| abstract |
(57) [Summary] [PROBLEMS] Even if molding is performed at high speed, the optical characteristics such as tear strength and impact strength are not reduced and transparency (haze) and gloss (gloss, clarity) are not deteriorated. In addition, the present invention provides a method for forming an inflation film that can easily change the film size without causing a reduction in productivity or loss of a product until a replacement work of an internal stabilizer, an air ring, or the like, or a steady operation. . SOLUTION: A molten bubble formed by extruding a resin composition containing polyethylene having a density of 0.86 to 0.94 g / cm 3 and not more than 50% by weight of another polyolefin from a die is formed into a maximum bubble diameter (D 2 ). / Minimum diameter of bubble (D After expanding the ratio of 1 ) to 2.0 to 5.0, the product diameter (D 3) / the maximum diameter (D 2) ratio the inflation molding method to pick up reduced in diameter to 0.9 to 0.5 of the bubble. |