Blown film process

Details Blown film process Blown film process

1976-08-02

1978-07-18

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 95, 264237, 425143, 4253261, B29F 308

Patent

active

041016149

ABSTRACT:
A blown film process wherein: the temperature of the film is continually monitored in a select control or target area that is remote from the film frost line; a control of "target temperature" is determined based empirically or otherwise on a given set of companion operating conditions; and a variable film cooling source or supply is regulated to establish the control temperature as an essentially constant or non-variable operating condition. The process is characterized by an essentially stable frost line position and to the extent movement of the frost line can be optically or otherwise observed or sensed, and an appropriate signal derived therefrom, the process can be alternately practiced based on monitoring the position of the frost line, defining a control or "target" frost line position, and regulating a film cooling source responsive to deviances or movement from the control position.

REFERENCES:
patent: 3092874 (1963-06-01), Fallwell
patent: 3125616 (1964-03-01), Cook et al.
Film Cooling & Frost Line-Polyethylene Film Extrusion-An Operating Manual - U.S.I.-1960-Nat. Dist. & Chem. Corp. pp. 27-30.
"Effect of Extrusion Variables on the Fundamental Properties of Tubular Film"-Plastics, 4-1961 -vol. 26 -Clegg - pp. 114-116.

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