Testing of Carbon Fiber Yarn and Fabric

Twist increases the effect of cohesion in the yarn and the yarn strength will increase up to a point where any additional twist starts to break the fibers. Twisted yams can be doubled by plying two yarns, normally of opposite twist, to obtain a further increase in strength. If the yarns are the same twist, the product can be twist Kvely and when relaxed, any excessive twist will cause the doubled yam to snarl and curl up on itself. 

The other equipment is the WIRA digital twist tester, with an integral microprocessor and is totally automatic. 

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