Study on crosslinked dyed jute carpet pile yarns

477-480Jute carpet pile yarns have been treated with Indosol E-50 powder, dyes and magnesium chloride hexahydrate (MgCl₂.6H₂O) catalyst, and both treated (crosslinked dyed) and untreated yarns are used to prepare jute carpets in a mill. Several carpet parameters, such as thickness recovery, compression recovery, work of recovery, tuft withdrawal force and moisture content, of the treated carpet samples have been studied and compared with those of the untreated carpet of the same pile hight. The results show improvement in the performance characteristics of the crosslinked dyed jute carpet

Influence of yarn structure, sizing ingredients and type of sizing on properties and performance of sized yarns : Part I— Evaluation of sizing process using Zweigle G551 weavability tester

59-64The average and minimum number of abrasion strokes to failure, rate of deterioration in tensile properties when subjected to simultaneous flexion and abrasion, and the effect of cyclic extension on sized yarn strength at different size concentrations have been studied. It is observed that the number of abrasion strokes till break is higher in case of grey ring yarn than that in case of the yams sized with thin boiling starch (TBS) because the fluff generated on the surface of the grey yarn acts as a protective shield. The gain in strength after sizing is greater for rotor yarns. However, the loss in strength after a fixed number of strokes is less for rotor yarns than that for ring yarns. Though the strength of the yarns sized with TBS and PVA (both hot and cold brand) are not significantly different, the loss in strength after a fixed number of abrasion strokes is least for the cold brand PVA followed by the hot brand PVA and TBS

Influence of yarn structure, sizing ingredients and type of sizing on properties and performance of sized yarns: Part II-A comparative study of sized yarn performance<span style="font-size:14.0pt;font-family: HiddenHorzOCR;mso-hansi-font-family:"Times New Roman";mso-bidi-font-family: HiddenHorzOCR;color:#292929"> for ring- and rotor-spun cotton yarns </span>

142-148A comparative study on influence of structural differences of ring- and rotor-spun cotton yarns on the process of sizing and the performance of sized yarns against abrasion has been carried out using the 6s and 16s ring and rotor yarns sized with cold and hot brand PVA at different concentrations (9%, 7% and 5%) and drying rates (70°C and 140°C). It is observed that, in general, the abrasion resistance of rotor yarns is better than that of ring yarns. The rotor yarns give better abrasion resistance at 140°C because the higher temperature reduces size migration from inside to surface of the yarn, thereby ensuring more uniform deposition of size along the cross-section of the yarn. A better size distribution reinforces the open structure of rotor yarns and improves cohesion

Influence of yarn structure, sizing ingredients and type of sizing on properties and performance of sized yarns : Part III<b> </b>- A study of attrition during weaving for air-jet, ring and rotor yarns on a modern high speed weaving machine

149-155How best the yarns of a given spinning system can be sized with optimum cost to overcome attritive forces acting on warp yarns during weaving has been studied. Polyester/viscose (70:30) yarns (30s) obtained from the three spinning systems, viz. air-jet, ring and rotor, were sized with cold brand PVA and tested for abrasion and tensile properties. Using these yarns in warp, a plain weave fabric was woven on a Dornier Rapier loom. The yarns were then unravelled from the fabric and tested for the abrasion and tensile properties. It is observed that among the ring, rotor and air-jet yarns, the excellent abrasion resistance is obtained with air-jet yarn at higher size concentration and slow rate of drying. This is because at higher concentration there is good size film formation on the yarn surface and at slow rate of drying more outward size migration takes place, resulting in better size encapsulation. An air-jet yarn whose strength properties are derived from the tightness and compression of the surface wrappings is, therefore, protected from the abrasion forces, caused during weaving, by this size film for a longer duration

Assessing Mechanical Properties of Jute, Kenaf, and Pineapple Leaf Fiber-Reinforced Polypropylene Composites: Experiment and Modelling

The application of natural fibers is increasing rapidly in the polymer-based composites. This study investigates manufacturing and characterization of polypropylene (PP) based composites reinforced with three different natural fibers: jute, kenaf, and pineapple leaf fiber (PALF). In each case, the fiber weight percentages were varied by 30 wt.%, 35 wt.%, and 40 wt.%. Mechanical properties such as tensile, flexural, and impact strengths were determined by following the relevant standards. Fourier transform infrared (FTIR) spectroscopy was employed to identify the chemical interactions between the fiber and the PP matrix material. Tensile strength and Izod impact strength of the composites significantly increased for all the composites with different fiber contents when compared to the pure PP matrix. The tensile moduli of the composites were compared to the values obtained from two theoretical models based on the modified “rule of mixtures” method. Results from the modelling agreed well with the experimental results. Tensile strength (ranging from 43 to 58 MPa), flexural strength (ranging from 53 to 67 MPa), and impact strength (ranging from 25 to 46 kJ/m2) of the composites significantly increased for all the composites with different fiber contents when compared to the pure PP matrix having tensile strength of 36 MPa, flexural strength of 53 Mpa, and impact strength of 22 kJ/m2. Furthermore, an improvement in flexural strength but not highly significant was found for majority of the composites. Overall, PALF-PP displayed better mechanical properties among the composites due to the high tensile strength of PALF. In most of the cases, T98 (degradation temperature at 98% weight loss) of the composite samples was higher (532–544 °C) than that of 100% PP (500 °C) matrix. Fractured surfaces of the composites were observed in a scanning electron microscope (SEM) and analyses were made in terms of fiber matrix interaction. This comparison will help the researcher to select any of the natural fiber for fiber-based reinforced composites according to the requirement of the final product