JP2015217568A - Manufacturing apparatus of unvulcanized rubber sheet and manufacturing method of the unvulcanized rubber sheet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing apparatus an unvulcanized rubber sheet and a manufacturing method of the unvulcanized rubber sheet capable of improving quality of the unvulcanized rubber sheet and reducing variations in the quality in manufacturing the unvulcanized rubber sheet by sheeting unvulcanized rubber using a calender roll.SOLUTION: A manufacturing apparatus of an unvulcanized rubber sheet is equipped with: a feed roll for warming kneaded unvulcanized rubber; a feed conveyor for conveying the warmed unvulcanized rubber from the feed roll to a calender roll; the calender roll for forming a bank by the conveyed unvulcanized rubber and then for sheeting the unvulcanized rubber; a heater arranged in the middle of the conveyor to heat the unvulcanized rubber conveyed on the feed conveyor; and a thermometer for measuring the temperature of the bank. In a manufacturing method of the unvulcanized rubber sheet, output power of the heater is controlled according to the measured temperature of the bank to adjust heating of the unvulcanized rubber conveyed on the feed conveyor.

Description

  The present invention relates to an unvulcanized rubber sheet manufacturing apparatus and a manufacturing method for manufacturing an unvulcanized rubber sheet by sheeting unvulcanized rubber using a calender roll.

  In the tire manufacturing process, conventionally, kneaded unvulcanized rubber is supplied to a feed roll and heated, and then sheeted to a predetermined thickness and width using a calendar roll.

  Specifically, the unvulcanized rubber supplied from the feed roll to the calendar roll via the feed conveyor forms a bank on the calendar roll, and then the unvulcanized rubber having a predetermined thickness (sheet gauge) by the calendar roll. Sheeted on the sheet. At this time, since the bank condition greatly affects the quality of the sheeted unvulcanized rubber sheet, such as the thickness, shape, surface condition, etc., controlling the bank condition on the calender roll can control the unvulcanized rubber sheet. This is one of the points of quality control in manufacturing.

  As a method of controlling the state of the bank on the calendar roll, it has been proposed to improve the quality of the unvulcanized rubber sheet and reduce the quality variation by controlling the amount of the formed bank to be constant. (For example, Patent Document 1 and Patent Document 2).

JP-A-6-170875 Japanese Patent Laid-Open No. 7-137061

  However, the effect of the control of the bank amount as described above is still not sufficient, and further improvement is required.

  In particular, even if uncured rubber with the same physical properties is seated while controlling the amount of bank under the same equipment conditions, if the outside air temperature during production changes, the unvulcanized rubber conveyed on the feed conveyor Under the influence, the processability of the unvulcanized rubber in the calendar roll changes, and it is difficult to sufficiently improve the quality of the unvulcanized rubber sheet and reduce the variation in quality.

  Therefore, the present invention aims to improve the quality of unvulcanized rubber sheets and reduce the variation in quality when manufacturing unvulcanized rubber sheets by sheeting unvulcanized rubber using a calender roll. An object of the present invention is to provide an apparatus and a method for producing an unvulcanized rubber sheet that can be used.

  As a result of intensive studies to solve the above problems, the present inventor has found that the above problems can be solved by the invention described below, and has completed the present invention.

The invention described in claim 1
A feed roll that heats the kneaded unvulcanized rubber, a feed conveyor that transports the heated unvulcanized rubber from the feed roll to the calendar roll, and a bank formed by the transported unvulcanized rubber. An unvulcanized rubber sheet manufacturing apparatus comprising a calender roll for sheeting the unvulcanized rubber after forming
A heater that is disposed in the middle of the feed conveyor and that heats the unvulcanized rubber conveyed on the feed conveyor;
An apparatus for producing an unvulcanized rubber sheet, comprising a thermometer for measuring the temperature of the bank.

The invention described in claim 2
The apparatus for producing an unvulcanized rubber sheet according to claim 1, wherein the thermometer is a non-contact thermometer.

The invention according to claim 3
The unvulcanized rubber sheet according to claim 1 or 2, further comprising a control unit that automatically controls the output of the heater based on the temperature of the bank measured by the thermometer. Device.

