Reclosable pouches or bags having front panel containment zipper

Abstract

Flexible containers that are hermetically resealable after initial opening. The resealable containers are of a type that comprises front and rear panels forming an interior volume that is accessible by means of a resealable plastic zipper attached to the front panel only. Each zipper comprises a pair of extruded plastic zipper strips. The zipper strips are flattened and joined to each other at the ends and are further joined to each other, without substantial deformation of the closure profiles, in respective transition areas substantially contiguous with the flattened ends. These transition areas of zipper strip joinder assist in providing a leakproof transition from the openable section of the zipper to where the closure profiles have been fused and flattened (i.e., crushed).

Description

BACKGROUND OF THE INVENTION [0001] This invention generally relates to flexible containers, such as pouches, bags or other packages, having a reclosable plastic zipper. In particular, the invention relates to reclosable bags, pouches or other packages for containing vacuum, pressure or liquid. [0002] To ensure hermeticity or airtightness, packagers have typically sealed their flexible containers to an extent that they are not reclosable after the seal is broken. Many flexible containers that were reclosable typically did not retain the desired vacuum, pressure or liquid containment feature that existed prior to the container being opened for the first time. [0003] In many different applications, it is desirable to provide a reclosable container that, under normal or expected conditions of usage, will not leak fluid when the zipper is reclosed. Such a container should maintain a leakproof condition even when there is a large differential in pressure between the interior and exterior ...

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