Patent ID: 9499289
Filing Date: 2016-11-22
CPC Classification: B29C,B29K,B65B

Claim Text:
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 thermoplastic sheet(s) is fed through the heat 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.