Patent Number: 6,167,751

Title: Leak analysis

Abstract: A container with a flexible membrane sealed to a container end may be tested for leaks as the container moves along a conveyor. The conveyor carries the container through a first region in which a negative pressure differential is established between the first region and the interior of the container. The pressure differential can be established, for example, by cooling the first region with cold air. The conveyor also carries the container from the first region to a second region, in which a positive pressure differential is established between the second region and the interior of the container. The pressure differential in the second region can be established, for example, by heating the second region with hot air. In the second region, a sensor detects a transition of the membrane of the container between convex and concave orientations and produces a signal corresponding to the occurrence of the transition. A controller receives the signal from the sensor and determines whether the container has a leak based on the transition of the membrane.

Inventors: Fraim; Freeman W. (Lexington, MA), Di Bella; Francis A. (Roslindale, MA), Fine; David H. (Lincoln, MA), Beaty; John S. (Belmont, MA)

Assignee: Thermedics Detection, Inc.

International Classification: G01M 3/36 (20060101); G01M 3/02 (20060101); G01M 003/34 ()

Expiration Date: 01/02/2018