Fibre Blending in the Blowroom
category
Blending of fibre material is an essential preliminary in yarn production. The start of the process is one of the most important stages because individual components are still separately available and can be metered exactly. In practice, fibre is taken from 20–48 bales of cotton simultaneously (6–12 for man-made fibres). Modern automatic bale openers extract sequentially, not simultaneously, requiring separate blending machines downstream.
Role
Uniform blending is critical for consistent yarn quality. A well-assembled bale layout with even extraction from all bales, combined with intensive downstream blending, ensures that variations between bale origins are minimised throughout the production run.
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Subtopics
- Bale Layout and Bale Management Bale layouts comprise up to 130 bales from 4–6 different sources per blend. Bales can be chosen so t…
- Mixing Batteries and Conventional Blending The mixing battery uses 2–5 mixing bale openers operating together, with opened material from all op…
- Multi-Chamber Blending Machines The Trützschler MCM/MPM Multiple Mixer has 6–8 adjacent chute chambers filled successively with mate…
- Metering and Precision Blending The Rieter A 81 UNIblend uses separate chutes for different material types, each with an independent…
- Sandwich Blending Principle In sandwich blending, layers of different raw material components are stacked vertically in a blendi…
- Acclimatization of Raw Material Blowroom air temperature should be above 23°C with relative humidity of 45–50%. Damp air causes poor…
- Addition of Waste to Raw Material Blends Clean waste (broken ends of sliver and lap: 100% good fibre; filter waste: 95–98%; comber waste: 95–…
- Classification of Feed Materials Fibre materials in short-staple spinning are divided into cotton (various origins), man-made fibres …
- Expected Waste Quantities by Machine and Material Typical waste percentages in industrialised countries: blowroom 3–6% (varying by staple length), car…
- Continuous vs Batch Bale Processing Standard bale openers process material charge by charge (one bale layout at a time). The Trützschler…