Hot air hem sealer heat exchanger

Details Hot air hem sealer heat exchanger Hot air hem sealer heat exchanger

1988-04-15

1989-07-25

Schmidt, Frederick R.

Manufacturing container or tube from paper; or other manufacturi

Control means energized in response to activator stimulated...

Responsive to temperature

493191, 493193, 493225, 493928, 156497, B31B 2364, B31B 190

Patent

active

048509442

ABSTRACT:
Apparatus for heat sealing the respective layers of film in a pair of hems in a moving web of film in the manufacture of draw tape bags. A pair of hot air hem sealer units is provided each of the units including a hot air hem sealer heat exchanger having a plurality of nozzles which direct hot air against a continuously moving film. The nozzles are in line with film movement and the film is backed up by a metal plate positioned between the hems. Following the heating phase cool compressed air is directed against the film in the heated area to cool the film prior to contact with the hem seal on the other side of the bag. The heat exchanger includes a plurality of circumferential grooves which deliver hot air to the nozzles. A thermocouple controls the temperature of the hot air.

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patent: 4631388 (1986-12-01), Manning
patent: 4714454 (1987-12-01), Herrington
patent: 4714455 (1987-12-01), Herrington

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