G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/00 (2006.01) B29C 65/02 (2006.01) G01R 33/028 (2006.01)
Patent
CA 2120938
2120938 9307504 PCTABS00021 A high frequency magnetic field exposure meter for use in an induction heat sealing operation for heat sealing the metal foil elements in closures (1) to the container (15) to be closed by said closure (1). The meter comprises a magnetic field sensing coil (16); a rectifier (17) to convert the a.c. output from said coil (16) to a d.c. output; an integrating circuit (18) to integrate said d.c. output over an exposure period to an h.f. magnetic field; a display device (19) to indicate the integrated exposure value generated by the said integrating circuit. During operation the meter generates a quantitative reading indicating exposure to the h.f. magnetic flux as an integral of the magnetic flux, which generates the induction heating currents, over the exposure period during the induction heat sealing operation and said reading provides a useful measure of the induction heating generated in an induction heat sealable closure.
Fetherstonhaugh & Co.
Koninklijke Emballage Industrie Van Leer N.v.
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