Patent ID: 6291037
Filing Date: 2001-09-18
Classification: B29C,B29K,B29L,B65B,Y10T

Abstract:
A flexible packaging film which shrinks on an open topped container to form at least a part of a package for said open topped container when exposed to heat, said flexible packaging film comprising:a thin film substrate which is flexible and that contracts when heated and which is substantially transparent to radiant energy thereby remaining substantially unchanged upon exposure to radiant energy, anda susceptor material carried by the substrate, said susceptor material being sufficiently opaque to radiant energy to absorb said radiant energy and to convert said radiant energy into heat energy and said heat energy being transferred to said substrate in an amount sufficient to cause said substrate to shrink upon said packaging film being exposed to a source of radiant energy, wherein exposure to said source of radiant energy causes the packaging film to preferentially shrink.