KR900001485B1 - Vulcanizing an elastomer - Google Patents

Abstract

A method of vulcanizing an eleastomer in a vulcamizing chamber using a mixt. of a low thermal capacity gas and a high thermal capacity thermal fluid, is composed of a) introducing the low thermal capacity gas (G) and the high thermal capacity thermal gluid (S) into a mixer (4), b) vulcanizing the elastomer using the mixt. that has been fed into the vulcanizing chamber from the start of the vulcanizing process, and c) measuring the actual temp. and the pressure in the vulcanizing chamber or in the mixer all the time during the process of vulcanization and controlling the supply.

Description

Vulcanization Method of Elastomer Articles

1 is an explanatory diagram showing an embodiment of the vulcanization method of the present invention.

2 is a longitudinal sectional view of the mixer ejector.

3 is an explanatory diagram showing another embodiment of the method of the present invention.

* Explanation of symbols for main parts of the drawings

A: tire G: low heat capacity gas

E: exhaust gas S: steam

4: Mixer 5: Pressure Sensor

6: temperature sensor

The present invention relates to a method for vulcanizing an elastomeric article, and in detail, a method for vulcanizing an elastomeric article installed in a vulcanization chamber using a mixed fluid of a low heat capacity gas and a high heat capacity heat fluid.

Various methods have been adopted as a vulcanization method for an elastomeric article. In particular, in Japanese Patent Laid-Open No. 5164579, a so-called gas vulcanization method has been proposed.

The present invention provides a process for curing a elastomeric article by supplying a relatively low pressure, high heat capacity heat fluid such as steam to the vulcanizable elastomeric article installed in the vulcanization chamber. And a subsequent step of introducing a gas having a lower heat capacity than the thermal fluid in the second step to complete the vulcanization of the article.

However, this method has a problem that there is a limitation in controlling the pressure and temperature of the relatively low pressure high heat capacity heat fluid supplied in the first step to cure the elastomeric article, so that it cannot be sufficiently satisfactory curing.

That is, since a saturated vapor is generally used as a fluid having a high heat capacity, since the saturated vapor has a proportional relationship between temperature and pressure, in the conventional method described above, when (1) the temperature is appropriate, The pressure is so low that the air contained between the mold and the vulcanized article cannot be discharged satisfactorily, resulting in processing damage (beanes) on the surface of the vulcanized article or poor adhesion on the body. This was easy to occur. (2) When the pressure is appropriate, the temperature becomes too high and the vulcanized article is in a state of being excessively vulcanized, which has disadvantages such as deterioration of the rubber and deterioration of the cord.

The present invention has been made in order to solve the above-mentioned drawbacks in conventional gas vulcanization, and a high heat capacity thermofluid such as steam and a low heat capacity gas is mixed in advance outside the vulcanization chamber, By supplying the mixed fluid adjusted as the pressure into the vulcanization chamber in which the Alastoma article is installed, the vulcanization chamber is free from damage to the processing surface and a suitable vulcanization is completed at a stable price.

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

1 is an explanatory view showing an embodiment of the vulcanizing method of the present invention, and a vulcanizing chamber using a tire A as an example of the vulcanizable elastomeric article of the vulcanizing method and also having a bladder in the same drawing. That is, the state which the vulcanization of the tire A loaded in the metal mold advanced considerably is shown.

2 is a longitudinal sectional view of an ejector that is a mixer.

3 is an explanatory diagram showing another embodiment of the method of the present invention.

In FIG. 1, (1) is a bladder (a state in which the outer periphery surface is expanded by fluid supply), (2) the upper mold (3) is a lower mold.

The tire A is interposed between the bladder 1 and the molds 2 and 3.

Numeral 4 denotes a mixer, in which steam S and gas G are fed into the mixer 4, and the mixed fluid is supplied to the bladder 1 in the vulcanization chamber.

Reference numeral 5 denotes a pressure sensor, 6 denotes a temperature sensor, and 7 denotes a controller in which a microcomputer is installed.

(8) are check valves, V ₁ , V ₂ and V ₃ are self-regulating valves attached to the pipelines of steam (S), gas (G) and exhaust (E), respectively.

