Apparatus for the formation of a clamped wave lid seal structure

Details Apparatus for the formation of a clamped wave lid seal structure Apparatus for the formation of a clamped wave lid seal structure

1991-04-15

1992-11-17

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Coacting shaping surfaces

425397, 425400, 425403, 425411, 425809, 156 69, 156581, 1565831, B29C 6518, B65D 7720

Patent

active

051642085

ABSTRACT:
An apparatus is disclosed that engages a lid to a container by the formation of interlocking waves of lid material and container material. The interlocking waves are geometrically aligned relative to the interior of the container so as to maximize the burst strength of the container, and also to minimize the force required to peel the lid from the container. An unheated clamp head of the apparatus is used to clamp the lid structure immediately adjacent a heated seal head used to form the interlocking wave structure about the inside rim of the container, so as to prevent any melted portions of the container or lid from flowing to or toward the outside rim of the container, so as to prevent the formation of similar interlocking waves about the outside rim of the container. The prevented formation of interlocking waves about the outside rim of the container yields a clamped-wave seal structure having reduced peel initiation forces and reduced average peel forces, without affecting the resistance of the container/lid system to high burst pressures typically encountered under retort conditions.

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