China Extruder Factory

PVC pipe normally runs on a twin screw extruder, because PVC dry blend needs controlled feeding, plasticization and temperature management to process cleanly.

Conical and parallel twin screw designs both work for PVC. Which one suits you comes down to your formulation, filler content, pipe range and required output, not the word PVC on its own.

For HDPE, PE, PPR and PE-RT pipe production, a single screw extruder is the normal starting point.

Screw diameter and configuration still have to match your resin, required kg/h, pipe range and operating conditions. A larger screw is not automatically the better choice, and often it is the more expensive way to run the same pipe.

Not from pipe diameter alone. We review material, formulation, pipe diameter, wall thickness or SDR, target output and line speed together.

If you have an existing line, the capacity of the die and downstream equipment goes into the same review. That gives a real basis for choosing screw size, drive and processing configuration.

It depends how close the materials and their processing requirements are. A machine designed around a range of compatible polyolefins can cover several products with the right setup.

PVC dry blend and HDPE pellets are a different story. Their feeding and processing behavior have little in common, and changing temperature settings does not bridge that. Tell us every material you plan to process before the configuration is finalized.

They change feeding behavior, processing load, melt characteristics and wear inside the screw and barrel. All four at once, usually.

For PVC carrying CaCO3 or other fillers, we need the approximate formulation before reviewing screw geometry, torque and wear protection. Same applies when recycled material makes up a meaningful share of your production.

Output only means something attached to defined production conditions. Rather than treating a catalogue maximum like 500 kg/h as a universal figure, we define your material, formulation and production requirement first.

Where suitable material testing is available, the agreed output can go into the FAT scope. That gives both sides a reference, instead of a number with no conditions behind it.

Yes, where the existing equipment is technically suitable. The interfaces just need reviewing before manufacturing rather than after delivery.

On a replacement we normally check die connection, extrusion center height, available installation space, current line capacity, electrical requirements and any control signals needed.

Raising output? We also confirm your existing die, cooling section, haul off and cutter can carry the new rate.

Not on motor kW. That figure tells you installed drive capacity, not the electricity behind one kilogram of finished pipe.

Where energy data exists, kWh/kg is the more useful reference, provided the material, production rate and measurement boundary are stated with it. Always confirm whether the figure covers the extruder only or the complete production line. The difference is large.

The scope depends on your machine configuration and the test conditions available. Basic checks cover drive operation, screw rotation, heating and cooling control, electrical functions, alarms and safety functions.

Where material testing is included, useful data covers actual output, screw speed, motor load, melt temperature, melt pressure and continuous running time. If a complete line is assembled for the test, agreed finished pipe checks can be added.

There is no honest fixed number that covers every application. Wear depends on resin, filler content, recycled material, operating hours, processing conditions and the wear protection specified on the unit.

A standard PVC formulation and a high filler formulation produce very different wear. For demanding materials, tell us the formulation before the processing unit is specified. In production, inspect based on actual condition and performance, not because a certain number of years has passed.