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http://nopr.niscpr.res.in/handle/123456789/33081| Title: | Nep Generation with Polynosic Fibres in Relation to Surface Characteristics of Fibre |
| Authors: | Rakshit, A K Balasubramanian, N |
| Issue Date: | Dec-1983 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | A high incidence of neps during processing is frequently encountered in mills with certain lots of polynosic fibres, though measurable fibre properties are satisfactory. An attempt has been made to study the probable reasons for the higher nep generation with such fibres through a critical examination of surface characteristics of fibres using scanning electron microscope (SEM). Two polynosic fibres from different makes (types A and B), and having almost identical length, denier strength and spin finish characteristics were used. Both the fibres were spun separately from blowroom to ring frame (count 30s and 40s Ne) using identical processing sequence and parameters. Card production rate and number of draw frame passages were varied to examine their effect on nep generation. It was found that the nep level in the card and draw frame slivers is significantly higher in type A fibres than in type B fibres. Yarns from fibre A have also a signif1Cllntlyhigher level of thick places and neps than those from fibre B. SEM observations of the fibres showed a distinct difference between the surface characteristics of these two fibres. Many of the fibres in type A are encrusted at places with very large size deposits or agglomerations, while some fibres have longitudinal fissures; on the other hand, type B fibres are smooth and cylindrical and free from such extraneous deposits and defects. During carding and drafting with type A, the defective portions in the fibre may get entangled with the other fibres, resulting in neps and thick places in the yarn. Nep portion of the yarn from fibre A also showed the presence of large size deposits on the fibres under SEM, providing further support to this hypothesis. This study also shows the need for careful selection of card production rate, even with man-made fibres, for getting satisfactory carding. |
| Page(s): | 95-100 |
| ISSN: | 0975-1025 (Online); 0971-0426 (Print) |
| Appears in Collections: | IJFTR Vol.08(4) [December 1983] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJFTR 8(4) 95-100.pdf | 575.49 kB | Adobe PDF | View/Open |
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