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条纹是铝合金型材表面的主要缺陷之一.从型材结构、铝液、模具设计、加工工艺几个方面剖析了条纹产生的原因,并提出了行之有效的预防措施“,”The streaks are main defects of aluminium profiles surfaces.The causes of streaks are analyzed from the constitution of profile,die design,die make.The preventive methods of streaks are introduced.