JP2006189373A - Temperature-measuring technique during vulcanization of rubber product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a temperature measuring technique during vulcanizing of rubber products, capable of improving productivity by shortening the outage time of a vulcanizer, while reducing the cost. <P>SOLUTION: This is the technique measuring temperature during vulcanizing of a rubber product 10 by using a temperature sensor 1 for measuring temperature of rubber product 10 during vulcanization and a measuring equipment 2 for storing the temperature data measured with the temperature sensor 1. After the measuring equipment 2 is held in a heat- and pressure- resistance container 3 and the heat- and pressure-resistance container 3 is embedded within the rubber product 10, the temperature sensor 1 is set at the temperature measuring position of the rubber product 10 to initiate to vulcanize. After vulcanization, the heat- and pressure-resistance container 3 is brought out from the vulcanized rubber product and then the measuring equipment 2 is also brought out from the heat- and pressure-resistance container 3, to obtain the temperature data from the measuring equipment 2 that is measured during vulcanization with the temperature sensor 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a temperature measurement method during vulcanization of a rubber product that measures the temperature during vulcanization of a rubber product such as a pneumatic tire.

  Examples of rubber products include pneumatic tires. When setting the vulcanization conditions for this pneumatic tire, or as part of a test to change various vulcanization conditions, the temperature distribution of each part of the tire is measured to examine the thermal history of each part of the tire during vulcanization. It has been broken. At that time, a dedicated thermocouple is embedded inside the unvulcanized tire, while the thermocouple is connected to a measuring instrument outside the vulcanizer so that temperature data measured during vulcanization can be collected by the thermocouple. Yes.

  However, in a tire vulcanizer using a sectional mold, it is difficult to take out the thermocouple from the mold outside the vulcanizer due to its structure, and a hole for extracting a thermocouple is usually formed in the lower mold. Alternatively, this can be achieved by using a lower mold dedicated to temperature measurement with a thermocouple lead-out part.

  However, in the former, it is necessary to perform a hole processing on a lower mold used for normal vulcanization, and after examining the thermal history, to return the hole to its original state. In addition, there is a connection work to connect a thermocouple placed in the mold and a measuring instrument installed outside the vulcanizer, and it is necessary to stop the vulcanizer for a long time due to these work, so productivity Adversely affect.

  On the other hand, the latter requires the production of a lower mold dedicated to temperature measurement, resulting in increased costs, and the vulcanizer for exchanging the lower mold and connecting the thermocouple to the measuring instrument. Since the stop time becomes longer, the productivity is adversely affected as described above.

Conventionally, as a technique described in known literature, it has been proposed to attach a temperature sensor to a mold in order to measure the temperature of a tire during vulcanization (see, for example, Patent Document 1). However, the mounting of the temperature sensor is complicated and expensive, and there is a drawback that the number of mounting is limited.
JP-A-5-162137

  An object of the present invention is to provide a temperature measurement method during vulcanization of a rubber product that can reduce the cost and shorten the stop time of the vulcanizer to improve the productivity.

  The present invention that achieves the above object uses a temperature sensor that measures the temperature of a rubber product during vulcanization and a measuring instrument that is connected to the temperature sensor and stores temperature data measured by the temperature sensor. A method for measuring a temperature during sulfurization, wherein the measuring instrument is housed in a heat-resistant pressure-resistant container, the heat-resistant pressure-resistant container containing the measuring instrument is embedded in a rubber product, and the temperature sensor is used to measure the temperature of the rubber product. Vulcanized after set in position, and after vulcanization, the heat and pressure resistant container was taken out from the vulcanized rubber product, the measuring instrument in the heat and pressure resistant container was taken out, and measured from the measuring instrument during vulcanization with a temperature sensor It is characterized by obtaining temperature data.

  According to the present invention described above, a measuring instrument for storing temperature data is housed in a heat and pressure resistant container, and it is embedded in a rubber product. There is no need to make a special mold. As a result, the cost can be reduced and the vulcanizer stop time can be shortened, so that the utilization rate of the vulcanizer can be increased and the productivity can be improved.

  Also, there is no work to replace the mold or connection between the thermocouple placed in the mold and the measuring instrument installed outside the vulcanizer, so rubber products that are sequentially vulcanized by the vulcanizer (during continuous vulcanization) Temperature data of rubber products) can be measured with high accuracy.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 shows a main part of a temperature measuring method during vulcanization of a rubber product according to the present invention. FIG. 2 shows an example of a heat and pressure resistant container used in the temperature measuring method during vulcanization of a rubber product according to the present invention. As an example, a pneumatic tire (unvulcanized tire), 1 is a thermocouple (temperature sensor) that measures the temperature of a rubber product during vulcanization, and 2 is a measuring instrument (data that stores temperature data measured by the thermocouple) (Logger) 3 is a heat-resistant pressure-resistant container which accommodates the measuring instrument 2.

  The heat and pressure resistant container 3 is made of stainless steel and includes a container body 3A and a lid 3B. The lid 3B is hermetically attached to the container main body 3A by fixing means (not shown).

  As shown in FIG. 3, the bottom wall 3A1 and the side wall 3A2 of the container body 3A and the lid 3B have a double wall structure, and are formed between the inner wall portion a and the outer wall portion b. The space c between the heavy walls is evacuated to exhibit a high heat insulating effect.

  For example, when the rubber product is a pneumatic tire, the heat-resistant pressure-resistant container 3 can withstand use under conditions of a temperature of 170 ° C. and a pressure of 2.45 MPa, and an internal temperature is 70 ° C. or less (ensures the operation of the measuring instrument). It is preferable to have a structure capable of exhibiting a heat insulating effect that is maintained.

