‘Folding Endurance’ of a stripe of paper gives an assess of the resistance presented
by the stripe to the application of outer force in the shape of various and repetitive
folds, prior to breaking. This test determines the appropriateness of a paper kind
to be used in situations where it will be subjected to frequent folding, winding,
and creasing. Hence this test finds application meant for such papers which bear
such forces or handled very regularly, similar to currency papers, packaging
papers, maps, pamphlets, cartons, cover papers, bond papers, ledgers etc.
Currency paper has the maximum folding endurance. The factors that influence
this assets of paper comprise fiber span, power of fiber, wetness content, make
use of fillers etc. For studying the ageing characteristics of a paper the standards
of fold endurance prior to and subsequent to accelerated environmental ageing
are made use of. Quantitatively it is calculated as the amount of double folds,
coupled with a particular load that a stripe of paper, with an exacting measurement,
can endure before it breaks. There are four dissimilar mechanism types or
designs which are used to take out this assessment and the assessment outcome shaped
by them diverge because of variations in the stripe loading applied, stripe
folding slant, and the rate of folding. The tests using the diverse instruments
are carried out according to split standards, for e.g. the Schopper type tester
is carried out as per TAPPI T423, and the MIT type tester is done as per TAPPI
T511.
Goodrich Agrochem’s Paper strength additives range helps to increase the double fold property of paper.
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