摘要 |
Disclosed are multi-layered thermoplastic films that have been intermittently stretched to give regions that are visually distinct from un-stretched regions. The stretched regions can be white, opaque, and non-porous, and made further visually distinct from un-stretched regions by the use of a voiding agent (filler) selected from the group consisting of calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, magnesium sulfate, barium sulfate, calcium oxide, magnesium oxide, titanium oxide, zinc oxide, aluminum hydroxide, magnesium hydroxide, talc, clay, silica, alumina, mica, glass powder, and starch. The multi-layered thermoplastic films with visually-distinct stretched regions can be formed into bags for use as trash can liners or food storage. Additionally, methods of stretching thermoplastic films to create visually distinct stretched regions include incrementally stretching a plurality of film layers, at least one of which includes a thermoplastic material and a voiding agent. |