JPH10119017A - Manufacture of extrusion-molded plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain extrusion molded plates having no danger of yielding deformation even when being transferred in an uncured state or being placed on a receptacle plate, and improve the quality of extrusion molded plates. SOLUTION: The manufacture of extrusion molded plates is to receive and then transfer extrusion-molded raw plates 33 from a metal piece 31 on a first conveyor 45. In this case, a smoothly-surfaced endless belt 43 is put in close contact with the surface of the raw plate 33 extruded iron the metal piece 31 and moved at a predetermined distance at the same speed as that of the raw plate 33 extrusion. Also, as the raw plate 33 is placed on a receptacle plate 49 from the first conveyor 45, the endless belt 43 is separated from the raw material plate 33 transferred on the receptacle plate 49.

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 a molded plate used for an outer wall of a building or the like using a hydraulic material such as cement. This is to improve the linearity in the extrusion direction.

[0002]

2. Description of the Related Art One of the methods of manufacturing a molded plate used for an outer wall of a building is a method of obtaining an extruded plate by kneading and extruding a hydraulic material such as cement with a reinforcing fiber, an admixture or the like. There is. The production of this extruded plate is performed by using an extruder shown in FIG. 4, and by rotating a screw 1 disposed in a pressure feed path, a hydraulic material or the like is pressure-fed to a discharge pipe section 3,
By extruding a hydraulic material or the like from the base 5 provided at the tip of the discharge pipe section 3, a raw plate 7 having the same cross-sectional shape as the opening shape of the base 5 is formed. The raw plate 7 is conveyed on the first conveyor 9 for a fixed distance, and when reaching the end of the first conveyor 9, is placed on the receiving plate 13 at a junction with the second conveyor 11. The raw plate 7 placed on the receiving plate 13 becomes an extruded plate through primary curing, autoclave curing, and a finishing process.

[0003]

In the manufacture of the above-mentioned extruded plate, the receiving plate 1 has a maximum length of the extruded plate to be manufactured.
3, the receiving plate 13
Cannot be conveyed on the first conveyor 9, and the raw plate 7 cannot be directly received by the receiving plate 13. for that reason,
In the conventional manufacturing method, until it is received by the receiving plate 13,
The raw plate 7 must be transferred in an uncured state, and furthermore, a step 1 is provided at the transfer portion between the first conveyor 9 and the receiving plate 13.
4, the raw plate 7 has, for example, a crushed deformation a shown in FIG.
In addition, there is a problem that the meandering deformation b occurs on the first conveyor 9 shown in FIG. In particular, in the case of an extruded plate requiring flat smoothness, if the above-described transfer in the uncured state causes the sag deformation c of the hollow portion 15 as shown in FIG. Even in the case of the sagging deformation, a streak-like line is visible along the hollow portion 15 when viewed from the surface of the molded plate, which may impair the appearance of the building. Then, when coating is applied to the formed plate having the lines, there is a problem that the lines become more noticeable depending on the type of the paint (glossy, glossy, etc.). In order to prevent such inconvenience, the formed plate after the autoclave curing has to be subjected to surface grinding until the drooping of the hollow portion becomes inconspicuous, and the production cost is increased. In addition, since the thickness of the formed plate itself becomes thinner than a specified thickness due to the surface grinding, it is necessary to add a grinding allowance at the time of the extrusion forming, thereby increasing the manufacturing cost. The present invention has been made in view of the above circumstances, and provides a method of manufacturing an extruded plate in which a raw plate is not deformed by transfer in an uncured state or transfer to a receiving plate. The purpose is to improve the quality of the board.

[0004]

According to the present invention, there is provided a method for manufacturing an extruded plate, comprising: receiving a raw plate extruded from a die onto a first conveyor and transferring the plate; In the method, an endless belt formed with a smooth surface is brought into close contact with the surface of the raw plate extruded from the die and moved a predetermined distance at the same speed as the extrusion speed of the raw plate. is there. Further, the method for manufacturing an extruded plate is such that, after receiving and transferring the raw plate on a first conveyor, a receiving plate transferred by a second conveyor arranged parallel to the first conveyor below the first conveyor. In a method for manufacturing an extruded plate on which the raw plate is transferred,
The endless belt may be separated from the raw plate transferred to the receiving plate. Further, the method for producing an extruded plate may be characterized in that a release agent is applied to the surface of the endless belt that is in close contact with the raw plate.