The invention according to claim 4
An unvulcanized rubber sheet production method for producing an unvulcanized rubber sheet using the unvulcanized rubber sheet production apparatus according to any one of claims 1 to 3,
Measure the temperature of the bank with the thermometer,
The heating of the unvulcanized rubber is adjusted by controlling the output of a heater for heating the unvulcanized rubber conveyed on the feed conveyor based on the measured temperature of the bank. This is a method for producing a vulcanized rubber sheet.

The invention described in claim 5
5. The method for producing an unvulcanized rubber sheet according to claim 4, wherein the output of the heater is automatically controlled based on the temperature of the bank.

The invention described in claim 6
If the measured bank temperature is lower than a preset temperature, increase the heater output,
If the measured bank temperature is higher than a preset temperature, lower the heater output,
6. The apparatus for producing an unvulcanized rubber sheet according to claim 4, wherein the heating of the unvulcanized rubber is adjusted.

The invention described in claim 7
The method for producing an unvulcanized rubber sheet according to any one of claims 4 to 6, wherein the output of the heater is controlled so that the temperature of the bank becomes 70 to 100 ° C. .

The invention according to claim 8 provides:
The method for producing an unvulcanized rubber sheet according to any one of claims 4 to 7, wherein an unvulcanized rubber sheet having a sheet gauge of 0.2 to 3.0 mm is produced.

  According to the present invention, when producing an unvulcanized rubber sheet by sheeting the unvulcanized rubber using a calender roll, the quality of the unvulcanized rubber sheet is improved and the variation in quality is reduced as compared with the prior art. It is possible to provide an unvulcanized rubber sheet production apparatus and production method that can be used.

It is a perspective view which shows typically the structure of the manufacturing apparatus of the unvulcanized rubber sheet which concerns on one embodiment of this invention.

  Hereinafter, the present invention will be described with reference to the drawings based on embodiments.

  FIG. 1 is a perspective view schematically showing a configuration of an apparatus for producing an unvulcanized rubber sheet according to the present embodiment. In FIG. 1, 11a and 11b are a set of feed rolls, 12a and 12b are a set of calender rolls, and 13 is a feed conveyor, which are the same as those of a conventional unvulcanized rubber sheet manufacturing apparatus.

  And the manufacturing process of an unvulcanized rubber sheet is also basically the same as the conventional one. That is, the kneaded unvulcanized rubber G is first heated by passing through the gap between the feed rolls 11a and 11b set to a predetermined temperature, and is usually heated to 60 to 90 ° C.

  Next, the heated unvulcanized rubber G is cut to a predetermined width by the cutter 16, and conveyed from the feed rolls 11a and 11b to the calendar rolls 12a and 12b by the feed conveyor 13, and the calendar roll 12a, 12b is supplied.

  Next, the supplied unvulcanized rubber G is further heated by the calender rolls 12a and 12b set to a predetermined temperature, and a bank B having a temperature of 70 to 100 ° C. is formed on the calender rolls 12a and 12b. . Then, the unvulcanized rubber G sheeted to a predetermined thickness by passing through the gap between the calendar rolls 12 a and 12 b from the bank B is cut out to a predetermined width using the cutter 17. Thereby, the unvulcanized rubber sheet S having a predetermined thickness and width is manufactured.

  However, in the unvulcanized rubber sheet manufacturing apparatus according to the present embodiment, unlike the conventional unvulcanized rubber sheet manufacturing apparatus, the unvulcanized rubber G conveyed on the feed conveyor 13 is further heated. And a thermometer 15 for measuring the temperature T of the bank B is provided.

  In the present embodiment, control means (not shown) for automatically controlling the output of the heater 14 based on the measured temperature T of the bank B is provided. Thereby, when the measured temperature T of the bank B changes, the heating of the unvulcanized rubber can be adjusted by controlling the output of the heater 14 online in real time in response to the change. Thus, an unvulcanized rubber sheet S can be manufactured.

