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Lawson-Hemphill releases 'New Textile Tear Tester'

15
May '07
Lawson-Hemphill is releasing its "New Textile Tear Tester", 83-20 series. The latest addition in tearing testers, the new models offer a combination of technological integration and user comfort unique to this type of instrument.

The tear tester measures the force required to continue the tearing of an initial cut in textile materials. Models and weights are available to test material with a variety of strengths.

Also known as the Elmendorf test, the tearing test has been performed in the textile industry for more than half century in order to measure the mean internal resistance of textiles to the propagation of a deliberately initiated tear. It enables rapid determination of the dynamic resistance of materials designed to be subjected to strong shearing loads (e.g. suitcases, industrial fabrics) or liable to be damaged by sharp or heavy objects (e.g. seatbelts, outerwear, protective clothing).

Subsequently, the test was naturally adopted for all materials in the form of cloth, knitted fabrics, nylons,industrial fabrics, non-woven fabrics, etc.) for which the service requirements are required to sustain high tolerance.

The test is carried out on a specimen composed of one or more samples of standard dimensions, usually with a distance of 43mm (1.7”) remaining to be torn after initiating the tear. The energy of a pendulum of suitable weight is used to completely tear the specimen.

The difference in the angle from the vertical of the center of gravity of the pendulum between the downswing and the upswing is a measure of the energy absorbed in tearing the sample. This angular movement is measured with a digital encoder and is immediately converted to the mean tearing force for a single sheet by the microprocessor incorporated in the apparatus.


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