Dope-Dyed Functional Staple Fiber

Two-masterbatch co-blending spinning: Color masterbatch supplies pigment, while functional masterbatch carries functional powder or additives. They are metered, dried and melt-extruded together with PET chips. Homologous carrier resin ensures independent and uniform dispersion of pigment and functional powder inside the melt.Dispersion control is the core challenge. The particle size of inorganic functional powder is strictly controlled. When pigment and functional powder coexist, agglomeration easily occurs. Agglomerates block the spin pack, raising pressure and causing filament breakage. Formulation is optimized with suitable dispersants and screw shear parameters.Balance between loading and fiber performance: Higher total masterbatch loading increases melt viscosity and deteriorates drawability. Formulation follows the principle of minimal loading to meet target performance instead of over-dosing.Mutual interference between shade and functional powder: Some functional powders have intrinsic tint and shift final color, which must be considered in color matching. Dark shades consume more pigment, leaving limited allowance for functional masterbatch.