Sack, and a method and apparatus for filling, removing air from,

Details Sack, and a method and apparatus for filling, removing air from, Sack, and a method and apparatus for filling, removing air from,

1984-05-02

1986-04-08

Culver, Horace M.

Flexible bags

With venting or ventilation means

Fluid circulates between bag plies

383103, 53433, 53434, 53512, B65B 3104

Patent

active

045817642

ABSTRACT:
A tube sack has a fill chamber and a flag at one end thereof, the flag having a sealing seam at the outer end thereof and a labyrinth seam which is adjacent the fill chamber and which is arranged to provide small passages through which air can flow from the fill chamber to a ventilation chamber located between the sealing and labyrinth seams. A vent opening is provided in the form of a perforation through a wall of the flag or an interruption in the seal seam, and is sealed by a bridging seam which surrounds it or by a seal piece which is glued over it. In a method and apparatus for making the sack, a tube is formed and sealed at one end, is then filled, and the flag, sealing seam and labyrinth seam are then made in the other end along with, where appropriate, a perforation for the vent opening. The sack is placed on a horizontal conveyor apparatus and passes through a mechanism which presses air out of the fill chamber through the vent opening, and the vent opening is then sealed by the bridging seam or by the seal piece.

REFERENCES:
patent: 2983087 (1961-05-01), Schofield
patent: 3016284 (1962-01-01), Trexler
patent: 3382642 (1968-05-01), Shaw
patent: 3469364 (1969-09-01), Bischoff
patent: 3958391 (1976-05-01), Kujubu
patent: 4112124 (1978-09-01), Jarvis
patent: 4251976 (1981-02-01), Zanni

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