What are the advantages of edgeless rolls compared to traditional hard-edge rolls?

【Summary】 Smooth unwinding: The soft-edge roll design features a seamless, non-ridged edge, eliminating the sharp protrusions found in traditional hard-edged rolls. This results in unwinding tension fluctuations of ≤±5% even at high-speed weaving speeds—such as 1200 rpm on jet looms—leading to a more than 50% reduction in yarn breakage rates. While conventional hard-edged rolls typically experience 2–3 yarn breaks per 10,000 meters, the edgeless design can reduce this rate to just 0.5–1 break per 10,000 meters or even lower.

1. Improved unwinding efficiency, reducing the breakage rate in downstream processes

• Smooth unwinding: The soft-edge roll design features a seamless, non-ridged edge, eliminating the sharp protrusions found in traditional hard-edge rolls. This results in unwinding tension fluctuations of ≤±5% even at high-speed weaving speeds—such as 1200 rpm on jet looms—leading to a more than 50% reduction in yarn breakage rates. While conventional hard-edge rolls typically experience 2–3 yarn breaks per 10,000 meters, the edgeless design can reduce this rate to just 0.5–1 break per 10,000 meters.

• Compatible with automation equipment: It can directly interface with automatic winding machines and warping machines, eliminating the need for manual yarn-guiding intervention—perfectly suited to meet the demands of transforming textile factories into "dark factory" operations.

2. Increased roll capacity reduces downtime during roll changes

• Weight is increased by 15%-20%: Taking a 200mm-diameter tube as an example, a traditional hard-edge roll typically weighs around 3 kg, while the edgeless version can reach 3.5–3.6 kg. This reduction in weight also cuts down on tube-changing frequency by 15%, making it ideal for large-scale, continuous production—such as on knitting circular machines that can run continuously for up to 8 hours without needing a tube change.

• Uniform roll density: The density difference between the inner and outer layers of the roll is ≤5% (compared to up to 15% with traditional hard-edge rolls), preventing tension fluctuations during unwinding caused by density variations.

3. Reduce raw material waste and lower overall costs

• Improved Edge Utilization: Traditionally, about 5% of yarn at the edges of hard-edge rolls remains unusable due to the inability to unwind these sections. In contrast, edgeless technology, which forms soft edges during production, reduces waste to below 1%. This optimization translates to cost savings of approximately 1,000 yuan per ton of yarn—calculated based on the average price of synthetic fiber raw materials at 15,000 yuan per ton.

• Eliminate the hard-edge trimming process: Traditional methods require manual trimming of edges, incurring labor costs of approximately 200 yuan per ton of yarn—however, the seamless edge technology completely eliminates this step.

4. Improve product quality and reduce defects in downstream processes

• Avoid "hard-edge printing" defects: Traditional hard-edge rolls are prone to "sudden tension changes" during unwinding, which can cause horizontal or vertical streaks on the knitted fabric. Edgeless rolls, however, can reduce such defect rates from 3% down to below 0.5%.

• Improved twist consistency: Enhanced uniformity in package formation reduces the difference in twist between the inner and outer layers of the yarn to within ±1%, ensuring even dyeing and significantly boosting colorfastness by at least 0.5 grade or more.