Method for preparing flat-bottom thermoplastic sack

Details Method for preparing flat-bottom thermoplastic sack Method for preparing flat-bottom thermoplastic sack

1984-08-20

1987-03-24

Spruill, R. L.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493237, 493238, 493239, B31B 2714, B31B 116

Patent

active

046522530

ABSTRACT:
Method and system for preparing a flat-bottom thermoplastic sack including forming a transverse sealed seam across the mid-section of a collapsed, gusseted tube and simultaneously or subsequently forming a preweakened transverse line closely next adjacent to the sealed seam; forming diagonal sealed seams of each 2 ply gusset fold so as to meet the ends of the transverse sealed seam and removing the four double-film triangular regions outside of the diagonal seams and separating said structures along the preweakend lines to form individual flat bottom sacks. The process also includes forming a handled version of the same sack.

REFERENCES:
patent: 3023679 (1962-03-01), Piazze
patent: 3537360 (1970-11-01), Farnam
patent: 3857329 (1974-12-01), Lehmacher et al.
patent: 3868891 (1975-03-01), Parish
patent: 3915077 (1975-10-01), Lafleur et al.

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