Air ring for inflation film molding

Details Air ring for inflation film molding Air ring for inflation film molding

1983-08-30

1984-10-23

Hoag, Willard E.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

425378R, B29C 100, B29F 308

Patent

active

044785640

ABSTRACT:
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.

REFERENCES:
patent: 3176347 (1965-04-01), Shaul
patent: 3529047 (1970-09-01), Yoshida et al.
patent: 3819790 (1974-06-01), North et al.
patent: 4236884 (1980-12-01), Schott
patent: 4259047 (1981-03-01), Cole
patent: 4265853 (1981-05-01), Havens
patent: 4272231 (1981-06-01), Schott
patent: 4330501 (1982-05-01), Jones et al.
patent: 4373273 (1983-02-01), Church

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