JP4034161B2 - Extrusion equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The invention of this application relates to an extrusion molding apparatus. More specifically, the invention of this application prevents rapid pressurization of the molded product when patterning the molded product discharged from the discharge port of the extrusion mold, resulting in material stagnation. In particular, the present invention relates to an extrusion molding apparatus that realizes stable and good patterning.
[0002]
[Prior art]
Cement-based inorganic boards are provided as exterior materials for houses and the like. An extrusion molding method is known as one of the manufacturing methods. In the extrusion molding method, a cement-containing material is extruded toward a die placed at the tip using an extruder equipped with an auger screw, and a plate. It is shaped into a shape. Thereafter, the molded product is patterned by a patterning roll disposed in the vicinity of the discharge port of the mold. Such an extrusion molding method has an advantage that a hollow molded product can be continuously produced by disposing a core in a mold.
[0003]
With regard to the above extrusion molding method, the applicant of this application has proposed that an unloading roll be disposed opposite to the patterning roll in order to improve the cuts and dimensional defects of the molded product that are likely to occur during patterning. (For example, refer to Patent Document 1).
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2000-71310
[Problems to be solved by the invention]
However, in the extrusion molding apparatus described in the above patent document, the rotation centers of the patterning roll and the carry-out roll are arranged on the same vertical line with respect to the material flow direction. If the centers of the patterning roll and the unloading roll are in such a positional relationship as a result of subsequent studies, pressure is rapidly applied to the molded product near the discharge port of the mold, and mold release starts immediately after patterning. For this reason, it has been found that the flow of the material is stagnant, and the corners of the convex pattern of the molded product are flipped up by the patterning roll at the time of mold release, and patterning defects are likely to occur.
[0006]
The invention of this application has been made in view of such circumstances, and the molded product is rapidly pressurized when patterning the molded product discharged from the discharge port of the extrusion mold. It is an object to be solved to provide an extrusion molding apparatus that prevents the stagnation of the material and realizes a stable and good patterning without causing material stagnation.
[0007]
[Means for Solving the Problems]
In order to solve the above problems, the extrusion molding apparatus of the invention of this application is provided with a patterning roll on the upper part and a discharge roll on the lower part near the discharge port of the extrusion molding die. The rotation center of each of the patterning roll and the carry-out roll is displaced, the rotation center of the patterning roll is located downstream of the rotation center of the carry-out roll , and does not rapidly pressurize the molded product, It is characterized by feeding forward to release the molded product from the textured roll After depressurization by conveying rolls of material flowing through the lower side of patterning earlier around the outlet of the extrusion die.
[0008]
The extrusion apparatus of the invention of this application, and this the core is disposed in the vicinity of the discharge port in the extrusion molding die, the surface of the out roll is meshed, thereby removing foreign matters mixed into the material , they are respectively as an aspect that you to put the pattern on the back surface of the molded product.
[0009]
Hereinafter, the extrusion molding apparatus of the present invention will be described in more detail with reference to the drawings.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view of an essential part showing an outline of an extrusion molding apparatus according to the invention of this application.
[0011]
In the extrusion molding apparatus of the invention of this application, as shown in FIG. 1, the molded product (3) is located near the discharge port (2) of the extrusion molding die (1), as in the previously proposed extrusion molding apparatus. The patterning roll (4) is provided at the upper part and the carry-out roll (5) is provided at the lower part. Both the patterning roll (4) and the carry-out roll (5) rotate in the direction of feeding the molded product (3) forward of the discharge port (2) of the extrusion mold (1). Therefore, the rotation directions of the patterning roll (4) and the carry-out roll (5) are opposite. The patterning roll (4) has irregularities corresponding to a predetermined pattern on the surface.
[0012]
On the other hand, in the extrusion molding apparatus of the invention of this application, the rotation centers of the patterning roll (4) and the carry-out roll (5) are displaced (x), and the rotation center of the patterning roll (4) is set to the carry-out roll ( It is located downstream of the discharge port (2) of the extrusion mold (1) from the rotation center of 5).
