Exposure meter for use with indiction heat sealing of containers
US5432437A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1994 |
| Grant date | Jul 11, 1995 |
| Priority date | — |
| Expiry date | Jun 13, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C66/964
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A high frequency magnetic field exposure meter for use in an induction heat sealing operation for heat sealing metal foil elements in closures to containers to be closed by the closures. The meter has a magnetic field sensing coil, a rectifier to convert the a.c. output from the coil to a d.c. output, an integrating circuit to integrate the d.c. output over an exposure period to an h.f. magnetic field, and a display device to indicate the integrated exposure value generated by the 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 the reading provides a useful measure of the induction heating generated in an induction heat sealable closure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.