Injection Molding
6 조회수
Flow Marks and Ripples on the Surface of PE Injection Molded Products
문제 현상
Ripple-like flow marks or concentric-circle ripples around the gate appear on the surface of PE products, obvious on high-gloss surfaces.
원인 분석
The melt front temperature drops too fast or the advance speed is unstable, leaving ripples on the cavity surface; low mold temperature, unreasonable injection speed profile, and too small gate all cause front instability.
해결 방법
①Optimize the injection speed profile to keep the front stable; ②Appropriately increase mold temperature and melt temperature; ③Enlarge the gate to reduce throttling; ④Check the temperature uniformity of the hot runner; ⑤Adjust the gate position to improve the flow state if necessary.
핵심 요약
PE flow marks and ripples = a 'front management' problem: stabilize speed, maintain temperature, and enlarge the gate — the three axes; what it reflects is filling stability, which cannot be covered up by surface treatment.
이 정보가 도움이 되었나요?
0 명이 도움이 되었다고 합니다
의견 주셔서 감사합니다!