SWT Extrusion Knowledge Center
Professional technical articles, troubleshooting guides, process knowledge, and practical solutions for sheet extrusion and thermoforming.
Editor Selection
Learn why calcium carbonate is added to plastics, how GCC, PCC, nano and activated CaCO3 differ, and how to select fillers for PVC, PE, PP, PLA and PBAT processing.
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New From Our Engineers
Practical production knowledge for sheet extrusion and thermoforming teams.
Learn how an extruder back pressure valve controls melt pressure, improves melt homogenization, removes bubbles, and stabilizes extrusion output for better product quality.
Learn how to identify and eliminate gel defects, fish eyes, black specks, and hard spots in extrusion, blown film, cast film, and extrusion coating through a practical four-step troubleshooting method.
Why does molten polymer escape from an extruder vacuum vent? Learn the four main causes and a practical troubleshooting sequence, from feed rate and vacuum adjustment to screw configuration and vent-port design.
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