Method of making a film having uniform thickness

Details Method of making a film having uniform thickness Method of making a film having uniform thickness

1989-10-23

1992-05-26

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

7386441, 83919, 264 106, 264564, B29C 4792, B29C 5528

Patent

active

051165546

ABSTRACT:
A method of providing uniform thickness of a synthetic resin film upon molding of the synthetic resin film with a die having a plurality of heating elements arranged adjacent a die lip of the die. The thickness of a film molded by the die is measured by cutting a sample of the molded film in a direction perpendicular to the direction of drawing of the film, and measuring the thickness of the sample in the direction of cutting with a film thickness measuring device. The measured values are then fed to an arithmetic unit. At the arithmetic unit, a corresponding relationship is calculated, based on the measured film thickness values, between a one-sided material portion of the film and the plurality of heating elements, and amounts of heat to be generated by the corresponding heating elements are individually controlled in accordance with the relationship.

REFERENCES:
patent: 3761553 (1973-09-01), Richardson
patent: 3883279 (1975-05-01), Heyer

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