Adjustments to pressure and vacuum are necessary when manufacturing products made from rubber materials, including products from tires to hoses to rubber bands.
During manufacturing, rubber material is poured into a mold where you apply pressure to push the material into the mold while it’s being heated. As it passes out of the heat range, water is often used to control the temperature.
A low pressure is needed to push the rubber into the mold, conforming it to the shape of the mold and forcing it to adhere. As it comes out of the tube, pressure is applied in a vacuum as well as to the outside to create and calibrate the wall thickness of the product.
Proportion-Air’s closed loop technology provides the needed adjustments to air pressure, both for shaping the rubber and the water pressure to cool the mold and control temperature. Our technology is accurate, adjustable and repeatable.
Case In Point
One company was using a complicated back pressure concept, limiting the flow to the back pressure regulator. They were using shop air and asked us to upgrade their flow control back pressure regulator system for low pressure tube extrusion. Instead of undertaking the expense of upgrading their current concept, we proposed a pressure reducing concept. This solution would use one device, not three or four. With fewer moving parts, it would be streamlined, faster and output a better product without creating the tube bulges they were currently experiencing. This was a workable solution because our device works even with very low pressure levels (e.g. two inches of water column).
The closed-loop technology from Proportion-Air can provide the needed adjustments and monitoring for a number of applications including:
- Adjusting levels of saturated steam used in curing rubber materials.
We can simplify how you control your steam temperature. The complicated PID loops found in other temperature control systems are not necessary because our system simplifies how you control your steam temperature. This is because we understand the relationship…that is, the temperature of saturated steam is directly proportional to the pressure.
- Adjusting the speed at which rubber material passes through a heating apparatus when manufacturing medical tubes.
- Adjusting release spray, which is used to keep finished rubber products from sticking to molds.
- Correcting tension on rolled rubber materials.
- Controlling the level of a vacuum in a cooling chamber to maintain and correct wall thickness.