LMW Spinpact SIRO Compact: Measurable Gains for Polyester Staple Fiber Spinning

# What this report covers

# Raw material and process details LMW used PSF specified as 44 mm × 1.4 D. Conventional spinning produced Ne 30s on LR 9/AX machines. The SIRO compact process produced Ne 60/2s (equivalent to 30s SIRO) on LRJ 9/SX (Spinpact) machines. The trials therefore compared like-for-like finished counts while using compacting technology and Spinpact attachments in the SIRO setup.

# Quantified performance differences LMW reports measurable, repeatable advantages with the Spinpact SIRO suction compact system versus conventional ring spinning on PSF:

• Productivity (GPSS): +14.76%.
• Count Strength Product (CSP): +14.92%.
• Yarn unevenness (U%): -18.61%.
• Total imperfections per km (IPI): -29.41%.
• Hairiness index (HI): -30.08%.
• Tenacity (cN/Tex): +12.51%.

These numbers describe both higher output per spindle shift and improvements in yarn structure: strength, regularity, surface finish, and fewer defects.

# Why the improvements occur (process-level points) LMW attributes gains to the suction compacting action and optimized mechanical design of the Spinpact system. Compacting reduces fiber spread in the spinning triangle and improves fiber integration into the yarn body. Better drafting control and fiber alignment reduce mass variation and migration, which lowers imperfections and hairiness and improves tenacity and CSP. The suction element also supports stable spinning at elevated productivity.

# Practical implications for mills For mills processing PSF or moving to a more MMF-heavy fiber mix, the trial suggests two concrete outcomes:

• Higher effective production: the nearly 15% GPSS gain increases output without adding spindles or floor space.
• Better downstream performance: lower imperfections and hairiness can reduce fabric defects, improve loom efficiency, and reduce rework or waste.

# Where this matters most India remains more cotton-centric than global markets, but PSF is growing. For spinning mills that want to process more polyester or blended fibers while controlling quality and productivity, suction compact systems like Spinpact SIRO represent a production upgrade that can be integrated into existing full-line LMW installations.

# Bottom line LMW's published trial data show consistent, measurable improvements in both productivity and multiple yarn quality parameters for 100% PSF when using the Spinpact SIRO suction compact system versus conventional ring spinning. The results point to operational gains for mills increasing MMF processing.