JPH0524025A - Inorganic material extrusion molding die - Google Patents

Abstract

PURPOSE:To enable an obtained extruded object to be provided with sufficient linearity, while the occurrence of the warpage and the crack in the surface of the molded object obtained by improving its moldability, is suppressed. CONSTITUTION:Recessed parts 3 are respectively formed on the inner surfaces of the walls 2a, 2b of both upper and lower sides of an inorganic material- flowing path 2. A plurality of flowing amount regulating blocks 4 are arranged in the recessed parts 3, while they are arranged side by side in the width direction of the flowing path 2. Each block 4 is turned in a vertical plane parallel to the flowing direction of the inorganic material at the end of the inlet-side of the flowing path 2. Each block 4 penetrates both upper and lower walls 2a, 2b from outside, and a turning-and-fixing members 6 which turn separately each block 4 and also can fix the block in a position where it is received in the recessed part 3 and in a position where its free end is projected in the inorganic material-flowing path, are provided. Accordingly, the assurance of the turbulence in the material-flowing path and the increase of extruding pressure due to the turbulence can be suppressed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to cement,
An inorganic water-curable material such as gypsum is used as a main raw material, and a thickener and water are mixed with it, and if necessary, aggregates, fibers, weight-reducing materials, etc. are mixed and the plasticized inorganic material is extruded. The present invention relates to a die used for producing a molded product having a desired shape.

[0002]

2. Description of the Related Art For example, in the extrusion molding of an inorganic cement-based composition, the flow of material inside the inorganic material flow path of the die is complicated, and it is extremely difficult to obtain a uniform molded body. In particular, one die cannot be applied to various materials, because the fluidity changes due to slight changes in material properties due to material composition, water ratio, temperature, kneading degree, and the like. Therefore, it is necessary to manufacture a die according to the characteristics of various materials, but the work is extremely troublesome and the cost is high.

Therefore, in order to solve such a problem, as shown in FIG. 8, both upper and lower walls of the inorganic material flow channel (31) are provided.
(31a) (31b), the recess (32) is formed over the entire width, respectively, a plurality of flow rate adjusting blocks (33) are arranged side by side in the width direction of the flow path (32) in the recess (32). , Each block (33)
However, the part where it protrudes into the material flow path (31) and the recess
There has been proposed an extrusion molding die (30) which is movable between a position housed in (32) and the position (Japanese Patent Laid-Open No. 63-31).
9107). In this die (30), the block (3
The surface on the inlet side of the flow path (31) in 3) is orthogonal to the flow direction of the material. Then, the block (33) in the portion where the flow velocity of the material in the flow channel (31) is high is moved to the protruding position to increase the resistance, and the flow rate of that portion is decreased to reduce the flow rate of the material in the flow channel (31). The flow rate is being adjusted.

[0004]

However, in the conventional die, since the resistance due to the flow rate adjusting block becomes too large, the material flow in the material flow path of the die is disturbed,
This has been a cause of an increase in extrusion pressure, resulting in a marked deterioration of moldability, and formation of wrinkles and cracks on the surface of the obtained extrusion molded product. Moreover, the pressure of the material in the material flow channel becomes too large, and a molded product having the required linearity cannot be obtained. In particular, when the inorganic material includes an elastic material, there is a problem that the springback of the molded body becomes large and the linearity is remarkably deteriorated.

The object of the present invention is to solve the above-mentioned problems, to adjust the flow rate according to the variation of material characteristics, and to have excellent moldability, and to make the surface of the obtained molded article wrinkled. It is an object of the present invention to provide a die for extrusion molding of an inorganic material, which is capable of preventing cracks and the like and not impairing linearity.

[0006]

In an inorganic material extrusion molding die according to the present invention, a recess is formed in an inner surface of an inorganic material flow path, a plurality of flow rate adjusting blocks are arranged in the recess, and each block is The one end is attached to the peripheral wall of the material flow path so as to be rotatable in a plane parallel to the flow direction of the inorganic material, and each block is rotated,
The rotating and fixing means is provided for fixing the position housed in the recess and the position where the free end projects into the inorganic material channel.

