Process for controlling the film thickness in a blown film extru

Details Process for controlling the film thickness in a blown film extru Process for controlling the film thickness in a blown film extru

1997-08-05

1999-09-14

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling heat transfer with molding material

264 401, 264 407, 425141, 425144, B29C 4792

Patent

active

059519266

ABSTRACT:
To control the film thickness in a blown film extrusion line with reversing or rotating takeoff of the film bubble, the thickness profile of the blown film bubble is measured over its circumference. Different temperatures can be applied to sections of the film bubble by a die ring divided into heating sections provided with control elements or by heating elements, forming a ring around the extruded film bubble and provided with control elements. In order to correctly assign the position of the measured thickness profile to the heating sections of the die ring or the heating elements, the extruded film bubble is provided with a mark in the region of the die ring or the heating elements and the rotation of this mark is measured by a measuring device at specified intervals from the die ring or the heating elements.

REFERENCES:
patent: 4246212 (1981-01-01), Upmeier, I
patent: 4339403 (1982-07-01), Upmeier, II
patent: 5178806 (1993-01-01), Predohl
patent: 5281375 (1994-01-01), Konermann
patent: 5676893 (1997-10-01), Cree

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