METHOD FOR PRODUCING ACRYLIC FIBER BUNDLE AND METHOD FOR PRODUCING CARBON FIBER BUNDLE

• Main Authors: ENDO HIROTADA, HAYASHIDA KENGO, NAKANO MASAKI
• Format: Patent
• Language: Chinese; English
• Published: 06.09.2019
• 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 addresses the problem of ensuring ample cleaning and preventing blending between adjacent thread bundles and preventing fluffing of individual fibers in a cleaning step in stepsfor producing acrylic fiber bundles, in order to obtain high-quality acrylic fibers and carbon fibers. 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 alocation on the downstream