Alleviating discolouration of cellulosic fibres under high temperature condition

Saal A
Donnerstag, 14.09.2023, 10:15 - 10:40 Uhr

In view of this prior art the problem to be solved consisted in finding a solution to minimize the yellowing (discoloration) of cellulosic fibers or regenerated fiber and their blends regardless of its form (fiber, yarn, fabric, etc.) undergoing high temperature treatment which is required for drying or heat-setting or molding or thermosoling or curing process or combining treatments.
It is an object of the present invention to provide a method for preventing or alleviating the yellowing of cellulosic fibers during high-temperature treatments (i.e. heat-treating at 180°C or higher, e.g. in heat-setting, thermosoling and molding processes for end-articles), wherein the fibers are

  1. treated with an aqueous solution with a pH controlled between 4.0 and 7.0 and containing a protective agent, subsequently
  2. dried, and subsequently
  3. high-temperature treated.