Color Hue Correction in Synthetic Yarn Extrusion

The patent uses solid masterbatch containing colorants that are dispersed in the polymer melt during extrusion. This solid masterbatch acts as a stable, heat-resistant coloring agent that does not degrade at spinning temperatures (280-300°C), unlike liquid coloring agents. The masterbatch maintains viscosity and thermal stability while enabling precise color hue correction through controlled addition during the extrusion process.

The patent achieves color tone correction by changing the concentration and type of colorants in the masterbatch formulation. Instead of using expensive chemically modified metal phthalocyanine, the invention uses conventional colorants (such as carbon black, iron oxides, or organic pigments) in optimized concentrations and combinations. This parameter optimization allows precise color matching within tolerances at a fraction of the cost of proprietary chemical modifications.

The patent extracts the problematic liquid carrier component from the liquid-masterbatch formulation and replaces it with solid polymer-based masterbatch. By removing the liquid carrier that causes degradation at spinning temperatures, the invention maintains color correction capability while preserving the physical properties of the synthesized yarns. The solid masterbatch is incorporated into the polymer matrix without compromising strength, elongation, or thermal resistance.

The patent merges the color correction function with the existing extrusion process by incorporating the masterbatch into the polymer feedstock. The colorants are blended with the polymer granules before extrusion, allowing simultaneous melting, mixing, and color correction in a single continuous operation. This integration avoids separate coloring steps and maintains high productivity while using standard extrusion equipment.