fabric faults and its remedies
TRANSCRIPT
SOUTHEAST UNIVERSITYDepartment of textile Engineering
04/11/23 Analysis of fabric faults & its remedies 1
Name : MAZADUL HASAN SHESHIRID: 2010000400008Batch: 13th Batch (Session 2009-2013)Department: Wet Processing Technology Email: [email protected]: www. Textilelab.blogspot.com Southeast UniversityDepartment of Textile Engineering
PREPARED BY ©right
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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.
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What is fabric defect?
What is fault free fabric ?
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Factors that lead to fabric defectsA. 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
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Factors that lead to fabric defects (contd.)B. Machine-Related Factors:
Failure of spinning preparation to eliminate or minimize short
and long-term variation
Failure of the mixing machinery to provide a homogenous
blend
Excessive machine stops particularly during spinning
Excessive ends piecing during spinning preparation
Poor maintenance and housekeeping
Knitting-related defects
Dyeing and Finishing-related defects
SOUTHEAST UNIVERSITYDepartment of textile Engineering
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Drop stitches (holes) Barriness Streakiness Imperfections Snarls ContaminationsSpirality FlyBroken needlesSinker lines
Oil Lines Broken endsFabric press offNeedle linesCloth fall- outGrease stainPin holeRust stainOil stainStar Mark
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Fabric press off
Fabric press off appear, as a big small hole in the fabric, caused due to the interruption of the loop forming process, as a result of the yarn breakage, or closed needle hooks. Press off takes place, when the yarn feeding to both the short butt & long butt needles, suddenly stops, due to the yarn breakage.Causes:End breakage on feeders, with all needles knitting.Yarn feeder remaining in lifted up position, due to which the yarn doesn’t get fed in the hooks of the needles.Remedies:Needle detectors, should be set precisely, to detect the closed needles & prevent the fabric tube form completely pressing off.Proper yarn tension should be maintained, on all the feeders.
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GRADING
0-19 points A- grade
20-29 points B- grade
30 points & above C-grade
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