Equipment for extrusion molding of polyvinyl chloride double-wall corrugated pipes
Release date:
2023-09-18
The extrusion equipment used for manufacturing double-wall corrugated PVC pipes is essentially the same as that for single-wall corrugated pipes; the only difference lies in the die used to form the pipe parison. However, since double-wall corrugated pipes are typically produced in larger diameters and require a greater amount of raw material, it is advisable to use a twin-screw extruder, which offers superior performance.
In addition, the die structure for forming the parison of a double-wall corrugated pipe differs from that of a single-wall corrugated pipe in the following respects: the straight section of the die‑formed parison is longer; there are two melt‑diverting cones and two layers of melt‑flow channels, with the molten material in each channel forming the inner and outer wall layers of the double-wall corrugated pipe, respectively; between the inner and outer melt‑flow channels there is also a compressed‑air inlet passage, through which compressed air is injected to inflate the outer wall, causing it to conform tightly to the corrugated die and thereby define the pipe’s corrugated profile; furthermore, the central bore of the inner mandrel can accommodate a heater and includes passages for introducing compressed air and cooling water.
The common feature of the two mold structures is that both are equipped with a porous plate at the front of the melt‑diverting cone. Adjustment of the parison wall thickness is achieved by regulating the relative movement of the diverting cone and the mandrel, thereby varying the gap between the mandrel and the die; meanwhile, the die, which extends into the space between the two half‑corrugated molds, remains fixed and cannot be moved.
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