[0007]

With the above structure, the flow rate adjusting block can be projected into the inorganic material flow channel in a state of being inclined with respect to the surface in which the recess is formed, thereby adjusting the flow rate of the material. Since the degree of resistance increase at this time is smaller than that of the conventional die, it is possible to suppress the occurrence of flow turbulence in the material flow path and the increase in extrusion pressure resulting from this.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the same parts and the same parts will be denoted by the same reference symbols throughout the drawings, and the description thereof will be omitted.
In the following description, the front of the molded body in the extrusion direction, that is, the right side of FIGS. 1 to 6 is referred to as the front, and the opposite side is referred to as the rear. Also, the lower side of FIGS. 2, 4 and 6 is left,
The opposite side is called the right.

1 and 2 show a first embodiment of the present invention.

In FIGS. 1 and 2, recesses (3) extending in the left-right direction are formed on the inner surfaces of the upper and lower walls (2a) (2b) of the inorganic material channel (2) in the die (1). Has been done. Multiple prismatic flow control blocks in the recess (3) with long front and back
(4) are arranged side by side in the left-right direction. Each block
(4) is a shaft (5) that extends in the left-right direction at its rear end.
Are rotatably attached to the left and right end surfaces of the recess (3) in the walls (2a) and (2b), and can rotate in the vertical plane parallel to the flow direction of the inorganic material, that is, in the plane parallel to the paper surface. You can do it. In addition, each block (4)
a) (2b) is penetrated from the outside, each block (4) is individually rotated, and the position stored in the recess (3) and the front end are projected into the inorganic material flow channel (2). It is provided with a rotating and fixing member (6) which can be fixed at the above position. The rotation and fixing member (6) allows the rotation angle of the block (4) to be freely adjusted and fixed at each position.

With this structure, when the inorganic material is extrusion-molded, as shown by the chain line in FIG. 1, the material is discharged so that the inclination angle with respect to the horizontal plane is an acute angle by the rotating and fixing member (6). The block (4) having a large amount at a predetermined position is rotated so that its front end portion is projected into the material flow path (2). Then, the flow rate of the material flowing through the material flow channel (2) changes, and the material is made uniform throughout. At this time, in the part where the block (4) is projected, the flow path (2) is gradually narrowed toward the front, so that the increase in the pressure is suppressed. Moreover, the disturbance of the material flow can be suppressed.

3 and 4 show a second embodiment of the present invention. In FIG. 3 and FIG. 4, each flow rate adjustment block (4) arranged in the recess (3) of the upper and lower side walls (2a) (2b) of the inorganic material flow path (2) of the die (10) is At the front end, it is rotatably attached to the walls (2a) and (2b) by a shaft (5) extending in the left-right direction, and in a vertical plane parallel to the flow direction of the inorganic material, that is, in a plane parallel to the paper surface. It can rotate.

With this structure, when the inorganic material is extrusion-molded, as shown by the chain line in FIG. 3, the material is discharged by the turning and fixing member (6) so that the inclination angle with respect to the horizontal plane becomes an acute angle. The block (4) at a predetermined position with a large amount is rotated so that its rear end portion is projected into the material flow channel (2). Then, the flow rate of the material flowing through the material flow channel (2) changes, and the material is made uniform throughout. At this time, in the projecting portion of the block (4), the flow path (2) narrows and then gradually widens toward the front, so that the increase in the pressure is suppressed. Moreover, the disturbance of the material flow can be suppressed.

