Introduction to rubber processing and safety issues - HSE

an explosive reaction, involving generation of steam and an associated pressure rise caused by accidental
mixing of hot salt and cold water.
Control the risks by having regular maintenance; correct operator training; and having the correct initial design.
Interlocks are required between the salt and water pumps. Fit level controls to prevent water entering the molten salt
in the curing chamber. There should also be pressure relief before access into the chamber is possible. Suitable
protective clothing is required for maintenance operations.
The pressurising medium is normally compressed air. The salt and water reservoirs are pressure vessels so subject
to the requirements of the Safety of pressure systems. Pressure Systems Safety Regulations 2000. See the Safety
of Pressure Systems (ACoP) - L122 for more information.
Other continuous vulcanisation processes
These include:
rotocure - a system of heated drums over which the rubber is passed;
hot air or infra-red ovens;
fluidised beds;
microwave systems.
Microwave and infra-red curing ovens should be enclosed, with access doors interlocked with the electrical supply.
There may also be mechanical hazards on the following that will require safeguarding:
conveyors;
rotocure rolls (nips);
powered movement of oven/curing unit doors.