Plastic and nonmetallic article shaping or treating: processes – Direct application of fluid pressure differential to... – Production of continuous or running length
Patent
1989-02-03
1991-07-09
Thurlow, Jeffery
Plastic and nonmetallic article shaping or treating: processes
Direct application of fluid pressure differential to...
Production of continuous or running length
264216, 264237, 425 721, 425224, 4253261, 4253871, B29C 3942
Patent
active
050304097
ABSTRACT:
An end portion-treating method and apparatus for manufacturing a synthetic resin film by first extruding through a slit die or coating with the use of a coater onto or on a conveyor belt or drum a fluid synthetic resin composition in a smooth layer form, and then solidifying it. Gas is blown at both end portions of the film of the fluid synthetic resin composition extruded onto the surface of the conveyor belt or drum to change the sectional form of both end portions. A synthetic resin film is obtained without creasing in the process of drying or cooling of the film or lifting of the film off the surface of the conveyor belt. A film of superior quality is thus provided. Also, since both longitudinal end portions of the film need not be trimmed off and discarded, the film manufacturing effifiency is improved, and the manufacturing cost is reduced substantially.
REFERENCES:
patent: 3121915 (1964-02-01), Heller, Jr.
patent: 3141194 (1964-07-01), Jester
patent: 3597515 (1971-08-01), Widiger
patent: 4874571 (1989-10-01), Muller
Hisanaga Akinori
Sakubata Takashi
Yoshioka Tetsuo
Kanegafuchi Kagaku Kogyo & Kabushiki Kaisha
Thurlow Jeffery
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