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Parallel Twin Screw Barrel
D91/33 Parallel Twin Screw Barrel
Video
Technical Specification
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Item |
Standard Technical Parameter |
|
Type |
Parallel Twin Screw Barrel |
|
Material |
38CrMoAlA |
|
Nitrided Hardness |
HV 900–1000 |
|
Depth of Nitrided Layer |
0.5–0.7 mm |
|
Brittleness After Nitriding |
≤ Grade 2 |
|
Inner & Outer Diameter Tolerance |
≤ 0.02 mm |
Product Overview
The D91/33 parallel twin-screw barrel is built for high-output compounding applications. Its 91mm diameter and 33:1 L/D ratio provide extended residence time for thorough melting, mixing, and degassing of various polymers, including PVC, engineering plastics, and filled compounds. The intermeshing, co-rotating screws offer excellent self-wiping action to prevent material buildup and degradation. Both screws and barrels are constructed from wear-resistant bimetallic alloys with hardened liners to withstand abrasive fillers, glass fibers, and corrosive additives. This system is widely used in masterbatch production, wood-plastic composites, and PVC dry blend compounding.
Application Scenarios
The D91/33 parallel twin screw barrel is engineered for high-output polymer compounding operations that demand extended residence time, thorough mixing, and precise temperature control. In masterbatch production, the 33:1 L/D ratio and 91 mm screw diameter provide sufficient residence time for thorough pigment dispersion and carrier resin melting, producing concentrated colorants used at low addition rates in downstream processing. Wood-plastic composite (WPC) manufacturing lines use this barrel configuration to compound wood flour or rice husk fillers with polyethylene or polypropylene matrices, where the intermeshing co-rotating screws ensure uniform filler distribution throughout the polymer matrix. Glass-filled engineering plastic compounding relies on the barrel's wear-resistant bimetallic construction to handle the abrasive nature of glass fiber reinforcements while maintaining precise screw clearances for consistent compound properties.
FAQ
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QQ: What is the L/D ratio of the D91/33 screw barrel and why is it important?
A: The L/D ratio is 33:1 (length 33 times the diameter). A higher L/D ratio provides longer residence time for more complete melting and mixing, which is particularly beneficial for filled compounds and materials requiring extended processing. -
Q: What materials are used in the construction of the screw and barrel?
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Q: What types of screw element configurations are available?