Bimetallic Parallel Twin Screw Barrel For PVC Extrusion

Product Description

The inner cavity of the parallel twin-screw barrel is designed with a double-hole through-hole structure, ensuring that the two mutually meshing screws rotate synchronously or asynchronously within a sealed space. As the core component of the extrusion system, its structural design directly determines the key process effects such as material transportation, mixing, melting, and evaporation.

Technical Specification

Material：38GrMoAlA,42GrMo

Hardness after hardening &tempering：HB280-320

Hardness &Tempering time：72 hours

Nitrided hardness：HV850-1000

Nitrided time：120hours

Depth of nitriding case：0.50-0.80mm

Nitrided Brittleness：less than grade 2

Surface Roughness：Ra0.4

Surface hardness of chromium-plating after Nitriding：>HV900

Depth of chromium -plating：0.025-0.10mm

Alloy Hardness：HRC50-65

Alloy Depth：0.8-2.0mm

Process Flow

Blanking → Rough Machining → Quenching & Tempering→ Semi Finishing Machining

→Finish Machining → Nitriding or Bimetallic Processed → Polishing→ Final Inspection→ Packing & Shipping

Application

The counter-rotating parallel twin-screw extruder barrel is mainly used for processing PVC pipes, profiles, sheets and films, wood-plastic composite materials, powder coatings, cable materials, masterbatches, etc.