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A four-die spin Using four sets of die heads (S/M/M/S), melt nonwoven fabric is a type of composite nonwoven fabric that combines spunbond with melt blown technologies. Spunbonded non-woven fabric (S), melt blown non-woven fabric (M), melt blown non-woven fabric (M), and spunbonded non-woven fabric (S) are the "four die heads" that stand in for these materials, respectively.