Apparatus and method for testing the thickness of the wall of a

Details Apparatus and method for testing the thickness of the wall of a Apparatus and method for testing the thickness of the wall of a

1977-03-21

1979-06-05

Corcoran, Robert J.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

264 401, 425141, G01R 3312

Patent

active

041575032

ABSTRACT:
An apparatus for testing the wall thickness of a moving tube of plastics or other electrically non-conducting material being produced by an extruder, comprises an electrically conductive measurement body arranged in the moving tube, a ferromagnetic holding member which is arranged in the tube within effective range of a holding magnet located outside the tube and which has a tie connection to the measurement body to locate the measurement body axially within the effective range of a measuring sensor located outside the tube. The holding member and the measurement body may be introduced into the tube through a channel in the extruder head, shot into the tube from a forward position, or inserted through an aperture cut in the tube wall.

REFERENCES:
patent: 2470338 (1949-05-01), Chilton
patent: 2525738 (1950-10-01), Tormey
patent: 2898550 (1959-08-01), Fisher
patent: 3702934 (1972-11-01), Jakobsen
patent: 3864625 (1975-02-01), Zumbach et al.

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