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Raw Yarn
Raw Yarn
raw yarn
Main Fibers and Their Proterties
Fiber | Polyester | Cotton | Nylon | Rayon |
Microscopic Appearance | Smooth, even, rod like, different cross-sectional shapes | Flat, twisted and ribbon-like | Very smooth and even | Striations seen in viscose and high strength rayon If delustred, scattered specks of pigment can be seen |
Length | Filament and staple | Staple fiber, length ranges from 1 to 5.5 cm | Filament and staple | Filament and Staple |
Color | White | Creamy white in natural form, unless treated | Off white | Transparent unless dyed |
Luster | Bright or dull | Medium, unless treated for luster | High natural luster that can be controlled | High |
Strength | Good to excellent | Fair | Exceptionally high | Fair to excellent Regular rayon: fair strength High tenacity types: good strength |
Elasticity | Fair to good | Low | Exceptionally high | Regular rayon: low High strength rayon: good |
Resilience | Excellent | Low | Very good | High wet strength rayon is better |
Moisture absorption | Less than 1% | Excellent | 3.8% | Higher than natural cellulose Fibers swell in water Weaker when wet |
Effects of sunlight | Good resistance | Oxidises, turning yellow and losing strength on long exposure | Good resistance | Generally resistant, loses strength after long exposure |
Cleanliness and washability | Prevents dirt from settling. Smooth surface allows stains to be easily washed away | Launders well and gives up dirt easily | Prevents dirt from settling. Smooth surface allows stains to be easily washed away | Prevents dirt from settling. Smooth surface allows stains to be easily washed away |
Effects of mildew | Absolutely resistant | Affected in a damp condition | No effect | Affected in a damp condition |