Abstract
A stuffer-box crimping unit was fabricated based upon the principle of heating, buckling, and cooling, and its process mechanics was evolved. Buckling theory was substantiated to negate the long-standing view of crumpling action inside the stuffing tube. Nylon 6 multifilament yarns of 70 den/17 fil and 105 den/17 fil were processed at 150, 170, and 190°C. The breaking load, buckling length, and crimp angle decreased with increase in temperature, while the denier, elongation, and work of extension at fifth cycle of loading showed an increase.
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