G - Physics – 05 – D
Patent
G - Physics
05
D
G05D 23/19 (2006.01) B29C 65/18 (2006.01) B29C 65/20 (2006.01) G05D 23/20 (2006.01)
Patent
CA 2136093
2136093 9324302 PCTABS00028 Apparatus for controlling heating of heat sealing dies (12) relative to a target temperature has one or more electrical resistance heating elements (10) switched between "on" and "off" states for getting electrical power, according to frequency and durations of control signals. A first signal (from 42) proportional to said target temperature and a second signal (from 18) proportional to actual temperature to be controlled are compared (36, 38) to gauge prevailing temperature difference. Means (28, 30; 24, 26) responsive to comparison results is operative for varying said durations and said frequency of the control signals, both according to said temperature difference and to reduce same.
Ceetak Developments Limited
Gowling Lafleur Henderson Llp
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