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        當前位置: 首頁 » 大羽塑料薄膜新聞中心 » 大羽新聞中心 » 大羽動態 » PE薄膜的材質以及生產流程

        PE薄膜的材質以及生產流程

        文章出處:   責任編輯:   發布時間:2016-04-21 08:59:00    點擊數:-   【

        PE薄膜,即聚乙烯薄膜,是指用PE薄膜生產的薄膜。PE膜具有防潮性,透濕性小。聚乙烯薄膜(PE)根據制造方法與控制手段的不同,可制造出低密度、中密度、高密度的聚乙烯與交聯聚乙烯等不同性能的產品

        PE膜具有防潮性,透濕性小。聚乙烯薄膜(PE)根據制造方法與控制手段的不同,可制造出低密度、中密度、高密度的聚乙烯與交聯聚乙烯等不同性能的產品。

        低密度聚乙烯

        其密度約為0.92g/cm3左右。低密度聚乙烯薄膜的透明度與熱封性好,能防水、防潮;抗張強度低,拉伸伸長率大,容易發皺,0.03mm以下的薄膜,張力控制宜小,并且各處張力要恒定,特別是受熱時更易變形,造成套色困難。因此干燥時,薄膜表面溫度不要過高(在55度以內)。按成膜工藝的不同,可分為吹塑薄膜(IPE)、流涎薄膜(CPE)、低發泡薄膜等幾種。IPE薄膜的抗張強度和開口性比CPE薄膜好,采用正面印刷,可作食品袋、服裝袋等;CPE薄膜厚度均勻,表面光澤度、透明度和熱封性比PE好,可正反面印刷,但生產成本高。CPE薄膜主要用作復合袋的內層以及化妝品、醬菜和糕點的包裝;低發泡薄膜裝飾性好,質地厚實,不易拉伸變形,采用正面印刷,用作年畫、商標和手拎袋等。

        中密度聚乙烯

        它的密度約在0.93~0.94g/cm3性能介于高密度與低密度聚乙烯之間。

        高密度聚乙烯

        密度在0.94—0.965g/cm3。高密度聚乙烯薄膜的耐熱性、機械強度比低密度聚乙烯薄膜好,拉伸伸長率小,薄膜厚度一般在0.03mm以上,但透明度差。采用正面印刷,主要用作背心袋、垃圾袋和內襯袋等。

        交聯聚乙烯

        由于它較其它的聚乙烯產品有更高的耐熱性、拉伸強度、熱收縮率和阻隔性,其用途在進一步的擴大,2014年大多用作熱收縮包裝薄膜用。

        一般來說,隨著密度的上升,機械性能和阻隔性能會相應提高,耐熱,生也好。同一密度的聚乙烯,由于成膜工藝的不同,它們之間也有不同的性能。這是因為流涎法能快速冷卻,結晶度低,透明度較高,濁度小,但分子排列更趨無規則狀態,所以阻隔性較小,即透過率較大,延伸率較低,抗撕裂性差。

        吹膜機是將PE塑料粒子加熱融化再吹成薄膜的機械設備。首先,將干燥的聚乙烯粒子加入下料斗中,靠粒子本身的重量從料斗進入螺桿,當粒料與螺紋斜棱接觸后,旋轉的斜棱面對塑料產生與斜棱面相垂直的推力,將塑料粒子向前推移,推移過程中,由于塑料與螺桿、塑料與機筒之間的摩擦以及粒子間的碰撞磨擦,同時還由于料筒外部加熱而逐步溶化。熔融的塑料經機頭過濾網去雜質從模頭??诔鰜?,經吹脹、風環冷卻之后經人字板壓, 由牽引輥卷取將成品薄膜卷成筒。


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