Method and apparatus for effecting uniform film thickness

Details Method and apparatus for effecting uniform film thickness Method and apparatus for effecting uniform film thickness

1978-10-20

1980-06-24

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 403, 264 406, 264519, 264569, 425 72R, 425141, 4253261, B29F 308

Patent

active

042094755

ABSTRACT:
The uniformity of the gauge profile of thermoplastic sheet material is improved by means of a method comprising the detection of areas of non-uniform thickness in the sheet after drawing it away from the extrusion die and the redirection of a controlled portion of the cooling fluid by means of adjustable deflector blades which extend into the flowing stream of cooling fluid and alter the angle at which the cooling fluid contacts and quenches the molten extrudate, thereby allowing additional stretching of thick areas or earlier solidification of thin areas, as appropriate to the problem at hand.

REFERENCES:
patent: 2926384 (1960-03-01), Hertz et al.
patent: 2952874 (1960-09-01), Doyle
patent: 3125616 (1964-03-01), Cook et al.
patent: 3548042 (1970-12-01), Hinrichs
patent: 3835209 (1974-09-01), Karabedian

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