Fabric faults and its remedies

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

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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.



What is fabric defect?

What is fault free fabric ?



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



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





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



























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.

















GRADING

0-19 points A- grade

20-29 points B- grade

30 points & above C-grade







