Nonwoven Fabric Manufacturing Method

Abstract: Provided is a nonwoven fabric manufacturing method for stably manufacturing nonwoven fabric while preventing occurrence of yarn breakage even when an advanced species to be a monofilament fineness filament is manufactured and even when the number of discharge ports of a spinneret is increased or a spinneret is lengthened for improving productivity, the method comprising melt-spinning a thermoplastic polymer via a plurality of discharge ports arranged in the long side direction and the short side direction of a rectangular spinneret, blowing air flow, by a cooling device, against a rectangular traveling area, in which a plurality of filaments obtained travels, from the outside toward the inside of the long side of the rectangle, and collecting the cooled plurality of filaments in a web form, wherein a suction device having suction ports over the whole periphery of the rectangular traveling area is provided between the spinneret and the cooling device in terms of the traveling direction of the filaments, and suction flow rate QL and suction flow rate QS are adjusted to satisfy 1< QS/QL < 5, with suction flow rate QL being the suction flow rate per unit length and per unit time at the suction ports on the long side of the rectangular traveling area, and suction flow rate QS being the suction flow rate per unit length and per unit time at the suction ports on the short side of the rectangular traveling area.

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