JP5906065B2 - Extrusion train and extrusion method - Google Patents

Description

  The present invention relates to an extrusion train and an extrusion method used for manufacturing a tire, and particularly to an extrusion train and an extrusion method capable of improving the productivity of an extruded rubber member.

  Generally, a tire manufacturing process includes a process of kneading an unvulcanized rubber material supplied to an extrusion part of an extrusion train and extruding it as a rubber member having a desired cross-sectional shape, and cooling and cutting the extruded rubber member. And a green tire molding process in which both ends are wound around a molding drum to form a cylindrical shape.

  Here, as described in, for example, Patent Documents 1 and 2, the extruding part in the extrusion train kneads the supplied unvulcanized rubber material with a screw provided therein to adjust the temperature of the rubber material. While being raised, the kneaded rubber material is wound by a base disposed at the tip of the extrusion part, for example, on a molding core for producing a raw tire, such as a molding drum, a hard core, or a base tire. Extruded into a ribbon-like rubber member having a cross-sectional shape.

JP 2000-79642 A JP 2009-113202 A

By the way, the temperature of the rubber member extruded from the extruding part depends on the rotational speed of the screw in the extruding part (that is, the extrusion speed), and the temperature of the rubber member increases as the rotational speed increases. Here, even if the rotational speed of the screw is constant, the temperature rising varies depending on the material of the rubber material to be extruded. If the temperature of the extruded rubber material exceeds a temperature upper limit value that satisfies the predetermined quality, the quality of the rubber member and, in turn, the tire manufactured using this rubber member will deteriorate. Therefore, in the prior art, the rotational speed of the screw has been set to a low value with a considerable margin so that the temperature of the obtained rubber member does not exceed the specified temperature upper limit value that satisfies the predetermined quality. . As a result, there is a problem that the productivity of the rubber member is lowered, and there is a demand for a way to increase the productivity of the rubber member.
Therefore, an object of the present invention is to provide a method for producing a rubber member used for tire manufacture with high productivity.

  As a result of intensive investigations on how to solve the above problems, the inventor provided a temperature measurement unit for measuring the surface temperature of the extruded rubber member downstream of the extrusion unit in the extrusion train, and the measured surface temperature of the rubber member Based on the above, it has been found that it is effective to control the extrusion speed of the rubber member by the extrusion section and the conveyance speed of the rubber member obtained by the conveyance section, and the present invention has been completed.

That is, the extrusion train of the present invention is an extrusion train having an extrusion unit that kneads the supplied rubber material and extrudes it as a rubber member having a predetermined cross-sectional shape, and a conveyance unit that conveys the extruded rubber member. A control unit for controlling the extrusion speed of the rubber member and the conveyance speed for conveying the extruded rubber member, and a temperature measurement unit for measuring the surface temperature of the extruded rubber member downstream of the extrusion unit. The control unit has a specified temperature upper limit value that guarantees the quality of the rubber member to be produced in a temperature region higher than the process temperature set to guarantee the quality of an arbitrary rubber member, and the specified temperature upper limit value. An allowable temperature upper limit value between the process temperature and an allowable temperature lower limit value lower than the allowable temperature upper limit value are set, and the measured surface temperature of the rubber member is the If it is less than capacity lower limit temperature raises the extrusion rate and the conveying speed, if it exceeds the allowable temperature upper limit lowers the extrusion rate and the transport speed, the measured temperature is, the lower limit temperature or wherein when in upper temperature limit the range, the is characterized in Rukoto extrusion speed and the transport speed changed stepwise.

The rubber member extrusion method of the present invention is an extrusion method in which a supplied rubber material is kneaded and extruded as a rubber member having a predetermined cross-sectional shape, and the extruded rubber member is conveyed. In a temperature range higher than the process temperature set to ensure the above, a specified temperature upper limit value that ensures the quality of the rubber member to be produced, an allowable temperature upper limit value between the specified temperature upper limit value and the process temperature, and An allowable temperature lower limit value lower than the allowable temperature upper limit value is preset, the surface temperature of the extruded rubber member is measured, and the measured surface temperature of the rubber member is the allowable temperature lower limit value. the increasing extrusion speed and the transport speed in the case of less than the when exceeding the allowable temperature upper limit lowers the speed feed rate and transportable out press, the control unit was the measurement Degree is, if the range of less than the allowable lower limit temperature above the allowable temperature upper limit, the is characterized in Rukoto extrusion speed and the transport speed changed stepwise.

  According to the present invention, the temperature of the rubber member extruded by the extrusion unit can be constantly monitored, and the extrusion speed and conveyance speed of the extruded rubber member can be controlled in a speed range higher than the conventional process speed. The productivity of the rubber member can be increased.

