Injection Molding
5 조회수
TPU scorch marks and burnt
문제 현상
Local blackening and carbonization of the product, mostly near the gate or at the end of the melt flow.
원인 분석
TPU is sensitive to shear; excessive injection speed causes shear heat decomposition near the gate; excessive melt temperature, too long residence time, or poor mold venting also cause scorch marks.
해결 방법
①reduce injection speed; ②reduce barrel temperature to prevent overheating; ③shorten barrel residence time; ④add vents to the mold and clean blockages; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
핵심 요약
For TPU scorch marks, suspect shear overheating first; compared with SEBS-based TPE, TPU is more sensitive to shear, and speed control is the first means of preventing scorching; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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