Moisture content is an easily‑overlooked indicator for Polypropylene masterbatch. Excessive moisture of polypropylene masterbatch vaporizes under high‑temperature melt‑spinning conditions and brings multiple interferences to spinning procedures and finished‑fiber quality. Bubble yarn, yarn breakage and micro‑hole defects on chemical‑fiber production lines can be partly attributed to excessive moisture of polypropylene masterbatch, besides raw‑material and equipment factors.

Polypropylene masterbatch absorbs moisture from ambient air during storage and transportation. Broken package seals accelerate water adsorption especially in high‑humidity seasons. When moist Polypropylene masterbatch enters screw extruder, water vaporizes rapidly under high temperature and forms tiny bubbles inside melt. Micro‑hole monofilaments appear after extrusion through spinnerets and weaken fiber mechanical properties. Severe bubble outbreak may cause mass yarn breakage and interrupt continuous production.

Spinning processes hold different tolerance ranges for moisture content of polypropylene masterbatch. Higher standards shall be adopted for fine‑denier and super‑fine‑denier fiber spinning. Manufacturers shall implement sufficient drying after granulation as well as well‑sealed finished‑goods packages to block external moisture and keep original moisture indicators of polypropylene masterbatch.

For downstream users, warehouses shall be dry and ventilated. Opened Polypropylene masterbatch shall be put into production as soon as possible instead of long‑time open‑air storage. Pre‑drying treatment is recommended before production under high‑humidity conditions to remove adsorbed moisture prior to blending with base polypropylene resin.

Moisture‑content sampling test is suggested while switching batches. Process parameters can be adjusted according to on‑machine performance to reduce production abnormalities induced by moisture.

Yancheng Ruize color masterbatch Co., LTD emphasizes drying and sealed‑package procedures and strictly controls moisture indicators of polypropylene masterbatch. It supplies suitable polypropylene masterbatch for filament, staple fiber and non‑woven fabric spinning and offers technical suggestions for storage and application.