There are many reasons to know the warp direction of the fabric before you go for using it. To make it easy for determining warp and weft in a fabric piece observe the following characteristics of the fabric yarns.
Yarn Strength: Warp yarns are stronger compared to wefts
Stripe/check patterns: If fabric got coloured stripes then stripe direction shows warp (mostly). In checks, if you find one colour with odd numbers of threads, it is warp.
Yarn Strength: Warp yarns are stronger compared to wefts
Yarn appearance: Warp yarns are comparably finer than weft yarns and comparably higher twisted yarn.
Stripe/check patterns: If fabric got coloured stripes then stripe direction shows warp (mostly). In checks, if you find one colour with odd numbers of threads, it is warp.
Characteristics
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Warp
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Weft
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Selvage (If you got fabric with edges)
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Then it is easy to determine warps as parallel yarns with selvedge is warp.
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And yarns those are perpendicular to the selvedge are weft or filling yarn.
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Pull the yarn
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Comparably difficult to pull out warps from fabric.
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Comparably easier to extend from fabric
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Reed mark (View under strong light)
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1. Reed mark – you will find gaping after each pair of yarns.
2. Better regularity
3. Straighter
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1. No reed mark
2. More irregularity
3. Less straight
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Size (starch coating)
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Warps are coated with size materials
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No size
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