Based on the loop structure characteristics of weft-knitted folded auxetic fabrics, a new small-course knitting pattern was designed using a combination of face loops and back loops. Fully drawn polyester yarn, draw-textured nylon yarn, and nylon–spandex covered yarn were selected for fabric manufacture using a flat knitting machine. By designing four different arrangements of elastic and inelastic yarns along the crosswise direction and conducting Poisson’s ratio tensile tests, a theoretical mechanical rigid rotation model between horizontal and vertical loops was constructed, based on the special geometric shape of the fabric plane. Equation establishment and numerical theoretical analysis were used to reveal the deformation mechanism. Drawing on theoretical insights, experiments were conducted to explore the influence of such factors as yarn modulus, loop length, and yarn elastic properties on the auxetic effect of the fabric. Experimental results show that when elastic and inelastic yarns were alternately arranged, the fabric surface exhibited a regular wavy pattern of interlocked horizontal and vertical loops, and the fabric achieved auxetic properties for a wide degree of stretching.
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