In the production process of PVC tubing and pipe fittings, PVC pipe fittings, is due to the heat sensitive materials, even adding heat stabilizer can only be increase the decomposition temperature and increased the stability and impossible without decomposition, which requires the PVC to pipe processing temperature should be strictly controlled.
Tube blank of PVC pipe fittings is also very high temperature, in order to make the pipe to obtain a lower roughness, the correct size and geometry, when leaving the port die must be determined immediately and cooling. PVC tubing and pipe fittings are generally uses the internal pressure and external sizing method, the inner tube through compressed air to the outer surface of the pipe tightly contacted with the fixed sleeve diameter wall shape and keep a certain roundness, the general compression air pressure range in 0.02-0.05Mpa and pressure requirements stability, can set up a storage cylinder so that the compressed air pressure stable.
In addition, extrusion temperature should be determined according to the formula, the characteristics of the extruder, the nose structure, the screw speed, the temperature measuring point position, the temperature measuring instrument error and the temperature measuring point depth and so on.
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