JPH07156122A - Apparatus for producing extrusion molded sheet - Google Patents

Abstract

PURPOSE:To provide an apparatus which can produce an extrusion molded sheet having an objective thickness by controlling efficiently the thickness of the sheet. CONSTITUTION:A noncontact type thickness measuring means 4 is placed close to the discharge opening 2 of an extruder 1, and the thickness of an extrusion molded sheet 3 immediately after being extruded from the opening 2 is measured with the measuring means 4. The results of the measurement is fed back to an element part of the extruder 1 concerning the thickness of the sheet 3 to control the thickness of the sheet 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing extruded sheets such as ceramic green sheets.

[0002]

2. Description of the Related Art When manufacturing an extrusion molded sheet such as a ceramic green sheet, usually, a ceramic raw material kneaded with water or the like is molded into a sheet by an extruder and dried in a drying oven. Manufacturing.

FIG. 6 is a diagram showing an example of a conventional method for manufacturing an extruded sheet. In this conventional manufacturing method, the undried extrusion-molded sheet extruded from the discharge port 52 of the extruder 51 (hereinafter, also simply referred to as “sheet”)
54 is, for example, of a drying oven 53 in which a belt conveyor mechanism of a plurality of stages using a belt 60 made of a plain weave cloth is arranged,
First and second conveyors (upper conveyor) 55a, 5
5b is placed and conveyed, and by the heaters 56a and 56b,
After drying the surface (upper surface) of the sheet 54,
When the sheet 54 is transferred onto the conveyor 55c, the sheet 54 is turned over.
The surface of the non-dried side (the lower surface before being inverted) is dried by the heater 56c, and when the sheet is transferred to the fourth conveyor 55d in the lower stage, the sheet 54 is inverted again and dried by the heater 56d, After drying both sides of the sheet 54, the sheet thickness is measured using a thickness measuring device 57 such as an air type thickness measuring device, and the sheet thickness of the extrusion molding machine 51 is manually related based on the measurement result. The sheet thickness is adjusted by feeding back the element portion (for example, the position control means of the resistance plate (not shown) disposed in the mouthpiece portion of the ejection port 52) to be controlled.

[0004]

However, the above-mentioned conventional method for producing an extruded sheet has the following problems.

Immediately after being extruded from the extruder, the undried sheet has a soft sheet and a viscous surface, so that the sheet thickness cannot be measured by a contact measuring method, and the sheet cannot be measured after drying. Since the quality of the sheet thickness cannot be determined until the sheet thickness is measured, the adjustment time becomes long until a sheet having the target sheet thickness can be obtained, resulting in poor production efficiency. In the thickness measurement after drying, when it is found that a sheet having the target sheet thickness is not obtained, a considerable amount of a defective thickness sheet is already formed between the discharge port and the thickness measurement position. Since it has been set, many sheets are wasted. It is necessary to adjust the sheet thickness not only from the traveling direction of the sheet but also from the width direction of the sheet, and since there is similar shrinkage (about 10%) due to drying, these can be efficiently fed back to each part of the extruder. Therefore, it is difficult to adjust the sheet thickness, and skill is required for the adjustment work.

The present invention solves the above-mentioned problems, and the extrusion of a sheet having a target sheet thickness by rapidly adjusting the thickness of an extruded sheet without causing a large number of sheets having defective thickness. It is an object of the present invention to provide an extruded sheet manufacturing apparatus capable of efficiently manufacturing a molded sheet and having an easy adjustment work.

[0007]

In order to achieve the above-mentioned object, an apparatus for producing an extrusion-molded sheet according to the present invention is an extrusion-molding machine for extruding a sheet material from a discharge port to form a sheet, and the extrusion-molding machine. Of the extruded sheet immediately after being extruded from the ejection port, the thickness of the extruded sheet being measured without contacting the extruded sheet; And a control means for feeding back the thickness measurement result by the thickness measurement means to the element portion of the extrusion molding machine related to the thickness of the extrusion molded sheet.

Further, the non-contact type thickness measuring means is a laser thickness measuring machine.

