Tubular film process

Details Tubular film process Tubular film process

1982-11-22

1984-09-18

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Production of continuous or running length

264566, 264569, 425 72R, 4253261, B29F 308

Patent

active

044723431

ABSTRACT:
A tubular film process wherein molten resin is extruded from an extrusion die into a tubular resin, blown by an internal pressure, cooling air is discharged at least at a point between the vicinity of the extrusion die and the vicinity of a bubble expansion ending point in a direction of the extrusion of the resin and in a direction opposite to the extrusion of the resin to, thereby cool the tubular resin, and the tubular resin is continuously taken up upon being cooled and solidified. The cooling air has higher flow rate in the extrusion direction. The cooling air is discharged not only in the direction of the extrusion of the resin but also in the direction opposite to the extrusion of the resin, whereby hot air stream is prevented from accompanying the flow of the resin, thus enabling to effectively cool the tubular resin.

REFERENCES:
patent: 3867083 (1975-02-01), Herrington
patent: 3880974 (1975-04-01), Nohtomi et al.
patent: 3898028 (1975-08-01), Upmeier
patent: 3904342 (1975-09-01), Sato et al.
patent: 3950466 (1976-04-01), Hasler
patent: 4105380 (1978-08-01), Zimmermann
patent: 4118453 (1978-10-01), Herrington
patent: 4174932 (1979-11-01), Herrington
patent: 4341729 (1982-07-01), Hayashi et al.

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