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        大羽塑料薄膜官網歡迎您!

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        大羽塑料薄膜

        20年塑料薄膜生產廠家根據應用需求量身定制各種塑料薄膜
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        熱門關鍵詞: 防水膜農用地膜塑料薄膜廠家pe薄膜包裝膜定制

        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 » 常用的農膜有哪些?

        常用的農膜有哪些?

        文章出處:   責任編輯:   發布時間:2016-06-22 09:02:00    點擊數:-   【

        農用薄膜是應用于農業生產的塑料薄膜的總稱,按用途和用法可分為地膜、棚膜、農牧用膜等。地膜除透明地膜外,還有有色地膜,除草、降解、光轉換等功能地膜。棚膜按農作物的生長需要,可分為普通塑料棚膜、功能塑料棚膜(包括防老化、防霧滴、保溫、防塵等)、控制性功能塑料棚膜(如光譜選擇、光譜轉換、功能控制棚膜等)。農牧用膜包括牧草青貯膜、果蔬保鮮膜、糧食貯存膜等。

        近年來,隨著農牧業生產需求的變化和科技的不斷進步,對農膜的要求越來越高,各種新型薄膜不斷開發上市?,F將常用的農膜介紹如下:

        輕薄型薄膜。這種薄膜厚度只有普通薄膜厚度的一半,因此重量減輕一半,相應的使用成本也降低一半。這種薄膜的透光度和保溫性能也優于普通薄膜,但應用在農業生產中,回收起來比較困難。

        多用途薄膜。此種薄膜除用做水稻、棉花、玉米、烤煙、花卉的育苗和大田覆蓋外,還可利用它做防洪膜,為灌渠和貯水池做內襯,從而大大提高水的利用系數。

        長壽薄膜。為使薄膜耐老化、易回收,在生產過程中加入防老化劑,可使薄膜的壽命延長2~4倍。地膜在揭膜后仍有一定強度,回收后仍可使用,既降低了成本,又可減少田間的殘膜量。

        防蟲薄膜。它是用普通乙烯和低密度乙烯制成的多層薄膜。這種膜只向四周反射陽光中的紫外線,而抑制可見光的反射。害蟲因忌怕紫外光而不敢靠近薄膜,故能起到防蟲效果;對于防治抗藥性強的蚜蟲、紅蜘蛛等特別有效。

        防病薄膜。這是專用薄膜,如玉米地膜、棉花地膜、瓜菜地膜等。它是利用不同作物具有專一性的病害而生產的。防病薄膜生產過程中,有針對性地加入某種特定的農藥。這種地膜無殘留、無污染、防病效果顯著,不少地方已大量用于種植業。

        除草薄膜。除草薄膜是一種新興的農用塑料薄膜,是普通地膜生產過程中加入黑色母?;蛘呋瘜W除草劑制成的。除草地膜可分為含除草劑的地膜和含陽光屏蔽劑的除草地膜。

        含除草劑的除草地膜,是把除草劑、助劑和樹脂預混合好,或做成母粒,再在普通地膜擠出機上經吹塑成膜。這種地膜生產工藝簡單,設備投資少,生產普通地膜的設備均可生產。

        含陽光屏蔽劑的除草地膜,是以高壓聚乙烯樹脂、線型低密度聚乙烯樹脂為基料,加入黑色母粒和抗氧化劑、紫外光吸收劑經吹膜機生產而成的黑色薄膜,由于不含除草劑,目前在高效農業上廣泛運用。

        降解薄膜。是為適應社會對于環境保護的需要而產生的一種新型農用薄膜。降解性農膜按照降解機理可分為光降解地膜、熱氧降解地膜、淀粉填充地膜等。由于它的主體成分實際上還是聚乙烯,使用后仍然難以完全降解,且裂解成碎塊埋在土壤中也無法回收,極易造成二次污染。只有全生物可降解膜,才能實現完全降解,目前,國內外對于全生物可降解膜的研發已經取得突破性進展,目前國內也有新產品問世,正在試驗應用。

        此外,按照農膜結構,可分為單層塑料膜、多層共擠塑料膜;按加工方法可分為壓延薄膜、吹塑薄膜、T型模頭擠出薄膜及其他類型;按農膜原材料,可分為聚氯乙烯(PVC)塑料膜、聚烯烴(包括LDPE、HDPE、LLDPE、mLLDPE、EVA等)塑料膜。按農膜的性能與功能還可分為有滴薄膜、無滴薄膜、透明薄膜、有色薄膜、熒光薄膜、光選擇薄膜、耐高溫薄膜、耐寒薄膜、防塵薄膜、保溫薄膜、散光薄膜、抗粘連薄膜和多孔薄膜等。


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