Manufacturing container or tube from paper; or other manufacturi – Container making – Pliable container
Patent
1985-04-24
1987-04-07
Schmidt, Frederick R.
Manufacturing container or tube from paper; or other manufacturi
Container making
Pliable container
493203, 493232, 493233, 493926, B31B 164
Patent
active
046557377
ABSTRACT:
A method for preparing flat bottom thermoplastic sacks comprising process steps 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 two pairs of diagonal preweakened lines parallel to said diagonal seals, 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 and parallel to said transverse sealed seam or forming a severing line along this line, removing the four double triangular regions bounded by the diagonal preweakened lines, the transverse preweakened lines and the side edges of the tube and collecting the resulting structures either while still interconnected or stacking the severed structures and then removing the triangular regions. The final structure can have handles or it can be handleless.
REFERENCES:
patent: 3119548 (1964-01-01), Cook et al.
patent: 3533331 (1970-10-01), Kugler
patent: 3748205 (1973-07-01), Adams
patent: 3853664 (1974-12-01), La Fleur
patent: 4476979 (1984-10-01), Reimann et al.
Gilman M. G.
McKillop A. J.
Mobil Oil Corporation
O'Sullivan, Sr. J. P.
Schmidt Frederick R.
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