Apparatus and process for producing polyolefin film

Details Apparatus and process for producing polyolefin film Apparatus and process for producing polyolefin film

1985-10-25

1987-06-09

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

2642091, 4253261, 425376A, 425380, 425467, B29C 4720

Patent

active

046719180

ABSTRACT:
An apparatus and process for the extrusion of linear low density polyolefins. The apparatus comprises an extruder die including a cylindrically shaped central opening; and a die pin held within the central opening and forming, with the extruder die, an extrusion inlet and an extrusion outlet. The extruder die and the die pin also form a relaxation zone to receive a polyolefin conducted through the extrusion inlet and to relieve stresses in the polyolefin; a compression zone to receive the polyolefin from the relaxation zone and to compress the polyolefin into a tubular shaped film; and a stabilization zone to receive the polyolefin from the compression zone, to stabilize the shape of the tubular film, and to conduct the tubular film to the extrusion outlet.

REFERENCES:
patent: 3666390 (1972-05-01), Gerow
patent: 3879158 (1975-04-01), Schele
patent: 4360494 (1982-11-01), Kurtz
patent: 4395221 (1983-07-01), Herrington
patent: 4473527 (1984-09-01), Fujisaki et al.
patent: 4522776 (1985-06-01), Ramamurthy
patent: 4552712 (1985-11-01), Ramamurthy
patent: 4554120 (1985-11-01), Ramamurthy
"Running the Linear Lows: How to Make the Switch", Plastics Technology, pp. 65-71, Feb. 1981.

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