Comparative analysis of 100% cotton Siro and single yarns

The aim of this work is to carry out the comparative study to analyse the properties of Siro and single yarn with different linear densities. For this purpose Siro yarn and single yarn with the same linear densities were produced from cotton. Tensile strength and related properties such as evenness, imperfections and hairiness have very important role in weaving. In this comparative study Siro and single yarn with linear densities of 10 Nec, 14 Nec and 18 Nec were manufactured, tested and analysed. Two rovings were used for Siro and one roving was used for single yarn. Comparative study revealed that Siro yarn exhibit better tensile strength and related properties

Production of Fine Count Yarns from Some Extra-long Egyptian Cottons on Different Spinning Systems

The current research was carried out to produce fine count yarns from extra-long Egyptian cotton varieties using compact and ring spinning systems.in addition, to compare between compact yarns and ring yarns in terms of their physical and mechanical properties. Three commercial extra-long staple Egyptian cottons Giza92, Giza93 and Giza 96 were used to produce four linear densities of 80, 100, 120 and 140 at 3.6 twist multiplier. Results obtained showed that Giza 92 was surpassed significantly other extra -long staple varieties. It recorded the highest mean values of yarn strength and yarn evenness While, the same variety recorded the lowest mean values of yarn hairiness and imperfections. Compact yarns were much better than yarns spun on the ring spinning in yarn strength, yarn elongation, evenness, yarn imperfections and yarn hairiness. Yarn count 80,s gave higher single yarn strength (20.89cN/tex), yarn elongation (5.03%) and yarn evenness (17.49%) and lower yarn hairiness (2.04) and imperfections than yarn count 140s. Single yarn strength, yarn elongation and yarn evenness were decreased with increasing yarn count. While the number of neps, hairiness, the number of thin and thick places were increased with increasing yarn count. Concerning, the effect of interaction between cotton varieties × yarn counts × spinning systems on yarn quality properties. Yarn count 80s recorded the highest mean values of yarn strength (23.14, 21.1 and 20.2 cN/tex) and yarn evenness (17.72, 16.53 and 16.79%) for varieties Giza92, Giza93 and Giza96, respectively for compact spinning system. Yarn strength at count 80, 100, 120 and 140 correlated negatively and highly significant with micronaire value and maturity ratio.

Surface Modification of Flax Yarns by Enzymatic Treatment and Their Interfacial Adhesion with Thermoset Matrices

The aim of this study was to assess the effects of commercially available and relatively inexpensive enzyme preparations based on endo 1,4-β-xylanase, pectinase and xyloglucanase on the thermal (TGA), morphological (SEM), chemical (FT-IR) and mechanical (single yarn tensile tests) properties of flax yarns. The preparation based on pectinase and xyloglucanase provided the best results, resulting in the effective removal of hydrophilic components such as hemicellulose and pectin, the individualization of yarns and increased thermal stability at the expense of a reduction in mechanical properties, depending on the treatment parameters. Single yarn fragmentation tests pointed out an improved interfacial adhesion after enzymatic treatment, with reduced debonding length values of 18% for an epoxy matrix and up to 36% for a vinylester resin compared to untreated flax yarns.

Environmentally Friendly Surface Modification Treatment of Flax Fibers by Supercritical Carbon Dioxide

The present work investigates the effects of an environmentally friendly treatment based on supercritical carbon dioxide (scCO2) on the interfacial adhesion of flax fibers with thermoset matrices. In particular, the influence of this green treatment on the mechanical (by single yarn tensile test), thermal (by TGA), and chemical (by FT-IR) properties of commercially available flax yarns was preliminary addressed. Results showed that scCO2 can significantly modify the biochemical composition of flax fibers, by selectively removing lignin and hemicellulose, without altering their thermal stability and, most importantly, their mechanical properties. Single yarn fragmentation test results highlighted an increased interfacial adhesion after scCO2 treatment, especially for the vinylester matrix, in terms of reduced debonding and critical fragment length values compared to the untreated yarns by 18.9% and 15.1%, respectively. The treatment was less effective for epoxy matrix, for which debonding and critical fragment length values were reduced to a lesser extent, by 3.4% and 3.7%, respectively.

H2-gas sensing and discriminating actions of a single-yarn sensor based on a Pd/GO multilayered thin film using FFT

A single-yarn H2-gas sensor was fabricated by self-assembling Pd/GO/PAH/PSS/PAH/yarn multilayer thin film in situ self-assembled on a single-yarn.

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

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.

Multisection color-blended wool yarn produced by a new three-channel spinning method

By dynamically controlling the feeding amount and feeding ratio of the three feeding rollers with program logical control system under the requirements of yarn spinning parameters, it is possible to effectively configure the final yarn density and the blending ratio of three components to produce multisegment gradient yarns, segment-color yarn, and segment-color slub yarn named as multisegment blending yarns. The yarn-spinning new method was proposed. Different kinds of fancy yarns including gradient yarns, segment color yarns, and slub yarns were produced. The fiber blending effects were demonstrated by slices of yarn cross section, and the surface morphology of yarns were figured out by the photo of yarns. Integrally knitting seamless sweater and different type of pattern were designed and knitted by multisegment blending yarns. The free change of colors along the length direction on a single yarn provides an effective method for integrated rapid design and production of sweaters through mutual design of the overall pattern and the structure of the fabric.