C. Prakash

A study of the thermal properties of single jersey fabrics of cotton, bamboo and cotton/bamboo blended-yarn vis-a-vis bamboo fibre presence and yarn count

In this study, the thermal properties of 100% cotton, 50/50 cotton/bamboo and 100% bamboo single jersey fabrics with differing yarn linear density are evaluated and analysed. The linear densities of the yarns composing the fabrics are 20s, 25s, 30s Nec and the twist level in the yarns is kept the same. An increasing the presence of bamboo fibre in the fabric causes a reduction in fabric thickness and GSM for all linear densities of yarn. Air permeability and water-vapour permeability also increase with increase in bamboo fibre content while both thermal conductivity and thermal resistance show a decreasing trend. As the constituent yarn gets finer, fabric air and water-vapour permeability both increase in value while the thermal conductivity falls.

Effect of blend proportion on thermal behaviour of bamboo knitted fabrics

This study presents the thermal comfort properties of single jersey knitted fabric structures made from cotton, regenerated bamboo and cotton–bamboo blended yarns. Cotton, bamboo fibre and blends of the two fibres (100% cotton, 100% bamboo, 50:50 cotton:bamboo, 67:33 cotton:bamboo, 33:67 cotton:bamboo) were spun into yarns of identical linear density (20 tex). Each of the yarns so produced was converted to single jersey knitted fabrics with loose, medium and tight structures. The thermal conductivity of the fabrics was generally found to decrease with increase in the proportion of bamboo fibre. The relative water vapour permeability and air permeability of the fabrics were observed to increase with increase in bamboo fibre content. Statistical analysis also indicates that the results are significant for air permeability, thermal resistance, thermal conductivity and relative water vapour permeability of the fabrics.

Effect of blend proportion on moisture management characteristics of bamboo/cotton knitted fabrics

This study reports an investigation of the effect of the blend-ratio of bamboo and cotton fibres on the moisture management properties of single jersey knitted fabrics composed of them. The moisture management properties of the fabrics were measured in SDL-ATLAS moisture management tester. The liquid transport properties of textiles, such as wetting time, maximum moisture absorption rate, maximum wetted radii, spreading speeds, cumulative one-way transport capacity and overall moisture management capacity (OMMC), have been considered and correlated to the blend ratio of bamboo/cotton yarn single jersey knitted fabrics. It was observed that as the bamboo content increased, the wetting time decreased, maximum wetted radius decreased, rate of absorption increased, spreading speed decreased and OMMC decreased.

Thermal comfort properties of bamboo tencel knitted fabrics

– The purpose of this paper is to present the thermal comfort properties of single jersey knitted fabric structures made from bamboo, tencel and bamboo-tencel blended yarns. , – Bamboo, tencel fibre and blends of the two fibres were spun into yarns of identical linear density (30s Ne). Each of the blended yarns so produced was converted to single jersey knitted fabrics with loose, medium and tight structures. , – An increase in tencel fibre in the fabric had led to a reduction in fabric thickness and GSM. Air permeability and water-vapour permeability also increased with increase in tencel fibre content. The anticipated increase in air permeability and relative water vapour permeability with increase in stitch length was observed. The thermal conductivity of the fabrics was generally found to increase with increase in the proportion of bamboo. , – It is clear from the foregoing that, although a considerable amount of work has been done on bamboo blends and their properties, still there are many gaps existing in the literature, in particular, on thermal comfort, moisture management and spreading characteristics. Thus the manuscript addresses these issues and provides valuable information on the comfort characteristics of the blended fabrics for the first time. In the evolution of this manuscript, it became apparent that a considerable amount of work was needed to fill up the gaps existing in the literature and hence this work which deals with an investigation of the blend yarn properties and comfort properties of knitted fabrics was taken up. , – This research work is focused on the thermal comfort parameters of knitted fabrics made from 100 per cent tencel yarn, 100 per cent bamboo yarn and tencel/bamboo blended yarns of different blend ratios.

A study on thermal properties of single-jersey knitted fabrics produced from ring and compact folded yarns

This paper presents a study on the thermal properties of single-jersey knitted fabrics manufactured using ring, compact and ring/compact folded yarns. The variations in thermal properties depending on the yarn twist and traveller weight of folded yarn single-jersey knits were discussed. It was found that the thermal resistance of knitted fabrics generally increases as the traveller weight decreases, and also water vapour permeability reduces as the traveller weight decreases. The water vapour permeability and air permeability of knitted fabrics increase as the twist increases. The thermal conductivity of knitted fabrics decreases as the twist increases. The air permeability and water vapour permeability values were higher for compact folded yarn fabrics as compared to those values of ring and ring/compact folded yarn fabrics. It is observed that yarn twist and traveller weight have affected different thermal properties of single-jersey folded yarn fabrics.

Comfort properties of bamboo/cotton blended knitted fabrics produced from rotor spun yarns

The comfort characteristics of bamboo/cotton-blended knitted fabrics made from rotor-spun yarns were studied in this research work. Five different blend proportions namely 100% bamboo, 100% cotton, 50:50 cotton:bamboo, 70:30 cotton:bamboo and 30:70 cotton:bamboo were used to produce rotor-spun yarns of 30sNec. The yarn samples developed out of these different blend proportions were evaluated for yarn strength and elongation, yarn unevenness, yarn imperfections and used to produce single-jersey-knitted fabrics. All the fabric samples were dyed and finished. Fabric samples were evaluated for geometrical properties such as course/inch, wales/inch, stitch density and thickness apart from measuring comfort properties such as airpermeability, thermal conductivity, thermal resistance and water vapour permeability. The results indicated that 50/50 bamboo/cotton-blended knits have comparable fabric quality in terms of comfort properties with respect to 100% bamboo fabrics.

