| 摘要 |
To the end of producing high quality film from thermo-plastic resin through inflation molding, there is provided an air ring which has a plurality of slits for guiding cooling air therethrough onto the film. These slits are defined by a plurality of frusto-conical channel defining bodies which are arranged like a set of nested boxes and are provided with different exit angles at their outlets. Through appropriate distribution of the air outlets for cooling the film, a uniform inflation molding becomes possible, allowing a greater molding speed at the same time. The broader ends of the channel defining bodies are mutually threaded in such a manner that they may be independently adjusted along an axial direction. With additional provision of a retractable annular plate at the outlet of a main cooling air channel and proper adjustment of the channel defining bodies, the air ring may be adapted to molding dies of different diameters.
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