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TPU Thick‑Wall Molding: Distinguishing Shrinkage Sink Marks from Short‑Shot Defects Sep 07 , 2026
Thick-wall TPU injection-molded parts (wall thickness ≥10 mm) often suffer from surface dents or depressions. It is easy to confuse shrinkage‑induced sink marks with short‑shot (incomplete filling) defects. Although they look similar to the naked eye, their root causes, diagnostic logic, and corrective measures are completely different. Misdiagnosis leads to wasted time and incorrect machine adjus...

Tags : TPU Thick‑Wall Molding Shrinkage Sink Marks Short‑Shot Defects

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Sink Mark Improvement on Soft 65A TPU — A Practical Analysis Based on Remote Feeding and Thermal Shrinkage Oct 12 , 2026
Background: 65 Shore A polyether-based soft TPU Defect: Extensive surface waviness and sink marks on the test specimen Adjustments: 2nd-stage injection pressure 35→38; 3rd-stage injection pressure 30→35; 1st-stage packing pressure 30→35; 2nd-stage packing pressure 30→35. Hold switch method and hold time (12.0s) remain unchanged. Result: Flat specimen surface with sink marks eliminated. 1. Debunkin...

Tags : Sink Mark Improvement Soft 65A TPU Thermal Shrinkage

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