Method and apparatus for measuring the wall thickness in a plast

Details Method and apparatus for measuring the wall thickness in a plast Method and apparatus for measuring the wall thickness in a plast

1979-09-06

1981-12-08

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250223B, 250341, G01J 100

Patent

active

043049958

ABSTRACT:
A method and an apparatus for measuring the wall thickness of a plastic article, particularly of a hollow rotation-symmetrical plastic article. According to the method, the wall of the plastic article is subjected to infra-red radiation and the intensity of, e.g., the continuously transmitted radiation is measured at preselected points, said intensity being a function of the wall thickness to be measured. At the same time, on one hand, the plastic article and, on the other hand, a radiation source and/or a radiation detector are set in an axial and rotational movement in relation to each other.

REFERENCES:
patent: 2755703 (1956-07-01), Politsch et al.
patent: 3328593 (1967-06-01), Johnson et al.
patent: 4017194 (1977-04-01), Conroy et al.

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