Method and apparatus for manufacturing sacks, and sacks obtained

Details Method and apparatus for manufacturing sacks, and sacks obtained Method and apparatus for manufacturing sacks, and sacks obtained

1990-06-13

1992-05-19

Terrell, William E.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493248, 493381, B31B 4900

Patent

active

051143933

ABSTRACT:
A method and apparatus for manufacturing sacks, made of polyethylene or other heat-sealable material, obtained by superposing two films or sheets which are unwound from respective rolls and are submitted to a pair of longitudinal welds to form a tube, and to transverse welds cuts. The edges of one of the sheets are formed with a re-entrant fold whereby the edges will overlap, with a portion of their outer faces, corresponding portions of the inner face of the other sheet. When only one of the sheets is folded at the edges, the welding of the overlapped end portions is effected by a single respective sealing bar acting on the outer face of the edges to be joined and having an opposite stationary contrasting member. In order to concentrate the welding heat only on the edge portions to be secured to each other, and to prevent said heat from reaching the sheet whose edges have been folded and acted upon by the stationary contrasting member, an insert strip of any suitable material, sufficiently flexible and of such a length as to extend over the entire length of the sealing bars, is inserted between the parts of the edge portions.

REFERENCES:
patent: 2440664 (1948-04-01), Irons
patent: 3155017 (1964-11-01), Haslacher
patent: 3473725 (1969-10-01), Wiehahn
patent: 3827341 (1974-08-01), Stage
patent: 4016026 (1977-04-01), Grevich
patent: 4871347 (1989-10-01), Brinkmeier
patent: 4915679 (1990-04-01), Gotou

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