  Specifically, when the temperature T of the bank B is lower than a predetermined temperature, specifically, a temperature selected and set within a range of 70 to 100 ° C., the output of the heater 14 is increased and the feed conveyor 13 is increased. The unvulcanized rubber G conveyed above is sufficiently heated to increase the temperature T of the bank B formed on the calendar rolls 12a and 12b until the temperature T reaches a predetermined temperature.

  On the other hand, when the temperature T of the bank B is higher than the predetermined temperature, the output of the heater 14 is lowered to suppress the heating to the unvulcanized rubber G conveyed on the feed conveyor 13, and the calendar rolls 12a, 12b The temperature T of the bank B formed above is suppressed so as not to exceed a predetermined temperature.

  As described above, according to the present embodiment, the temperature T of the bank B can always be maintained in the vicinity of the set constant temperature. Even in the winter when the vulcanized rubber G is easily cooled, the processability of the unvulcanized rubber G in the calendar roll does not deteriorate. As a result, it is possible to sufficiently reduce the occurrence of defects such as perforations in the unvulcanized rubber sheet S, rough surface conditions, and unevenness of the sheet gauge due to a decrease in processability of the unvulcanized rubber G. The unvulcanized rubber sheet S can be stably produced.

  On the other hand, since it is also suppressed that the unvulcanized rubber G is heated to an unnecessarily high temperature, it is possible to sufficiently suppress the occurrence of burn-in defects in the unvulcanized rubber sheet S. Unvulcanized rubber sheet S can be manufactured stably.

  Further, when the processability of the unvulcanized rubber G is lowered, conventionally, in order to appropriately ensure the quality of the unvulcanized rubber sheet S, the interval between the calendar rolls 12a and 12b is adjusted, Although the temperature of 12b was adjusted, among these, adjustment of the space | interval of the calender rolls 12a and 12b was very difficult, and there were many parts which depended on an operator's intuition and experience. When the sheet gauge is as thin as 0.2 to 3.0 mm, it is particularly difficult to adjust the roll interval, and it is difficult to provide an unvulcanized rubber sheet having a stable quality.

  However, in the present embodiment, the temperature T of the bank B can always be maintained in the vicinity of a constant set temperature, so that stable processability of the unvulcanized rubber G can be ensured. Even a thin sheet gauge unvulcanized rubber sheet can be easily manufactured with stable quality without depending on the intuition and experience of the operator.

  The thermometer 15 is preferably a non-contact type thermometer. By simply placing the non-contact type thermometer facing the bank B away from the calendar rolls 12a and 12b by a simple method, the bank temperature T can be continuously and quickly secured without affecting the bank B. Can be measured.

  Instead of the automatic control described above, the operator may measure the temperature T of the bank B, and the operator may manually control the output of the heater 14 based on the temperature T.

  In addition, the technique described in the present embodiment may be combined with a conventional technique that controls the amount of banks to be constant. In this case, the effects of both techniques are demonstrated synergistically, and further the quality is improved. Thus, it is possible to stably provide an unvulcanized rubber sheet with little variation.

  Hereinafter, the present invention will be described more specifically with reference to examples.

1. 1. Production of unvulcanized rubber sheet Using the unvulcanized rubber sheet production apparatus shown in FIG. 1, sheeting of unvulcanized rubber with a predetermined composition is performed, with an aim width of 500 mm and an aim gauge of 0.5 mm (comparison) Two types of unvulcanized rubber sheets of Example 1, Example 1, Example 2) and 3.0 mm (Comparative Example 2, Example 3, Example 4) were produced.

  At this time, in Examples 1 to 4, the heater output was appropriately controlled around 50%, so that the preset bank temperature of 80 ° C. was maintained. Further, in Examples 2 and 4, the control for keeping the amount of banks constant was also performed. On the other hand, in Comparative Examples 1 and 2, neither bank temperature adjustment nor bank amount control was performed.

2. Evaluation (1) Variation in Bank Temperature During the sheeting operation in each example and comparative example, the bank temperature is measured 10 times at a predetermined time interval (N = 10), and the MAX value and the MIN value are extracted from the result. At the same time, the difference (MAX−MIN) between the MAX value and the MIN value was determined.

