Method of producing biaxially oriented film of thermoplastic res

Details Method of producing biaxially oriented film of thermoplastic res Method of producing biaxially oriented film of thermoplastic res

1986-01-29

1988-03-29

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

2642093, 264569, B29C 5528

Patent

active

047342455

ABSTRACT:
A method of biaxially stretching a tubular thermoplastic resin to provide a film, wherein air is blown against a starting point for heating and stretching the tube, from the upstream side of the starting point, at a predetermined angle relative to the feeding direction of the film. An apparatus for achieving this method includes: two pairs of nip rolls being different in circumferential speed between the pairs; a heating-stretching section interposed between the pairs of nip rolls, for heating the tube to a temperature where the tube can be stretched; and an air ring device for blowing air in the feeding direction of the film.

REFERENCES:
patent: 3325575 (1967-06-01), Last
patent: 3492386 (1970-01-01), Ohmasa et al.
patent: 3725519 (1973-04-01), Seifried et al.
patent: 3788503 (1974-01-01), Hirose et al.
patent: 3880974 (1975-04-01), Nohtomi et al.
patent: 3985849 (1976-10-01), Notomi et al.

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