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 June 19, 2013
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# Spinning Formulas

Formulas used for yarn spinning production including various yarn numbering system conversions

 Common Formulas
 Grams per Meter 0.5905 / Ne Grams per Yard 0.54 / Ne Tex den x .11 = 1000/Nm = Mic/25.4 Ne Nm/1.693 DRAFT (feed weight in g/m) / (delivery weight in g/m) DRAFT Tex (feed)/Tex(delivery) DRAFT delivery roll surface speed/feed roll surface speed No. of hanks delivered by m/c (Length delivered in m/min)/1.605grams per meter = 0.5905/Ne

 Carding
 Production in kgs / hr ( L x 1.0936 x 60 x effy ) / (hank (Ne) x 36 x 840 x 2.2045) L - delivery speed in m/min effy- efficiency Ne - English count ( number of 840 yards in one pound) 840 - constant 2.2045- to convert from lbs to kilograms Production in kgs / hr (L x Ktex x 60 x effy) / ( 1000 ) L - delivery speed in m/min Ktex- sliver count in Ktex (kilotex) effy - efficiency 1000- to convert to kilograms from grams Production in kgs / 8 hrs (0.2836 x L x effy) / (Ne) L - delivery speed in m/min effy - efficiency Ne - English count Production / 8 hrs (Hank x Nd) /( Ne x 2.2045) Hank = no of hank (840 yards)delivered by the machine Nd = no of deliveries Ne = hank of the material Total draft in card (feed weight in g/m) / (sliver weight in g/m)

 Drawframe
 Break draft surface speed of 2nd roller / surface speed of back roller Main draft surface speed of 1st roller / surface speed of 2nd( middle) roller Total draft surface speed of delivery roller / surface of feed roller Production in kgs / 8 hrs (0.2836 x L x effy x Nd) / (Ne) L - delivery speed in m/min effy - efficiency Ne - english count Nd - No of delvieries Production in kgs / hr (FRD x FRrpm x 3.14 x 60 x effy x Nd) / (Ne x 840 x 36 x 2.2045) FRD - front roller dia in inches FRrpm - front roller rpm effy - efficiency Ne - Sliver hank Nd - number of deliveries

 Speedframe & Ringframe
 Twist / Inch (TPI) Spindle speed / FRS FRS - front roller surface speed in inches/mi FRS = FRrpm x 3.14 x FRD FRS - Front roller surface speed FRD - front roller diamete T.P.I T.M. x sqrt(count or hank) T.M. - Twist multiplier sqrt - square root Production in kgs / 8 hrs (7.2 x SS x effy) / (TPI x Ne x 1000) SS - spindle speed Spindle speed m/min x TPI x 39.37 Hank delivered spindle speed / ( tpi x 62.89) Ring traveller speed in m/sec (spindle speed x ring dia in mm x 3.14) / (60 x 1000)

 Winding
 Production in kgs / 8 hrs (0.2836 x L x effy x Nd) / (Ne) L - delivery speed in m/min effy - efficiency Ne - english count Nd - No of delvieries Production in kgs / hr ( L x 1.0936 x 60 x effy ) / (hank (Ne) x 36 x 840 x 2.2045) L - delivery speed in m/min effy- efficiency Ne - English count ( number of 840 yards in one pound) 840 - constant 2.2045- to convert from lbs to kilograms

##### Fiber Formulas

Commonly used fibre formulas and reference guides used by the textile fibre industry.

##### Yarn Conversions

Various yarn numbering systems and conversion formulas and tables for easy reference