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收缩薄膜是一种在生产过程中被拉伸定向、具有较大内应力,在热作用下能收缩的热塑性塑料薄膜。生产方法是用吹塑或流延制出薄膜,然后在软化温度以上、熔解温度以下拉伸冷却定型。使用时在大于拉伸温度而低于熔解温度上进行热收缩包装。优点是紧贴商品,外观美,保护保洁性能好,可用作一次性的报纸的报皮,期刊用的包装纸。现在的报纸和期刊是先包上报皮再用捆扎机捆,经过两道工序。
Shrink film is a kind of thermoplastic film stretched in the production process orientation, with greater internal stress, can shrink under the action of heat. The production method is to blow or cast film, and then above the softening temperature, melting temperature below the drawing cooling stereotypes. When used in the stretching temperature is lower than the melting temperature shrink packaging. Advantage is close to the goods, the appearance of the United States, to protect the cleaning performance, can be used as a one-time newspaper cover, periodical wrapping paper. Now newspapers and periodicals are first reported on the package and then bundled with a strapping machine, after two processes.