JPH09187858A - Extruding method for band-like rubber material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce the out of the standard of the band-like rubber material extruded from an extruder at the time of starting the extrusion by corresponding the set value of the weight per unit length of the extruded material to the sectional area of the regression line obtained in response to the extruded rubber material for forming the band-like rubber material. SOLUTION: The regression line indicating the relation of the weight per unit length to the sectional area of a band-like material W from the data in a period is obtained by the calculation by the arithmetic unit of a central processing unit 11. The weight per unit length of the material W at the time of starting the extrusion of an extruder 1 is set from the line. Thus, even if the rubber physical properties are increased due to the atmospheric temperature change in each season or at every year, it can be extruded corresponding thereto, and hence the occurrence of the bank-like rubber material W out of the standard is largely reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a belt-shaped rubber which is capable of significantly reducing nonstandard specifications when an belt-shaped rubber material made of unvulcanized rubber such as a tread material used for a pneumatic tire is extruded by an extruder. It relates to a method of extruding a material.

[0002]

2. Description of the Related Art For example, a tread material or the like (belt-shaped rubber material), which is a tire constituent material before vulcanization, is continuously extruded in a belt-like shape from an extruder for each predetermined extruded rubber material for each rack in accordance with the extrusion size. After that, it is sequentially cut into a predetermined length. The cut strip rubber material is
The weight of each piece is measured by the sorting and weighing device, and it is checked whether or not the weight is in conformity with the standard. Those out of specification are returned to the extruder and used again as defective products.

By the way, conventionally, in order to obtain a band-shaped rubber material cut according to the standard, a continuous measuring device for measuring the weight per unit length of the band-shaped rubber material is arranged immediately after extrusion, and the unit length measured here is measured. By cutting the weight per unit by controlling the extrusion speed of the extruder and the conveying speed of the drawer conveyor so that the set value corresponds to the target value (standard value) in the sorting and weighing device, cutting within the standard is performed. I am trying to obtain a band-shaped rubber material.

However, there are various causes such as defective shapes, defective lengths, defective markings, etc., which are caused by the non-standard at the start of extrusion. Regardless of the season, the band-shaped rubber material preset depending on the type of rubber and the extrusion size is used. Since the extrusion speed of the extruder and the conveying speed of the drawing conveyor are controlled so that the weight per unit length is adjusted, the physical properties of rubber may vary greatly depending on the season and yearly temperature changes. One of them was measured, and the results were fed back, and when the extrusion conditions were changed to appropriate ones, a large amount of nonstandard specifications (approximately 50% of the total nonstandard specifications) occurred, greatly hindering productivity improvement. Was becoming.

[0005]

DISCLOSURE OF THE INVENTION The object of the present invention is to extrude a strip-shaped rubber material from an extruder in response to a change in rubber physical properties due to seasonal or yearly temperature changes, so that strip-shaped strips at the start of extrusion can be obtained. An object of the present invention is to provide a method for extruding a band-shaped rubber material, which can greatly reduce the out-of-specification of the rubber material and greatly improve the productivity.

[0006]

According to the present invention to achieve the above object, a strip-shaped rubber material made of a predetermined extruded rubber material is continuously extruded from a rack by an extruder through a die,
In the method for extruding the strip-shaped rubber material, which is configured to convey the strip-shaped rubber material through a pulling conveyor, a cross-sectional area of the strip-shaped rubber material obtained for each of the same extruded rubber materials within a predetermined period up to the present time and From the data of the weight per unit length, a regression line showing the relationship of the weight per unit length to the cross-sectional area of the strip-shaped rubber material is obtained according to the extruded rubber material, and the extruded rubber contained in the extruded rubber material. When a belt-shaped rubber material having a specified cross-sectional area that is a material and an extrusion size is newly extruded, the set value of the weight per unit length of the extruded belt-shaped rubber material is set to the extruded rubber constituting the belt-shaped rubber material. It is characterized in that it corresponds to the cross-sectional area of the regression line obtained depending on the material. In this way, a regression line is obtained from the weight per unit length of the strip-shaped rubber material obtained for each of the same extruded rubber materials and the cross-sectional area data in advance within the predetermined period up to now, and the corresponding unit length By extruding at the start of extrusion so that the weight is equal to the weight per unit, even if the rubber physical properties differ due to seasonal or yearly temperature changes, it is possible to extrude the band-shaped rubber material using the data within the corresponding period. Even if an out-of-specification band-shaped rubber material is generated at the start of extrusion, the amount thereof can be greatly reduced and the productivity can be improved.

