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綜合分析不同薄膜包裝技術及其應用領域中的拉伸方法和薄膜厚度要求

在托盤和薄膜之間進行直接拉伸。這種方法拉伸比低(約15%至20%)。如果拉伸比超過55% ~ 60%，超過了薄膜原來的屈服點，薄膜的寬度減小，穿刺性能也喪失，薄膜容易斷裂。而且在60%的拉伸率下，拉力...

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