JP2003025341A - Steam vulcanization apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a steam vulcanization apparatus capable of dispensing with lapping to simplify a vulcanizing process and capable of shortening a work time. SOLUTION: A steam supply pipe 2 and a compressed air supply pipe 3 are connected to a hermetically closed vulcanizer 1 and spray nozzles 20 are attached in the vulcanizer 1 at the end part of the steam supply pipe 2. A pressure sensor 12 and adjustment valves 7 and 10 are connected through a pressure controller. The valve opening degrees of the adjustment valves 7 and 10 are regulated corresponding to the pressure value detected by the pressure sensor 12. By supplying steam and compressed air into the vulcanizer 1 under predetermined pressure, vulcanization is performed at an arbitrary temperature under arbitrary pressure corresponding to the partial pressures of steam and compressed air.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for directly vulcanizing an unvulcanized product with steam, and more particularly, to controlling the pressure and temperature of the uncured product by a mixed fluid of steam and compressed air. The present invention relates to a steam vulcanizing apparatus capable of vulcanizing by adjusting the temperature. 2. Description of the Related Art As a conventional steam vulcanizing apparatus, for example, an apparatus for vulcanizing a rubber roll is disclosed in Japanese Patent Application Laid-Open No. 50-3483. In this method, a rubber material is rolled into a sheet, laminated around a core material, and the surface thereof is wrapped with a film sheet or a cloth tape and vulcanized by hot steam. [0003] In the above conventional device,
After an operator wraps and vulcanizes a film sheet around a rubber roll and vulcanizes it, the operator must remove the film sheet again, which causes a problem that the operation process becomes complicated and the operation process requires time. [0004] The wrapping of the unvulcanized rubber is to prevent the rubber from expanding during vulcanization and from being deformed by heat. [0005] It is therefore an object of the present invention to provide a steam vulcanizing apparatus that does not require lapping, simplifies the vulcanizing process, and reduces the working time. Means taken to solve the above problem is to arrange an unvulcanized rubber material in a closed container and to supply steam from a steam supply pipe into the container. In the vulcanization by supplying steam and directly contacting the unvulcanized product with steam, a compressed air supply pipe for supplying compressed air at a predetermined pressure into the closed container is connected, and the inside of the closed container is compressed with compressed air. In addition to vulcanization as a mixed state of steam, a spray nozzle is attached to the end of the steam supply pipe on the container side. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The inside of a closed container is mixed with compressed air and steam, and the partial pressure of compressed air and steam is adjusted to vulcanize the container at an arbitrary pressure or temperature. be able to. In the case of steam, strictly speaking, in the case of saturated steam,
The pressure and the temperature are uniquely determined, and the temperature can be set to an arbitrary value by adjusting the pressure. The steam pressure is adjusted to set the steam temperature to a predetermined value suitable for vulcanization, and the sum of the partial pressures of the steam and the compressed air does not cause the rubber during the vulcanization to undergo expansion or deformation due to heat dripping. By setting the pressure to, lapping can be made unnecessary. [0010] By attaching a spray nozzle to the end of the steam supply pipe on the container side, steam is ejected from the spray nozzle into the closed container in a wide-angle conical shape, and steam is supplied to almost the entire inside of the closed container. By making the resulting temperature distribution uniform, temperature unevenness can be prevented and the entire unvulcanized product can be uniformly vulcanized. By disposing the spray nozzles at a plurality of locations in the closed container, for example, at the upper, lower, upper and lower portions, or right and left portions of the container, the supply of steam to the entire container can be made more uniform. can do. FIG. 1 shows a vulcanized can 1 as a closed container.
, A steam supply pipe 2, a compressed air supply pipe 3, and a spray nozzle 20 constitute a steam vulcanizing apparatus. The vulcanizing can 1 has a horizontally long cylindrical shape and a shelf 4 on which a rubber roll (not shown) as an unvulcanized material is mounted. A partially spherical lid 5 is attached to the side of the vulcanizing can 1 so as to be freely opened and closed. At the start of vulcanization, the lid 5 is opened and a rubber roll is placed on the shelf 4. A steam supply pipe 2 and a compressed air supply pipe 3 are connected to the upper part of the vulcanizer 1. The steam supply pipe 2 is connected to a spray nozzle 20 on the upper part of the vulcanizing can 1 via a valve 6, a control valve 7, and a valve 8. The steam supply pipe 2 is branched by a branch pipe 21 and connected to the lower spray nozzle 20 via the valve 11. The compressed air supply pipe 3 is connected to the vulcanization can 1 via a valve 9 and a control valve 10. In this embodiment, the spray nozzle 20
Is shown above and below the vulcanizing can 1 with a total of 5
