• Textile Coloration and Finishing
• /
• v.2 no.3
• /
• pp.1-7
• /
• 1990

The crystallinity and dyeability of PET filament were studied when the conditions of drawing and heat-setting were varied. The crystaltinity of PET filament was increased as the drawing ratio and heatsetting temperature were increased. The dye uptake and dyeing rate of PET filament were decreased as the drawing ratio was increased. With increasing the heat-setting temperature, however, the dye uptake and dyeing rate were decreased at an early stage, showing the minimum at $160^{\circ}C-180^{\circ}C$ and then increased above that temperature. The thermal shrinkage of PET filament was decreased as the drawing ratio was increased, while increasing as the heat-setting temperature was increased.

• Fashion & Textile Research Journal
• /
• v.16 no.2
• /
• pp.326-332
• /
• 2014

To develop cool touch feeling fabrics for summer clothing material, it was manufactured several compositions of woven fabrics, having rayon multi-filament yarn (non-twisted) as warp and various kinds of yarn, such as viscose rayon multi-filament yarn (twisted), tencel$^{(R)}$ spun yarn, PET high absorbance quick dry filament yarn, and PET based rayon-like yarn, as weft. After preparing the fabrics, basic properties of the fabrics were investigated, such as air-permeability, tensile strength, absorption rate, drying rate, etc. Also, surface warm / cool sensations of the woven fabrics were assessed by Qmax Warm / Cool Touch Tester. It was observed that the fabrics composed of viscose rayon multi-filament yarn (warp) and PET high absorbance quick dry filament yarn (weft) showed excellent surface cool touch sensation-the highest Qmax value. This is because the fabric having flat shaped PET high absorbance quick dry filament shows the largest contact area with Qmax measuring plate. And, the fabric also showed superior high absorbance and quick dry property as expected. In addition, we treated phase change material (PCM) on the surface of the fabric composed of viscose rayon multi-filament yarn (warp) and PET high absorbance quick dry filament yarn(weft) to improve the cool touch feeling. However, the surface cool touch feeling was impaired by resin treated with PCM during the finishing process.

• Textile Coloration and Finishing
• /
• v.29 no.3
• /
• pp.148-154
• /
• 2017

Many researches have been made on the processing technology of Poly(ethylene terephthalate) (PET), which is widely used for clothing and non-clothing applications. In this study, we coated PET filaments with m-aramid resin to improve heat resistance and antimicrobial properties. In order to enhance adhesion between PET and m-aramid polymer, the adhesive polymer was coated on the PET filaments using a winding speed of 100m/min and then treated with m-aramid. Scanning electron microscopy was used to analyze the surface of the adhesive polymer and m-aramid treated PET filament. The change of initial degradation temperature according to treatment was confirmed by thermogravimetric analysis. Antimicrobial activity analysis using bacterial reduction method showed that PET filament treated with adhesive polymer and m-aramid had an increased antibacterial effect compared to untreated PET filament.

• Textile Coloration and Finishing
• /
• v.7 no.1
• /
• pp.1-9
• /
• 1995

In order to improve dyeability of poly(ethylene terephthalate)(PET) micro filament fabrics, the effect of the prior oxygen low temperature plasma on the subsequent dyeing(deep dyeing, printing) was examined in various conditions. The apparent concentration of dyed PET micro filament fabrics was increased by $O_{2}$plasma treatment. Higher discharge power levels and higher reactor pressure values created more significant effect. The wettability was significantly increased by $O_{2}$ plasma treatment. Therefore, it is predicted that introducing hydrophilic group on the surface of material can improve the apparent concentration of PET micro filament fabrics.

• Textile Coloration and Finishing
• /
• v.8 no.6
• /
• pp.33-39
• /
• 1996

The purpose of this study was to investigate the structural characteristics, mechanical properties, and stress-relaxation behavior of PET filament, which were prepared at various spinning speeds(1650, 3300, 4500, 5000, 5500, and 6000 m/min) and anneal(12$0^{\circ}C$, 20 min & 15$0^{\circ}C$, 40 min). In 4500 m/min of spinning speed the crystallinity, crystallite size, and degree of orientation of PET filament rapidly increased. By increasing spinning speed, the temperature dependence of stress-relaxation sharply decreased. Same results were obtained from heat-treated samples. As a result, activation energy for stress-relaxation increased with the crystallinity and spinning speed.

