Conventional PP filament cannot be dyed under water bath because it has no polar group in its polymer chains. Instead, the color has to be imparted on the fiber-extrusion stage through solution dyeing. Yen Sign has developed a revolutionary new polypropylene filament, Comfo-FilR dye-able polypropylene filament, which fits the needs of facile dyeing and polypropylene characteristics by incorporating an additive within the polypropylene filament. The filament can be dyed using conventional dyes in a manner similar to that used for polyester filament.