5 and 6 show a third embodiment of the present invention. In FIGS. 5 and 6, the inner surface of the upper and lower side walls (2a) (2b) of the inorganic material flow channel (2) in the die (20) is left and right more than the recess (3) of the first and second embodiments. Direction wide recess (2
1) is respected throughout its breadth. Inside the recess (21), multiple flow rate adjustment blocks (4) lined up in the left-right direction
It is arranged in two rows, front and back. Each block (4) on the front side is
At its front end, a wall (5) extends to the left and right
The recesses (21) in (2a) and (2b) are rotatably attached to the left and right end surfaces. At the rear end of each block (4) on the rear side, a shaft (5) extending in the left-right direction is rotatably attached to the left and right end faces of the recess (21) in the walls (2a) (2b). Installed. Each block (4) can rotate in a vertical plane parallel to the flow direction of the inorganic material, that is, in a plane parallel to the paper surface. In addition, the upper and lower walls (2a) (2b) are penetrated from the outside between the blocks (4) that form a pair in the front and rear,
In addition, the blocks (4) forming each pair can be simultaneously rotated, and at the same time, the positions can be fixed so that the position housed in the recess (21) and the front end can be fixed to the position protruding into the inorganic material flow channel (2). A fixing member (22) is provided.

With this structure, when the inorganic material is extrusion-molded, the material is discharged so that the inclination angle with respect to the horizontal plane becomes an acute angle by the rotating and fixing member (22) as shown by the chain line in FIG. Blocks before and after a given position with a large amount
Rotate (4) at the same time to move the rear end of the front block (4) and the front end of the rear block (4) to the material flow path.
(2) Make it protrude inside. Then, the flow rate of the material flowing through the material flow channel (2) changes, and the material is made uniform throughout. At this time, in the protruding portion of the block (4), the flow path (2) becomes narrower toward the front and then gradually spreads further toward the front, so that the pressure is prevented from rising. At the same time, the turbulence of the material flow is suppressed.

Next, specific experimental examples carried out using the above three extrusion molding dies will be described together with comparative experimental examples.

Inorganic cement composition Ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.) 100 parts by weight Fly ash (manufactured by Kandenka Co., Ltd.) 40 parts by weight Long fiber pulp (pulp manufactured by Kojin Co., Ltd.) 5 parts by weight Methylcellulose (Shin-Etsu Chemical Co., Ltd.) "Metroze 90SH30000") 3 parts by weight Water 40 parts by weight Specific Experimental Example 1 The inorganic cementitious composition was extruded using the die (1) shown in FIGS. 1 and 2, and the cross section shown in FIG. An extruded product (S) having a shape was obtained. The design dimension of the extruded product (S) is such that the thickness of each part of A to E shown in FIG.
m, 20 mm, 30 mm, 20 mm, and 40 mm. At this time, the block (4) corresponding to the central portion in the left-right direction of the molded body (S) was rotated to adjust the flow rate. The rotation angle of the block (4) with respect to the horizontal plane was set to 30 ° as the position where the molded body (S) was obtained in the best condition.

Concrete Experiment Example 2 The cementitious composition used in Concrete Experiment Example 1 was prepared by adding styrene bead foam (“HN4” manufactured by Sekisui Plastics Co., Ltd.), which is an elastic material.
0 ") was added to the material, and a specific experimental example 1 was used.
Extrusion was carried out in the same manner as in.

Specific Experimental Example 3 The above inorganic cementitious composition was extrusion-molded in the same manner as in Specific Experimental Example 1 using the die shown in FIGS. 3 and 4. At this time, the block (4) corresponding to the central portion in the left-right direction of the molded body (S) was rotated to adjust the flow rate. The rotation angle of the block (4) with respect to the horizontal plane is
The position where (S) was obtained in the best condition was set to 30 degrees.

Concrete Experiment Example 4 The cement-based composition used in Concrete Experiment Example 3 was prepared by adding styrene bead foam (“HN4” manufactured by Sekisui Plastics Co., Ltd.) as an elastic material.
0 ") was added to the material, and a specific experimental example 3 was used.
Extrusion was carried out in the same manner as in.

Concrete Experimental Example 5 The above-mentioned inorganic cement-based composition was used to obtain an extruded product having a cross-sectional shape shown in FIG. 7 by using a die shown in FIGS. At this time, at this time, the pair of blocks (4) corresponding to the center of the molded body (S) in the left-right direction is rotated,
The flow rate was adjusted. The rotation angle of both blocks (4) with respect to the horizontal plane was set to 30 ° as the position where the molded body (S) was obtained in the best condition.

