verb
1.(of a fibre) split up into fibrils.
‘Following installation of the fabric, when high pressure showers are in use, the yarns tend to fibrillate, small pieces of yarn peeling away and often ending up in the cross-over point of the weave.’
‘During tufting, however, the profiled weft yarn fibrillates in an uncontrolled manner which for deniers finer than about 500 dtex can result in such low strength that the resulting carpet tears during the finishing process.’
2.(of a muscle, especially in the heart) make a quivering movement due to uncoordinated contraction of the individual fibrils.
‘the atria ceased to fibrillate when the temperature was reduced’
‘Anticoagulation is required afterwards because the atria continue to fibrillate and the risk of systemic embolism persists.’
3.Break (a fibre) into fibrils.
‘Another goal of the treatment process is also to preferably fibrillate the yarn and/or filaments of the fabric.’
‘The thicker the ribbon yarn the more difficult the yarn is to fibrillate and the harder it is for tufting needles to penetrate the unfibrillated portions.’
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