Further, even for a band-shaped rubber material which is extruded for the first time, the set weight value per unit length can be obtained from the regression line, so that it is possible to reduce the out-of-specification at the start of extrusion. Therefore, the productivity can be further improved.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The configuration of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a schematic explanatory view showing an example of an apparatus for carrying out the method for extruding a strip-shaped rubber material of the present invention, in which 1 is a strip-shaped rubber in which a kneaded unvulcanized extruded rubber material is continuous through a die. An extruder for extruding a material W, 2 is a pull-out conveyor for taking out the strip-shaped rubber material W extruded from the extruder 1, 3 is a continuous measuring device for measuring the weight of the conveyed strip-shaped rubber material W per unit length, 4 -8 is a conveyor for conveying the extruded strip-shaped rubber material W to a cutting point, 9 is a cutting conveyor for cutting the strip-shaped rubber material W to a predetermined length, and 10 is a cut strip-shaped rubber material W '. A sorting and weighing device for individually measuring the weight, and 11 is a central processing unit.

A pull-out conveyor 2 is connected to the push-out side of the extruder 1, a continuous meter 3 is connected to the carry-out side of the pull-out conveyor 2, and conveyor groups 4 to 8 are connected to the carry-out side of the continuous meter 3. A cutting conveyor 9 is provided via the cutting conveyor 9, and a sorting and weighing device 10 is provided on the unloading side of the cutting conveyor 9. Each of the devices 1 to 10 is connected to the central processing unit 11 and automatically controlled.

The belt-shaped rubber material W made of a predetermined extruded rubber material is continuously extruded by the extruder 1 through a die for each rack, and the belt-shaped rubber material W is drawn out by the pulling conveyor 2.
After passing through the continuous measuring device 3 via the conveyor and further conveyed onto the cutting conveyor 9 through the conveyor groups 4 to 8, the cutter 9a cuts the cut rubber material W '. It is sequentially measured by the instrument 10. If something out of the standard occurs, correct the set value of the weight per unit length of the strip-shaped rubber material W so that it falls within the standard,
The corresponding correction signal is fed back via the central processing unit 11 and output to the extruder 1 and the drawing conveyor 2.

In the storage device provided in the central processing unit 11, a cross-sectional area showing the extruded size of the strip-shaped rubber material W obtained when extruding for a certain period up to the present time and a unit length corresponding to the cross-sectional area are shown. A large number of data (including different kinds of extruded rubber materials) indicating weight per unit weight and date are stored, and when the extruded rubber material and the extruded size are designated, the arithmetic unit of the central processing unit 11 , All the data of the weight per unit length of the same extruded rubber material and its extruded size within a predetermined period that can cope with the season and the temperature change up to the present time are called, and as shown in FIG. A regression line f showing the relationship between the size and the weight per unit length is calculated.

According to the present invention, the extruded rubber material and the extruded size accumulated in the storage device of the central processing unit 11 are determined, and when the designated band-shaped rubber material is newly extruded, the central processing unit 11 firstly stores the extruded rubber material and the extruded rubber material. Enter extrusion data. In the arithmetic unit of the central processing unit 11, the weight of the strip-shaped rubber material W for the same extruded rubber material per unit length and the data of its cross-sectional area are all retrieved from the storage unit. After selecting only those within a predetermined period that can cope with the temperature change and the temperature change, a regression line f showing the relationship between the cross-sectional area of the belt-shaped rubber material W and the weight per unit length is calculated from the data within those periods. To be

Next, the weight per unit length of the strip-shaped rubber material corresponding to the specified extrusion size is obtained from the regression line f, and the extrusion speed of the extruder 1 and the pull-out conveyor 2 are determined according to the obtained set values. Central processing unit 1
The extrusion is started under the control of the No. 1 control unit. Even when different kinds of extruded rubber materials are designated, the regression line and its set value for each extruded rubber material are obtained in the same manner as above.

The extruded strip-shaped rubber material W is taken up by the pull-out conveyor 2, and then is continuously counted by the continuous metering device 3 and is sequentially cut on the cutting conveyor 9 through the conveyor groups 4 to 8 and cut. The weight of each of the strip-shaped rubber materials W ′ thus prepared is measured by the sorting and weighing device 10. The data of the weight is sent to the central processing unit 11, and it is determined whether or not it is within the standard, and when it is determined that it is out of the standard, the weight per unit length of the belt-shaped rubber material W is set so as to be within the standard. The set value of the weight is corrected, and a signal corresponding to the corrected value is output to the extruder 1 and the drawing conveyor 2, and the extrusion speed of the extruder 1 and the conveying speed of the drawing conveyor 2 are adjusted.

Since the weight per unit length of the strip-shaped rubber material W at the start of extrusion is set from the regression line obtained by using only the data within the predetermined period up to the present, the season, Even if the physical properties of rubber vary greatly due to yearly temperature changes, it can be extruded correspondingly, so the occurrence of out-of-specification band-shaped rubber materials is significantly less than in the past. When it is determined that the cut strip-shaped rubber material W'is within the standard, data indicating the cross-sectional area of the strip-shaped rubber material W at that time, the corresponding weight per unit length, and the date is stored in the central processing unit 11. Stored in the storage device,
It is used when obtaining a regression line as data within a newly obtained period, instead of data after a predetermined period has elapsed.

