An improvement for collecting waste in a carding machine beneath the feed and lickerin rolls having a plenum chamber and duct with an inlet nozzle and a downwardly sloping collecting chute, and side doors enclosing a lickerin waste-collecting chamber provided with an opening through which air flow currents are induced to flow transversely and downwardly to remove and cause the flow of waste downwardly to the inlet nozzle of the plenum chamber.