Why a Glossary?
Extrusion involves many parts and concepts. This article explains only the basics in plain language—no machine settings, recipes, or proprietary methods.
Key Terms
Screw: Conveys and helps melt material.
Barrel: Cylindrical housing with heating zones.
Screw-Barrel Set: Central to output and quality.
L/D Ratio: Length-to-diameter; design indicator, not a universal “best.”
Zones: Discrete heating areas along the barrel.
Gearbox & Drive: Provide torque and speed control.
Vacuum: Helps remove gases in relevant applications.
Die: Shapes the molten material; works with calibration/cooling.
Buying Checklist
Service & spares, warranty/docs, references, energy & maintenance access.
FAQ
Best L/D? Depends on product/formulation.
How many zones? Depends on configuration & target product.
Which resin is best? Application-dependent.
How to notice wear? Performance drifts & visual checks; detailed diagnosis needs expertise.
Standard settings? None—each line and recipe differ.
Internal links:
80/156 Conical Twin-Screw Extruder Buyer’s Guide (2025)
10 Effective Ways to Reduce Screw-Barrel Wear
Screw-Barrel Sets: Conical Twin, Parallel Twin, Single Screw
