JPH03219918A - Method for patterning extrusion-molded body - Google Patents

Abstract

PURPOSE:To easily produce growth ringlike pattern on the surface of a molded body and make the simultaneous manufacturing of a plurality of the molded bodies possible by a method wherein extrusion-molded body is formed by charging pattern forming sub-stock consisting of pigment together with main stock from a stock charging part ad, after that, sliced in a plurality of layers so as to produce sheet-like molded bodies. CONSTITUTION:In addition to the main stock charging hopper of a screw extruder, its pattern forming stock charging hopper 2 is provided. Outside the mouthpiece 6 of the extruder, a slicing device 8, which slices green sheet of extrusion-molded body 7 before hardening, is provided so as to slice the body 7 into two sheets of sheet-like molded bodies 9. Main stock consists of clay, kaolin, feldspar and water and is charged to a stock charging hopper after they are dry-mixed and wet-kneaded. Sub-stock consists of in-mixing pigment and is charged from a sub-stock charging hopper. In the cross-section of the molded body 7, growth ringlike pattern is seen, while its outer appearance is the same as what is molded out of only the main stock.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for patterning an extruded body.

More specifically, the present invention relates to a technique for patterning the surface of ceramics, cement building materials, etc. manufactured by extrusion molding.

[Prior Art 1 Extrusion molding has been widely used as a method for manufacturing building materials and the like. This method is suitable for uniformly manufacturing molded bodies having the same cross-sectional shape. Further, by changing the shape of the cap, it is possible to manufacture molded bodies with various cross-sectional shapes, and the length can also be arbitrarily selected.

In this molding method, increasing the extrusion molding speed may be considered in order to improve manufacturing efficiency, but increasing the speed may cause defects such as cracks in the molded product, so there is a limit to increasing the molding speed. .

In the current state of extrusion molding technology, the present applicant and many others have proposed patterning the surface of an extruded product using various methods.

The conventional patterning method was to mechanically press, for example, a pattern onto the molded object near the extrusion die, which required a huge amount of equipment and equipment modification. .

[Problems to be Solved by the Invention] The present inventors solved the above-mentioned conventional problems and simply added simple equipment to the existing equipment, thereby making it possible to easily add patterns to the surfaces of building materials. It becomes possible to do so.

■Productivity can be improved by increasing molding speed.

Such a new method was disclosed in Japanese Patent Application No. 1-320553 [
He proposed that coloring and patterning using an extrusion molding machine is a method.

Furthermore, the present inventors conducted research on the behavior of the inorganic plastic material, which is the molded article of the present invention, in an extrusion molding machine using a screw extruder, and took out the plastic material and examined its density distribution and orientation. . As a result, they found that the density increases from the center toward the outer periphery, and that the orientation is "helical", perhaps due to the characteristics of screw extrusion.

Based on these findings, we conducted extensive research into methods for patterning extruded products, and as a result, we discovered a completely new method.

An object of the present invention is to provide a method for patterning this extruded product.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, and employs the following method. That is, a pattern-forming auxiliary material consisting of pigment is charged in parallel and uniformly with the main raw material from the raw material charging port to form an extrusion molded body of the raw material, and the extruded molded body is sliced into multiple layers to be molded into multiple plate shapes. This is a method for patterning an extrusion molded body, which is characterized by forming a plate-shaped body and causing a mixed pattern of main raw materials and auxiliary raw materials to appear on the sliced surface of the plate-shaped molded body.

[Function 1] According to the present invention, the pattern is formed inside the molded body and not on the surface of the molded body. This is because, during extrusion molding of raw materials, the density of the extruded product increases from the center to the outer periphery, and the main raw material and pattern-forming auxiliary materials are completely mixed in and around the high-density outer periphery. I can't make a pattern because it's done. In addition, the main raw material and the pattern-forming auxiliary raw material are not completely mixed in and around the center where the density is low, making it possible to form a tree ring-like pattern on the cross section of the molded product (vertical surface of the die). By slicing the molded product into multiple layers, it is possible to form a wood-grain pattern or a board-grain pattern on the sliced surface depending on the location. This pattern can be changed by changing the screw extrusion speed.

