Significance and Use In form-fill operations, sealed areas of
packages are frequently subject to disruptive forces while still
hot. If the hot seals have inadequate resistance to these
forces, breakage can occur during the packaging process. These
test methods measure hot seal strength and can be used to
characterize and rank materials in their ability to perform in
commercial applications where this quality is critical. 1.1
These two test methods cover laboratory measurement of the
strength of heatseals formed between thermoplastic surfaces of
flexible webs, immediately after a seal has been made and before
it cools to ambient temperature (hot tack strength). 1.2 These
test methods are restricted to instrumented hot tack testing,
requiring a testing machine that automatically heatseals a
specimen and immediately determines strength of the hot seal at
a precisely measured time after conclusion of the sealing cycle.
An additional prerequisite is that the operator shall have no
influence on the test after the s