Method for producing acrylic fiber bundle and method for producing carbon fiber bundle

• Main Authors: NAKANO, MASAKI, ENDO, HIROTADA, HAYASHIDA, KENGO
• Format: Patent
• Language: Chinese; English
• Published: 01.10.2018
• Subjects: APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBONFILAMENTS; CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS,THREADS, FIBRES, BRISTLES OR RIBBONS; MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OFARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES ORRIBBONS; NATURAL OR ARTIFICIAL THREADS OR FIBRES; SPINNING; TEXTILES

The present invention is a method for producing an acrylic fiber bundle in which an acrylic polymer solution is spun to make a solidified thread bundle, and thereafter at least an in-bath treatment step and an oiling step are performed on the solidified thread bundle, wherein: the in-bath treatment step comprises an in-bath cleaning step; the in-bath cleaning step is a step where a plurality of solidified thread bundles run in parallel through and are cleaned in at least one cleaning bath provided with a cleaning solution inflow section and outflow section; at least one cleaning bath is a countercurrent cleaning bath in which cleaning solution flows in from an inflow section that is at a location on the downstream side of the direction of travel of the solidified thread bundles, and flows out from an outflow section that is at a location on the upstream side of the direction of travel of the solidified thread bundles; the mean coefficient of variation of the linear speed of the cleaning solution in the inflow