Extended film and method for manufacturing thereof

Abstract

The present invention aims to provide an extended film and a method for manufacturing the same. The extended film (10) includes at least a substrate layer (3) and a barrier layer (5). The substrate layer (3) is mainly composed of high-density polyethylene with a density of 0.950 g / cm3 or higher, and the barrier layer (5) is mainly composed of butene glycol-vinyl alcohol copolymer. In the extended direction of the film, the heat shrinkage rate is less than 5% when heated at 120°C for 10 minutes. The substrate layer (3) and the barrier layer (5) are separated by stirring in water at 25°C for one hour. The object of the present invention is to provide an extended film and a method for manufacturing the same. According to the present invention, the extended film (10) comprises at least a base layer (3) and a barrier layer (5), where the base layer (3) is primarily composed of a main component comprising a high-density polyethylene having a density of 0.950 g / cm³ or more, and the barrier layer (5) is primarily composed of a main component comprising a butenediol-vinyl alcohol copolymer. The extended film has a heat shrinkage rate of 5% or less when heated in a stretching direction of the film at 120 °C for 10 minutes, and the base layer (3) and the barrier layer (5) are separated from each other by stirring the extended film in water at 25 °C for 1 hour.

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