As described above, according to the present invention, the regression line is obtained from the data of the weight per unit length of the strip-shaped rubber material W obtained for each of the same extruded rubber materials in advance within a predetermined period up to the present time and the data of its cross-sectional area. Even if the rubber physical properties vary greatly depending on the seasonal or yearly temperature change, the data corresponding to f should be used by finding f and extruding it at the start of extrusion so that it becomes the corresponding weight setting value per unit length. Since the band-shaped rubber material W is extruded in this manner, even if a non-standard band-shaped rubber material is generated at the start of extrusion, the amount of the band-shaped rubber material is greatly reduced, and the productivity can be significantly improved.

Further, even if the extrusion size is manufactured for the first time, the weight set value per unit length can be obtained from the regression line f, so that the number of out-of-specifications at the start of extrusion can be reduced, It is possible to further improve productivity. About 2 months can be seen as the above-mentioned predetermined period, and using the data after this period,
It is not preferable because it contains data in which the physical properties of rubber have changed significantly. In the present invention, instead of using the period as described above, the temperature data and rubber physical properties (for example, viscosity modulus) at each time are also stored in the central processing unit 11.
It is also possible to store the data in the storage device and to retrieve the regression line f by calling the data group of the weight per unit length and its cross-sectional area from the temperature data and the rubber physical properties.

In the above embodiment, the extruder 1 is used to change the weight of the extruded strip-shaped rubber material W per unit length.
Although the extrusion speed and the conveyance speed of the drawing conveyor 2 are both controlled, the weight per unit length can be changed by controlling at least one speed. Further, in the present invention, the cross-sectional area of the extruded strip-shaped rubber material W is used as one of the data stored in the storage device of the central processing unit 11, but instead, the opening area of the die may be used. Good.

The present invention can be preferably used, for example, for extruding a tread material or the like made of unvulcanized rubber which is a tire constituent material, but is not limited thereto, and a rubber material is continuously extruded in a belt shape. If there is any, it can be suitably used.

[0020]

As described above, according to the present invention, from the data of the cross-sectional area and the weight per unit length of the strip-shaped rubber material obtained for each of the same extruded rubber materials within a predetermined period up to the present time, A regression line showing the relationship of the weight per unit length to the cross-sectional area of the strip-shaped rubber material is obtained according to the extruded rubber material, and the extruded rubber material included in the extruded rubber material and the cross-sectional area that is the extrusion size are specified. When a new strip-shaped rubber material is newly extruded, the set value of the weight per unit length of the extruded strip-shaped rubber material is set to the regression line obtained according to the extruded rubber material constituting the strip-shaped rubber material. Since it corresponds to the cross-sectional area, even if the rubber physical properties change due to seasonal or yearly temperature changes, the out-of-specification of the strip-shaped rubber material extruded from the extruder at the start of extrusion is greatly reduced, increasing productivity. It is possible to above.

[Brief description of the drawings]

FIG. 1 is a schematic explanatory view showing an example of an apparatus for carrying out an extrusion method for a belt-shaped rubber material according to the present invention.

FIG. 2 is a graph showing an example of a regression line.

[Explanation of symbols]

1 Extruder 2 Drawer Conveyor 3 Continuous Meter 9 Conveyor for Cutting 10 Sorting Meter 11 Central Processing Unit W Belt-shaped Rubber Material f Regression Line

Claims (3)

[Claims] 1. Extrusion of a belt-shaped rubber material, wherein a belt-shaped rubber material made of a predetermined extruded rubber material is continuously extruded by a extruder for each rack through a die, and the belt-shaped rubber material is conveyed through a drawing conveyor. In the method, from the data of the cross-sectional area and the weight per unit length of the strip-shaped rubber material obtained in advance for each of the same extruded rubber material within a predetermined period up to the present time, the strip-shaped rubber material is determined according to the extruded rubber material. When a regression line showing the relation of the weight per unit length to the cross-sectional area of is extruded rubber material extruded rubber material and the strip-shaped rubber material having a specified cross-sectional area which is the extrusion size is newly extruded In addition, the set value of the weight per unit length of the extruded band-shaped rubber material corresponds to the cross-sectional area of the regression line obtained according to the extruded rubber material forming the band-shaped rubber material. Extrusion process of the belt-like rubber material so as to. 2. The method for extruding a band-shaped rubber material according to claim 1, wherein a die opening area is used instead of the cross-sectional area. 3. The extrusion of a band-shaped rubber material according to claim 1, wherein the regression line is obtained by using data obtained within a newly obtained period in place of the data obtained after a predetermined period has passed out of the data. Method.