Process for blowing film from linear thermoplastic material

Details Process for blowing film from linear thermoplastic material Process for blowing film from linear thermoplastic material

1983-10-13

1985-04-16

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264565, 425 72R, 4253261, B29D 724

Patent

active

045115303

ABSTRACT:
A process at continuous blowing of film such linear thermoplastic materials which after that the plastic melt has left an annular die, when introducing gas to the inner of the tube, forms a neck part having an essentially constant diameter and then forms a rapidly expanding main bubble whereby the speed of the film at the upper part of the neck is kept above 15 m/min.

REFERENCES:
patent: 3091807 (1963-06-01), Turner et al.
patent: 3141912 (1964-07-01), Goldman et al.
patent: 3243486 (1966-03-01), Pilaro
patent: 3265789 (1966-08-01), Hofer
patent: 3302241 (1967-02-01), Lemmer et al.
patent: 4000234 (1976-12-01), Pilgrim et al.
patent: 4204819 (1980-05-01), Ushioda et al.
patent: 4399094 (1983-08-01), Fujitani et al.

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