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textiles atom orientation fibre weight calculation ppi epi weft count warp count yarn count picks per inch ends per inch cotton fabric gsm cutter textile testing fabric construction woven fabric woven gsm weft warp fabric butex cad consumption marker cutting sewing garments efficiency business pgd iba du dhaka university physical properties of textile side chain of atoms pendanting groups spinnable glucose cellulose cotton fibre degree of polymerization polymer monomer molecule square