will be described. FIG. 1 is a sectional view of a multi-screw extruder for carrying out the method of the present invention,
2 is a perspective view showing a main part of the apparatus shown in FIG. 1, FIG. 3 is a sectional view of a product obtained by the method of the present invention, and FIG. 4 is a sectional view of a product obtained by still another embodiment.

[0008] The main extruder 1A extruding Example 1 the cement kneaded product S ₁ on the plate
If, toward the ferrule 2 parts of the main extrusion devices 1A, another cement kneaded product S ₂ and a extrusion supplying secondary extruder 1B, both cement kneaded product S _1, S ₂ are laminated with base 2 parts In the multi-screw extruder 1 which is integrally formed while forming, the product surface inside the die 2 on the discharge side from the kneading material supply section of the sub-extruder 1B is 6
mm, the end in the width direction is expanded by 6 mm,
The secondary extruder 1B was Wrapping kneaded material S ₂ supplied from extruded, thickness 14mm by T-die, were molded laminated products width 270mm to. Observation of the cross section of the product, as shown in FIG. 3, the surface layer G ₁ is the product that covers integrally to the product main body portion G ₂ end surface is formed.

[0009] The cross-sectional shape of the die 2 for molding a cement kneaded product S ₁ which is extruded from Example 2 Main extruder 1A and isosceles trapezoidal shape, the base 2 to the discharge side of the die 2 was to form a rectangular shape When extrusion molding was carried out in the same manner as in Example 1, a product having a cross section shown in FIG. 4 was formed.

[0010]

As described in the foregoing, according to the method of the present invention, since the molded integrally by Wrapping kneaded material S ₂ to form a surface layer on the portion to expand forming a discharge side of the die 2, delamination In addition, a product having no end surface and wrapped with the same material as the surface layer can be formed, and the subsequent end surface treatment step can be omitted completely, and the effect of mass production of high-quality laminated products at low cost can be exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view of a multi-screw extruder for carrying out a method of the present invention.

FIG. 2 is a perspective view showing a main part of the apparatus of FIG. 1;

FIG. 3 is a sectional view of a product obtained by the method of the present invention.

FIG. 4 is a sectional view of a product obtained according to still another embodiment.

FIG. 5 is a perspective view of a conventional example.

[Explanation of symbols]

S ₁ ... cement kneaded material S ₂ ... another cement kneaded material 1A ... main extruder 1B ... sub-extruder 1 ... multi-screw extruder 2 ... die 3 ... enlarged part

Claims (1)

(57) [Claims] 1. A main extruder 1A extruding a cement kneaded product S ₁ in a plate shape, toward the ferrule 2 parts of the main extruder 1A, extrusion and supplies the sub-extruder another cement kneaded product S ₂ 1
B, and a kneading material supply unit of a sub-extruder 1B in a method of extruding an inorganic building material by a multi-screw extruder ₁ in which both cement kneaded materials S ₁ and S ₂ are integrally formed while being laminated at two bases. mineral building materials, characterized in that more of the base 2 inside the product surface and the widthwise end face portion of the discharge side to expand, forming while Wrapping kneaded material S ₂ supplied from the sub extruder 1B in the enlarged portion Extrusion molding method.