Depending on the size and shape of the vulcanizing can 1, only one vulcanizing can may be used, and the vulcanizing can 1 can be attached not only to the top and bottom but also to the left and right. A pressure sensor 12 for detecting the internal pressure and a temperature sensor 13 for detecting the temperature are mounted on the upper part of the vulcanizing can 1. The pressure sensor 12 is electrically connected to the control valves 7 and 10 via a pressure controller (not shown). By increasing or decreasing the valve opening of each of the control valves 7 and 10, it is possible to arbitrarily control the respective partial pressures by adjusting the amount of passage of steam or compressed air. The temperature sensor 13 is electrically connected to the control valve 7 via a temperature controller (not shown). Since the pressure and temperature of the saturated steam are uniquely determined, the temperature can be maintained at a predetermined value by controlling the steam pressure to a predetermined value. Therefore, in this embodiment, the temperature sensor 13 is not necessarily required to be used as an auxiliary. An atmosphere communicating pipe 15 is connected to the right side of the vulcanizing can 1 via a valve 14. Further, a condensate rejection pipe 16 for rejecting condensate in which steam is condensed to the outside is connected to a lower portion of the vulcanizing can 1. The condensate drain pipe 16 has a valve 17
And a steam trap 18 that discharges only condensate water to the outlet side
Are attached in parallel. When vulcanizing a rubber roll or the like (not shown) placed on the shelf 4, first, the control valve 1
0, a predetermined pressure, for example, 3.2 K
G compressed air is supplied. When the compressed air pressure inside the vulcanizing can 1 reaches 3.2 KG, then the steam is supplied at a predetermined pressure, for example, 5.0 KG through the steam supply pipe 2, the control valve 7, and the spray nozzle 20. 1.8 kg of steam based on the pressure difference from the compressed air is injected into the sulfur can 1. By supplying compressed air of 3.2 KG and steam of 1.8 KG, the pressure in the vulcanizing can 1 becomes 5.0 K.
G. When it reaches 5.0 KG, the valve 9 is closed and the supply of compressed air is stopped. On the other hand, the steam is continuously supplied so that the pressure in the vulcanizing can 1 maintains 5.0 KG, so that the temperature of the saturated steam of 1.8 KG becomes 13
Since the temperature is 0 ° C., the unvulcanized rubber roll in the vulcanizing can 1 is vulcanized under the conditions of 5.0 kg, a pressure of 130 ° C. and a temperature. In the case where vulcanization is performed only by steam without supplying compressed air, under the above conditions, 1.8 kg, 130 kg
Degree C. On the other hand, when the steam pressure is set to 5.0 KG, the steam temperature rises to 158 ° C. When the vulcanization temperature condition is 130 ° C., when the vulcanization is performed only with steam without using compressed air as in the related art, the pressure is 1.8.
Because it is KG, if it is not wrapped, unvulcanized products such as rubber rolls will expand or deform due to heat. However, in this embodiment, in order to add 3.2 KG compressed air, The temperature condition is the same and the pressure is 5.0KG
, The expansion and deformation of the rubber roll can be prevented without wrapping. When vulcanization is performed by supplying steam and compressed air into the vulcanizing can 1 as in this embodiment, after a while, the steam and compressed air are separated and the vulcanizing can 1 is separated. However, by supplying the steam 22 to the entire inside of the vulcanizing can 1 from the spray nozzle 20 in a wide-angle conical shape, the steam and the compressed air are mixed, and the temperature distribution in the vulcanizing can 1 varies. Can be smaller. In the state shown in FIG. 1, only the upper spray nozzle 20 injects steam, and the lower spray nozzle 20
Is in a state in which steam is not injected, but after that, the injection in the upper portion is stopped, the injection from the lower portion is performed, and the steam is alternately injected from the upper and lower spray nozzles 20. The temperature distribution can be made uniform. As described above, according to the present invention, vulcanization is performed by maintaining the inside of a closed container at a desired temperature and pressure with steam and compressed air, thereby eliminating the need for wrapping. The process can be simplified and the working time can be reduced. By installing a spray nozzle in the vulcanization can, steam can be supplied to almost the entire inside of the vulcanization can, and the temperature distribution can be made uniform by stirring and mixing with compressed air to obtain uniform vulcanization. Can be prevented.

[Brief description of the drawings] FIG. 1 is a configuration diagram showing an embodiment of a steam vulcanizing apparatus of the present invention. [Explanation of symbols] 1 vulcanizing can 2 Steam supply pipe 3 Compressed air supply pipe 7 Control valve 10 Control valve 16 Condensate drain pipe 20 spray nozzle

Claims (1)

Claims: 1. An unvulcanized rubber material is placed in a closed container, steam is supplied from a steam supply pipe into the container, and the steam is brought into direct contact with the unvulcanized material. In the vulcanizing method, a compressed air supply pipe for supplying compressed air at a predetermined pressure is connected in the closed vessel, and the inside of the closed vessel is vulcanized in a mixed state of compressed air and steam, and a steam supply pipe is connected. A steam vulcanizing apparatus characterized in that a spray nozzle is attached to a container side end.