Question 40 (Textile Engineering & Fibre Science)
A carded web of 30 g/m2 and 1 m width is converted into a batt of 300 g/m2 and 2.5 m width by a cross lapper. The card delivers the web at 20 m/min. The batt out of the cross lapper approximately at the speed (m/min) of
| (A) | 1 |
| (B) | 2.5 |
| (C) | 5 |
| (D) | 8 |
[Show Answer]
Option A is correct.
Given-
Weight of carded web=30g/m2
Width of carded web=1 m
Weight of batt=300 g/m2
Width of batt=2.5m
Delivery rate of card web=20 m/min
The batt speed=?
The number of layers=Weight of batt/Weight of carded web
The number of layers=300/30
The number of layers=10
Now,
Delivery rate of card web x Width of carded web=The number of layers x The batt speed x Width of batt
20 x 1=10 x The batt speed x 2.5
The batt speed =20/25
The batt speed =0.909
The batt speed approximately=1 m/min (Ans)