Resilience testing
AssigneeA.P.D. Snack Foods Pty Limited
InventorIan Fitzpatrick
Life of this patent
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Abstract
This invention concerns a resilience testing gauge and a resilience testing system, which includes the gauge, suitable for testing the seal quality of partly inflated bags. This invention also concerns a method of testing the seal quality of partly inflated bags using the resilience testing gauge. The gauge employs a first (2) and a second (3) beam cantilevered from a rigid block (4). In use the rigid block (4) is vibrated and one of the beams (3) is brought into contact with the article under test. The phase responses of the two beams (2 and 3) then provide information from which the test results can be determined.
Claims13
A resilience testing gauge comprising:
- first and second beams cantilevered from a rigid block;
- means for exciting the rigid block at a selected constant frequency such that the beams are caused to vibrate;
- detecting means for detecting the dynamic phase response of each beam when the first beam is allowed to vibrate freely and a second beam is brought into contact with an article to be tested;
- and
- output means for outputting an indication of the relative dynamic phase response of the beams with respect to each other.
A resilience tester suitable for testing the seal quality of partly inflated bags including a resilience testing gauge comprising:
- first and second beams cantilevered from a rigid block;
- means for exciting the rigid block at a selected constant frequencY such that the beams are caused to vibrate;
- detecting means for detecting the dynamic phase response of each beam when the first beam is allowed to vibrate freely and a second beam is brought into contact with an article to be tested;
- and
- output means for outPutting an indication of the relative dynamic phase response of the beams with respect to each other.
A resilience testing method suitable for testing the seal quality of partly inflated bags comprising the steps of:
- compressing a bag by an amount not sufficient to damage the seal or contents;
- feeding the bag on a conveyor past a second beam of a gauge comprising a first and second beam cantilevered from a rigid block;
- exciting the rigid block at a selected constant frequency such that the beams are caused to vibrate;
- detecting the dynamic phase response of each beam;
- integrating the responses over the time period the bag is in contact with said second beam, and integrating the responses over the time during this period in which the first and second beams vibrate out of phase;
- comparing the resulting ratio with a pre-set level;
- and
- outputting a result of the comparison.
Dependencies are inferred from the claim text.