Method for vulcanizing an elastomer

• US 4,422,987 A
• Filed: 11/16/1981
• Issued: 12/27/1983
• Est. Priority Date: 07/24/1981
• Status: Expired due to Term

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Sumitomo Rubber Industries Limited
• Inventors: Arimatsu, Toshio
• Primary Examiner(s): WELSH JR, MAURICE
• Application Number:
  US06/321,929
• Time in Patent Office: 771 Days
• Field of Search: 264/40.1, 264/40.3, 264/40.6
• US Class Current: 264/40.1
• CPC Class Codes: B29C 35/0294 using tempering units for temperature control of moulds or cores
• CPC Class Codes: B29C 35/045 using gas or flames
• CPC Class Codes: B29C 35/049 using steam or damp
• CPC Class Codes: B29D 2030/0673 the vulcanizing fluids being combinations of different kinds of fluids, e.g. steam and nitrogen
• CPC Class Codes: B29D 2030/0675 Controlling the vulcanization processes
• CPC Class Codes: B29D 30/0601 Vulcanising tyres; Vulcanising presses for tyres
• CPC Class Codes: B29K 2021/00 Use of unspecified rubbers as moulding material
• CPC Class Codes: B29L 2030/00 Pneumatic or solid tyres or parts thereof conveyor belts B29L2031/7092; drive belts B29L2031/7094; fourdrinier belts B29L2031/733

Abstract

The invention relates to a method for vulcanizing an elastomer, such as tire, fender, sleeve, hose, etc., set in a vulcanizing chamber by use of a mixed fluid comprising a low enthalpy gas and a high thermal capacity thermal fluid, said mixed fluid being obtained by introducing said gas and fluid each independently into the vulcanizing chamber for direct mixing in said vulcanizing chamber, the temperature, pressure and flow rate necessitated for the vulcanization of the vulcanizable elastomer being adapted to be controlled by a temperature sensor and a pressure sensor provided inside the vulcanizing chamber thereby making it possible to obtain proper vulcanization without the conventional impediments of surface bareness or imperfect adhesion in the part of the carcass due to insufficient exhaust in air.

Claims

1. In a method for vulcanizing an elastomer set in a vulcanizing chamber by use of a fluid of a low enthalpy gas and a high thermal capacity fluid, the improvement wherein the said gas and thermal fluid are mixed directly in the vulcanizing chamber and controlled under optimal pressure and temperature conditions suitable for vulcanizing the elastomer by means of a controller which operates in response to a pressure sensor and temperature sensor located within the vulcanizing chamber.

2. The improvement according to claim 1 in which optimal pressure and temperature conditions are predetermined and stored in said controller and wherein the vulcanizing chamber contains three separate lines connected to the vulcanizing chamber for (1) supplying said low enthalpy gas, (2) the high thermal capacity fluid and (3) an exhaust line, said lines each provided with automatic control valves, and wherein the automatic control valves which determine the flow rate in each of said lines are controlled by said controller which operates in response to the temperature and pressure sensor within the vulcanizing chamber, as the temperature and pressure deviates from said predetermined vulcanizing conditions.

3. The improvement according to claim 2 in which the high thermal capacity fluid is steam.