Process for producing reclosable bags

Details Process for producing reclosable bags Process for producing reclosable bags

1977-04-19

1979-02-13

Coan, James F.

93 33H, B31B 1900, B31B 190

Patent

active

041389328

ABSTRACT:
A method is provided for producing a reclosable plastic bag formed of heat sealable material. A web of the material is fed to a main folding station. A continuous length of a closure strip, capable of being bent manually and retaining its bent shape, is provided. The closure strip overlies the web adjacent one longitudinal side thereof but inwardly a sufficient distance to permit a portion of the web to be folded over the closure strip. The overfolded web portion is heat sealed to the web to form a pocket receiving the closure strip. Thereafter, the web is folded longitudinally at the folding station and the folded product is conveyed to a heat sealing and cutting station.
The resulting product comprises a reclosable plastic bag having a front wall, a back wall, a closed bottom and heat sealed side edges. The closure strip extends transverse the width of the bag substantially from one side of the bag to the other side. The back wall of the bag is folded over the closure strip and sealed to itself whereby the closure strip is intermediate two plies formed from the back wall.

REFERENCES:
patent: 3079844 (1963-03-01), Kugler
patent: 3688973 (1972-09-01), Lillkvist
patent: 3859895 (1975-01-01), White
patent: 4051994 (1977-10-01), Donk et al.

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