Colgate Palmolive Company

Ramon Armando Mustafa

Robert J Mack

Patrick Andre Connan

The integrity of the dividing partitions walls of a multichamber container can be tested for voids after the filling of the containers. This is particularly useful for multichamber tube containers. These containers can have relatively thin tube divider partitioning walls which can have voids in the partitioning, in the attachment of the partitioning to the container walls, or in the case of a tube container the attachment of the dividing partition wall to the shoulder. The container chambers are filled with the substances which also are electrolytes and at the time of filling or just subsequent to filling, a potential difference is applied to each of chambers. Since the substance in each chamber is an electrolyte the potential difference extends throughout each side of the barrier. If there are one or more voids in dividing partition, there will be decrease in the potential difference. This can be detected on a meter or the potential difference can operate a switch that directs containers that have been found to have voids to a reject chute.

Method for package partitioning wall testing

A multichamber container must have certain characteristics in order to uniformly dispense the contents of each chamber from the container. The outer wall of the container and the inner divider web walls must have certain characteristics. The inner divider web walls must be highly flexible while the outer container wall must be less flexible. The Deflective Force for the outer wall must be greater than the Deflective Force for the web walls. In addition, to alleviate the problem of suckback of air into the container chambers, the outer wall should exhibit a specific Retention Index. This is a measure of the outer wall to remain deflected after the removal of the deflecting force. The inner divider web wall will have a lower Retention Index than the outer wall. By the proper selection of outer wall and web walls, there can be uniform dispensing from the dispenser. The Stiffness of the outer wall also should be less than the Stiffness for the inner web divider walls. This can be accomplished by the choice of films and the thickness of the outer wall film and the inner divider wall film.

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Hillsborough, NJ, United States of America

Ramon Armando Mustafa