Method of making a coil a plastic foil or film of a thermoplasti

Details Method of making a coil a plastic foil or film of a thermoplasti Method of making a coil a plastic foil or film of a thermoplasti

1991-04-17

1992-11-10

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264 402, 26421112, 264564, 425141, B29C 4792, B29C 5528

Patent

active

051620898

ABSTRACT:
A method of making a coil of a plastic foil forms a flat web by extrusion through a wide slit nozzle or by film blowing and determines the thickness-error profile of the foil wound on a coil. Based upon monitoring the contour of the coil the inverse thickness-error profile is produced by control of the die gap and wound on the coil so that the coil is built-up alternatingly with the original thickness-error profile and the inverse thickness-error profile until completion of winding so that it has a sufficiently cylindrical coil contour.

REFERENCES:
patent: 4758390 (1988-07-01), Henze

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