Method of measuring thickness of extruded films

Details Method of measuring thickness of extruded films Method of measuring thickness of extruded films

1991-03-28

1992-08-04

Tentoni, Leo B.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

264564, 425141, 4253261, B29C 4792

Patent

active

051356899

ABSTRACT:
For measuring thickness of films of synthetic thermoplastic which have been solidified but not yet fully cooled after extrusion, a capacitive measuring head is moved into contact with the film and during a measuring cycle is moved over the surface of the film in the area in which the measurement is to be effected. The measuring head is disengaged from the film after each measuring cycle. To ensure that the measurement will not be affected by a temperature rise of the measuring head during a measuring cycle, the measuring head is moved into contact with the film before the measuring cycle begins and the measuring cycle is not initiated until a time has elapsed in which the measuring head has assumed a temperature which remains substantially constant throughout the measuring cycle.

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