Injection Molding
4 조회수
Flow marks (ripples) near the ABS gate
문제 현상
Concentric ripples or runner-like lines appear centered on the gate, extending into the cavity; unacceptable on appearance surfaces.
원인 분석
The melt front advancing speed is unstable and the front cools too quickly, leaving ripples on the cavity surface; small gate, low mold temperature, and improper injection speed all induce it; the essence is the manifestation of the loss of control of the front temperature and speed on the surface.
해결 방법
①Increase the mold temperature and melt temperature to maintain the front temperature; ②optimize the injection speed curve (slow—fast—slow) to keep the front stable; ③enlarge the gate or change to a fan/lap gate to reduce throttling; ④improve venting; ⑤adjust the gate position to improve the flow state when necessary.
핵심 요약
ABS flow marks are the externalization of the loss of control of the front's 'temperature and rhythm': the three axes of heating up, stabilizing speed, and large gate; high-gloss parts especially need fine front management; once ripples appear, they are difficult to cover up by post-processing.
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