Methods and systems for preparing flat-bottom thermoplastic sack

Details Methods and systems for preparing flat-bottom thermoplastic sack Methods and systems for preparing flat-bottom thermoplastic sack

1987-05-22

1989-03-28

Simmons, David

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156251, 156290, 1563084, 493195, 493232, B65D 2710

Patent

active

048161047

ABSTRACT:
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 preweakened 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.

REFERENCES:
patent: 3853664 (1974-12-01), LaFleur
patent: 3857329 (1974-12-01), Lehmacher
patent: 3966524 (1976-06-01), Lehmacher
patent: 4652253 (1987-05-01), Benoit

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