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Yarn Spinning Formulas

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

3 20,940

Common Spinning Formulas

Grams per Meter0.5905 / Ne
Grams per Yard0.54 / Ne
Texden x .11 = 1000/Nm = Mic/25.4
NeNm/1.693
DRAFT(feed weight in g/m) / (delivery weight in g/m)
DRAFTTex (feed)/Tex(delivery)
DRAFTdelivery 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 draftsurface speed of 2nd roller / surface speed of back roller
Main draftsurface speed of 1st roller / surface speed of 2nd( middle) roller
Total draftsurface 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 FRDFRS – Front roller surface speed

FRD – front roller diamete

T.P.IT.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 speedm/min x TPI x 39.37
Hank deliveredspindle 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

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