Patent ID: 6986605
Filing Date: 2006-01-17
Classification: B65D

Abstract:
1. A multiwall bag comprising: an inner tube formed of a plastic material and having an open-end, a closed end positioned opposite the open end, an inner tube body extending between the open end and the closed end initially in an open position and adapted to receive filling material therethrough, and a plurality of spaced-apart inner vent openings formed in the inner tube body; a plastic strip overlying and adhering to a preselected region of the inner tube body and positioned to overlie the plurality of spaced-apart inner vent openings, the plastic strip extending substantially the entire longitudinal extent of tube body and including a plurality of spaced-apart outer vent openings to allow air to pass from within the inner tube body, through the plurality of space-apart inner vent openings, and through the plurality of spaced-apart outer vent opening, the combination of the plastic strip and the preselected region of the inner tube body defining a vent seal zone, the vent seal zone including a channel space positioned between an inner surface of the plastic strip and an outer surface of the inner tube body, the channel space also allowing air to flow therethrough and extending between the plurality of spaced-apart inner vent openings and the plurality of spaced-apart outer vent openings so that the plurality of spaced-apart inner vent opening and the plurality of spaced-apart outer vent opening are not aligned and thereby form a tortuous path to reduce the risk of insect infestation and to reduce product sifting when product is positioned in the bag; and an outer tube positioned to substantially surround outer surfaces of the inner tube, the outer tube having a closed end region positioned closely adjacent the closed end of the inner tube, an open end region positioned closely adjacent the open end of the inner tube, positioned initially in an open position, and adapted to receive filling material therethrough, and an outer tube body extending between the open end region and the closed end region and overlying the plastic strip, the outer tube being formed of a plurality of layers of naturally porous material to thereby allow air released from the vent seal zone to pass out of the bag through each of the plurality of layers of porous material.