(2) Variation of sheet gauge Similarly, during the sheeting operation in each example and comparative example, the sheet gauge of the unvulcanized rubber sheet that was seated was measured 10 times at predetermined time intervals (N = 10), The MAX value and the MIN value were extracted from the result, and the difference (MAX−MIN) between the MAX value and the MIN value was obtained.

(3) Quality variation In each of the examples and comparative examples, it was visually confirmed whether uncured rubber sheets were not defective or burned.

(4) Evaluation results Table 1 shows the evaluation results in the examples and comparative examples together with the manufacturing conditions described above.

  According to Table 1, in Examples 1 to 4 in which the bank temperature was adjusted compared to Comparative Examples 1 and 2 in which the bank temperature was not adjusted, the MAX value of the bank temperature was lower while the MIN value was It can be seen that the bank temperature can be maintained near the set temperature with small variations.

  Compared with Comparative Examples 1 and 2, in Examples 1 to 4, the MAX value of the sheet gauge is decreased, while the MIN value is increased, and the sheet gauge can be maintained in the vicinity of the target gauge with a small variation. I understand. In addition, it can be seen that the occurrence of burns and holes is prevented. From this result, it was confirmed that the product quality of the unvulcanized rubber sheet can be improved by controlling the temperature of the bank.

  Further, even in the case where the bank temperature is controlled in the same manner, in the second and fourth embodiments in which the control for maintaining the amount of the bank is kept constant, the sheets are compared with the first and third embodiments. It was confirmed that the product quality of the unvulcanized rubber sheet could be further improved by further reducing the gauge variation and combining the control of the bank amount.

  While the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments. Various modifications can be made to the above-described embodiment within the same and equivalent scope as the present invention.

11a, 11b Feed roll 12a, 12b Calendar roll 13 Feed conveyor 14 Heater 15 Thermometer 16, 17 Cutter T Bank temperature G Unvulcanized rubber S Unvulcanized rubber sheet B Bank

Claims (8)

A feed roll that heats the kneaded unvulcanized rubber, a feed conveyor that transports the heated unvulcanized rubber from the feed roll to the calendar roll, and a bank formed by the transported unvulcanized rubber. An unvulcanized rubber sheet manufacturing apparatus comprising a calender roll for sheeting the unvulcanized rubber after forming
A heater that is disposed in the middle of the feed conveyor and that heats the unvulcanized rubber conveyed on the feed conveyor;
An apparatus for producing an unvulcanized rubber sheet, comprising: a thermometer for measuring the temperature of the bank.   2. The apparatus for producing an unvulcanized rubber sheet according to claim 1, wherein the thermometer is a non-contact thermometer.   The unvulcanized rubber sheet according to claim 1 or 2, further comprising a control unit that automatically controls the output of the heater based on the temperature of the bank measured by the thermometer. apparatus. An unvulcanized rubber sheet production method for producing an unvulcanized rubber sheet using the unvulcanized rubber sheet production apparatus according to any one of claims 1 to 3,
Measure the temperature of the bank with the thermometer,
The heating of the unvulcanized rubber is adjusted by controlling the output of a heater for heating the unvulcanized rubber conveyed on the feed conveyor based on the measured temperature of the bank. A method for producing a vulcanized rubber sheet.   5. The method for producing an unvulcanized rubber sheet according to claim 4, wherein the output of the heater is automatically controlled based on the temperature of the bank. If the measured bank temperature is lower than a preset temperature, increase the heater output,
If the measured bank temperature is higher than a preset temperature, lower the heater output,
6. The apparatus for producing an unvulcanized rubber sheet according to claim 4, wherein heating of the unvulcanized rubber is adjusted.   The method for producing an unvulcanized rubber sheet according to any one of claims 4 to 6, wherein the output of the heater is controlled so that the temperature of the bank becomes 70 to 100 ° C.   The method for producing an unvulcanized rubber sheet according to any one of claims 4 to 7, wherein an unvulcanized rubber sheet having a sheet gauge of 0.2 to 3.0 mm is produced.

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