Introduction
The textile industry is undergoing a paradigm shift toward sustainability, with recycled polyester emerging as a key raw material. Despite its environmental advantages, recycled polyester fibers often exhibit nconsistent length distribution, surface damage, and reduced uniformity, making spinning more
complex than virgin fibers.
Conventional ring spinning systems tend to amplify these inconsistencies, resulting in higher imperfections and lower yarn strength. To address these limitations, advanced Compact Spinning technologies have been developed. LMW’s Spinpact – The Suction Compact Spinning Technology
enhances fiber alignment and compaction, thereby improving yarn structure and performance.
This article evaluates the effectiveness of LMW’s Spinpact technology in processing recycled polyester yarns of count Ne 40s.
Raw Material
Recycled polyester was categorized into three sample variants:
44 mm × 1.5 denier (Green dyed)
44 mm × 1.5 denier (Grey)
38 mm × 1.5 denier (Brown dyed)
These variants represent commonly available recycled fiber profiles with variations in cut length and dyeing conditions.
Machine Setup
The material was processed in LMW ring frame LRJ 9 equipped with Spinpact technology and LMW
Preparatory. Key trial conditions:
-Yarn Count: Ne 40s
-Spinning Mode: Spinpact (suction compact spinning)
-Medium Cradle
-Comparison Basis: Normal Ring Spun Yarn vs Spinpact Yarn
Parameters Tested
Yarn samples were tested for key quality parameters as below,
Evenness (U%)
Imperfection Index (IPI)
Hairiness Index (HI)
Lea Strength (CSP)
Tenacity (RKM)
Synopsis
– Yarn Evenness
Spinpact yarn demonstrated significantly improved evenness compared
to conventional yarn.
– Imperfections (IPI)
IPI values showed noticeable improvement, with reduced thin places, thick places, and neps.
–Hairiness
Hairiness Index (HI) values confirm reduced protruding fibers
–Strength Properties
The increase in RKM and CSP values demonstrates enhanced fiber integration and load distribution
within the yarn structure.
–Machine Performance
The process demonstrated,
Smooth running performance
No abnormal end breakage trends
Stable drafting behaviour
Consistent yarn build-up
These results indicate that Spinpact technology effectively compensates for the variability inherent in recycled fibers.
Spinpact – Suction Compact System
From a process standpoint, Spinpact enables smoother machine performance with reduced end breakages and consistent running behaviour, improving overall productivity. Its capability to efficiently
handle shorter and variable fibers makes it highly suitable for sustainable spinning applications. The resulting yarn demonstrates superior downstream performance in knitting and weaving, with improved fabric appearance, reduced pilling, and better process efficiency across the textile value chain.