| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a polyester blended yarn having a large elongation difference between filament groups, by which the breakage of the yarn on the spinning of the filaments is reduced to enable a stable continuous operation. SOLUTION: This method for producing the polyester blended yarn, comprising doubling a filament group A with a filament group B and then winding up the doubled yarn, in that a collecting device for collecting the filament group A is disposed at a position where a distance GA between the collecting device and a spinneret face for spinning the filament group A is larger than a distance GO between the spinneret face and the necking start point of the filament group A and is <=200 cm. The filament group A is prepared by adding a polymethyl methacrylate-based polymer and/or a polystyrene-based polymer to a substrate polymer comprising a polyester and then melting, kneading, and spinning the mixture. The filament group B comprises the substrate polymer and is prepared by spinning the matrix polymer from the same spinneret or a spinneret otherwise disposed.
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