[0013]
Thus, the rotational centers of the patterning roll (4) and the unloading roll (5) are displaced (x), and the rotational center of the patterning roll (4) is extruded from the rotational center of the unloading roll (5). By positioning it on the downstream side of the discharge port (2) of (1), as shown in the enlarged cross-sectional view of the main part of FIG. 2, the upper side in the vicinity of the discharge port (2) of the extrusion mold (1) is The pressure applied to the flowing material (6) decreases, and the rapid pressurization to the molded product (3) can be eliminated during patterning. Moreover, since the material (7) flowing under the discharge port (2) of the extrusion mold (1) is sent forward by the unloading roll (5) before patterning, the material flow (FIG. 2). There is no stagnation in the arrows shown in the figure. Further, since the molded product (3) is released from the patterning roll (4) after being decompressed during patterning, it is easy to release, and the corner of the convex pattern of the molded product (3) as described above. The part is flipped up by the patterning roll (4), and patterning defects do not occur.
[0014]
Thus, in the extrusion molding apparatus of the invention of this application, when the molded product (3) is patterned on the molded product (3) discharged from the discharge port (2) of the extrusion molding die (1), the molded product (3) Rapid pressurization can be prevented, stable material patterning can be realized without causing material stagnation.
[0015]
In addition, the magnitude | size of position shift (x) can be suitably determined according to various conditions, such as a component of a material, a moisture content, the magnitude | size of a patterning roll (4), and a carrying-out roll (5), a shape.
[0016]
Further, in the extrusion molding apparatus of the invention of this application, as shown in FIG. 1, the core (8) can be disposed not only inside the extrusion mold (1) but also as shown in FIG. Thus, it can also arrange | position in the discharge port (2) vicinity of the metal mold | die for extrusion molding (1). When the core (8) is arranged in the vicinity of the discharge port (2) of the extrusion mold (1) in this way, the hollow part inside the molded product (3) formed by the core (8) has a stable shape. In addition, the stagnation of the material flowing under the discharge port (2) of the extrusion mold (1) can be further eliminated by feeding the unloading roll (5).
[0017]
Furthermore, in the extrusion apparatus of the invention of this application, the surface of the carry-out roll (5) can be meshed. By performing the mesh processing, fine irregularities are formed on the surface of the transport roll (5), and foreign matters mixed in the material can be removed compared to the flat surface, and on the back surface of the molded product (3). Can also be patterned, which is effective in improving the appearance of the molded product (3).
[0018]
Of course, the invention of this application is not limited by the above embodiments. It goes without saying that various modes are possible for details such as the diameter and length of the patterning roll and the carry-out roll, and the size of the displacement.
[0019]
【The invention's effect】
As described in detail above, the invention of this application prevents the material from being rapidly pressed when patterning the molded product discharged from the discharge port of the extrusion mold, and the stagnation of the material. And stable and good patterning is realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an outline of an extrusion molding apparatus according to the invention of this application.
FIG. 2 is an enlarged cross-sectional view of a main part showing an outline of an extrusion molding apparatus according to the invention of this application.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Extrusion metal mold 2 Discharge port 3 Molded article 4 Patterning roll 5 Unloading roll 6 Material flowing above the discharge port of the extrusion mold 7 Material flowing below the discharge port of the extrusion mold 8 core

Claims (3)

Near the discharge port of the extrusion mold, the molded product is separated in thickness, and a patterning roll is provided in the upper part, and a carry-out roll is provided in the lower part. The roll center of rotation is positioned downstream of the discharge port from the center of rotation of the unloading roll, so that the material flowing under the discharge port of the extrusion mold is not patterned without rapidly pressing the molded product. An extruding apparatus characterized in that it is fed forward by a conveying roll, and the molded product is released from the patterning roll after decompression .   The extrusion molding apparatus according to claim 1, wherein the core is arranged in the vicinity of the discharge port in the extrusion mold. The extrusion molding apparatus according to claim 1 or 2 , wherein the surface of the carry-out roll is mesh-processed to remove foreign matters mixed in the material and pattern the back surface of the molded product .

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