Many colored polyester spinning plants suffer abnormal pressure rise of spinning packs. Filter screen replacement cycles become much shorter and frequent pack disassembly causes heavy loss of effective production time. Technicians usually check PET chip quality, spinning temperature and filter sand configuration first. However, rapid pressure rise still exists after repeated parameter tuning. The root cause often lies in pigment dispersion performance of polyester fiber masterbatch.

Polyester spinning operates under 280‑290℃, which sets strict requirements on pigment fineness and dispersion of masterbatch. Hard pigment agglomerates inside masterbatch cannot be fully disintegrated under screw shear. Those tiny accumulates keep depositing in spin‑pack filter layers and increase filtration resistance during production, resulting in fast pressure climbing. In severe cases, agglomerates pass through filters, block spinneret orifices and trigger cascading defects such as fuzz, yarn breakage and fabric color specks.

Many purchasers only check color shade while ignoring filter‑pressure‑rise indicator. The same masterbatch behaves differently for filament, staple fiber and fine‑denier production. Lab test reports are not sufficient; small‑scale machine trial according to actual production line is recommended to monitor pressure trend during long‑run production. Simply adopting finer filter screens can only relieve symptoms instead of eliminating agglomeration risks fundamentally.

Yantai Langcai Plastic Technology Co.,Ltd. specializes in R&D and manufacturing of chemical‑fiber masterbatch with annual capacity of 10,000 tons. Its polyester fiber masterbatch optimizes carrier and pigment dispersion for high‑temperature PET spinning, restrains pigment agglomeration and slows spin‑pack pressure increment. It fits polyester filament, staple fiber and non‑woven production. Supported by dedicated test base, sample trial service is available. Technical suggestions on adding ratio and process adjustment are offered according to customer screw equipment and filter configuration to cut unplanned shutdown loss.

For large‑scale colored polyester production, dispersion capability of polyester fiber masterbatch largely determines continuous operation efficiency of spinning lines.