Package making – Methods – With contents treating
Patent
1994-06-30
1995-09-26
Johnson, Linda
Package making
Methods
With contents treating
53510, B65B 3104
Patent
active
054525632
ABSTRACT:
A method for substituting inert gas for ambient air in the headspace of a container prior to closing of an opening of the container. The container is displaced along a straight path in a predetermined horizontal direction from a first position to a second position, e.g., by a conveyor. A stream of inert gas is injected generally downward from an outlet toward the headspace via an inverted recess as the container travels from the first position to the second position along the path. The inverted recess has a peripheral edge which is a closed contour lying in a horizontal plane. The exit velocity of the inert gas at the outlet and the dimensions of the outlet are such that the flow of inert gas from the outlet into the headspace is generally laminar. A portion of the inert gas enters the headspace to displace gases inside the headspace until less than 1% oxygen remains in the headspace. The gas which has been displaced out of the headspace is then channeled to flow in the predetermined horizontal direction through a volume located at an elevation which is higher than the elevation of the headspace. The channeled gas is thereafter redirected in a generally downward direction.
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Evans Donald
Harbison James C.
Lomax Edwin D.
Marano Gerald A.
International Paper Company
Johnson Linda
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