A speed frame with all the drafting rollers of 25.4 mm diameter has the following process parameters: Roving count – 1.5s Ne; Front drafting roller speed – 220 rpm; Roving diameter – 3.0 m; Roving Twist Multiplier – 1.2 tpi Ne-1/2, Empty bobbin diameter – 76.2 mm.
Question 48 (Textile Engineering & Fibre Science)
Spindle speed will be
(A) | 824 rpm |
(B) | 968 rpm |
(C) | 1016 rpm |
(D) | 1106 rpm |
[Show Answer]
Given in the question-
Diameter of all drafting rollers(D)=25.4 mm
meter
Roving count=1.5s Ne
Roving diameter=3.00 mm
Front roller speed(N)=220 rpm
Empty bobbin diameter=76.2 mm
Spindle speed=?
Calculation-
Where ,
D=Dia of roller
N=front roll speed
FRD=17.55 m/min
FRD=17.55 X 39.34 inch/min
FRD=690.42 inch/min
And
TPI=1.47 turns per inch
Now,by formula-
Spindle speed=1014.91
=1015 rpm (Ans)
Option C is approx correct.