Investigation of deformation properties of textured multifilament PES yarns

Abstract

In the process of texturing, smooth filaments are formed into crimpy yarns. By combining thermal and mechanical action, thermoplastic fibres acquire a permanent wavy shape. Since textured multifilament yarns, formed from POY PES filaments, produced on machines with high-temperature heaters, are insufficiently studied, this paper analyses the deformation characteristics of yarns produced in industrial conditions using different process parameters (primary heater temperature, yarn speed, yarn stretching, peripheral speed of friction discs). Special attention is paid to the characteristics at the elastic limit, then at the creep limit, yield and breaking of multifilament textured yarns. A method is proposed which can determine the key points of deformation in the process of stretching textured polyester multifilament yarn, as well as the relationship between the values of force and elongation at the limits of elasticity, creep, end of creep zone, yield and break

A Review on False-Twist Texturing

“…By adjusting the technological parameters of yarn texturing accordingly, energy savings in the texturing process can be achieved. This optimisation can greatly benefit the production of textured multifilament PES yarn on machines equipped with high-temperature heaters [84].…”

A Review on False-Twist Texturing

“…This optimisation can greatly benefit the production of textured multifilament PES yarn on machines equipped with high-temperature heaters. [85] Another study investigated the macromolecular arrangements in fibres and proposed a new approach for analysing the morphology of partially oriented (POY) polyethylene terephthalate (PET) yarn. They conducted various tests such as differential scanning calorimeter (DSC) analysis, Fourier transform infrared (FT-IR) analysis, boiling water shrinkage, and tensile tests.…”

Improvement of d–d interactions in density functional tight binding for transition metal ions with a ligand field model: assessment of a DFTB3+U model on nickel coordination compounds

“…All errors are calculated relative to the OPBE functional, which has been shown to be fairly accurate for spin state energetics. [79][80][81] For Ni(II) complexes, the MAE of 21.8 kcal/mol for DFTB3 is reduced to 13.8 kcal/mol for DFTB3+U with F 0 =0.035 Hartree. For Ni(III) systems, the corresponding MAE values are 17.3 kcal/mol and 9.0 kcal/mol, respectively, again supporting the value of the +U contribution.…”