The numbering of a yarn serves to designate its fineness (thickness) For natural silk, filament yarns and spun fibres, the fineness is expressed in decitex (dtex = grammes/10,000 m); the fineness of spun fibre warns made of synthetic and natural fibres, on the other hand, is often still stated in metric numbers In metric numbering, the higher the yarn number is, the finer the yarn is In accordance with the law on standard sizes, the yarn fineness is stated in tex Tex is the weight of 1,000 m yarn Tex is one tenth dtex
The number assigned each print It comprises two figures separated by a stroke The first indicates the progressive number of the print in the print-run while the second indicates the extent of that print-run