| 摘要 |
PURPOSE:To improve transparent degree of the film obtained by means of constructing a cooling air-room covering a frost line of bubbles for the purpose of cooling the bubble entruded from the die of the producing device for inflation film. CONSTITUTION:A lower cooler 12 is prepared on the upper surface of a cylindrical die 11 in the producing device for inflation film, and the upper cooler 10 is equiped above the cylindrical die 11 in the manner by which to frost line 17 is covered. The cooling air from the lower cooler 12 is blown against the outer surface of the bubbles 15 extruded cylindrically from an annular spouting slit 13 of the cylindrical die 11, and the bubbles are cooled. Next, cooling air is blown against the outer surface of the bubbles from a spouting port of a cooling chamber 10a in the upper cooler 10, and the frost line part 17 is cooled, thereby providing the film of high transparent degree. |