It is a figure which shows one Example of the extrusion train by this invention. It is a figure explaining the outline | summary of the control method of the extrusion speed and conveyance speed of a rubber member. It is a figure which shows the extrusion rate at the time of normal production, and the temperature change of a rubber member.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The extrusion train according to the present invention includes an extrusion unit that kneads the supplied rubber material and extrudes it as a rubber member having a predetermined cross-sectional shape, and a conveyance unit that conveys the extruded rubber member. Here, a control unit that controls the extrusion speed of the rubber member and the conveyance speed of conveying the extruded rubber member, and a temperature measurement unit that measures the surface temperature of the extruded rubber member downstream of the extrusion unit, It is important that the control unit controls the extrusion speed and the conveyance speed based on the measured surface temperature of the rubber member.

  As described above, in the conventional extrusion train, the extrusion speed of the rubber member has a considerable margin so that the rubber member extruded by the extrusion unit does not exceed the specified upper temperature limit value that guarantees a predetermined quality. Therefore, it was set at a low level, which led to a decrease in productivity. Therefore, the extrusion train according to the present invention includes a temperature measurement unit downstream of the extrusion unit, constantly measures and monitors the surface temperature of the rubber member extruded by the extrusion unit, and based on the measured surface temperature, By controlling the extrusion speed and the conveying speed of the rubber member by the conveying section, the productivity of the rubber member can be increased.

  As described above, the extrusion train according to the present invention is based on the temperature measurement unit provided downstream of the extrusion unit and the surface temperature of the rubber member measured by the temperature measurement unit. Since it has the characteristic in controlling the conveyance speed of a member, it does not specifically limit about structures other than the above.

  FIG. 1 is a diagram showing an embodiment of an extrusion train according to the present invention. The extrusion train 1 includes an extrusion unit 2 that kneads the supplied rubber material M and extrudes it as a rubber member P having a predetermined cross-sectional shape, a conveyance unit 3 that conveys the extruded rubber member P, and the rubber. A control unit 4 that controls the extrusion speed of the member P and the conveyance speed for conveying the extruded rubber member, and a temperature measurement unit 5 that is provided downstream of the extrusion unit 2 and measures the surface temperature of the extruded rubber member. And a winding unit 6 for winding the conveyed rubber member P. Hereinafter, each structure of the extrusion train 1 will be described.

The extruding unit 2 kneads the supplied unvulcanized rubber material M with a screw (not shown) provided inside and extrudes it as a rubber member P having a predetermined cross-sectional shape. The extrusion speed of the extruded rubber member P is proportional to the rotational speed of the screw. The rotational speed of the screw is controlled by the control unit 4 based on the surface temperature of the rubber member P measured by the temperature measuring unit 5 as will be described later. Is set. The extrusion speed of the rubber member P depends on the size and material of the extrusion member P.
As this extrusion part 2, a single screw extrusion part and a multi-screw extrusion part can be used, for example, and as a multi-screw extrusion screw, especially an extrusion part which has two screws, a biaxial taper screw extrusion part, 2 A single-shaft extrusion part, a feeder / ruder, etc. can be used.

  The conveyance unit 3 conveys the extruded rubber member P to a green tire molding process which is the next process. The conveyance speed of the rubber member P is controlled by the control unit 4 in the same manner as the screw in the extrusion unit 2 as described later. Here, the conveyance speed by the conveyance part 3 is made the same as the extrusion speed of the rubber member P by the extrusion part 2. As this conveyance part 3, a belt conveyor can be used, for example.

  The control unit 4 controls the extrusion speed of the rubber member P by the extrusion unit 2 and the conveyance speed of the rubber member P extruded by the conveyance unit 3. In order to control the extrusion speed and the conveyance speed, first, a prescribed temperature upper limit value that guarantees the quality of the rubber member P to be produced is determined. The quality of the rubber member P in the present invention relates to the width, weight, contour, and length. These qualities depend on the temperature of the rubber member P, and when the temperature exceeds a certain temperature upper limit value, the quality is deteriorated. Therefore, a specified temperature upper limit value is determined such that each of the quality items satisfies a predetermined standard.

  In the actual control of the extrusion speed and the conveyance speed, appropriate allowable temperature upper limit values and allowable temperature lower limit values lower than the specified temperature upper limit values are set in advance according to the material of the rubber material M supplied to the extrusion unit 2. When the surface temperature of the rubber member P measured by the temperature measuring unit 5 is below the allowable lower limit value, the extrusion speed (and conveyance) of the rubber member P is determined. Speed) is increased, and if the upper limit of the allowable temperature is exceeded, the extrusion speed (and transport speed) of the rubber member P is controlled to be reduced.

  Here, the allowable temperature upper limit value and the allowable temperature lower limit value are appropriately set according to the rubber material M to be used.

