Method of stretching film below the natural draw ratio without necking

摘要: A method for producing a synthetic crystalline thermoplastic resin film suitable stretching without necking including adding 5 to 300 parts by weight of filler 100 such as polyethylene on isotactic polypropylene having degree crystallization more than 60%, pressing the against rigid blade radius curvature 0.01 1.0 millimeter, bending around using fulcrum angle between 20° and 170°, moving relative while keeping constant thereby whitening film, said being conducted positively heating or after at draw ratio below natural film.