Large‑scale non‑woven plants consume polypropylene staple fiber continuously and perform frequent batch change‑over. Many factories feed new‑batch material right after exhausting old stock without transition arrangement. Even if every batch of polypropylene staple fiber meets specification requirements, minor performance gaps may cause web‑forming fluctuation and unstable fabric physical properties during transition period and generate non‑conforming intermediate products.

Different batches of polypropylene staple fiber still have subtle deviation in crimp, oil pickup and length dispersion within allowable tolerance. Complete abrupt material switch without adaptive fine‑tuning for carding and hot‑rolling parameters brings short‑term fluctuation of web weight uniformity and tensile property. For automotive interior and filter materials with strict consistency requirements, such fluctuation will cause finished goods failing acceptance test.

Mixed‑feeding transition is a reliable solution. Blend old and new batches at adjustable mixing ratio and gradually shift proportion from old stock towards new stock to offer buffer for production line. Increase sampling frequency during change‑over and inspect web weight and fabric tenacity, observe surface defects. Do not copy all process parameters from former batch; adjust opening‑carding gauge and hot‑rolling temperature‑pressure according to trial results.

Warehouse shall separate different batches of polypropylene staple fiber with clear marking to prevent mis‑blending. Avoid random mixing of bales from different batches during unpacking and feeding to reduce human‑induced batch disorder. When delivering large‑volume orders, Hubei Botao Synthetic Fiber Co., LTD provides full set of batch test reports for customers’ reference and offers practical suggestions for batch transition operation.

Standardized change‑over workflow instead of abrupt material replacement effectively cuts transitional defective products, guarantees consistent performance among non‑woven batches and reduces economic loss caused by raw‑material switching.