| 摘要 |
PURPOSE: To provide a multi-ply film of high impact strength and tear strength, substantially having less than 100μm of a thickness by comprising at least three layers of polyolefin homopolymer and/or copolymer, where two outer layers consist of thin films of polyolefins of ultrahigh molecular weight, and an interposed layer consists of fibers or fiber structures of polyolefins of ultrahigh molecular weight. CONSTITUTION: A multiply film comprises at least three layers, and each layer comprises at least one layer of fibers or fiber structures, adjacent to a polyolefin film layer of ultrahigh molecular weight. The thin films adjacent to layer of fibers or fiber structures, form the outer layers preferably consisting of polyolefins of ultrahigh molecular weight like the fibers or the fibers forming the fiber structures, and has 500,000-5,000,000 G/mol or more of a weight average molecular weight in a case of the film, and 500,000-3,000,000 G/mol or more of the weight average molecular weight in a case of the fiber. The multi-ply film has not more than 100μm of thickness, has high impact strength and tear strength values, and particularly effective in the manufacture of a parachute, a balloon or the like.
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