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        大羽塑料薄膜官網歡迎您!

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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膜特性解析

        PE膜特性解析

        文章出處:   責任編輯:   發布時間:2016-03-31 08:41:00    點擊數:-   【

        隨著我國人民生活水平的提高,國家強制居民食用加碘食鹽,對食鹽的制作和包裝都提出了相應的要求。由于食鹽的包裝袋屬食品包裝,因此衛生要求較高,一般選用無毒或低毒的PE、PET、PP和PVC(只作外層的復合膜)膜。

        聚乙烯薄膜(Polyethylene film)簡稱PE,由乙烯聚合而得到的熱塑性高分子聚合物,具有優良的機械強度、介電性和耐潮性,在低溫時能保持柔軟性和化學穩定性。聚乙烯薄膜無色、無味、無臭、無毒,呈半透明狀。它不與濕氣、油脂、化合物等發生反應,室溫時不溶于大部分溶劑,對熱的穩定性差,但能承受-70°C的低溫。熔接性好,對氧氣和二氣化碳有很好的透過性,對水蒸氣的透過性差。

        聚乙烯薄膜一般可分為低密度聚乙烯(LDPE)、中密度聚乙烯(MDPE)、高密度聚乙烯(HDPE)薄膜。

        未經處理的聚乙烯薄膜是一種較難于印刷的材料。這是因為聚乙烯無極性,化學性質穩定,不溶于大部分的溶劑,對油墨的吸附力很弱,印跡干燥后不牢固。因此在印刷之前或印刷過程中需對聚乙烯薄膜做適印性處理。

        對聚乙烯薄膜進行適印刷處理方法,通??刹捎迷陔妶鲋惺咕垡蚁┍∧け砻骐x子化或強氧化劑(如氯、臭氧、重鉻酸鉀)作用后進行短時間的氣體火焰加工。

        PE膜的透氣性較大,且隨密度的增加,其透氣性是下降的。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。

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