Further, the element portion of the extrusion molding machine relating to the thickness of the extrusion molding sheet is divided into a plurality of (a) parallel to the extrusion direction of the sheet, which is disposed at the mouthpiece portion of the discharge port of the extrusion molding machine. The position control means of the resistance plate that changes the thickness of the corresponding portion of the extruded sheet by contacting the extruded sheet and giving a predetermined resistance, and (b) the elements related to the pushing force of the sheet extruding means. It is characterized by being at least one of the push output control means for controlling.

[0010]

[Operation] By using the non-contact type thickness measuring means,
Since it becomes possible to measure the thickness of the extruded sheet immediately after being extruded from the discharge port of the extruder, by feeding back the measurement result to the element part of the extruder related to the thickness of the extruded sheet. Therefore, it becomes possible to adjust the sheet thickness quickly and accurately by eliminating the time lag.

Further, since the distance from the discharge port of the extrusion molding machine to the sheet thickness measurement position becomes small, it is possible to greatly reduce the amount of sheets with defective thickness.

Furthermore, since the sheet thickness is measured immediately after being extruded from the extruder, rather than measuring the sheet thickness after the similar shrinkage caused by drying, it is easy to determine the correction amount by feedback. No need for skill to adjust the thickness.

By using a laser thickness measuring machine as the non-contact type thickness measuring means, the thickness of the extruded sheet immediately after being extruded from the discharge port of the extrusion molding machine can be accurately measured.

Further, the measurement result of the sheet thickness is divided into a plurality of pieces arranged in the mouth portion of the discharge port of the extrusion molding machine in parallel to the sheet extruding direction, and abutted on the extruded sheet to give a predetermined resistance. At least the position control means of the resistance plate that changes the thickness of the corresponding portion of the extruded sheet by giving it, and the pushing force control means that controls the elements related to the pushing force of the sheet pushing means (for example, the rotation speed of the screw). By feeding back to one, it becomes possible to efficiently control the thickness of the sheet in the traveling direction and the width direction, and it becomes possible to reliably manufacture an extrusion-molded sheet having a target sheet thickness.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a schematic configuration of an extrusion molded sheet manufacturing apparatus of the present invention.

As shown in FIG. 1, in the vicinity of the discharge port 2 of the screw type extrusion molding machine 1, the thickness of the extrusion molded sheet 3 immediately after being extruded from the discharge port 2 is the same as the extrusion molded sheet 3.
A non-contact type thickness measuring means (laser thickness measuring machine in this embodiment) 4 for measuring without touching the substrate is provided.

The laser thickness measuring device 4 includes an upper laser sensor 6 arranged so as to sandwich a sheet 3 conveyed horizontally on an air floating plate 5 provided with a slit 5a for passing a laser beam. It is configured to include a lower laser sensor 7 and a laser thickness measuring machine controller 8, and the upper and lower laser sensors 6 and 7 are
It is fixed to the sensor fixing frame 9. The sensor fixing frame 9 to which the upper and lower laser sensors 6 and 7 are fixed is the sensor fixing frame 9 in the width direction of the seat 3 (and the laser sensors 6 and 7 fixed thereto).
Is held by a uniaxial type positioning unit 10 capable of traversing.

In the extrusion-molded sheet manufacturing apparatus according to this embodiment, necessary information is set to the thickness of the extrusion-molded sheet 3 of the extrusion-molding machine 1 based on the data measured by the laser thickness measuring machine 4. A control (calculation) means 11 is provided for feeding back to each related element part.

As shown in FIGS. 2 and 3, the extrusion molding machine 1 has a screw (sheet extrusion means) for applying a propulsive force to the sheet raw material in a supply passage 18 for supplying the sheet raw material to the discharge port 2. ) 12 and the discharge port 2
As shown in FIGS. 2, 3 and 4, the base portion 13 of the sheet is divided into a plurality of pieces in parallel with the extruding direction of the sheet 3 and abuts the extruded sheet 3 to give a predetermined resistance,
The resistance plate 14 has a structure in which the thickness of the corresponding portion of the sheet 3 is changed (that is, the sheet thickness in the width direction is adjusted), and each resistance plate 14 has a structure as shown in FIG. The position control means 17 including the motor 15 and the speed reducer 16 is configured to be able to actuate with high accuracy.

