Extrusion Process Of PVC Pipe Material

The structure of PVC pipe extrusion molding mainly by single screw extruder, screw thread, etc. shall be selected from the depth of thread for the gradient type, also can choose the mutant type screw structure, the ratio of length to diameter is relatively small, in general (12 ~ 18): 1 range selection, compression ratio (33): 1. The mould for pipe forming is a direct - through general structure.

Technological conditions for extrusion molding of PVC pipes

(1) selection of raw materials. There are many kinds of PVC resin, and the resin suitable for extrusion molding should be chosen.

(2) the drying and dehumidification of 4H should be done in the oven of 70~80 C before the raw material is put into production. The control of water content is less than 0.1%.

3. The plasticizing material is in molten state. The temperature of the extruder is 150~165 degrees centigrade, the plasticizing section is 165~180, and the homogenization section is 170~180.

(4) the molding mold temperature of the forming tube is 175~190 C.

The ratio of drafting was 1 to 1.2.

The cooling circulating water temperature is 15~22 DEG C.