Gas venting means for plastic bags

Details Gas venting means for plastic bags Gas venting means for plastic bags

B - Operations, Transporting

65

D

220/2, 226/1.7

B65D 30/02 (2006.01)

Patent

CA 2001404

ABSTRACT OF THE DISCLOSURE A flexible walled bag of synthetic plastics film material which is essentially impervious to air. The bag has a pair of opposed walls forming a bag enclosure. An integrally formed vent is adjacent one of the margins of the bag. The vent has a relatively narrow airflow or venting passageway formed between opposed wall portions of the walls. There is an opening for placing the passageway in gas flow communication with the interior of the bag and a second opening spaced, for the first, for placing the passageway in gas flow communication with the atmosphere. Gases in the bag interior are able to escape to atmosphere through the second opening via the venting passageway but the ingress of air/oxygen from atmosphere is inhibited by virtue of the sealing effect created by the drawing together of the contiguous surfaces of the opposed wall portions when the bag interior pressure is sub-atmospheric.

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