Fiber-Grade Spinning Masterbatch for Polyester, Nylon and PP Fibers

Fiber-grade spinning masterbatch is a highly loaded pigment concentrate compounded into cylindrical granules for direct metering into melt spinning lines. BASTONE formulates the product around one governing constraint that separates fiber masterbatch from injection or film grades: the melt must pass through spinneret holes measured in tens of microns, thousands of times per minute, without a single agglomerate large enough to interrupt a filament. Every parameter in the specification exists to serve that constraint.

Dispersion is measured at FPV ≤ 0.1, the filter pressure value that spinners use as the practical proxy for spinneret life. A low FPV means pigment particles are broken down and wetted into the carrier resin rather than sitting as clusters, so pack pressure rises slowly and filter screens run longer between changes. Spinneret clogging and the resulting filament breaks are the dominant cost driver in colored fiber production, and dispersion quality is what controls them.

Temperature resistance spans 250–300°C, covering the full melt processing window for PET, PA6, PA66, and polypropylene spinning. Within that range the pigment system resists decomposition and shade drift, so a lot spun on Monday matches the same lot spun on Friday. Lightfastness rates 7–8 on the blue wool scale, which supports outdoor and long-service textile end uses where fading would otherwise limit application. Moisture content stays at ≤ 0.1%, preventing hydrolytic degradation of polyester melt and the void defects that trapped water causes in filament.

BASTONE manufactures the product in-house rather than reselling a third-party compound. The Hangzhou production facility runs the full sequence — pigment pre-treatment, carrier compounding, twin-screw dispersion, pelletizing, and drying — under one quality system, and the group's R&D center handles formulation development and batch testing. Direct control over compounding lets BASTONE hold color and dispersion consistent from lot to lot, and lets the technical team adjust a formulation when a customer's carrier resin, denier, or spinning temperature calls for it.

The masterbatch does not degrade the mechanical properties of the finished fiber, and it meets textile industry environmental standards for articles in direct skin contact — a requirement for apparel, bedding, and hygiene non-wovens rather than an optional claim.