Indicator for Proving Tightness of Seals in a Packaging Consisting of at Least Partially Light Permeable Thermoplastic Film

摘要

A seal testing system provides an indicator of the tightness of seals in packaging of the seal testing system includes at least partially light permeable thermoplastic film providing two flexible layers that are impermeable for liquid and that are circumferentially sealed to define chambers that store a seal testing fluid and that are interconnected via a narrowed intermediate passage. At least section of a seal between the film layers is weakened to allow release of the seal testing fluid when pressure is introduced in the chambers.

主权项

1. A seal testing system, comprising:
a pair of liquid-impermeable flexible film layers;a circumferential seal that is provided between the pair of film layer and that causes the pair of film layers to define a first chamber connected to a second chamber by a narrowed passage;
at least one section of the circumferential seal between the pair of film layers that is located adjacent the second chamber and that is weakened relative to the remainder of the circumferential seal to provide a weakened seal section; and a seal testing liquid included in at least one of the first chamber and the second chamber, wherein the weakened seal section provides for release of the seal testing liquid from the at least one of the first chamber and the second chamber in response to a pressure introduced in the second chamber.