The heating‑roller system of polypropylene yarn stretching machine undertakes dual functions of yarn drawing and heat‑setting. Temperature uniformity and rotating‑speed synchronization of heating‑rollers directly determine breaking strength, thermal shrinkage and evenness of polypropylene filament, which constitute key units for commissioning and maintenance. Besides raw‑material factors, abnormal working condition of heating‑roller system often causes strength fluctuation and scattered shrinkage indicators in chemical‑fiber factories.

Surface‑temperature distribution of heating‑rollers shall remain stable. Large local temperature difference leads to inconsistent molecular orientation of tow passing through different thermal zones and performance dispersion within one batch. Temperature‑control modules shall be calibrated regularly and heating‑components shall be inspected to prevent production deviation caused by single‑point temperature drift.

Synchronization accuracy among multiple heating‑rollers also deserves attention. Draw ratio is realized through speed difference between front and rear rollers. Rotating‑speed deviation makes actual draw ratio differ from set value. Insufficient drawing fails to reach target tenacity. Excessive drawing brings internal stress, post‑production shrinkage deformation and higher yarn‑breakage risk.

Roller surface condition needs periodical inspection and cleaning. Scratches and attachments scratch running tow and generate fuzz under high‑speed operation. Scheduled surface cleaning removes melt precipitates and guarantees smooth yarn passage.

When switching production denier or adjusting formula, original temperature and speed parameters cannot be copied directly. Lab trials are required for parameter tuning. Mass production can start after finished‑yarn indicators pass verification.

Jiangxi Donghua machinery Co., LTD pays attention to configuration and assembling precision of heating‑roller system for polypropylene yarn stretching machine. It provides process suggestions for geotextile, rope‑net and lifting‑strap production and supports customers on production‑line commissioning.