Although not shown in FIG. 1, the sheet 3 whose thickness has been measured by the laser thickness measuring machine 4 is sent to a drying oven equipped with a sheet conveying conveyor to be dried,
After drying, the thickness is measured by a thickness measuring means such as an air micro.

Next, the operation of adjusting the thickness of the extruded sheet using the above system will be described. First, when the extrusion-molded sheet 3 is extruded from the discharge port 2 of the extrusion-molding machine 1, the sheet thickness is immediately measured by the laser thickness measuring machine 4 arranged near the discharge port 2. Since the laser thickness measuring machine 4 is a non-contact type thickness measuring means, an accurate measurement result can be obtained even when the sheet thickness is measured immediately after being extruded, and the soft sheet 3 immediately after molding is damaged. There is nothing to do.

Then, the measurement data of the sheet thickness obtained here is sent to the control (calculation) means 11, and the necessary data for adjusting the sheet thickness based on the value is sent from the control (calculation) means 11. Base part 1 of discharge port 2 of extrusion molding machine 1
3 for controlling the position of the resistance plate 14 disposed on the No. 3 (FIG. 3)
And the thickness of the sheet 3 is adjusted.

Further, the measurement data of the sheet thickness is also sent to a conveyor of a drying furnace (not shown), and the speed of the conveyor is adjusted based on the data to adjust the thickness of the sheet 3 in the traveling direction. Is configured to be able to.

Further, by feeding back the measurement result of the sheet thickness after drying (thickness measurement value by means of thickness measuring means such as air micro) to the element parts of the extruder 1, the thickness shrinkage due to drying can be corrected. Is also possible.

FIG. 5 shows a flow chart of the thickness adjusting step in the case of manufacturing an extrusion-molded sheet using the extrusion-molded sheet manufacturing apparatus of the above embodiment.

As described above, the thickness of the sheet 3 can be measured immediately after being extruded from the extrusion molding machine 1 by using the laser thickness measuring machine 4 as the non-contact type thickness measuring means. By feeding back to the element portion related to the thickness of the sheet 3 of the extruder 1, the sheet thickness can be accurately adjusted.

Further, since the distance from the discharge port 2 to the thickness measuring position (that is, the laser thickness measuring machine 4) is small, it is possible to reliably prevent a large number of sheets with defective thickness from occurring.

Further, since the sheet thickness is measured immediately after being extruded from the extrusion molding machine 1 rather than being measured through the similar shrinkage due to drying, the sheet thickness is measured by feedback without requiring special skill. The correction amount can be easily determined.

In the above embodiment, the case where the thickness measurement result by the non-contact type thickness measuring means is fed back to the position control means 17 of the resistance plate 14 of the extrusion molding machine 1 has been described. It may be configured such that it is fed back to the push output control means (not shown) that controls the rotation speed of 12 or it is fed back to both the position control means 17 and the push output control means.

The element parts of the extrusion molding machine relating to the thickness of the extruded sheet to which the thickness measurement result by the non-contact type thickness measurement means is fed back are the position control means of the resistance plate and the rotation speed of the screw. The present invention is not limited to the control means (push force control means), and it is possible to feed back to the control means for controlling the amount of water added to the kneaded clay and the degree of kneading in the previous step and other element parts. .

Further, in the above embodiment, the case where the laser thickness measuring machine is used as the non-contact type thickness measuring means has been described, but the non-contact type thickness measuring means is not limited to this, and other optical means. It is possible to use various non-contact type thickness measuring means such as a typical thickness measuring means.

The present invention is not limited to the above embodiment in other respects, and relates to the shape and structure of the resistance plate, the specific configuration of the resistance plate position control means and the push output control means, and the like. Various applications and modifications can be made within the scope of the invention.

