Patent ID: 7617950

Claim:
A method of controlling the flow of a substance from at least one chamber of a multiple chamber tube container having at least two chambers comprising: providing a shoulder and a dispensing nozzle at one end and a crimp seal at another end of said tube container, said nozzle having a circular horizontal cross-section and divided into at least two separate channels, said shoulder receiving the substance from the at least one chamber, said dispensing nozzle having an input end having a first cross-sectional area above the shoulder for receiving the substance from the shoulder and an exit dispensing end having a second cross-sectional area, the second cross-sectional area being less than the first cross-sectional area, at least one channel in said dispensing nozzle between the input end and the exit dispensing end in communication with each chamber of the at least two chambers; providing at least two substances to be dispensed, one of said at least two substances provided in each chamber; determining the flow rate characteristics for each substance in said at least one channel; and installing a flow modifying unit in the nozzle in a channel of said dispensing nozzle of one substance to reduce the flow of said one substance from the tube container and to limit suck-back of said one substance after a dispensing, wherein the flow modifying unit is at a location in the nozzle intermediate the input end and the exit dispensing end, the location in the nozzle having a cross-sectional area that is equal to the second cross-sectional area.