PT80953A - A plastic bag a method of producing a bag and apparatus for executing this method - Google Patents

Abstract

An open ended plastic bag formed by heat sealing comprises a central and two outer longitudinal gusset fold edges bounding a first and a second gusset fold part, a bottom seal, and two first and two second fold part seals, at both sides of the bag. Additional seals extend parallel and near to the fold edges between central and outer fold edges. Each first, second and additional seal connects an outer bag foil layer with the opposite gusset fold part. Additional seals connected with second fold part seals extend to the free open end of the bag and additional seals connected with the first fold part seals extend to the transverse seal. As number of bags may form a web. Appts. for forming such bags comprises sealing means for forming a bottom seal, first and second fold part seals and additional seals. (First major country equivalent to PT--80953-A) (17pp) Method, and appts. are claimed for producing an improved heat-sealable gusset bag formed of plastic foil such that (a) at both sides of a bag two additional seals extend parallel to the fold edges in the region between the inner and outer fold edges, which additional seals are connected with the second fold part seals and extend from the second fold part seals towards the open end of the bag, each additional seal connected an outer foil layer of the bag with an opposite gusset fold.