Specialty yarns including high twisted, low twisted, untwisted, high tenacity,涡流纺, anti-twist, and bamboo yarn. Offering fine cotton (BCI), organic cotton (GOTS, OCS), recycled cotton, polyester (GRS), African cotton, Pima cotton yarns, and certificates. Hard-to-find yarns, we have in stock.

Henan QiangNian (Weixian Hesheng) Product Hotline: 13903781186, Mr. Liu

① The cross grain on the canvas is usually not visible on the white grey fabric, but appears as stripes after dyeing. Regular single yarns creating cross stripes are often caused by mis-spun yarn; regular wider stripes composed of multiple yarns creating cross stripes are generally due to fluctuations in raw material quality, mixed batches of yarns, or inconsistent tension of elastane spandex.

Upon receiving the cross-section fabric sample, first visually inspect the distribution of the stripes. Then, through methods such as fabric disassembly, instrumental testing, and chemical dissolution, comprehensively analyze the causes of the fabric's cross-section. Focus on the characteristics of color differences to further analyze factors like mixed batches, twist, yarn count, misaligned yarns, and uneven elasticity contributing to the fabric's cross-section.

③ Cut a piece of fabric of equal length from the webbing fabric surface, separate the fabric, and measure the yarn length at the webbing and normal areas under natural elongation. If there is a difference in yarn length, it may be caused by inconsistent loop size or tension.

After dismantling the fabric, the twist, yarn count, slub, and hairiness of the yarn at the cross-section were tested using spinning equipment. The differences between the yarn at the cross-section and the normal yarn were compared.

⑤ The cross-section fabric samples containing spandex elastic filaments were treated according to the FZ/T 01057.4—2007 standard. The spandex filaments in the fabric were dissolved using the "chemical dissolution method," then cleaned and dried. By examining the remaining fabric surface, which only consists of yarn fibers, we can determine if the cross-section features are consistent with the original fabric surface. If the pure yarn fabric sample shows no stripe phenomenon, it can be ruled out that the yarn itself is causing the cross-section.

Similarly, by dissolving the yarn fibers in the fabric using the "chemical dissolution method," then washing and drying it, one can examine if the transverse bar features of the remaining elastane-only fabric match those of the original fabric surface. If the pure elastane fabric surface exhibits identical bar patterns, it can be confirmed that the transverse bars are caused by the tension issue with the elastane in the knitting factory.

⑦ The fiber fineness instrument is used to examine the longitudinal and transverse cross-sections of yarns, analyzing the internal fiber structure, fiber condition, and any changes or anomalies in blending ratios. During sectioning, colored wool is used as a medium to isolate the fibers, resulting in appropriately thin sections for clearer and more discernible images.

To prepare a solution for dissolving the fibers of a spandex-cellulose blended fabric that is not soluble in the fibers' inherent spandex, follow these steps: first, pour 75mL of water into a beaker, then slowly add 25mL of 98% concentrated sulfuric acid along a glass rod, while continuously stirring to create a 40% sulfuric acid solution.

To dissolve the fiber of the spandex-cellulose blended fabric while retaining the spandex yarn, follow this method: Place the elastic fabric sample in a beaker containing 40% dilute sulfuric acid. In a water bath, heat the mixture to 95°C, stirring gently with a glass rod continuously for about 30 minutes. Discard the solution, wear rubber gloves, and clean the spandex yarn fabric sample thoroughly. Dry it and inspect the fabric surface.

Specialty yarns including strong twisted yarn, low twisted yarn, untwisted yarn, high strength yarn, vortex yarn, anti-twist yarn, and bamboo yarn. Offer high-quality cotton (BCI), organic cotton (GOTS, OCS), recycled cotton, polyester (GRS), African cotton, and Pima cotton yarns with certifications. Hard-to-find yarns, we have stock.

Henan QiangNian (Weixian Hexin) Product Hotline: 13903781186, Mr. Liu