In this method of manufacturing an extruded plate, an uncured green plate immediately after extrusion molding is conveyed in close contact with an endless belt, and the molded shape is held in a stable state.
Also, when the raw plate is transferred from the first conveyor onto the receiving plate, the endless belt is peeled off when the raw plate is transferred to the receiving plate and becomes less likely to be deformed. The raw plate is protected from the external force generated. Further, when the release agent is applied to the endless belt, the endless belt is easily peeled, and the raw plate is not deformed at the time of peeling.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a method for manufacturing an extruded plate according to the present invention will be described below in detail with reference to the drawings. FIG. 1 is a partially cutaway side view of an extrusion molding apparatus for carrying out a method of manufacturing an extrusion molded plate according to the present invention, FIG. 2 is an enlarged view of a main part of the apparatus shown in FIG. 1, and FIG. It is a front view of the raw board in the state which attached the endless belt. The extruder 21 has an extruder 23 having a pressure feed passage therein, and a discharge pipe 25 is connected to a tip of the extruder 23.

[0007] The extruder 23 rotates a screw 27 located in the pressure feed path to discharge a raw material 29 obtained by kneading a reinforcing material, an admixture, and the like with a hydraulic material such as cement supplied from a hopper (not shown). To section 25. A base 31 is provided at the tip of the discharge pipe section 25, and the base 31 has, for example, a rectangular extrusion opening which is long in a direction perpendicular to the paper surface of FIG. A middle ball 35 is provided inside the base 31, and a hollow portion 37 having the same cross-sectional shape as the middle ball 35 can be formed in the raw plate 33. Accordingly, the hydraulic material 29 extruded from the base 31 is extruded and formed as a raw plate 33 having a rectangular cross section with a hollow portion formed therein.

At the top end of the base 31, a belt introduction hole 39 is provided.
The belt introduction hole 39 communicates the outside with the inside of the base 31. A pressing roller 41 is provided on the upper wall portion of the base 31 on the tip side from the belt introduction hole 39, and the pressing roller 41 is rotatable around a rotation axis perpendicular to the paper surface. Also, the pressing roller 41
Exposes the lower periphery to the inside of the base 31.

A smooth endless belt 43 having substantially the same width as the raw plate 33 is inserted into the belt introduction hole 39 from the outside. The endless belt 43 is made of a flexible material such as a rubber material, and has a smooth contact surface with the raw plate 33. The endless belt 43 has guide portions 43a, 43a formed at both ends in the width direction of a surface that comes into contact with the raw plate 33, and the guide portions 43a, 43a sandwich both end surfaces of the raw plate 33. There may be.

The endless belt 43 entering from the belt introduction hole 39 bends along the outer periphery of the pressing roller 41,
The raw plate 33 is sent out from the base 31 in the pushing direction. Therefore, the raw plate 33 extruded from the base 31 together with the endless belt 43 has an endless belt 4 on its upper surface as shown in FIG.
3 will be extruded in a state of being brought into close contact.

A release agent application device 44 is provided on the peripheral circuit of the endless belt 43, and the release agent application device 44 applies a release agent to the raw plate contact surface of the rotating endless belt 43. .

A first conveyor 45 constituting a conveying path for the raw plate 33 is provided forward of the die 31 in the raw plate pushing direction. Below the first conveyor 45, a second conveyor 47 parallel to the first conveyor 45 is provided. The first conveyor 45 is arranged at a predetermined distance from the base 31 so that the terminal end is close to the second conveyor 47. That is, the first conveyor 45 can transfer the raw plate 33 to the second conveyor 47. The receiving plate 49 is transported to the second conveyor 47 in synchronization with the transport of the raw plate 33, and the raw plate 33 is placed on the receiving plate 49 at the junction of the first conveyor 45 and the second conveyor 47. It is delivered to the second conveyor 47 in a state where it is in a state of being moved.

The above-mentioned endless belt 43 has a peripheral circuit formed by a plurality of guide rollers 51, and at least the raw plate 33 extruded from the base 31 is supported by a receiving plate 49.
A peripheral circuit is formed so as to be in close contact with the surface of the raw plate 33 until it is placed on the upper surface.

Next, the extrusion molding apparatus 2 constructed as described above
1 will be described. The extruder 21 rotates the screw 27 of the extruder 23 to feed the raw material 29 to the discharge pipe 25, and extrudes the fed raw material 29 from the base 31 as a raw plate 33. At this time, the endless belt 43 orbits in synchronization with the material extrusion speed of the extruder 23, and enters from the belt introduction hole 39 with the release agent applied to the contact surface by the release agent application device 44. The pressing roller 41 presses the endless belt 43 against the raw plate 33 with a predetermined pressing force at the outlet of the base 31. The endless belt 43 pressed against the raw plate 33 by the pressing roller 41 is pushed out from the base 31 in a state of being in close contact with the upper surface of the raw plate 33.

The raw plate 33 moves on the first conveyor 45 with the endless belt 43 in close contact therewith.
At the end of 5, it is placed on the receiving plate 49 transferred to the second conveyor 47. At this time, the endless belt 43 is still moving in close contact with the raw plate 33. Receiving plate 49
The raw plate 33 placed on the base plate 33 is moved by a predetermined distance to generate a predetermined strength by curing, and the lower surface is placed flat on the receiving plate 49, so that the shape is stable and the deformation is less likely to occur. . At this point, the peripheral circuit of the endless belt 43 changes its direction in a direction away from the raw plate 33, and is separated from the surface of the raw plate 33.

