JP2556758B2 - Inorganic board extrusion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus for extruding an inorganic plate containing a hydraulic inorganic material as a main component.

[Conventional technology and its problems]

Conventionally, as a method of extruding a hydraulic inorganic material with an extrusion molding machine, an extrusion cylinder, a nozzle for gradually reducing the cross-sectional area of the cylinder, and a die suitable for a molding plate mold are attached to the tip of the nozzle. By the extruder, by rotating the screw in the extrusion cylinder, the hydraulic inorganic material is extruded from the die in a compressed state by a method of continuously producing a plate of hydraulic inorganic material having a constant width and thickness. It was

However, in the molding method using such an extrusion molding machine, it is very difficult to stabilize the work because the molded body is deformed due to subtle changes in the pressure inside the extruder, the extrusion speed, the viscosity of the hydraulic inorganic material, etc. And productivity was poor.

Furthermore, it is necessary to add a plasticizer such as methyl cellulose in order to improve the fluidity of the hydraulic inorganic material in the extruder and smooth the extrusion, but this plasticizer is very expensive and causes a cost increase. It was. further,
Since this plasticizer is weak against heat, there is a problem that the performance as a plasticizer is lost due to the temperature rise of the inorganic material accompanied by the pressure rise in the extruder.Therefore, it is possible to set the pressure to a certain value or more. However, there is a problem in that it is impossible to increase the extrusion speed by increasing the pressure to improve the productivity, but it is impossible to increase the extrusion speed beyond a certain speed.

[Means for solving problems]

In view of such a current situation, the present invention has completed the present invention as a result of repeated research to solve the problems of the method for producing an inorganic plate by the extrusion molding method.

That is, according to the present invention, a cylinder and a tip of the cylinder are provided with nozzles having the same cylinder cross-sectional area and opening area and widened in the width direction, and the nozzle is pushed out to the lower surface of the green sheet of the hydraulic inorganic material to be extruded. As the mat conveyor goes to the downstream side in order to contact the green sheet surface on the upper surface and to regulate the thickness of the green sheet, a plurality of presses are gradually placed at positions where the distance between the mat conveyor and the mat conveyor is gradually narrowed. The inorganic plate extruding device is characterized in that a roll is provided and a reverse roll is provided at the downstream end of the press roll.

 This will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of an extrusion apparatus of the present invention. The hydraulic inorganic material 4 is gradually extruded while being kneaded by the rotation of the screw 2 in the cylinder 1, and is extruded at the nozzle 3 portion while being regulated in the thickness direction. Nozzle 3
As shown in FIG. 3, by gradually narrowing in the thickness direction and widening in the width direction, the cross-sectional area in the cylinder 1 and the opening area of the nozzle 3 become the same. In addition, the cross-sectional change from the cylinder 1 to the nozzle 3 is as shown in FIGS.
It is desirable to change gradually. Therefore, the hydraulic inorganic material 4 extruded by the rotation of the screw 2 is sent out from the nozzle with almost no pressure as compared with the case where the shape is regulated and extruded by a conventional die.

At the opening of the nozzle 3, a mat conveyor 5 is provided on the lower surface of the hydraulic inorganic material 4, and a press roll 6 is provided on the upper surface.
Mat conveyor 5 so that a, 6b and 6c contact each other
It is provided at a position where the distance between and is gradually narrowed. These mat conveyor 5 and press rolls 6a, 6b, 6c
Rotates in the forward direction of the hydraulic inorganic material. Hydraulic inorganic material is sent between these,
It is gradually regulated in the thickness direction and at the same time spreads in the width direction. The changes in thickness and width are shown in Figure 2a.
The number of press rolls is increased or decreased depending on the size of the molded body to be obtained. When the number of press rolls is increased, one that rotates in the opposite direction may be provided therein.

The reverse roll 7 is arranged on the downstream side of the press roll and rotates in the direction opposite to the traveling direction of the hydraulic inorganic material. By this reverse roll 7, the surface of the hydraulic inorganic material is made smooth, and the raised parts, the depression due to defoaming, etc. are repaired, and a molded plate of the hydraulic inorganic material having a certain thickness can be obtained.

If necessary, a known doctor blade can be attached to these press rolls and reverse rolls in order to remove inorganic materials adhering to the rolls during rotation.

In addition, if the regulation in the thickness direction by the press roll is increased,
The spread in the width direction becomes large. Therefore, if necessary, attach a cutter in the width direction downstream of the press roll 6c in the figure,
The width can be constant. At this time, the cut ears can be returned to the extruder and used again as a raw material.

Further, in the extruder of the present invention, a roll for feeding the kneaded product of the hydraulic inorganic material may be provided inside the nozzle, and in addition to the extrusion by the screw, the extruder may be positively fed.

The green board of the hydraulic inorganic material is cut into an appropriate length by a cutting machine such as a water jet cutter by the inorganic board extruding device of the present invention, and then subjected to surface irregularity processing and embossing pattern by a molding dehydration press or the like, and then a conventional method. An inorganic plate can be obtained by curing according to.

〔The invention's effect〕

In the extrusion apparatus of the present invention, in the extrusion apparatus, since the kneaded product of the hydraulic inorganic material is delivered without applying pressure, it is not necessary to add the plasticizer used in the conventional extrusion method, and the cost of raw materials can be reduced. Can be achieved. Further, by adjusting the number of press rolls and the distance between the press rolls and the mat conveyor, it is possible to easily obtain a molded plate having a target thickness, and it is also easy to increase the feeding speed in the extruder. It is an excellent device because it can be manufactured and the productivity can be improved.

[Brief description of drawings]

 FIG. 1 is a cross-sectional view of the device of the present invention, and FIGS. 1a to 1d are cross-sectional changes of the tip of the cylinder. FIG. 2: Plan view of the device of the present invention, FIG. 2a: Deformation state of the inorganic material. Fig. 3: Illustration of change in shape of cylinder and nozzle, 1: Cylinder, 2: Screw, 3: Nozzle, 4: Kneaded material, 5: Mat conveyor, 6a, 6b, 6c: Press roll, 7: Reverse roll .

Claims (1)

(57) [Claims] 1. A green sheet of a hydraulic inorganic material extruded to the nozzle 3 portion, in which a nozzle having a cross-sectional area of the cylinder 1 and an opening area equal to each other is provided on the cylinder 1 and the tip of the cylinder 1, and the nozzle is extruded to the nozzle 3. The pull-out mat conveyor 5 is placed on the lower surface so as to contact the green sheet surface on the upper surface, and in order to regulate the thickness of the green sheet, the plurality of mats are gradually arranged at a position where the distance from the mat conveyor is gradually narrowed toward the downstream side. A press roll is provided, and a reverse roll 7 is provided at an end portion on the downstream side of the press roll.