Fabric faults and its remedies
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This document is a student project report from Southeast University's Department of Textile Engineering. It discusses fabric defects, their causes, and remedies. The objectives are to learn about knit fabric faults, the knitting process, and how to reduce defects and improve quality. Several types of defects are described such as drop stitches, barrenness, and imperfections. Potential causes include issues with materials, machines, and processes like knitting, dyeing and finishing. Remedies focus on machine adjustments and quality control measures.
Fabric faults and its remedies
- 1. SOUTHEAST UNIVERSITY Department of textile Engineering 05/22/14 Analysis of fabric faults & its remedies 1
- 2. Name : MAZADUL HASAN SHESHIR ID: 2010000400008 Batch: 13th Batch (Session 2009-2013) Department: Wet Processing Technology Email: mazadulhasan@yahoo.com Blog: www. Textilelab.blogspot.com Southeast University Department of Textile Engineering PREPARED BY ©right
- 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
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- 8. SOUTHEAST UNIVERSITY Department of textile Engineering 05/22/14 Analysis of fabric faults & its remedies 8 Drop stitches(holes) Barriness Streakiness Imperfections Snarls Contaminations Spirality Fly Broken needles Sinker lines Oil Lines Broken ends Fabric pressoff Needlelines Cloth fall- out Greasestain Pin hole Rust stain Oil stain Star Mark
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- 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.
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- 29. SOUTHEAST UNIVERSITY Department of textile Engineering 05/22/14 Analysis of fabric faults & its remedies 29 GRADING 0-19 points A- grade 20-29 points B- grade 30 points & above C-grade
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