Inventors:
David Louis Frantz - Hockessin DE
Walter Ernest Lewis - Newark DE
Robert Vincent Jeral - Philadelphia PA
Frederick Henry Fiesser - Furlong PA
Assignee:
E. I. du Pont de Nemours and Company - Wilmington DE
International Classification:
B30B 1500
Abstract:
A heat seal wheel for use with a heat sealing apparatus associated with a continuous packaging machine, for forming a longitudinal seal in a flat sheet of flexible film. The heat seal wheel is characterized by a planar heater comprising a laminar resistive heating element sandwiched in between a top layer and a bottom layer of a thermally conductive and electrically insulative material. The top layer is bonded to the bottom surface a bearing disk, in contact with and supporting a rotating heat seal wheel for conductively heating the seal wheel and producing a heat seal in the seams of a moving web of plastic film.