Film edge sealing device

Abstract

A film edge sealing device is disclosed herein which has a groove defining a base. The base of the groove of the edge sealing device is oriented at a skewed angle with respect to a longitudinal direction of the conveyor of the heat sealing machine. Edges of a thermoplastic sheet or two stacked layers of thermoplastic sheets are introduced into the groove of the edge sealing device and placed in contact therewith to both heat and melt the edges of the thermoplastic sheet(s) to form a bead and join the edges thereof to form an edge bead seal.

1 . A heat sealing machine for forming an edge seal of a folded thermoplastic sheet or two stacked layers of thermoplastic sheets when wrapping a product, the machine comprising:
 a stand for holding a roll of folded thermoplastic sheet or the two stacked layers of thermoplastic sheets;   a heater mechanism;   an edge sealer block attached to the heater mechanism for heating the edge sealer block, the edge sealer block disposed adjacent to edges of the thermoplastic sheet(s), the edge sealer block having a groove along a length of the edge sealer block, a base of the groove oriented at a skew angle with respect to the edges of first and second layers of the thermoplastic sheet(s) so that the edges of the first and second layers of the thermoplastic sheet(s) approaches the base of the groove and contacts the base to melt and seal the first and second edges together to form the edge seal as the folded thermoplastic sheet(s) is fed through the edge sealing machine;   a set of pinch rollers or belts disposed adjacent to the edge sealer block for controlling forward travel of the edges of the first and second layers of the thermoplastic sheet(s) as the edges of the first and second layers of the thermoplastic sheet(s) are fed through the groove of the edge sealer block.   
     
     
         2 - 26 . (canceled)