HEAT SEALING SYSTEMS AND METHODS, AND RELATED ARTICLES AND MATERIALS

摘要

The invention relates to an improved system for sealing a tube to form a bag. The bag may be formed from a tube of high strength packaging material by forming a heat seal in the end of the tube. A folding apparatus is provided, which includes upstream and downstream diverters, for folding the tube into a folded-over configuration. As part of forming the heat seal, one or more supplying apparatuses, which may be air outlets, are positioned for being in opposing face-to-face relation with, and for causing heat transfer with, at least one outer portion of the tube while a transportation system transports the tube to a nipping apparatus.