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PP塑料打包帶的生產(chǎn)加工工藝
日期:2020-11-14 15:03:43 來源:宏展包裝

PP塑料打包帶的生產(chǎn)加工工藝:

PP塑料打包帶

第一,是擠出機的溫度一般把控在250℃到280℃,接著就是冷卻步驟,帶料出機后的溫度十分高,需要立刻放到水里冷卻,由于聚丙烯再速冷下容易形成結晶,此類結晶的結構比較疏松,容易拉伸,獲得高品質的產(chǎn)品。再其次是拉伸,拉伸的目的是希望可以提升它的縱向拉伸的性能,減少伸長率,并且拉伸必須在沸滾的水里進行,通常會采用一次拉伸法。最后便是壓花了,進行拉伸后的PP塑料打包帶會通過兩個帶花紋的壓輥,這樣一來就會被印上壓花,這樣子做的目的是為了提高 PP塑料打包帶在使用的過程中的摩擦力,不易打滑,而且看起來也會更美觀更好看。

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