Heat-shrinkable polystyrene based resin film roll and method for production thereof, and heat-shrinkable label

Abstract

A film roll comprising a heat-shrinkable polystyrene based resin film wound into a roll, characterized in that, each of the samples taken out from the roll exhibits, in a heat shrinkage test under the condition of the immersion in a hot water at 85 DEG C. for 10 sec, a heat shrinkage rate in the main shrinking direction of within +-5% relative to an average rate of the total samples; a heat-shrinkable polystyrene based resin film taken from the roll; a heat-shrinkable label comprising the film; a method for producing the heat-shrinkable polystyrene based resin film roll which comprises using raw material chips having a specific form, or using a hopper having a specific shape for feeding raw material chips to an extruder, or limiting the variation of the surface temperature of a film in a specific production step to a specific range.

Description

technical field

[0001] The present invention relates to a heat-shrinkable polystyrene-based resin film roll obtained by winding a heat-shrinkable polystyrene-based resin film suitable for use as a packaging material for covering, bundling, and sealing containers, and a method for producing the same. Heat shrinkable label. Background technique

[0002] Since the heat-shrinkable film has a so-called shrinkable function, it can be laminated and integrated on the object through the film's own shrinkage force and formability without the use of fixing mechanisms such as adhesives and fastening tools. Therefore, it can not only protect the object mechanically through lamination and covering, but also has functions such as binding and sealing. Furthermore, when the heat-shrinkable film itself has a special function, it can be added to the object by post-processing such as lamination. This property can be effectively utilized in the field of packaging whose main purpose is to prese...