3. SOUTHEAST UNIVERSITY
Department of textile Engineering
05/22/14 Analysis of fabric faults & its remedies 3
Introduction
Objectives of the project:
To know about knit fabric faults.
To learn the knitting process
To know about how to reduce knit fabric faults.
To know about how to improve the quality of knit fabric.
4. SOUTHEAST UNIVERSITY
Department of textile Engineering
05/22/14 Analysis of fabric faults & its remedies 4
What isfabric defect?
What isfault freefabric ?
5. SOUTHEAST UNIVERSITY
Department of textile Engineering
05/22/14 Analysis of fabric faults & its remedies 5
Factors that lead to fabric defects
A. Material-Related Factors
Fiber contaminants
Excessive neps and seedcoat fragments
Excessive short fiber content
Excessive trash content
High variability between and within-mix
Clusters of unfavourable fiber characteristics
Weight variation
Twist variation
Excessive Hairiness
6. SOUTHEAST UNIVERSITY
Department of textile Engineering
05/22/14 Analysis of fabric faults & its remedies 6
Factors that lead to fabric defects (contd.)
B. Machine-Related Factors:
Failureof spinning preparation to eliminateor minimizeshort and long-term
variation
Failureof themixing machinery to provideahomogenousblend
Excessivemachinestopsparticularly during spinning
Excessiveendspiecing during spinning preparation
Poor maintenanceand housekeeping
Knitting-related defects
Dyeing and Finishing-related defects
21. SOUTHEAST UNIVERSITY
Department of textile Engineering
05/22/14 Analysis of fabric faults & its remedies 21
Fabric press off
Fabric pressoff appear, asabig small holein thefabric, caused dueto theinterruption of the
loop forming process, asaresult of theyarn breakage, or closed needlehooks. Pressoff takes
place, when theyarn feeding to both theshort butt & long butt needles, suddenly stops, due
to theyarn breakage.
Causes:
End breakageon feeders, with all needlesknitting.
Yarn feeder remaining in lifted up position, dueto which theyarn doesn’t get fed in the
hooksof theneedles.
Remedies:
Needledetectors, should beset precisely, to detect theclosed needles& prevent thefabric
tubeform completely pressing off.
Proper yarn tension should bemaintained, on all thefeeders.
