08
2025
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09
The edges of the fabric curl up as soon as they’re pulled, yet the fully automatic fabric handling system can’t grip the edges?
The differing stitch densities on the front and back sides of the irregular ribs, combined with the shrinkage of spandex, generate an imbalance torque exceeding 0.6 N·m at the fabric edge.
Cause: The uneven ribbing results in different stitch counts on the right and wrong sides, and the shrinkage of spandex further induces an imbalance torque at the edge exceeding 0.6 N·m.
Three-step setting machine presets:
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Wetting: Immerse in a hydrophilic softening agent at 3 g/L, achieving an absorption rate of 8% to swell the fibers and relieve internal stresses.
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Excess feed: needle chain width = finished width + 4 cm; with a 12% excess feed, stretch the edge outward.
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Low-temperature curing: 170°C for 25 seconds; spandex shrinkage < 2%, with a soft hand feel retained.
Results: Edge curling decreased from 8 mm to < 3 mm, stiffness was reduced by 20%, the automatic deployer achieved a 100% grasp success rate, and cutting tolerance was ≤ 1 mm.
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