  The method for controlling the extrusion speed and the conveyance speed of the rubber member P by the controller 4 is not particularly limited, and any method can be used as long as the extrusion speed and the conveyance speed can be controlled with high controllability.

  The temperature measuring unit 5 measures the surface temperature of the rubber member P extruded from the extruding unit 2 and outputs it to the control unit 4. The control unit 4 controls the extrusion speed of the rubber member P by the extrusion unit 2 and the conveyance speed of the rubber member P by the conveyance unit 3 based on the surface temperature of the rubber member P measured by the temperature measurement unit 5, thereby Satisfy quality. The temperature measuring unit 5 is preferably provided in the vicinity of the outlet of the rubber member P downstream of the extruding unit 2 so that the temperature of the rubber member P immediately after being extruded can be measured. As the temperature measuring unit 5, for example, a radioactive thermometer or an infrared camera can be used.

  The winding unit 6 winds the rubber member P that is transported by the transport unit 3 and cut to a predetermined length. The rubber member P taken up by the take-up unit 6 is conveyed to a green tire molding process that is the next process.

  Next, a method for controlling the extrusion speed and the conveyance speed of the rubber member P by the extrusion train 1 of one embodiment according to the present invention will be described. FIG. 2 is a diagram illustrating an outline of control of the extrusion speed of the rubber member P by the extrusion unit 2 and the conveyance speed of the rubber member P by the conveyance unit 3 according to the present invention. The production flow of the rubber member P by the extrusion train 1 is as follows. That is, the rubber material M is supplied to the extruding part 2, the rubber member is kneaded by a screw (not shown) provided inside the extruding part 2, and extruded as a rubber member P having a predetermined cross-sectional structure. Next, the extruded rubber member P is transported by the transport unit 3, cooled, wound by a reel, and transported to a green tire molding process as a next process. For this purpose, first, the rubber member P is pushed out by the extruding unit 2 onto rollers (not shown) provided at various locations downstream of the extruding train 1 (tip guidance). Next, when the extruded rubber member P is passed between rollers provided on the most downstream side of the extrusion train 1, the production of the rubber member P is started, and the rubber member P is removed from the extrusion unit 2 at a set process speed. After being extruded and conveyed and cut to a predetermined size, it is wound up by the winding unit 6 (normal production). Thereafter, when the necessary amount of the rubber member P is produced and switched to another size of the rubber member P, or when the production of the rubber member P is finished, the process speed and the conveyance speed are reduced to reduce the rubber member. Production of P is stopped (size switching).

  The principle of improving the productivity of the rubber member P by the extrusion train 1 according to an embodiment of the present invention will be briefly described. The extrusion speed of the rubber member P by the extrusion unit 2 and the conveyance speed by the conveyance unit 3 are the same as those in the conventional process. The productivity of the rubber member P is increased by controlling the speed range to be larger than the speed.

That is, in the prior art, the process speed is always kept constant during normal production, and the temperature of the rubber member P corresponds to the standard temperature upper limit value that ensures the quality of the rubber member P as described above. It was set to a low value with a considerable margin so as not to exceed the upper temperature limit.
On the other hand, in the extrusion train 1 of one embodiment according to the present invention, first, after the temperature of the rubber member P is raised to the conventional process temperature, an appropriate value lower than the predetermined temperature upper limit set in advance is set. Control is performed between the speed ranges of the extrusion speed (and conveyance speed) of the rubber member P respectively corresponding to the allowable upper limit value and the allowable lower limit value. Since this speed range is larger than the process speed of the prior art, the productivity of the rubber member P can be improved.

  With reference to FIG. 3, the control of the extrusion speed during normal production will be described more specifically. In the present invention, a temperature range not lower than the allowable temperature lower limit value and not higher than the allowable temperature upper limit value is defined as a “dead zone”. Also, the temperature range exceeding the upper limit of the allowable temperature and below the upper limit of the standard temperature is the “deceleration zone”, the temperature range of the temperature lower than the lower limit of the allowable temperature is the “retry zone”, and the temperature range exceeding the upper limit of the standard temperature is the “out zone” Is defined. The guideline for controlling the extrusion speed and the conveyance speed of the rubber member P in the present invention is such that the surface temperature of the rubber member P measured by the temperature measuring unit 5 is maintained in the dead zone so as not to reach the out zone. Is to control.

As an example, the standard upper limit value that guarantees the quality of the rubber member P to be produced is 125 ° C., and the allowable temperature upper limit value and the allowable temperature lower limit value when the rubber member P is produced by the extrusion train 1 are 120 ° C. and 115 ° C., respectively. As previously defined.
At the start of production of the rubber member P, the extrusion speed pushed out by the extruding unit 2 is small, and therefore the surface temperature of the rubber member P is lower than the conventional process temperature. The extrusion speed by 2 and the conveyance speed by the conveyance unit 3 are increased. At this time, in the present invention, these speed increases are performed in a plurality of stages. This is to suppress rubber behavior. Here, the number of stages of speed increase of the extrusion speed and the conveyance speed and the magnitude of the speed increase are not particularly limited, and may be set appropriately.