Moisture Management Properties of Bamboo Viscose/Tencel Single Jersey Knitted Fabrics

ABSTRACT Effect of bamboo viscose/tencel blend ratio on the moisture management properties of single jersey knitted fabrics has been studied. Moisture management properties, such as wetting time of top and bottom fabric surfaces, maximum moisture absorption rates of top and bottom surfaces, maximum wetted radii of top and bottom surfaces, spreading speeds of top and bottom surfaces, and cumulative one-way transport capacity and overall moisture management capacity have been considered and correlated to the blend ratio of bamboo viscose/tencel yarn single jersey knitted fabrics. It is observed that as the tencel content increases, the wetting time, absorption rate, spreading speed, overall moisture management capacity decreases but maximum wetted radius increases.

Influence of blend ratio and linear density on liquid spreading characteristics of bamboo/ cotton-blended yarn knitted fabrics measured by liquid spread tester

In this study, a new liquid spread tester, designed and developed in an earlier work by the authors, has been used for the study and analysis of the transverse wicking characteristics of single jersey-knitted fabric produced from bamboo/cotton-blended yarn. The most significant liquid spreading characteristic, namely the liquid spreading rate, has been measured and analysed for two sets of the knitted fabric composed of bamboo/cotton yarn, one of linear density Ne 20s and the other of Ne 40s yarn. The yarn blend composition was varied in a similar manner for both sets of fabric. It was observed that liquid spreading rate decreased with increase in bamboo content for all the blend proportions investigated. It was also found that this property is higher in the wale-way direction than the course-way direction.

Investigation of Relationship Between Blend Ratio and Yarn Twist on Yarn Properties of Bamboo, Cotton, Polyester, and its Blends

ABSTRACT In this study, a series of blended yarns consisting of 80:20 bamboo/cotton, 67:33 bamboo/cotton, 50:50 bamboo/cotton, 33:67 bamboo/cotton, 20:80 bamboo/cotton, 80:20 bamboo/polyester, 67:33 bamboo/polyester, 50:50 bamboo/polyester, 33:67 bamboo/polyester, and 20:80 bamboo/polyester were produced from blends consisting of bamboo/cotton and bamboo/polyester. Besides these, 100% bamboo, 100% cotton, and 100% polyester were also produced. All the yarns were produced with two levels of twist per meter (TPM) 76 and 90. It can be found that the yarn unevenness characteristic was affected by the blended ratio of cotton, polyester, and regenerated bamboo fiber. The drop in tenacity of blended yarns in comparison to the constituents is generally lower which is attributed to the elongation at break of the yarns. The variability in tenacity in respect of 100% polyester yarn is quite high in comparison with other yarns. The yarn elongation at break of bamboo/cotton-blended yarns is found to be lower than those of bamboo/polyester-blended yarns. The variability in the work of rupture is found to be lower for bamboo/cotton-blended yarns. Yarn friction values of the yarns noticed that polyester exhibits the highest value at the TPM of 76. The yarn torque values from which it is noticed that 100% polyester yarns spun with the TPM of 76 have a higher torque in both the wet and dry states. The quality characters of yarn depend upon the ratio of bamboo, cotton, and polyester in the blend ratio.

EVALUATION OF ANTIBACTERIAL EFFICACY AND WOUND HEALING ACTIVITY OF NATURAL FIBRE BASED WOUND DRESSING COATED WITH NATURAL EXTRACTS OF CALOTROPIS GIGANTEAN, EUCALYPTUS GLOBULES AND BUDS OF SYZYGIUM AROMATICUM ENHANCED WITH EPIDERMAL GROWTH FACTOR

In this work, the leave extracts of Calotropis gigantean, Eucalyptus globules and buds of Syzygium aromaticum were prepared and coated on natural fibres based bamboo gauze fabric for wound dressing applications. The fabrics coated with different compositions of the natural extract were enhanced with rhEGF (REGEN-DTM 60). The antibacterial activity of the developed samples was studied after the identification of its mechanical properties and Scanning Electron Microscopy. The wound healing efficacy of the coated fabric samples were studied through In vivo method using Wister Albino rats. The type of wound selected for the study was second degree burn wound. The dorsal surface of the rat’s skin was removed and second degree burn wound was created. Then the developed fabric samples were dressed over the wound surface and the wound healing was studied by wound closure rate in equal interval of days. A specified composition of natural extracts coated on bamboo gauze fabric enhanced with rhEGF (REGEN-DTM 60) exhibits good antibacterial property was confirmed from the formation of zone of inhibition in antibacterial test against Gramnegative (Escherichia coli) and a Gram-positive bacterium (Staphylococcus aureus) and appropriate wound closure rate on second degree burn wound through In vivo evaluation. Hence therefore it was concluded that coated bamboo gauze fabrics can be suitable for faster burn wound healing process.