초록 ▼

A bag structure of a thermoplastic film material comprising front and rear bag walls connected by side walls and having an open mouth top portion, said open mouth portion being characterized by having handles located at opposite end regions thereof, said handles being of two films as a result of bei

A bag structure of a thermoplastic film material comprising front and rear bag walls connected by side walls and having an open mouth top portion, said open mouth portion being characterized by having handles located at opposite end regions thereof, said handles being of two films as a result of being integral extensions of said front rear and gusseted side walls, said bag having a bottom wall planarly extensible so as to form a rectangle with at least no substantial excess film outside of the bulk volumetric capacity of said bottom region of said bag. This invention also provides a method and system for preparing flat bottom thermoplastic sacks comprising process steps and means for forming a tube of thermoplastic film, collapsing said tube while forming two oppositely disposed gussets therein, forming two pairs of diagonal sealed seams in the gussets, forming a transverse sealed seam across the tube along a line which includes the inboard ends of the diagonal seams and forming pre-weakened transverse lines closely adjacent to said transverse sealed seam or forming a severing line along this line, removing the four double triangular regions bounded by the diagonal seams, the transverse seams and the side edges of the tube and collecting the resulting structures either while still interconnected or by stacking the severed sacks. The final structure can have handles or it can be handleless.

대표청구항 ▼

A grocery bag structure of a thermoplastic film material comprising front and rear bag walls connected by gusset panels and having an open mouth top portion, said open mouth portion being characterized by having handles located at opposite regions thereof, said handles being of double films as a res

A grocery bag structure of a thermoplastic film material comprising front and rear bag walls connected by gusset panels and having an open mouth top portion, said open mouth portion being characterized by having handles located at opposite regions thereof, said handles being of double films as a result of being integral extensions of said front and rear walls and gusset panels, said bag having a bottom closure including a central two-film heat seal formed by sealing said front and rear bag walls and four diagonal heat seals outside of said central heat seal and formed by sealing said gusset panels to said front and rear bag walls with no substantial trapped gusset in said bag bottom closure.