A novel concept to produce periodic varied structural composite yarn via cyclical changing of the spacing between filaments and the strand

Gradient colored yarns are manufactured by controlling the blending ratios of three-primary-colored fibers in a slight distribution of gradients along the yarn length, thereby resulting in a continuous natural variation in mixed colors of the fibers throughout the whole yarn. The spinning of gradient colored yarns still remains a challenge, which requires the reliance on digital blending theory of colored fibers and the supporting of multi-channel computer numerical control (CNC) spinning technique. This paper constructed a three-primary-colored fiber gridded color mixing model and its mass mixing matrix and color mixing chromatography matrix by mass discretization and coupling pairing with a 10% gradient for the three-primary-colored fibers. With the aim of continuous natural gradient of mixed colors, the blending ratio gradient path of three-primary-colored fibers was planned based on the mass mixing matrix, and a method of regulating the gradient of color difference between adjacent color segments was proposed. In order to realize the natural gradient of color of the forming yarn, the spinning mechanism of gradient colored yarn was established based on three-channel CNC spinning mechanism and the time-series yarn simulation model, and the time-series spinning processing parameters of three-channel CNC spinning machine were devised. Four gradient colored yarns with different gradient paths were designed and prepared, the linear density, twist, unevenness, surface hairiness, and tensile strength of the spun yarns were measured, compared, and analyzed, and knitted fabrics with color gradient effect were fabricated by small circular knitting machine to obtain continuous and natural color transition with a dreamy and mysterious color effect.

Section: Performance Testing and Characterization Of Gradient Colored Yarnsmentioning

confidence: 99%

Section: Comparison Of Surface Hairiness Of Different Gradient Colored Yarnsmentioning

confidence: 99%

Serialized gradient chromatography for the digital blending of colored fibers and spinning of gradient colored yarn

Sun

Cui

et al. 2021

“…Instead of the eccentric device used in a previous study, 13 an electric device (Figure 3) was installed on a experimental HFX-A6 type ring frame to force filaments (guided by traversing godet wheels) to perform migrations during their inputting into the front roller nip (Figure 4), causing periodic changes in the filaments' position in the composite sirospun triangle. The migration frequency (or speed) of the godet wheels was set at 80 times/min to produce a novel composite sirospun yarn.…”

Section: Experimental Detailmentioning

confidence: 99%

“…12 This study is different from a previous study, which focuses on cyclic structural changed yarn using one multifilament and a single staple strand. 13 In particular, the influence of filament migration between siro strands on yarn structure and properties is theoretically analyzed and predicted for the novel composite siro-spinning. A verified experiment is then conducted to produce novel composite sirospun, corefil sirospun, and siro corespun yarns on a ring frame.…”

mentioning

confidence: 99%

Novel composite siro-spinning with forced migrations of filaments

Xia

Wang

et al. 2019

Self Cite

In this study, a novel composite siro-spinning method with cyclically migrating filaments was developed as a simple and safe way to enhance filament-staple-fiber coherence. The novel composite siro-spinning method was theoretically demonstrated to produce a yarn with migrated filaments clasping both internal and external fibers. It was predicted that migrated filaments of the novel composite sirospun yarn were not straight enough to resist yarn tensile drawing as the filament parallelism with the yarn axis decreased. However, migrated filaments could clasp the staple fibers firmly to enhance filament-staple-fiber coherence, contributing an excellent frictional resistance of the novel composite yarn. Experiments were then conducted to validate the demonstration. Experimental results proved that the novel composite sirospun yarn had cyclic filament immersion and exposure appearance, resulting in medium hairiness and yarn imperfection after comparison with corefil sirospun and siro corefil yarns. The novel composite sirospun yarn with severe filament migrations had poor filament straightness, but filament deformations that were effective in clamping staple fibers. Therefore, the novel composite sirospun yarn had less strength, but greater frictional resistance than corefil sirospun and siro corefil yarns.

“…A previous study reported that a strong composite yarn can be achieved when filaments are parallel with the yarn stem. 27 Therefore, a conventional corefil yarn with two buried F1 and F2 filaments is predicted to have the maximum strength. Disappointingly, excessive hairiness of corefil yarns is supposed to result in poor anti-friction.…”

Section: Property Prediction Of Different Structured Composite Yarnsmentioning

confidence: 99%

A method to produce ring single yarn with fancy and anti-frictional structure by feeding filaments in front of the front roller nip

Xia

Wang

2019

Self Cite

In this study, a composite ring spinning via feeding filaments in front of the front roller nip method was developed as a novel, effective way to form yarn surface looped fancy wrappings. The novel method was theoretically demonstrated to produce fil-wrap yarn with tight filament wrappings and periodic filament loop decorations on the surface. Tight filament wrappings fasten staple fibers firmly onto the yarn stem to achieve excellent anti-friction, while filament loops decorate the yarn surface to yield a fancy appearance. However, intensive bending of looped and wrapping filaments are likely sheared down to decrease the yarn’s tensile strength. The novel method was combined with corefil spinning to produce a fil-clamp yarn with enhanced structural fastness and strength. Experiments were conducted to validate the approach. Experimental results proved that the novel fil-wrap and fil-clamp yarns had periodic filament looped and tight wrappings, resulting in eliminated hairiness and increased fancy loops after comparison with conventional sirofil and corefil yarns. respectively. The fil-wrap yarn with only surface-bending filament wrappings was weaker, but more friction-resistant than conventional sirofil and corefil yarns. Yarn strength and anti-friction were enhanced after burying straight filaments in the fil-wrap yarn body to form a fil-clamp yarn. The fil-clamp yarn with fancy and anti-frictional structure is expected to endow fabrics with improved fluffiness, softness and anti-frictional properties.