Ring-spun negative Poisson's ratio yarn and its composite spinning device, method and application

Abstract

The invention provides a ring spun negative-Poisson's-ratio yarn which includes relatively rigid and externally wrapped-wound endless tows and relatively flexible short fiber strands located in a yarn core. The negative-Poisson's-ratio compound structural yarn obtained through asymmetrical two-axis system compound spinning on a ring spinning frame. When the yarn is stressed and stretched, the stretch wound spirally and externally are straightened, the original straightened and thicker short fiber strands are thus spirally wound externally, so that a yarn body becomes thick to form negative-Poisson's-ratio deformation. The invention also provides a compound spinning device and method and application of the ring spun negative-Poisson's-ratio yarn. The short fiber strands are directly straightened through compound spinning on the ring spinning frame and are output at a central shaft position from a front roller jaw. The endless tows are output from the front roller jaw in a tension-free overfeeding mode and are externally wrapped, wound, compounded and twisted with the short fiber strands at a certain converging angle in an obvious-compressive deformation mode to form the yarn. The device is simple in structure and convenient to operate, and the obtained negative-Poisson's-ratio yarn can be used for negative-Poisson's-ratio fabrics and has a more obvious negative-Poisson's-ratio effect.

Description

technical field [0001] The invention relates to the technical field of negative Poisson's ratio deformable composite yarn and its composite spinning, and is an abnormal negative Poisson's ratio textile and a new preparation technology thereof, in particular to a negative Poisson's ratio composite structure yarn. Background technique [0002] Negative Poisson’s ratio yarn refers to a yarn whose apparent diameter will become thicker due to stretching when the yarn is stretched axially. [0003] Similar to the US patent (P Hook, Uses of auxetic fibers, patent number: US8002879 B2, 2011), the main content is the physical characteristic index of the negative Poisson's ratio fiber aggregate and various uses of the negative Poisson's ratio fiber aggregate. Such negative Poisson's ratio fibers can be used in: interconnected collections of negative Poisson's ratio fibers, which can be in the form of parallel arrays of fiber assemblies, woven fabrics, knitted fabrics, nonwovens, felts...

AI Technical Summary

Problems solved by technology

[0016] To sum up, the patents given above and the existing research have the following two problems that have not been addressed or resolved: first, whether the negative Poisson’s ratio yarn can break through only the simplest elastic filament / filament Due to the limitation of preparation in the combination, it is more practical to use short-fiber strands / filament composite structure yarns, because short-fiber yarns are usually softer and more easily deformed, and it is difficult to obtain a higher negative Poisson's ratio, or even a negative Poisson's ratio Second, the formation of negative Poisson’s ratio yarns is just a general intermittent production of filaments / filaments. Can high-modulus filaments be synchronized with high twist and high One-step composite spinning of elastic staple fiber strands is the key technology for forming negative Poisson's ratio long / short composite yarns

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