Importance

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Abstract

A machine and process for making container lid assemblies with a flexible membrane with a pull tab adhesively secured to a rigid ring so that when desired the membrane can be peeled off and removed from the ring to provide access to the container. Individual membranes are cut and separated from a web by rotating dies and individually transferred, accelerated and applied by a rotating anvil cylinder and transfer roller to individual rings which have been preheated sufficiently to activate an adhesive to adhere the membrane about its periphery to the ring. The rings are heated by an induction coil and a downstacker deposits heated rings on a moving conveyor belt which conveys them under the transfer roller where they are urged into firm engagement with a membrane by a resilient applicator pad on the transfer roller and an underlying support roller. If a ring has not been heated sufficiently to insure proper adhesion of its associated membrane, the membrane is released and removed from the transfer roller to avoid producing lid assemblies with a defective seal. Downstream from the transfer roller, lid assemblies are inspected and defective lid assemblies are rejected. Lid assemblies are cooled relatively quickly by fans and then they are ready by packaging, shipment and use.

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First Claim