Dyeing faults and Remedies 2

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 2.  Fabric width Variation:-

Definition:

·       Different rolls of the same fabric lot, having difference in the finished width of the fabric.

Causes:-

·       Grey fabric of the same lot, knitted on different makes of knitting machines, having varying number of Needles in the cylinder.

·       Roll to roll difference, in the dyed fabric stretched width, while feeding the fabric on the stenter, compactor or calendar.

 

·       9The whole lot of grey fabric should be knitted on the same make of knitting machines.

·       For same gauge & diameter of the knitting machines, there can be a difference as high as 40 needles  from one make to other make of the machine, these difference of up to 2”-3” Finished DIA( + or –) of the fabrics.

·       During stenter&finishing, the stretched width of the fabrics should be remaining constant.

3. Stains:

Definition:-

·       Stains appear as a spots or patches, of grease, oil or dyes of different color, in a neat & clean finished fabric’s surface. It is a common defect.

Causes:-

·       Dyeing machine do not cleaned thoroughly, after dyeing a lot.

·       Grease, oil & rust stains from unguarded moving machine’s parts like; Gears, Shafts, Driving pulls& Trolley wheels, and irons plates.

·       During transportation, fabric touched in the floor or soiled/dirty places.

·       Handling of the fabric, with dirty hands or stepping into the stored fabric with dirty feet or shoes on.

Remedies:

·       After dyeing the machine should be wash & clean properly.

·       Follow the dyeing cycle of LIGHT-MEDIUM- DARK shades & then reverse the cycle, while dyeing the fabrics.

·       All the lubricated machine parts should be protected, with safety guards.

·       Make sure that the fabrics is neatly packed or covered by clean polythene, while storeing.

·       Handle the fabric with carefully, with clean hands, do not step on the fabric.

4.  High Shrinkage:

 Definition:-

·       The original intended measurements of the garments go , haywire, during storage or after a very first wash.

Causes:-

·       High stresses & strains exerted on the fabric, during knitting, dyeing & processing and the fabric not being allowed to relax properly.

·       High shrinkage is primarily due to the high tension, during knitting, dyeing and the finishing processes.

Remedies:

·       Keep the grey fabric in loose plated form, immediately after the roll cut.

·       Store the finished fabric also in the plated form not roll form.

·       Before cut the fabric must be relax properly.

·       Give maximum overfeed to the fabric, during processing, on the Stenter, Compactor the Calendaring machines.

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