Draw tape bag forming method and apparatus

Details Draw tape bag forming method and apparatus Draw tape bag forming method and apparatus

1988-02-22

1989-11-21

Schmidt, Frederick R.

Manufacturing container or tube from paper; or other manufacturi

Container making

Pliable container

493192, 493197, 493202, 493928, B31B 190

Patent

active

048819336

ABSTRACT:
A draw tape bag is formed from a plastic web. An edge folding unit, a notching unit, a tape inserting unit, a heat sealing unit and a web folding unit form a compact continuous line in a rectangular path. The hem folder includes a L-shaped plate within the hem to receive a draw tape. The plate is pivotally mounted the tape within the hem. A wheel is rotatably and pivotally mounted for pulling the hem onto the plate. A single strap on a roll has a width equal to both tapes. The roll is driven and the strap passes over a knife to sever the strap from the tapes. A tension control roll is coupled to moving the strap and controls the strap feed to hold a constant tape tension. A folding board includes spaced edge channels in a V-shape for folding the flat web. An air layer is interposed between the web and the folding channels to provide a low friction movement. A bag making machine includes a presealer to form tape edge seals, a cooler for cooling the tape hems and an edge sealer and cutting unit to form the side edges of the bag.

REFERENCES:
patent: 3058402 (1962-10-01), Kugler
patent: 3148598 (1964-09-01), Davis
patent: 3512456 (1970-05-01), Meyer
patent: 3772968 (1973-11-01), Ruda
patent: 4597750 (1986-07-01), Boyd et al.
patent: 4624654 (1986-11-01), Boyd et al.
patent: 4664649 (1987-05-01), Johnson et al.
patent: 4714455 (1987-12-01), Herrington

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