초록 ▼

The present invention relates to thermoplastic bag constructions capable of standing in an open and erect position without the extraneous support means normally employed with such bags. The bag is characterized by having a bottom gusset and heat sealed side seams which form the lateral bag edges. Th

The present invention relates to thermoplastic bag constructions capable of standing in an open and erect position without the extraneous support means normally employed with such bags. The bag is characterized by having a bottom gusset and heat sealed side seams which form the lateral bag edges. The individual walls of the bottom gusset are sealed to the adjacent bag walls utilizing a plurality of spaced apart vertical heat seals which are arranged in a predetermined pattern whereby when the bag is open the bag bottom assumes an elliptical configuration and is self-supporting as a result of the stiffening effect of the vertical heat seals.

대표청구항 ▼

A bag structure of thin thermoplastic material adapted to remain in an upright position when opened comprising front and rear bag walls, an open mouth at the upper edge of said walls, heat seal seams joining said bag walls together along longitudinal edges, and at least one bottom gusset fold formin

A bag structure of thin thermoplastic material adapted to remain in an upright position when opened comprising front and rear bag walls, an open mouth at the upper edge of said walls, heat seal seams joining said bag walls together along longitudinal edges, and at least one bottom gusset fold forming a bag bottom wall said gusset fold having front and rear gusset walls which are sealed to the adjacent bag walls utilizing a plurality of spaced apart vertical heat seals which extend upwardly from bottom edges of the bag walls and respective gusset walls in a predetermined pattern wherein said vertical seals are arranged in order of descending height from each of said longitudinal bag wall edges toward the central portion of said gusset fold, whereby when the bag is open the bag is self supporting as a result of the stiffening effect of the vertical heat seals.