ASTM F 1921 Standard Test Methods for Hot Seal Strength (Hot Tack) of Thermoplastic Polymers and Blends Comprising the Sealing Surfaces of Flexible Webs
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ASTM F 1921 Document Information:
Title
Standard Test Methods for Hot Seal Strength (Hot Tack) of Thermoplastic Polymers and Blends Comprising the Sealing Surfaces of Flexible Webs
ASTM International
Publication Date:
Oct 10, 1998
Scope:
These 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.
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 sealing
sequence has begun. These test
methods do not cover non-instrumented manual procedures employing
springs, levers, pulleys and
weights, where test results can be influenced by operator technique.
Two variations of the instrumented hot tack test are described in
these test methods, differing
primarily in two respects: (a) rate of grip separation during testing
of the sealed specimen, and
(b) whether the testing machine generates the cooling curve of the
material under test, or instead
makes a measurement of the maximum force observed following a set
delay time. Both test methods may
be used to test all materials within the scope of these test methods
and within the range and
capacity of the machine employed. They are described in Section 4.
SI units are preferred and shall be used in referee decisions.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use. The
operator of the equipment is to be aware of pinch points as the seal
jaws come together to make a
seal, hot surfaces of the jaws, and sharp instruments used to cut
specimens. It is recommended that
the operator review safety precautions from the equipment supplier.
Keywords:
- heatseal
- heatsealability
- hot tack
- seal strength
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