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Common Formulas
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  CALCULATIONS:
  • 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) / 1.605
  CARDING:


(1). P =( L x 1.0936 x 60 x effy ) / (hank (Ne) x 36 x 840 x 2.2045)
P - production in kgs / hr
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
 
(2).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
 
(3). production in kgs / 8 hrs = (0.2836 x L x effy) / (Ne)
L - delivery speed in m/min
effy - efficiency
Ne - English count
 
(4).prodn / 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
 
 
(5).Total draft in card = (feed weight in g/m) / (sliver weight in g/m)

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  DRAWFRAME:


(1.)Break draft = surface speed of 2nd roller / surface speed of back roller
 
(2).Main draft = surface speed of 1st roller / surface speed of 2nd( middle) roller
 
(3).Total draft = surface speed of delivery roller / surface of feed roller
 
(4).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
 
(5.).prodn 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

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  SPEEDFRAME + RINGFRAME


(1).Twist / Inch (TPI) = Spindle speed / FRS
FRS - front roller surface speed in inches/min
 
(2).FRS = FRrpm x 3.14 x FRD
FRS - Front roller surface speed
FRD - front roller diameter
 
(3).T.P.I = T.M. x sqrt(count or hank)
T.M. - Twist multiplier
sqrt - square root
 
(4).prodn in kgs / 8 hrs = (7.2 x SS x effy) / (TPI x Ne x 1000)
SS - spindle speed
 
(5).Spindle speed = m/min x TPI x 39.37
 
(6).hank delivered = spindle speed / ( tpi x 62.89)
 
(7).Ring traveller speed in m/sec =( spindle speed x ring dia in mm x 3.14) / (60 x 1000)

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  WINDING:


(1). 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
 
(2). P =( L x 1.0936 x 60 x effy ) / (hank (Ne) x 36 x 840 x 2.2045)
P - production in kgs / hr
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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