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Fiber torsional control is critical for reducing the hairiness of high-quality yarns during the yarn formation process. However, the applied fiber torsion that facilitates fiber motion and transfer in conventional ring spinning is still under exploration. In this study, we designed a device with dynamic- and static-friction rollers for reducing harmful hairiness. The key mechanisms and mechanical model of the applied forces on fiber torsion and motion contacting dynamic- and static-friction rollers were theoretically analyzed. Exceptional fiber torsion was obtained by creating gradient friction resistance from the varied applied pressures while providing full internal and external transfer to forcibly capture and trap exposed fibers into the main yarn body. Compared to conventional ring-spun yarns, yarns spun by the dynamic-friction roller exhibited reduced harmful hairiness, improved tensile properties, a tighter yarn surface, and improved yarn irregularity. However, the excessive force applied by the static-friction roller deformed exposed fibers to cause fiber accumulation and fiber loss, resulting in reduced yarn performance. These results can be used to develop novel spinning methods for various fiber materials for high-quality yarn production. [ABSTRACT FROM AUTHOR]

Solar energy is a green, sustainable, and abundant renewable resource. Adding photothermal conversion materials to phase change materials can increase the photothermal conversion efficiency and heat storage capacity of phase change materials. In this work, polyethylene glycol (PEG) was used as phase change material, zirconium carbide was used as photothermal conversion material, melamine sponge was used as the carrier, and polyurethane was used as coating to prepare phase change photothermal composites. The effects of PEG concentration and zirconium carbide concentration on the thermal properties of composite phase change materials were discussed. The results showed that when the PEG concentration was 80% and the zirconium carbide concentration was 5%, the composites showed better comprehensive properties with less leakage and high enthalpy (186.5J/g). Surface temperature of the composites could rise to 54°C in 300 s under infrared light, and the enthalpy value of phase change and the photothermal conversion capacity could maintain 97% after 50 cycles of testing. The composites could be used in various fields such as car seats, cushions, and mattresses. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Natural Fibers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Natural Fibers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Natural Fibers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

A theoretical analysis on the key mechanisms of fiber control on special-shaped condensed surfaces was conducted. The intervention of synergistic effects from narrow condensed, inclined contact, and static arc surfaces can agglomerate the strand fibers and enhance fiber transfer to control fiber motion. The losing fiber can be captured on the yarn surface to improve yarn weak links without any fiber accumulations, while local-exposed fibers can be rewrapped into the yarn body to strengthen the fiber utilization rate. Experimental results confirmed that yarn hairiness was significantly reduced by contacting special-shaped condensed surfaces in the yarn formation area. The irregularity results showed a slight deterioration after applying the special-shaped condensed surfaces, resulting from the friction between the strand and surfaces. Moreover, the tensile strength of the special-shaped condensed surface-spun yarn showed considerable improvement owing to the increased fiber utilization rate. The experimental results correspond well to the theoretical analysis. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Natural Fibers is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)