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排气不良是注塑缺陷(烧焦、短射、气泡)的主要成因之一。排气槽应布置在熔料流动末端、分型面处以及镶件配合面。标准排气槽深度参考:PP/PE取0.02-0.03mm,ABS/PC取0.03-0.05mm,PBT/PA取0.01-0.02mm,深度过大会产生飞边。对于深腔模具,可在顶针或滑块上增设排气间隙(单边0.02-0.03mm),也可设计真空辅助排气系统改善排气效果。
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