• Textile Coloration and Finishing
• /
• v.26 no.2
• /
• pp.114-123
• /
• 2014

This research investigated the physical properties of PET coolness filaments and their knitted fabrics including dyeing characteristics of these knitted fabrics according to the different dyeing time and temperature. The coolness filament(S) with non-circular cross-section and hydrophilic property was spun and another commercialized coolness(A) and regular(R) PET filaments were prepared for comparing coolness and another physical properties. Qmax of coolness knitted fabric made with S filament was higher than that of R-PET filament, and the maximum value of Qmax of S knitted fabric was shown at the dyeing conditions of temperature, $110^{\circ}C$ with 30 min. or 40min. It was shown that hand of S knitted fabric was a little harsh comparing to A and regular knit specimens, but shape retention and wearing performance of garment made with S knit specimen were estimated as good owing to high bending and shear rigidity. K/S of S knitted fabric was higher than those of regular PET and A knit specimens. Dyeing fastness of coolness knitted fabric showed between 4th and 5th grade.

• Textile Coloration and Finishing
• /
• v.10 no.2
• /
• pp.45-54
• /
• 1998

This study surveys relation between thermal shrinkage and thermal stress properties after process simulation of heat treatment with various PET filament yarns. For this purpose, 12 kinds of regular yarns and POY, 6 kinds of DTY and 5 kinds of composite yarns were experimented for investigating step thermal shrinkage, total thermal shrinkage and total thermal stress and maximum thermal stress temperature. Thermal stress and shrinkage of the various specimens treated with wet and dry heats were analysed and discussed with the conditions of heat treatment. finally, relationship between thermal stress and shrinkage of the various PET filaments such as regular yarns, POY, DTY and composite yarns were investigated with the PET filament characteristics.

• Science of Emotion and Sensibility
• /
• v.5 no.3
• /
• pp.61-66
• /
• 2002

Recently PET fabrics woven by high sensitive PET yams were used as a high sensitive clothing. Such high sensitive PET woven fabrics for clothing are passing through various processes, and are influenced by processing tension and heat, it makes the physical properties of PET yarns changing and makes the defects of PET fabric. Therefore many difficulties are faced to decide processing conditions for making high sensitive PET fabric. But few research related to the processing conditions of PET yarns and issue point for producing high sensitive clothing was only performed. In this study, POY and SDY of PET manufactured in seven filament manufacturing companies are selected, and their physical properties in each layers of filament cake divided by 50000m are measured and analyzed. Especially, wet and dry shrinkages according to the various wet and dry heat temperatures are analyzed for supplying basic physical data of PET yam and for enhancing PET yarn quality used for the high sensitive clothing.

• Bulletin of the Korean Chemical Society
• /
• v.12 no.5
• /
• pp.468-473
• /
• 1991

Viscoelastic properties of PET filament fibers on stress relaxation were investigated in the solvents of $H_2$O, 0.05% NaOH and 50% DMF using an Instron (UTM4-100 Tensilon) with solvent chamber. The theoretical stress relaxation equation derived by applying the Ree-Eyring's hyperbolic sine law to dashpot of three element non-Newtonian model was applied to the experimental stress relaxation curves, and the model parameters $G_1,G_2$, ${\alpha}$ and ${\beta}$ were obtained. By analyzing temperature dependency of the relaxation time, the values of activation entropy, activation enthalpy and activation free energy for flow in PET filament fiber were evaluated, the activation free energy being about 25.7 kcal/mol. The self diffusion coefficient and hole distance were obtained from parameters ${\alpha}$, ${\beta}$ and crystallite size in order to study the self diffusion and the orientation of crystallites in amorphous region and the effect of solvent.

• Textile Coloration and Finishing
• /
• v.24 no.1
• /
• pp.45-53
• /
• 2012

In order to make a supermicrofiber fabric with PET/co-PET sea-island type filament fiber, the optimum conditions of dissolution of co-PET composite filament fiber was examined. The data set was made at various organic acid concentration and steam temperature with treated time as a main variable. At the same time, the microstructure changes by organic acid treatment of sea-island type PET supermicrofibers were monitored by thermal analysis morphology, DSC thermgrams and SEM images. Weight reduction behavior of supermicrofibers by caustic treatment was investigated in a comparative method. The termination of dissolution was also confirmed using DSC thermgrams and SEM images.