Method of making a plastic foil and for winding the plastic foil

Details Method of making a plastic foil and for winding the plastic foil Method of making a plastic foil and for winding the plastic foil

1991-04-19

1993-02-02

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

26421112, 264564, 425141, B29C 4792, B29C 5528

Patent

active

051836068

ABSTRACT:
Blown or flat-extruded plastic film having systematic plus or minus errors in thickness along the width of the film have a thickness profile measured and the measured profile is fed to a computer which controls the extruded film or tube from which the film is blown so that the foil thickness will be increased between regions of plus-thickness error or decreased in sense between regions of minus-thickness errors, or both alternatingly, so that the resulting coil is cylindrical with significant precision and without the need to move the blowing head or tube flattening device.

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

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