Although micronaire gives an indication of fiber maturity, it does not directly measure that property. Maturity and fineness related causes of barré include:
! Blending cotton from different growth areas or seed varieties.
! Immature fiber content such as white specks, neps, etc.
Yarn Formation/Supply
Even with proper fiber selection to reduce raw material effects on barré, techniques in the opening, cleaning, blending, and carding areas can have an impact on barré. These variations can occur at carding where different amounts of non-lint content removal from card to card can be a problem. Poor blending of fiber from opening through finisher drawing cannot be overlooked. In ring spinning, the running of different types of spindle tapes and the use of different cots or new and used cots mixed together on the same frame can create barré.
Faulty management in the spinning plant can result in the following yarn related causes of barré:
1. Yarn count variations.
2. Yarn twist variation.
3. Wrong yarn – size, color, blend level, twist direction.
4. Mixed yarn lots.
5. Mixed shipment dates of same dye lot.
6. Uneven waxing or oiling of yarn
7. Improper conditioning.
