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Helena Hjärtnäs
Forsknings- och utvecklingsingenjör
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Resistance to snagging according to ASTM D3939/D3939M-13 (2017)
Snagging is defined as loops of yarn/fibres on the surface of woven or knitted fabrics that occur when the material comes into contact with a sharp/prickly object.
When we use textiles in different areas, there is a risk that they will come in contact with sharp objects, which can cause loops to be pulled out of the construction.
Syfte
The method aims to evaluate the resistance of woven or knitted fabrics to snagging.
By testing a material's resistance to snagging, you get an indication of how well the material resists loops being pulled out of the material in contact with sharp/pricly objects.
For some applications, this can be a very important feature.
Materials made from filament yarns are more prone to looping than staple fiber materials, but woven materials with long floats can also be sensitive.
Metod
ASTM D3939/D3939M is an American method commonly referred to when testing snagging.
In this method, a Mace snagging apparatus is used, where the material is exposed to a metal ball with spikes.
Rectangular specimens are sewn together into tubes. The fabric tubes, right side out, are threaded onto a felt-covered cylinder.
The mace ball is placed against the fabric covered cylinder which rotates at the same time as the spiked ball jabs randomly at the fabric surface.
Visual assessment of the test specimens is performed after a certain number of turns.
The degree of "loops" that have appeared is assessed against a 1-5 range photo scale where 5 = no loops appeared.
The spikes of the ball only pull up loops from threads in one direction, so it is important to test both fabric directions.
Two specimens in each direction are tested.
Leverans
A report in Swedish or English with received results.