Concrete Experiment Example 6 The cementitious composition used in Concrete Experiment Example 5 was prepared by adding styrene bead foam (“HN4” manufactured by Sekisui Plastics Co., Ltd.) as an elastic material.
0 ") was added to the material, and a specific experimental example 5 was used.
Extrusion was carried out in the same manner as in.

Comparative Experimental Example 1 The above inorganic cementitious composition was extruded using a die (30) shown in FIG. 8 to obtain an extruded product (S) having a cross-sectional shape shown in FIG. At this time, the upper and lower blocks (33) corresponding to the central part in the left-right direction of the molded body (S) were respectively projected into the flow path (31) to adjust the flow rate. The protruding length of both blocks (33) was 15 mm.

Comparative Experimental Example 2 The cement-based composition used in Comparative Experimental Example 1 was prepared by adding styrene bead foam, which is an elastic material (“HN4” manufactured by Sekisui Plastics Co., Ltd.).
0 ″) was added in an amount of 3 parts by weight, and extrusion molding was performed in the same manner as in Comparative Experimental Example 3.

Evaluation Test 1 The molded products obtained in the above-mentioned specific experimental examples 1 and 2 were observed for wrinkles and cracks, and the linearity,
The molding pressure and the thickness of each part A to E of the molded body were measured. The linearity was measured by measuring the distance (mm) at which the side end portion of the extrusion-molded body was displaced from the die by 50 cm in front of the die. The results are shown in Table 1.

[0026]

[Table 1]

Evaluation Test 2 For the molded products obtained in the concrete Experimental Examples 3 to 4, the presence or absence of wrinkles and cracks was observed, and the linearity was measured in the same manner as in Evaluation Test 1. The results are shown in Table 2.

[0028]

[Table 2]

Evaluation Test 3 For the molded articles obtained in the concrete Experimental Examples 5-6 and Comparative Experimental Examples 1-2, the presence or absence of wrinkles and cracks was observed, and the linearity, the molding pressure, and each part A of the molded article were observed. ~
The thickness of E and the depth of irregularities on the surface of each portion A to E were measured. The linearity was measured as in Evaluation Test 1. The results are shown in Table 3.

[0030]

[Table 3]

[0031]

As described above, according to the extrusion molding die of the present invention, it is possible to suppress the occurrence of the flow turbulence in the material flow path and the increase in the extrusion pressure resulting from this, so that the moldability is improved. Can be improved. Further, it is possible to prevent wrinkles and cracks from being generated on the surface of the obtained molded body. Furthermore, the moldings obtained have a satisfactory linearity.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a first embodiment of an extrusion molding die according to the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a vertical sectional view showing a second embodiment of the extrusion molding die according to the present invention.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a vertical sectional view showing a third embodiment of the extrusion molding die according to the present invention.

6 is a cross-sectional view taken along the line VI-VI of FIG.

FIG. 7 is a cross-sectional view of extruded products produced in specific experimental examples and comparative experimental examples.

FIG. 8 is a vertical sectional view showing a conventional extrusion molding die.

[Explanation of symbols]

 1 Inorganic Material Extrusion Molding Die 2 Inorganic Material Flow Channel 3 Recess 4 Flow Rate Control Block 6 Rotating / Fixing Member 10 Inorganic Material Extruding Die 20 Inorganic Material Extrusion Molding Die 21 Recess 22 Rotating / Fixing Member

Claims (1)

Claim: What is claimed is: 1. A recess is formed in an inner surface of an inorganic material channel, a plurality of flow rate adjusting blocks are arranged in the recess, and each block has a flow direction of the inorganic material at one end thereof. It is attached to the peripheral wall of the material flow path so that it can rotate in a plane parallel to, and each block is rotated, and the position stored in the recess and the position where the free end projects into the inorganic material flow path A die for extrusion molding of an inorganic material, which is provided with a rotating and fixing means that can be fixed to the.