Blown film thickness gauge

Details Blown film thickness gauge Blown film thickness gauge

1975-08-28

1976-10-26

Willis, Davis L.

Radiant energy

Coded record and readers; invisible radiant energy type

250273, 425 72R, 425141, G01N 2320

Patent

active

039885828

ABSTRACT:
Apparatus for measuring the thickness of the plastic film of a blown film machine, making the measurement adjacent the extruder die without contacting the film. A radiation source and detector spaced from one side of the plastic film and a metal member spaced from the other side, with the detector receiving fluorescent x-rays from the metal member produced by source photons and receiving back scattered source photons from the film and the metal member, with both the fluorescent x-rays and the scattered photons producing indications of thickness.

REFERENCES:
patent: 2711480 (1955-06-01), Friedman
patent: 3122784 (1964-03-01), Solliffe
patent: 3714309 (1973-01-01), Biglano
patent: 3767920 (1973-10-01), Kido et al.

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