Note that this pattern cannot be clearly seen immediately after extrusion molding, but in the case of ceramic building materials, it can be confirmed by firing.

The present invention also improves productivity by increasing the number of sheets to be sliced, and also allows products with patterns formed on only one side and those with patterns formed on both sides to be obtained. By combining them, it is expected that they can be used in a variety of ways.

[Example 1] Fig. 1 is an explanatory side cross-sectional view of an extrusion molding machine that can suitably carry out the method of the present invention, and has been conventionally used. In addition to the raw material charging hopper (main raw material charging hopper) (1) of the screw extruder, the patterned figure shows an example in which one raw material charging hopper (auxiliary raw material charging hopper) 2 is provided.

FIG. 2 shows a perspective view of the vicinity of the mouthpiece 6 of the extrusion molding machine shown in FIG. 1. A slicing device 8 is provided outside the mouthpiece 6 of the screw extruder for slicing the green plate of the extrusion molded product 7 while it is still soft, and the state is shown in which it is sliced into two plate-shaped molded products 9.

The main raw materials are viscosity 36% by weight, pottery stone 15% by weight, feldspar 32%
After dry mixing and wet mixing for 20 minutes each, the main raw material charging hopper 1 of the extrusion molding machine was charged to the raw material charging hopper 5 via the belt conveyor 3. . Further, as the auxiliary raw material, a commercially available pigment for kneading (blue) was used as it was, and was charged from the auxiliary raw material charging hopper 2 to the raw material charging hopper 5 via the charging blade 8.

In this case, when charging the raw materials, the speed of the belt conveyor 3 and the rotation of the auxiliary raw material charging blades 8 are adjusted so that the main raw material and the auxiliary raw material are charged at a uniform speed.

As shown in FIG. 3, the molded product 7 molded using the apparatus shown in FIG. It didn't change. The cross-sectional dimensions of this molded body 7 were a = 28 mm b = 292 mm, and this was sliced as shown in Fig. 2 to form two plate-shaped molded bodies 9, which were dried and fired.

As shown in FIGS. 4 and 5, the plate-shaped molded body 9 after firing
The wood grain pattern was clearly visible due to the color development of the kneading pigment.

In the present invention, an example was explained in which one auxiliary material charging hopper was provided and the extruded product was sliced into two pieces in the thickness direction.
The present invention is not limited to this, and by using a plurality of auxiliary material charging hoppers 2, it is possible to form even more diverse patterns, and it is also possible to increase the number of slices.

When the number of slices is increased to two or more, some products have a pattern formed on only one side, while others have a pattern formed on both sides.This, together with the addition of the auxiliary material charging hopper 2, results in molded products with various patterns. It becomes possible to manufacture

[Effect of the invention 1] The present invention makes it possible to easily create a tree-ring-like pattern on the surface of a molded product by simply adding a simple auxiliary material charging device and a slicing device for the extruded product to a conventional screw extruder. Furthermore, since a plurality of molded bodies can be manufactured at the same time, the productivity of molded bodies can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory side cross-sectional view of an extrusion molding machine that can suitably carry out the present invention, FIG. 2 is a perspective view of the vicinity of the mouthpiece of the extrusion molding machine shown in FIG. FIGS. 4 and 5 are explanatory diagrams of the patterns formed on the sliced surface of the plate-shaped molded body. 1--Main raw material charging hopper 2--Auxiliary raw material charging hopper 3--Belt conveyor 4--Charging vane 5--Raw material charging hopper 6--Clip 7--Molded body 8- ...Slicing device 9...Plate-shaped compacts a, b--Dimensions Applicant: Mitsubishi Mining and Cement Co., Ltd. Agent
Patent Attorney Yoshio Kosugi Figure 4 Figure 4

Claims (1)

[Claims] 1. A pattern-forming auxiliary material consisting of a pigment is charged in parallel and uniformly with the main material from the material charging port to form an extrusion molded product of the raw material, and the extrusion molded product is sliced into multiple layers to form a plurality of plate shapes. 1. A method for patterning an extrusion molded product, which comprises molding a molded product and causing a mixed pattern of a main raw material and an auxiliary raw material to appear on a sliced surface of the plate-shaped molded product.