It then goes to the working zone of the machine and passes in-between a pair of perforated bed plates. The needles are arranged in a needle board in width-wise rows. The needle board is mounted on a beam which is given an up and down reciprocating motion by means of an eccentric crank mechanism. In the down stroke mode, the needles descend through the perforations of the top bed plate, through the web, and through the perforations of the bottom bed plate. During the upstroke, the barbed needles withdraw upwards and the bed plate strips the web off the needles. As a result, the fibres are mechanically interlocked, thereby providing the mechanical strength. The needle bonded nonwoven is delivered by a pair of delivery rollers.