In the controller 7, the pressure is always sensed as the pressure sensor 5 in the mixed fluid supply path supplied from the mixer to the vulcanization chamber and the temperature as the temperature sensor 6 in the discharge path of the exhaust gas E. and, and a controller (7), the pressure on the ₄₅ required in response to it, so we pre-charged to the appropriate conditions of pressure and temperature to avoid vulcanization of the vulcanized articles

The method of the present invention will be described in more detail, for example, when a tire of size 1000-20 is used as a vulcanized article. Vulcanization conditions in the tire vulcanizer of 1000-20 size is 140-200 ℃ temperature, the pressure is in the range of 15-30kg / Cm ^2, for example as 170 ℃ place in advance charged to the controller 7, the condition of 28kg / Cm ² First, the raw tire is loaded into the mold, the automatic regulating valves V ₁ and V ₂ are opened, and V ₃ is closed to supply the steam S and the gas G to the mixer 4.

Then, the mixed fluid mixed in the mixer is supplied into the mold. This starts the airflow. During the heating process by the mixed fluid, the pressure and temperature of the mixed fluid are always in-put to the controller and automatically change to V ₁ , V ₂ depending on the conditions of 170 ℃ -28kg / Cm ² given to the former. It is to control the opening degree of steam and gas automatic control valve.

For example, in the case where the pressure and temperature of the mixed fluid are excessively insufficient, when the temperature is insufficient to the reference position, V ₁ , V ₂ and V ₃ are opened, and the pressure is too high than the reference position, and the temperature is the reference position. If all the lack of open and V _3, first a mixed fluid exhaust _{31 2}

When only the pressure is lower than the reference position, V ₁ and V ₃ are closed and V ₂ can be opened to supply a large amount of gas to the mixer. In addition, in this invention, the mixer 4 which uses a mixture of steam and gas is not specifically limited. For example, as shown in FIG. 2, gas (G) is introduced into (11), and the vapor pressure (S) from the inlet (12) is sucked in by the gas pressure, mixed with the gas flow, and mixed fluid ( ≪>) may be used as an ejector having a structure that ejects from the discharge port 13.

3 shows the case of using a non-ejector mixer.

In this way, the vulcanization (heating process) of the tire is completed by supplying the mixed fluid having the above conditions for 40-50 minutes. The same applies to vulcanization without intervening bladder.

After completion of the heating process, open the V ₃ (V _{5 in Figure} 3) automatic control valve to the exhaust port, close the V ₁ and V ₃ steam and gas control valves and exhaust the mixed fluid to complete the heating process. do.

After the heating step, the entire vulcanization step is completed via a conventionally known step such as a cooling water step. The elastomeric articles employing the vulcanization method of the present invention include fenders, sleeves, hoses, and the like, in addition to the tires of the examples.

As described above, in the vulcanization method of the present invention, a mixed fluid of vapor and gas is prepared in advance by a mixer outside the vulcanization chamber and supplied into the vulcanization chamber to vulcanize the vulcanized article and

It also has the effect of preventing unnecessary consumption of energy because it adjusts the amount of heat as necessary according to the continuous setting conditions.

Claims (6)

A method for vulcanizing an elastomeric article, wherein the elastomeric article installed in the vulcanization chamber is vulcanized by supplying a mixed fluid of a gas having a low heat capacity and a thermal fluid having a high heat capacity that is steam. 2. The vulcanization method of an elastomeric article according to claim 1, wherein the high heat capacity heat fluid, which is a low heat capacity gas and steam, is a mixed fluid in a mixer in advance. 2. The mixing fluid of claim 1 wherein the mixed fluid is temperature and pressure input to the controller 7 by signals from the temperature sensor 6 and the pressure sensor 5 installed in or outside the mixer 4. Vulcanization method of the elastomeric article characterized in that it is adjusted to. A mixing vessel arranged outside the vulcanization chamber and mixing a high heat capacity heat fluid, which is steam connected to the vulcanization chamber, and a low heat capacity gas, to obtain a mixed fluid as a vulcanization heat medium, and installed inside or outside the mixing container. And the pressure sensor and the temperature sensor 6 for detecting the pressure and temperature of the mixed fluid and outputting signals, respectively, and receiving the signals from the pressure sensor 5 and the temperature sensor 6. It consists of a controller (7) installed inside a microcomputer that maintains a constant level of temperature and pressure, and a vulcanization chamber for vulcanizing the elastomeric article using a mixed gas having the above controlled temperature and pressure. Vulcanizing apparatus for an elastomeric article. 5. The vulcanizing apparatus of an elastomeric article according to claim 4, wherein the mixing vessel is made of an ejector type. 5. The vulcanizing apparatus of an elastomeric article according to claim 4, wherein the mixing container is made of a non-ejector type.

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