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Sericin eco-friendly biomaterial as a spin finish in drawn textured PET yarn production

Abolfazl Zare (Department of Textle Engineering, Yazd University, Yazd, Iran)

Research Journal of Textile and Apparel

ISSN: 1560-6074

Article publication date: 19 January 2023




This paper aims to extracted sericin from the cocoons of Bombyx mori silkworms, and sericin powder was applied onto drawn textured polyethylene terephthalate (PET) yarns as a spin finish. The reactivity on the surface of PET yarns was analyzed through Fourier transform infrared spectrophotometry–attenuated total reflectance (FTIR-ATR) and dyeing with methylene blue as a reactive dye. Also, investigations were conducted on the effects of sericin, citrc acid (CA) (as a crosslinking agent), and sodium hypophosphite (as a catalyst) concentrations on some properties of false-twist textured PET yarns.


A false-twist texturing machine (Scragg-Shirley minibulk, England) was used with the draw ratio of 1.05, heating temperature of 120°C, texturing speed of 100 m min−1 and applied twist of 3,000 TPM. The aqueous extraction of sericin was carried out by the boiling of the raw silk in distilled water with L:R: 40:1 for 120 min. The aqueous solution was filtered with a filter paper to remove the impurities and insoluble fibroin. Finally, the sericin solution was freeze-dried to obtain the sericin powder. The sericin solution was applied on the drawn textured PET yarns using the “pad-dry-cure” method.


Sericin fixation onto the PET yarns was confirmed by FTIR-ATR. The results showed that there were no significant changes in the tensile strength, linear density, crimp contraction and crimp modulus, elongation at break and shrinkage. In contrast, a substantial increase was observed in moisture regain, vertical wicking, dye uptake and ultraviolet protection. There was also a reduction just in the electrical resistivity, in the presence of sericin.


Although sericin has been known to have numerous beneficial properties, its application in textile industry as a spin finish has not been reported yet.



Conflict of interests: The authors declare that there is no conflict of interests between this research and any other attempt in the field.


Zare, A. (2023), "Sericin eco-friendly biomaterial as a spin finish in drawn textured PET yarn production", Research Journal of Textile and Apparel, Vol. ahead-of-print No. ahead-of-print.



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