The raw plate 33 peeled off from the endless belt 43 enters a curing chamber, and after curing for a predetermined time, undergoes an autoclave curing and a finishing step to become a finished extruded plate.

According to the manufacturing method of this embodiment, the raw plate 33 is conveyed in a state where the smooth endless belt 43 is in close contact with the raw plate 33, and the raw plate 33 is placed on the receiving plate 49 when the deformation becomes less likely to occur. Since the belt 43 is peeled off from the raw plate 33, it is possible to prevent deformation immediately after extrusion molding and to stabilize the shape of the raw plate 33 (obtain a curing action). As a result, deformation can be eliminated, and the quality of the extruded plate can be improved. In addition, since the release agent is applied to the endless belt 43 by the release agent application device 44,
The endless belt 43 can be easily separated from the raw plate 33, and deformation of the raw plate 33 at the time of separation can be prevented.

In the above-mentioned endless belt 43, a rubber material is used as a material, but other materials are as follows.
A resin material, a paper material, or the like may be used as long as the durability and the releasability can be sufficiently secured.

[0019]

Next, the results of actual measurement of the accuracy of the extruded plate manufactured by actually performing the conventional method of manufacturing an extruded plate and the method of manufacturing an extruded plate according to the present invention are shown in Table 1.
It will be described based on. The raw materials used for the extrusion were ordinary Portland cement, reinforcing fibers (pulp, alkali-resistant glass fibers), silica sand, and methyl cellulose, which were kneaded with water. The extrusion method shown in FIG. 1 was used in the manufacturing method according to the invention. In addition, in the conventional manufacturing method,
The extruder shown in FIG. 4 was used. The shape of the raw plate was 60 mm thick × 600 mm wide × 4000 mm long. The measurements were crushing deformation (see FIG. 5), sagging deformation (see FIG. 7), and meandering deformation (see FIG. 6) after the raw plate was received on the receiving plate.

[0020]

[Table 1]

As can be seen from Table 1, as a result of performing the extrusion molding three times in each of the working example and the conventional example, in the working example, no crushing deformation occurred and no sagging deformation occurred in one specimen.
While 1 mm was observed and meandering deformation was 1 mm in one specimen, in the conventional example, crushing deformation occurred in all the specimens, and sagging deformation was 0.7 mm at the maximum. Deformation was also observed at a maximum of 6 mm. Thus, it was found that the manufacturing method according to the example is clearly less deformed than the conventional method.

[0022]

As described in detail above, according to the method of manufacturing an extruded plate according to the present invention, the raw plate is conveyed while the endless belt is in close contact with the plate, thereby preventing deformation immediately after extrusion molding. As a result, the shape of the raw plate can be stabilized. As a result, deformation can be eliminated, and the quality of the extruded plate can be improved. Also, when the raw plate is transferred from the first conveyor onto the receiving plate, the endless belt is peeled off when the raw plate is transferred to the receiving plate and deformation is less likely to occur. The resulting deformation can be prevented. Furthermore, if a release agent is applied to the endless belt, the endless belt can be easily peeled off, and the deformation of the raw plate at the time of peeling can be prevented.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an extrusion molding apparatus for carrying out a method for producing an extrusion molded plate according to the present invention.

FIG. 2 is an enlarged view of a main part of the apparatus shown in FIG.

FIG. 3 is a front view of a raw plate in a state where a smooth endless belt is adhered to the surface.

FIG. 4 is a side view showing a schematic configuration of an extrusion molding apparatus that performs a conventional method.

FIG. 5A is a front view of an extruded plate in which crush deformation has occurred;
It is an explanatory view showing the enlarged portion in (B).

FIG. 6 is a plan view showing an extruded plate having meandering deformation.

FIG. 7A is a front view of an extruded plate in which sagging deformation has occurred.
It is an explanatory view showing the enlarged portion in (B).

[Explanation of symbols]

 31 base 33 raw plate 43 endless belt 45 first conveyor 47 second conveyor 49 receiving plate

Claims (3)

[Claims] 1. A method of manufacturing an extruded plate for transferring a raw plate extruded from a die onto a first conveyor and transferring the raw plate extruded from the die to an endless belt having a smooth surface. A method for producing an extruded plate, wherein the raw plate is moved by a predetermined distance at the same speed as the extrusion speed of the raw plate in close contact with the surface. 2. After receiving the raw plate on a first conveyor and transferring the raw plate, the raw plate is transferred onto a receiving plate transferred by a second conveyor arranged in parallel with the first conveyor below the first conveyor. The method for manufacturing an extruded plate according to claim 1, wherein the endless belt is peeled from the green plate transferred to the receiving plate. 3. The method according to claim 1, wherein a release agent is applied to a surface of the endless belt that is in close contact with the green plate.