The upgraded solution adopts black chips at the stage of polymerization, then goes to spin directly. Hence the color distributes much more evenly than the traditional method, which mixes black color concentrate with nylon 6 chips, preforming an unstable consistency
To win at the starting point: applying black nylon 6 chips leads to a unified chromaticity from the microscopic molecular level, meaning pure black without a color difference.
No need to dye: reduce energy e.g. water, electricity, and gas, efficiency increased with low carbon footprint.