During production, the work roll is entangled with cotton. Most of the reasons are that the low oil content of the fiber causes the friction coefficient between the fiber and the card clothing to be abnormal, and the fiber sinks under the card clothing. When moving, it gradually melts and becomes hard cotton through constant friction and compression between the card clothing and the card clothing.

To eliminate entanglement, the method of lowering the work roll can be used to remove the entanglement on the roller.