  When the extrusion speed and the conveyance speed increase by the above-described multiple steps, the surface temperature of the rubber member P becomes equal to or higher than the allowable temperature lower limit value, and when the dead zone is entered, the extrusion speed and the conveyance speed are kept constant without being changed. Thereafter, when the surface temperature of the rubber member P exceeds the upper limit of the allowable temperature and enters the deceleration region, the extrusion speed and the conveyance speed are reduced in a plurality of stages to reduce the surface temperature of the rubber member P. When the surface temperature of the rubber member P enters the dead zone, the extrusion speed and the conveyance speed are kept constant.

  On the other hand, when the surface temperature of the rubber member P falls below the lower limit of the allowable temperature, the surface temperature of the rubber member P is increased by increasing the extrusion speed and the conveyance speed in a plurality of stages to increase the surface temperature of the rubber member P. When the temperature enters the dead zone, the extrusion speed and the conveyance speed are kept constant.

  Thus, by controlling the extrusion speed by the extrusion unit 2 and the conveyance speed by the conveyance unit 3 based on the surface temperature of the rubber member P measured by the temperature measurement unit 5, the temperature of the rubber member P becomes the upper limit of the standard temperature. It can be controlled not to exceed the value.

  When controlling the extrusion speed and the conveyance speed based on the surface temperature of the rubber member P measured as described above, if the surface temperature of the rubber member P is not in the dead zone, the extrusion speed and the conveyance speed are controlled. By not having, the weight fluctuation of the obtained rubber member P can be reduced.

  Thus, with the extrusion train of the present invention, the temperature of the rubber member extruded by the extrusion unit is constantly monitored, and the extrusion speed and conveyance speed of the extruded rubber member are controlled to a higher speed range than the conventional process speed. Therefore, the productivity of the rubber member can be increased.

  According to the present invention, the temperature of the rubber member extruded by the extrusion unit can be constantly monitored, and the extrusion speed and conveyance speed of the extruded rubber member can be controlled within a speed range higher than the conventional process speed. Since the productivity is high, it is useful for mass production of tire rubber members.

DESCRIPTION OF SYMBOLS 1 Extrusion train 2 Extrusion part 3 Conveyance part 4 Control part 5 Temperature measurement part 6 Winding part M Rubber material P Rubber member

Claims (2)

In an extrusion train having an extrusion unit that kneads the supplied rubber material and extrudes it as a rubber member having a predetermined cross-sectional shape, and a conveyance unit that conveys the extruded rubber member,
A controller that controls the extrusion speed of the rubber member and the conveyance speed of conveying the extruded rubber member;
A temperature measuring unit that measures the surface temperature of the extruded rubber member downstream of the extrusion unit;
In the temperature region higher than the process temperature set so as to ensure the quality of an arbitrary rubber member, the control unit includes a specified temperature upper limit value that ensures the quality of the rubber member to be produced, the specified temperature upper limit value, and the Set an allowable temperature upper limit value between the process temperature and an allowable temperature lower limit value lower than the allowable temperature upper limit value,
When the measured surface temperature of the rubber member is less than the allowable temperature lower limit value, the extrusion speed and the conveyance speed are increased, and when the measured surface temperature exceeds the allowable temperature upper limit value, the extrusion speed and the conveyance speed are increased. Lower ,
Wherein the control unit, the measured temperature is, when in the range of the allowable lower limit temperature above the allowable temperature upper limit, and wherein the Rukoto stepwise changing the extrusion rate and the transport speed Extrusion train. In an extrusion method of kneading the supplied rubber material and extruding it as a rubber member having a predetermined cross-sectional shape, and conveying the extruded rubber member,
In a temperature range higher than the process temperature set so as to ensure the quality of an arbitrary rubber member, a specified temperature upper limit value that ensures the quality of the produced rubber member, and between the specified temperature upper limit value and the process temperature And an allowable temperature lower limit value lower than the allowable temperature upper limit value are preset,
Measuring the surface temperature of the extruded rubber member;
The surface temperature of the measured the rubber member, the increased speed transmission rate and transportable out push in the case of less than the allowable lower limit temperature, the extrusion rate and the conveyed if exceeding the allowable temperature upper limit Slow down ,
The measured temperature, wherein when in the temperature lower limit value or greater than the upper temperature limit the range, extrusion method of the rubber member characterized by Rukoto stepwise changing the extrusion rate and the transport speed.

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