  3 A of container main bodies have the connection hole 4 for connecting the thermocouple 1 and the measuring device 2 to one side wall 3A2, and the sealing member 5 shown in FIG. This prevents the heat from entering the container. The seal member 5 has a cylindrical body 5a, and a threaded portion 5b for screwing into the connection hole 4 is provided at the tip of the body 5a. The thermocouple 1 is inserted into the inner cavity portion 5c of the cylindrical body 5a, and an insulator 5d and a seal body 5e are disposed, and the inner cavity portion 5c is sealed by the seal body 5e. The thermocouple 1 is detachably connected to the measuring instrument 2 accommodated in the container body 3A.

  Hereinafter, the temperature measuring method during rubber product vulcanization according to the present invention will be described with reference to FIG. In FIG. 1, 11 is a tread portion, 12 is a sidewall portion, 13 is a bead portion, 14 is a carcass layer, 15 is a belt layer, and 16 is a bead core.

  First, the measuring instrument 2 is arranged in the container main body 3 </ b> A, and the connection side of the plurality of thermocouples 1 extending into the container is connected to the measuring instrument 2 through the seal member 5 attached to the connection hole 4. Next, the lid 3 </ b> B is attached, and the measuring instrument 2 is accommodated in the heat and pressure resistant container 3.

  The bead portion 13 of the unvulcanized tire 10 is partially cut out, and the heat-resistant and pressure-resistant container 3 that houses the measuring instrument 2 is embedded. Next, the side temperature contact 1x of each thermocouple 1 is set at a desired temperature measurement position of the unvulcanized tire 10 (state shown in FIG. 1). After setting, the unvulcanized tire 10 is placed in a mold of a vulcanizer and vulcanized in the same manner as a normal tire. During vulcanization, temperature data measured by the thermocouple 1 is stored in the sequential measuring instrument 2.

  After completion of vulcanization, the vulcanized tire is taken out from the mold of the vulcanizer, and the heat and pressure resistant container 3 is taken out from the buried bead portion 13. The heat-resistant pressure-resistant container 3 is opened, the measuring instrument 2 in the container is taken out, and temperature data measured during vulcanization by each thermocouple 1 is obtained from the taking-out measuring instrument 2.

  As described above, in the present invention, the measuring instrument 2 for storing temperature data is accommodated in the heat-resistant pressure-resistant container 3 and is embedded in the unvulcanized tire 10, so that a hole for extracting a thermocouple is formed in the mold. There is no need for a mold for temperature measurement. Therefore, it is possible to reduce the cost, shorten the vulcanizer stop time, increase the utilization rate of the vulcanizer, and improve the productivity.

  In addition, there is no work to replace the mold or to connect a thermocouple placed in the mold to a measuring instrument installed outside the vulcanizer, so the temperature data of the data collection tire can be accurately obtained during continuous vulcanization. It is also possible to measure.

  In addition, since it is not necessary to pull out the thermocouple 1 to the outside of the vulcanizer, the thermocouple 1 can be shortened to reduce the cost of the thermocouple 1, and the disconnection during the thermocouple 1 connection work can be reduced. Generation can be reduced and measurement work efficiency can be increased.

  In the present invention, a thermocouple can be preferably used as a device for measuring the temperature of a rubber product during vulcanization, but any temperature sensor can be used as long as the temperature of the rubber product during vulcanization can be measured. Also good.

  The measuring instrument 2 may be configured to start operation by a switch, or may operate by detecting a predetermined temperature change. The measuring instrument 2 is preferably configured to be able to store both the temperature data and the time when it was measured.

  The present invention can be preferably used for examining the thermal history of each part of the tire during vulcanization, particularly when setting the vulcanization conditions for a pneumatic tire or as part of a test for changing various vulcanization conditions, The present invention is not limited to pneumatic tires, and any tire can be suitably used as long as the thermal history of rubber products during vulcanization is examined.

It is sectional explanatory drawing which shows the principal part of the temperature measuring method during the rubber product vulcanization | cure of this invention. It is an expansion perspective view which shows an example of a heat-resistant pressure-resistant container. It is a partial expanded sectional view of the heat-resistant pressure-resistant container of FIG. It is a partially notched cross-sectional perspective view which shows an example of a sealing member.

Explanation of symbols

1 Thermocouple (temperature sensor)
2 Measuring instrument 3 Heat and pressure resistant container 4 Connection hole 5 Sealing member 10 Pneumatic tire (rubber product)
c Space

Claims (5)

Using a temperature sensor that measures the temperature of a rubber product during vulcanization and a measuring instrument that is connected to the temperature sensor and stores temperature data measured by the temperature sensor, the temperature during rubber product vulcanization is measured. There,
The measuring instrument is housed in a heat-resistant pressure-resistant container, the heat-resistant pressure-resistant container containing the measuring instrument is embedded in a rubber product, and the temperature sensor is set at the temperature measurement position of the rubber product, followed by vulcanization. Take out the heat and pressure resistant container from the vulcanized rubber product, take out the measuring instrument in the heat and pressure resistant container, and obtain temperature data measured during vulcanization from the measuring instrument by the temperature sensor Method.   The temperature measurement method during vulcanization of a rubber product according to claim 1, wherein the heat and pressure resistant container has a double wall structure, and the space between the double walls is a vacuum.   The temperature measuring method during rubber product vulcanization according to claim 2, wherein the heat and pressure resistant container is made of stainless steel.   The temperature measurement during rubber product vulcanization according to claim 1, wherein the heat and pressure resistant container has a connection hole for connecting a temperature sensor and a measuring instrument, and the connection hole is sealed with a seal member. Method. The temperature measurement method during vulcanization of a rubber product according to claim 1, 2, 3, or 4, wherein the rubber product is a pneumatic tire.

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