[0033]

As described above, the apparatus for producing an extruded sheet according to the present invention uses the non-contact type thickness measuring means to measure the thickness of the extruded sheet immediately after being extruded from the discharge port of the extruder. Immediately after being extruded from the discharge port of the extrusion molding machine, the measurement result is fed back to the element part of the extrusion molding machine related to the thickness of the extrusion molding sheet to adjust the thickness of the extrusion molding sheet. The thickness measurement result of the extruded sheet can be fed back to the element portion of the extrusion molding machine related to the thickness of the extruded sheet to adjust the sheet thickness quickly and accurately.

Further, since the distance from the discharge port of the extrusion molding machine to the sheet thickness measurement position becomes small, it is possible to significantly reduce the amount of sheets with defective thickness.

Furthermore, since the sheet thickness is measured immediately after being extruded from the extruder, rather than measuring the sheet thickness after the similar shrinkage due to drying occurs, it becomes easy to determine the correction amount by feedback, The sheet thickness can be accurately adjusted without requiring skill.

By using a laser thickness measuring machine as the non-contact type thickness measuring means, the thickness of the extruded sheet immediately after being extruded from the discharge port of the extrusion molding machine can be accurately measured.

Further, the measurement result of the sheet thickness is divided into a plurality of parts arranged in the mouthpiece part of the discharge port of the extrusion molding machine in parallel with the extruding direction of the sheet and abutted on the extruded sheet to give a predetermined resistance. By providing, by feeding back to at least one of the resistance plate position control means for changing the thickness of the corresponding portion of the extruded sheet, and the pushing force control means for controlling the elements related to the pushing force of the sheet pushing means, It is possible to efficiently control the thickness of the sheet in the advancing direction and the width direction, and it is possible to reliably manufacture an extrusion-molded sheet having a target sheet thickness.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of an extrusion-molded sheet manufacturing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan sectional view showing a structure in the vicinity of a discharge port of an extrusion molding machine which constitutes an extrusion molded sheet manufacturing apparatus according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2, showing a structure in the vicinity of a discharge port of an extrusion molding machine that constitutes an extrusion molded sheet manufacturing apparatus according to an embodiment of the present invention.

FIG. 4 is a side view showing a structure in the vicinity of a discharge port of an extrusion molding machine which constitutes an extrusion molded sheet manufacturing apparatus according to an embodiment of the present invention.

FIG. 5 is a diagram showing a flowchart of a thickness adjusting step when an extrusion-molded sheet is manufactured using the extrusion-molded sheet manufacturing apparatus according to the embodiment of the present invention.

FIG. 6 is a diagram showing a conventional method for producing an extruded sheet.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Extrusion molding machine 2 Discharge port 3 Extrusion molding sheet 4 Non-contact type thickness measuring means (laser thickness measuring machine) 5 Air floating plate 6, 7 Laser sensor 8 Laser thickness measuring machine controller 9 Sensor fixing frame 10 Positioning unit 11 Control ( Computation means 12 Screw 13 Base part 14 Resistance plate 15 Motor 16 Reducer 17 Position control means 18 Supply path

Claims (3)

[Claims] 1. An extrusion molding machine that extrudes a sheet material from a discharge port to form a sheet, and a thickness of an extrusion molded sheet that is disposed in the vicinity of the discharge port of the extrusion molding machine and immediately after being extruded from the discharge port. A non-contact type thickness measuring means for measuring without touching the extruded sheet, and a thickness measurement result by the non-contact type thickness measuring means, which is an element part of the extruder related to the thickness of the extruded sheet. An apparatus for producing an extruded sheet, comprising: 2. The extruded sheet manufacturing apparatus according to claim 1, wherein the non-contact type thickness measuring means is a laser thickness measuring machine. 3. The element portion of the extrusion molding machine, which is related to the thickness of the extrusion molding sheet, is divided into a plurality of (a) parallel to the extrusion direction of the sheet, which is disposed in the mouthpiece portion of the discharge port of the extrusion molding machine. The resistance plate position control means for changing the thickness of the corresponding portion of the extruded sheet by abutting against the extruded sheet to give a predetermined resistance, and (b) an element related to the pushing force of the sheet extruding means. The extrusion-molded sheet manufacturing apparatus according to claim 1 or 2, wherein the extrusion-molded sheet manufacturing apparatus is at least one of a pushing force control means for controlling.