B - Operations – Transporting – 65 – B
Patent
B - Operations, Transporting
65
B
341/15.1
B65B 51/30 (2006.01) B29C 65/18 (2006.01) G05D 23/19 (2006.01) G05D 23/24 (2006.01) B65B 51/10 (2006.01)
Patent
CA 1318955
Heat Seal Temperature Control Abstract Method and circuitry is disclosed for controlling and stabilizing temperature of a resistance heat sealing element used in packaging operations. Temperature of the heat sealing element is measured by monitoring its resistance by means of a current sensing resistor placed in series with the heat sealing element. The resistivity of the heat sealing element is a function of temperature and current measurement, assuming substantially constant applied voltage, is an accurate measure of sealing element temperature. The circuitry reduces application of electric power to the sealing element in response to current in the sealing element dropping below a predetermined level. The circuit either continues application of electric power, or increases it, in response to the current being above the predetermined level. Circuitry is also provided for compensating for undesirable line voltage changes to maintain the heating element at a constant temperature. Means is provided for adjusting the predetermined temp- erature at which power cut off occurs. The circuit and sealing element can be operated in either a continuous manner of in a "one-shot" fashion which has been deter- mined as particularly useful for making seals which bear embossed indicia.
561641
Automated Packaging Systems Inc.
Ridout & Maybee Llp
LandOfFree
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