Test Methods- Miscellaneous

Abrasion resistance, or the resistance against wear and tear, is an important factor in some applications (e.g. anti-noise applications in cars). TEC uses the Martindale method of testing, which is a very suitable for woven, knitted and non-woven fabrics. In the test circular test pieces of the fabric are abraded on a standard abrading fabric under known pressure with a circular motion in the form of a ”Lissajous” figure.

 

The abrasion resistance is estimated by the number of cycles (turns) to the point of breakdown of the fabric (break in the threads) or by loss of mass of the test specimens. The material thickness can also be measured before and after test, indicating the wear.

 

Material thickness-

To measure the important factor thickness, TEC have an electronic thickness guage with a resolution of 1 μm, or 0,001 mm. The material to be measured is placed on the measuring table and the probe is lowered onto the material. The normal procedure is to measure the thickness at 10 different places on the material, and take the average of the readings as the result.

 

Other test that can be performed with the Tensile tester-

 

The Release force test is to determine the force needed to remove the

protective paper or -film from a single- or double sided tape. The test is carried out as a 180° peel test by removing the paper/film at an angle of 180° from the tape. The result is expressed in N/25 mm or N/50 mm.

 

Remember:

High release factor = easy to remove

Low release factor = more difficult to remove

 

Tensile strength/ Elongation-

The Tensile Strength and Elongation test shows the maximum load the tape can withstand, and the elongation at the maximum load. The method is useful for example when testing glass filament and wrapping tapes. The test is made by putting a 25 mm strip of the tape in the grips of the tensile tester and then pulling them apart at a constant speed until it breaks. The obtained result is a peak load, and is expressed as the tensile strength in N/25 mm and elongation as % of the initial length.

 

For measuring the force that is needed to unwind the roll

(especially for single sided tapes)

 

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