SVP INSTRUCTION MANUAL Page 14
SHAW-ALMEX INDUSTRIES LIMITED 49909-010
Jun 2017
1. Connect the pressure control hose to the pressure bag connection(s).
2. Pressurize the vulcanizer to operating pressure. Be sure air or fluid is entering the pressure bag(s) before
commencing to heat the platens. A simple check to ensure that each bag is pressurized is to wiggle the
pressure bolts. They will not move when there is pressure in the bag.
3. To de-pressurize the vulcanizer, slowly open the pressure release valve.
5.2. Heating the Vulcanizer
If not familiar with the operation of the temperature controller refer to the temperature controller manual.
Safety: Never leave the vulcanizer operating while unattended.
Important: There should not be water in the platens before heating or the platen heat will not be uniform.
Important: The element life will be significantly reduced if the vulcanizer is heated without being assembled
and pressurized.
1. Adjust the set point value of the temperature controller. It may be necessary to cycle power to the
temperature controller OFF and ON to reset the set point temperature. Check the temperature controller
manual.
2. Turn the switches on the temperature controller to the ON position. This may be labeled AUTO (Mark
VIII),or 1A (T4).
Safety: The platens will get hot.
3. Heat to set point temperature and then time the cure according to the belt manufacturer’s specification.
Monitor the platen temperature on the controller display as well as with the stem thermometers or
thermocouples inserted into the holes drilled into the platen edge.
4. When the cure is finished, turn the switches on the temperature controller to the OFF position.
5.3. Cooling the Vulcanizer
The platens can be allowed to cool naturally after they are switched off. Natural cooling can take several hours
so use this method only if cooling time is not important. The platens can also be cooled with compressed air that
is faster but will still take several hours.
The preferred method of cooling is to pump water through the platens. The cooling time depends on many
factors such as start and finish platen temperatures, cooling water temperature, water pressure, flow resistance
and platen area. Multiple platen arrangements take the longest to cool because of the greater area and the
restriction at the cooling ports. Generally the vulcanizer will cool to a safe handling temperature in five to ten
minutes per platen set.
The cooling hoses should be connected to platens during the press assembly so the cooling ports are easily
accessible and the platens are not hot.
The cooling ports on SVP platens are 1/8” NPT. Platens made in 1994 and earlier may have 1/4” NPT cooling
ports.
Important: The platens should be cooled while the vulcanizer is still under pressure and the platen heating must
be turned off.
Safety: The cooling water may discharge from the platen initially as steam creating a burning hazard.
Ensure the cooling water discharge is not directed at any person or injury could result.
1. When the cure time has been completed and the temperature controllers are switched off, turn on the water
supply to cool the upper and lower platens. When using an automatic temperature control, leave the
temperature controller connected to the platens so the temperature can be monitored.
2. When using the Hydraulic Pressure Pump for cooling, refer to pump manual.
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