Textured surface polypropylene film

Details Textured surface polypropylene film Textured surface polypropylene film

1979-03-15

1981-03-10

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264560, 264565, 2642095, 2642105, 264237, 264327, 264DIG47, B29F 308

Patent

active

042553814

ABSTRACT:
An improved process of producing a predetermined textured surface on a polypropylene film is disclosed including the steps of extruding the polypropylene into a stalk, cooling the stalk to crystallize the polypropylene, passing the stalk through a heating zone and biaxially stretching the stalk into a thin film. The stalk emanating from the extruder has a section primarily temperature controlled and correlated to the stalk velocity to cause extensive, continuous and uniform spherulite formation with a predominantly type III polypropylene crystal structure on the outer surface of the stalk, which upon subsequent inflation of the stalk causes the desired texture to occur.

REFERENCES:
patent: 2720680 (1955-10-01), Gerow
patent: 3060515 (1962-10-01), Corbett
patent: 3178495 (1965-04-01), Richard et al.
patent: 3223764 (1965-12-01), Kahn et al.
patent: 3235632 (1966-02-01), Lemmer et al.
patent: 3345447 (1967-10-01), Grant
patent: 3415796 (1968-12-01), Souder et al.
patent: 3585467 (1971-06-01), Linzey
patent: 3619454 (1971-11-01), Sakata et al.
patent: 3724043 (1973-04-01), Eustance
patent: 3900774 (1975-08-01), Iijima
Clegg et al., Plastics "The Effect of Extrusion Variables on the Fundamental Properties of Tubular Polythene Film," 4-1961, pp. 114-116.

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