After on‑site placement of polypropylene yarn stretching machine, standardized installation and step‑by‑step commissioning reduce failure frequency in formal production and support stable output of qualified polypropylene filament. Some newly‑built or reconstructed chemical‑fiber production lines skip partial verification steps and feed raw materials for mass production directly, which raises risks of yarn breakage and uneven filament.

Leveling and component alignment lay foundation for installation. Deviation on horizontality and coaxiality of machine frame, drawing‑rollers and winding units brings vibration under high‑speed operation. Vibration transfers to running tow and causes evenness fluctuation as well as accelerated component wear. Calibration according to technical documents during installation cuts abnormal component loss in later operation.

Mechanical installation shall be followed by no‑load test run. Operators check transmission units, temperature‑control system and electric‑control feedback modules during idling. Response of rotating‑speed and temperature variation shall be recorded, while abnormal noise and alarm signals shall be eliminated before melt feeding.

Full design speed shall not be adopted at the initial feeding phase. Gradual speed‑up mode is recommended for spinning, drawing and winding. Operators observe tow forming, oiling performance and bobbin quality during speed rising. Samples are collected to test tenacity, elongation and thermal shrinkage for fine‑tuning process parameters.

Complete parameter records shall be kept during commissioning. Temperature, draw ratio, speed and other data matched for target products shall be filed for reference in later batch or specification switching. Detected abnormalities shall be solved before regular production.

Jiangxi Donghua machinery Co., LTD provides on‑site technical support for polypropylene yarn stretching machine. It assists customers in equipment positioning, step‑by‑step commissioning and trial‑production verification to help chemical‑fiber enterprises finish production‑line launching smoothly。