| 摘要 |
An opaque, biaxially oriented heat shrinkable polymeric film structure of lustrous satin appearance is described which comprises: (a) a heat shrinkable thermoplastic polymer matrix core layer within which is located a strata of voids; positioned at least substantially within at least a substantial number of said voids is at least one spherical void-initiating particle which is phase distinct and incompatible with the matrix material, the void space occupied by said particle being substantially less than the volume of said void, with one generally cross-sectional dimension of said particle, at least approximating a corresponding cross-sectional dimension of said void; the population of voids in said core and the thickness of said core being such as to cause a degree of opacity of less than 70% light transmission; and, (b) at least one void-free heat shrinkable thermoplastic skin layer affixed to a surface of core layer (a), said skin layer(s) being of a thickness such that the outer surfaces thereof do not, at least substantially, manifest the surface irregularities of said core layer.
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