Yarn manufacturing apparatus
A yarn producing apparatus that produces high-density carbon nanotube yarn at high speed. The yarn producing apparatus includes: a substrate support supporting a carbon nanotube (CNT) forming substrate; a winding device configured to continuously draw CNT fibers from the CNT forming substrate supported on the substrate support and to allow the CNT fibers to run; and a yarn producing unit provided between the substrate support and the winding device to directly take in the CNT fibers drawn by the winding device and twist the taken-in CNT fibers. The yarn producing unit false-twists the CNT fibers with a swirl flow of compressed air.
1. A yarn producing apparatus for producing carbon nanotube yarn from non-aggregated carbon nanotube fibers while allowing the carbon nanotube fibers to run, the yarn producing apparatus comprising:
a support configured to support a carbon nanotube assembly;
a drawing unit configured to continuously draw non-aggregated carbon nanotube fibers from the carbon nanotube assembly supported on the support and to allow the non-aggregated carbon nanotube fibers to run; and
a yarn producing unit provided between the support and the drawing unit to directly take in the non-aggregated carbon nanotube fibers drawn by the drawing unit and twist the taken-in carbon nanotube fibers, wherein
the yarn producing unit false-twists the carbon nanotube fibers with a swirl flow of compressed air,
wherein
the yarn producing unit includes
a nozzle body configured to allow the carbon nanotube fibers to pass through,
a first nozzle provided in the nozzle body to generate a first swirl flow, with compressed air, in a direction orthogonal to a direction of the carbon nanotube fibers running, and
a second nozzle provided in the nozzle body to generate a second swirl flow, with compressed air, in the direction orthogonal to the direction of the carbon nanotube fibers running and opposite to the direction of the first swirl flow,
the first nozzle and the second nozzle are provided at positions different in the direction of the carbon nanotube fibers running in the nozzle body,
the first nozzle and the second nozzle aggregate the non-aggregated carbon nanotube fibers,
the drawing unit includes a nip roller unit including a pair of rollers, and
a distance between the carbon nanotube assembly supported on the support and the yarn producing unit is smaller than a distance between the yarn producing unit and the nip roller unit.
2. The yarn producing apparatus according to claim 1 , wherein
the first nozzle is provided on an upstream side from the second nozzle in the direction of the carbon nanotube fibers running, and
a pressure of the compressed air for forming the first swirl flow is lower than a pressure of the compressed air for forming the second swirl flow.
3. The yarn producing apparatus according to claim 1 , wherein
the first swirl flow generated in the first nozzle mainly twines part of an outer layer of the carbon nanotube fibers, and
the second swirl flow generated in the second nozzle mainly false-twists the carbon nanotube fibers to aggregate the carbon nanotube fibers.
4. The yarn producing apparatus according to claim 1 , wherein the nozzle body has an air escape portion between the first nozzle and the second nozzle.
5. The yarn producing apparatus according to claim 4 , wherein the air escape portion is a notch cut in the nozzle body.