The punch density of a needle-punched nonwoven fabric is 50 punches/cm2
Q. The punch density of a needle-punched nonwoven fabric is 50 punches/cm2. If the stroke frequency of needle bed is doubled and the fabric delivery speed is halved, then the punch density (punches/cm2) would be
| (A) 25 | (B) 50 | (C) 100 | (D) 200 |