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Wednesday, June 29, 2016

To Tear or not to Tear

Tearing resistance of paper and paperboard has long been one of the standard physical tests performed by paper companies. However, as more paper companies move to automated laboratory and online testing, tear seems to be one property that is not being directly measured nearly as much. Most online and automated systems will correlate a series of tests to a tear value or estimate tear. There are some automated laboratory systems that do measure tear, however, they are not done the same as the traditional tearing resistance test.

The internal tearing resistance is the work done to tear paper through a fixed distance after the tear has been started. Tearing strength has long been widely used as a mill control test because it reflects the general nature of the fibers present in the paper as well as the degree of beating to which they have been subjected.

Tearing strength has particular significance in the evaluation of paper and paperboard which is subjected to tearing strains during converting and end use. This includes paper used for bags, wrapping, tissue, books, and magazines.

Do you see less reliance on tear testing and measurements?

If so, what other tests are used to predict the same action that tear has traditionally been used for?

Is there a good way to estimate tear with other tests?

Reference: "Properties of Paper: An Introduction" - Scott, W.E & Trosset, S. p. 61 (1989)

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