Stretching Device As Well As Manufacturing Device And Manufacturing Method For Fiber And Fiber Web

Abstract: In order to provide a stretching device that is capable of efficiently applying a traction force to yarns, thus making it possible to stably manufacture fine yarns while saving energy, the present invention provides a stretching device that stretches a yarn obtained by subjecting a thermoplastic polymer to melt spinning and blowing air onto the yarn inwardly from outside a transfer path of the yarn in a channel having an inlet and an outlet for the yarn, the stretching device being characterized in that the channel having the inlet and the outlet for the yarn is provided with a first airflow channel, an airflow jetting hole, a second airflow channel, a third airflow channel, and a fourth airflow channel, continuously in this order along the yarn transfer direction, and in that the following (i) to (iv) are satisfied. (i) The third airflow channel has a fixed flow channel sectional area along the yarn transfer direction. (ii) The second airflow channel has a smaller flow channel sectional area than the third airflow channel, and the flow channel sectional area thereof is fixed and/or gradually increases along the yarn transfer direction. (iii) The fourth airflow channel has a greater flow channel sectional area than the third airflow channel, and the flow channel sectional area thereof is constant and/or gradually increases along the yarn transfer direction. (iv) The length L2 of the second airflow channel in the yarn transfer direction, the length L3 of the third airflow channel in the yarn transfer direction, and the length L4 of the fourth airflow channel in the yarn transfer direction satisfy the following relationships: (L3 + L4) / (L2 + L3 + L4) = 0.6 and L4 / (L2 + L3 + L4) = 0.4.

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