Patent ID: 7341683

Claim:
A method of manufacturing a foamed-polyethylene blown-film bag comprising: providing a base polyethylene resin; providing a foaming agent; adding the foaming agent to the base polyethylene resin to form a foaming agent/base polyethylene resin mixture; processing the foaming agent/base polyethylene resin mixture by passing the foaming agent/base polyethylene resin mixture through an extruder that comprises at least a feed and a die and has varying temperature settings that gradually increase from the feed to the die to form a single-ply foamed polyethylene film having a density that is less than that of an unfoamed film formed by the same base polyethylene resin and a tensile strength that is not less than that of the unfoamed polyethylene film; and forming a bag from the single-ply foamed polyethylene film.