NOPR Collection:

Apron slippage in ring frame: Part III-Design and development of anti-slip apron for improved yarn quality

2003-03-01T00:00:00Z

Title: Apron slippage in ring frame: Part III-Design and development of anti-slip apron for improved yarn quality Authors: Ishtiaque, S M; Das, A; Yadav, P Abstract: The use of anti-slip apron in place of normal apron shows a total elimination of apron-to-apron slippage due to the positive means of motion transmission from bottom apron to top apron. As there is no apron-to-apron slippage in case of anti-slip apron, it can control the movement of floating fibres in a better way. Thus, the use of anti-slip aprons improves the yarn quality. Page(s): 114-116

Influence of fibre length and yarn linear density on mean fibre extent in OE DREF-II friction- spun acrylic yarns

2003-03-01T00:00:00Z

Title: Influence of fibre length and yarn linear density on mean fibre extent in OE DREF-II friction- spun acrylic yarns Authors: Dhamija, S; Sharma, V K; Salhotra, K R Abstract: The structure of OE DREF-II friction-spun yarns has been investigated mainly in terms of mean fibre extent. Fibres at the centre of these yarns are seen to extend for longer distance along the yarn axis than those at the outside. The average mean fibre extent lies within a narrow range of 15-22 mm. Within this range, depending on yarn linear density the mean fibre extent increases with the increase in fibre length up to 38 or 44 mm followed by a decrease thereafter. Page(s): 108-113

Dyeing properties of some disperse dyes on polyester microfibre fabrics

2003-03-01T00:00:00Z

Title: Dyeing properties of some disperse dyes on polyester microfibre fabrics Authors: Becerir, Behcet; Iskender, M Abdulhalik Abstract: Dyeing properties of different molecular sized disperse dyes, which are commercially used for dyeing polyester microfibre fabrics, were investigated in accordance with the changing dye concentration. The experiments were carried out in two separate steps by using a certain levelling agent. In the first step, the dyeing properties of two microfibre fabrics and a conventional polyester fabric were investigated using two disperse dyes. In the second step, the dyeing properties of different molecular sized disperse dyes were investigated by using two microfibre fabrics and nine disperse dyes. Dye uptake and colour values of different polyester microfibre fabrics were found to depend on the molecular size and concentration of the disperse dyes used for dyeing and also on the properties of the fibres and weave pattern. Increasing the dye concentration in the dyebath causes an increase in the colour value to a certain limit. Using the excess amount of dye in the dyebath does not always improve the colour values. The colour values (coordinates) can be developed to the limit of fibre saturation for dyes. The development of colour values shows different changes in different dye concentration range. Page(s): 100-107

Use of neem bark as wool colourant—Optimum conditions of wool dyeing

2003-03-01T00:00:00Z

Title: Use of neem bark as wool colourant—Optimum conditions of wool dyeing Authors: Mathur, J P; Mehta, Anjula; Kamawat, Romila; Bhandari, C S Abstract: Wool yarn has been dyed with natural colourant extracted from the bark of neem (Azadirachta indica) branch lets under the optimum conditions. Neem bark colourant shows two absorption maxima at 275 and 374 nm. Dyeing of wool yarn under the optimum conditions (pH, 4.5; colourant conc., 0.05g per gram of wool; treatment time, 60 min; and treatment temp., 97.5°C) shows very good light and wash fastness properties without deteriorating the quality of wool. The chemistry of wool dyeing process has also been discussed. Page(s): 94-99