Continuous process for trash bag with inner bag

摘要

Trash bags may be formed to include first and second sidewalls joined along a first side edge, an opposite second side edge, and a closed bottom edge to form an outer bag. A second inner bag may be inserted within the first bag to form a “bag-in-a-bag” type configuration in which the inner bag is bonded to the outer bag along side seals by a continuous process. The bags may also be bonded together along the hem and the draw tape. When the side seals of the inner bag and the outer bag are sealed together by a continuous rather than a reciprocating process, the inventors have surprisingly found that such seals require carefully controlled process conditions to prevent inadequate seals.

主权项

1. A bag having an interior and an exterior and comprising:
an outer bag having a first sidewall made of a first flexible thermoplastic web material and a second sidewall of a sheet of the first flexible thermoplastic web material of the same sheet folded, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls joined along a first sealed side edge, an opposite second sealed side edge, and a closed bottom folded edge, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume; an inner bag separated from and within the interior volume of the outer bag and having a first sidewall made of the first flexible thermoplastic web material and a second sidewall of a sheet of the first flexible thermoplastic web material of the same sheet folded, overlaid and joined to the first sidewall to provide an interior volume, the first and second sidewalls of the inner bag joined along the first sealed side edge and the second sealed side edge of the outer bag, and a closed bottom folded edge of the inner bag, the first and second sidewalls un-joined along their respective top edges to define an opening opposite the bottom edge for accessing the interior volume; a first hem seal extending from the first sealed side edge to the second sealed side edge along the first sidewall, wherein along a length of the first hem seal, the first hem seal is broken or partially broken along one side of the first hem seal compared to an opposing side of the first hem seal; and a first continuous seal securing the outer bag first sealed side edge and the inner bag first sealed side edge together.