Vacuum indicating thermoplastic closure

Details Vacuum indicating thermoplastic closure Vacuum indicating thermoplastic closure

B - Operations, Transporting

65

D

206/1

B65D 41/04 (2006.01) B65D 79/00 (2006.01)

Patent

CA 1249240

ABSTRACT OF THE DISCLOSURE A vacuum indicating thermoplastic closure for a container for the packaging of a vacuum packed product, the top panel of the closure containing a circular inner portion which is connected to an outer annular portion by an inner annular portion with a circular hinge between the circular inner portion and the inner annular portion and another circular hinge between the inner annular portion and the outer annular portion to permit the circular inner portion to be moved relative to the outer annular portion from a first dimensionally stable position which indicates the presence of a vacuum in the associated container to a second dimensionally stable position which indicates the absence of a vacuum in the container without developing substantial tensile stresses in the top panel of the closure when the circular inner portion is in either such position. Also, a package consisting of a container, a vacuum packed product contained in the container and such a closure in sealing and closing engagement with the container.

491352

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