Development and Evaluation of Integrity Assessment Tests for Polymeric Hermetic Seals
Abstract
An instrumented burst tester was developed that is capable of determining the precise internal pressure level at which a polytray package develops a small leak or explosively bursts. The total cost of fabricating a burst tester is approximately $5,000. Burst test results correlated well with peel strengths. It was found that non-defective seals from Vendors I and 3 performed very similarly. Defective polytray seals (entrapped matter, blisters, etc.) from Vendor I showed a large decrease in seal strength, while polytrays from Vendor 3 with short seal and entrapped matter defects showed no decrease in seal strength compared to non-defective seals. Finite element modeling showed that an internal pressure burst test adequately stresses the seal in all three possible crack propagation modes and another test to specifically test the seal in shear is not necessary. The non-contact ultrasonic inspection methods studied (airborne and laser-based) were either too slow or too insensitive to be feasible for 10O% online inspection of polytrays. The heat seal failure path always migrated to polyester/nylon bond in quad layer lid film before final failure of the seal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 19, 2006
- Accession Number
- ADA468015
Entities
People
- Kevin Kit