Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1992-11-24
1994-07-26
Raevis, Robert
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
G01N 1904
Patent
active
053318587
ABSTRACT:
A procedure and apparatus for testing the hot tack properties of heat sealable flexible packaging materials. A portion of a test strip of heat sealable material is lapped and a segment of this portion heat sealed together. Upon completion of the heat seal the unsealed ends of the test strip are pulled apart at a prescribed constant rate to gradually delaminate the heat seal while the heat seal is cooled at a prescribed rate. Force required to delaminate the seal is continuously recorded as a function of time as the heat seal cools, thus providing data on seal strength for a full range of temperatures of the heat seal as it cools over time. In the apparatus a threading bar intercepts the strip intermediate its ends and pulls a portion through the opening between opposed dies of a heat sealer and in doing so laps the portion of the strip pulled through the opening. The test strip is then liberated from the threading bar during or following heat sealing of the lapped portion, as by cutting the strip at the threader.
REFERENCES:
patent: 2377869 (1945-06-01), Elliott
patent: 2834205 (1958-05-01), Pickup
patent: 3580065 (1971-05-01), Strittmater
patent: 3850033 (1974-11-01), Schmitt
Topwave DTC Hot Track Tester Brochure obtained from display booth at a trade show prior to Nov. 1991 in U.S. Date and place of publication unknown.
DTC Hot Tack Tester Operation Instructions provided to purchaser of a DTC Hot Tack Tester (duPont) in U.S. prior to Nov. 1991. Date and place of publication unknown.
H. W. Theller Inc.
Horton Corwin R.
Raevis Robert
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