Method of producing inflation film, apparatus therefor and molde

Details Method of producing inflation film, apparatus therefor and molde Method of producing inflation film, apparatus therefor and molde

1996-11-01

1999-12-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Shaping against interior of a forming surface by rotation of...

2642092, 264565, 4253261, 425381, B29C 4720, B29C 4750

Patent

active

060077603

ABSTRACT:
A method of producing an inflation film which includes the steps of melting an ultra-high-molecular-weight polyolefin in an extruder, extruding the molten polyolefin from a screw die, and blowing a gas into a molten tubular film formed by extrusion. An apparatus for producing an inflation film which includes an extruder provided with a first screw, and a screw die having an L/D of at least 5 and is provided at the end of the extruder, wherein the screw die includes a second screw which rotates independently of the first screw, a mandrel coupled to the end of the second screw and rotates together with the second screw, an outer tube die in which the mandrel is inserted, and a gas passage extending in the second screw and in the mandrel. An inflation film is composed of an ultra-high-molecular-weight polyolefin having a tensile strength at break of greater than 1660 kg/cm.sup.2 in a machine direction and greater than 1600 kg/cm.sup.2 in a transverse direction, an impact strength of greater than 9500 kg.multidot.cm/cm, a thickness of from 10 to 1000 .mu.m, an R-value of not larger than 10 .mu.m and an intrinsic viscosity (.eta.) of at least 7 dl/g.

REFERENCES:
patent: 3244781 (1966-04-01), Covington, Jr. et al.
patent: 3276075 (1966-10-01), Harwood
patent: 3387331 (1968-06-01), Billings
patent: 3879158 (1975-04-01), Enrique
patent: 4021170 (1977-05-01), Andersen et al.
patent: 4358330 (1982-11-01), Aronovici
patent: 4798696 (1989-01-01), Per
patent: 4938908 (1990-07-01), Shiraki et al.
patent: 4946371 (1990-08-01), Shiraki et al.
patent: 5290498 (1994-03-01), Shiraki et al.
patent: 5332379 (1994-07-01), Baumgarten
patent: 5417561 (1995-05-01), Shiraki et al.

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