Preheater for heat-sealing system for plastic containers

Details Preheater for heat-sealing system for plastic containers Preheater for heat-sealing system for plastic containers

1988-07-25

1989-08-15

Yuen, Henry C.

Heating

Heat applicator having structure for mounting it on or...

432226, 432 59, F24J 300

Patent

active

048569895

ABSTRACT:
A preheater assembly for softening a selected portion of plastic stock material prior to severing and edge sealing is disclosed. The preheater assembly includes a pair of opposed preheaters, each having a heater tip connected to a source of heated air. The air flows through the tip to maintain it at a preselected temperature. The preheaters are mounted on opposite sides of the stock material for motion toward the material to engage it on opposite sides to heat and soften it, and away from the material to release it. Clamp elements engage the stock material during the heating and softening process.

REFERENCES:
patent: 2435923 (1948-02-01), Hess
patent: 3846209 (1974-11-01), Howard
patent: 3847711 (1974-11-01), Howard
patent: 3986914 (1976-10-01), Howard
patent: 3988184 (1976-10-01), Howard
patent: 4515562 (1985-05-01), Williams
patent: 4549866 (1985-10-01), Granville
patent: 4580972 (1986-04-01), Hsiung
patent: 4673122 (1987-06-01), Dubey

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