METHOD FOR PRODUCING POLYESTER-BASED FIBER PRODUCT FOR RECYCLING, AND POLYESTER-BASED FIBER PRODUCT

• Main Authors: HANIDA OSAMU, SHIBATA CHIEKO, TAKAGI TAIJI, YONEZAWA KAZUHIRO
• Format: Patent
• Language: English; Japanese
• Published: 31.07.2023
• Subjects: BLEACHING LEATHER OR FURS; DRY-CLEANING, WASHING OR BLEACHING FIBRES, FILAMENTS, THREADS,YARNS, FABRICS, FEATHERS OR MADE-UP FIBROUS GOODS; FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR; LAUNDERING; TEXTILES; TREATMENT OF TEXTILES OR THE LIKE; TREATMENT, NOT PROVIDED FOR ELSEWHERE IN CLASS D06, OF FIBRES, THREADS, YARNS,FABRICS, FEATHERS, OR FIBROUS GOODS MADE FROM SUCH MATERIALS

To provide a method for producing polyester-based fiber product for recycling that can easily decolor dyed polyester-based fiber product without using a special method and by a method of low environmental load.SOLUTION: Provided is a method for producing polyester-based fiber product for recycling that includes a step of dyeing a polyester-based fiber having a rigid amorphous fraction of 55% or less using an alkali dischargeable type disperse dye at a temperature of less than 125°C to yield a polyester-based fiber product, and a step of decolorizing the polyester-based fiber product at a temperature higher than the dyeing temperature to yield a polyester-based fiber product for recycling.SELECTED DRAWING: None 【課題】特殊な方法を用いず、かつ環境負荷が低い方法により、染色されたポリエステル系繊維製品を容易に脱色することが可能な、リサイクル用ポリエステル系繊維製品の製造方法を提供する。【解決手段】剛直非晶分率が５５％以下であるポリエステル系繊維を、アルカリ可抜型分散染料を用いて１２５℃未満の温度で染色して、ポリエステル系繊維製品を得る工程と、前記染色における温度よりも高い温度で、前記ポリエステル系繊維製品を脱色して、リサイクル用ポリエステル系繊維製品を得る工程と、を含む、リサイクル用ポリエステル系繊維製品の製造方法。【選択図】なし