Workshop on fabrics manufacturing technology

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Workshop on fabrics manufacturing technology

  1. 1. Workshop on Fabrics Manufacturing Technology Engineer Lutfor Rahman Shanzid M.Sc. In Environment (IUB) B.Sc. In Textile (AUST) Mobile : +88 01718 33 18 56 lutfor.shanzid@gmail.com Bangladesh
  2. 2. Contents • Definition of different terms of Textile • Weaving sequences • Weaving motions • Weaving calculation • Knitting machines • Knit products • Knitting elements • Knit structures • Knitting calculation Sunday, June 15, 2014 2
  3. 3. Definition • Textile • Fabric • Woven • Knit • Common error Sunday, June 15, 2014 3
  4. 4. FLOW CHART OF WEAVING Yarn (In the form of spinner’s package) Warp Preparation Weft Preparation Winding (cone, cheese) Winding (Cop, Pirn, Cone, Cheese) Warping (Pre beam/ Warper’s beam/ back beam) Weaving (Fabric) Sizing (weavers beam) Drafting, Drawing, Pinning Denting, Looming Weaving (Fabric) Sunday, June 15, 2014 4
  5. 5. Sunday, June 15, 2014 5
  6. 6. yarn package Cone Flange bobbin Cheese Sunday, June 15, 2014 6
  7. 7. WARPING a) Direct/ high speed warping b) Sectional warping Sunday, June 15, 2014 7
  8. 8. Sunday, June 15, 2014 8
  9. 9. Sectional warping Sunday, June 15, 2014 9
  10. 10. LOOM MOTION Primary Motion Secondary Motion Tertiary Motion Primary motion 1Shedding: (Tappet (Dobby. (Jacquard. 2Picking: (Over pick (Under pick. (Modern pick. 3Beating: (Single (Multiple (Variable. Secondary Motion 1. Take up a) Positive b) Negative. 2. Let off a) Positive b) Negative. (5 wheel, 7 wheel) Tertiary Motion 1 Warp stop motion 2 Weft stop motion (Centre, side) 3 Reed stop motion (Loose, fast) 4 Temple motion (Roller, reed) 5 Weft replenish Sunday, June 15, 2014 10
  11. 11. Knitting warp weft Sunday, June 15, 2014 11
  12. 12. • Wale: Vertical column of needle loop. • Course: Horizontal row of needle loop. Stitch Density: Wales per Inch × Course per Inch. Stitch length: Needle loop + Sinker loop •Extended sinker loop Face loop • Back loop Independent Needle Needle: United Needle Knitting M/C: there are three types of knitting M/C – 1. Warp knitting: Gives vertical movement of yarn. 2. Weft knitting: Gives horizontal movement of yarn. 3. Other loop forming and combined M/C: Tri-axial. Sunday, June 15, 2014 12
  13. 13.  Needle Carrier: Which carries needle.  Number of Feed System: The number of feeder by course.  Working Diameter: In circular knitting m/c, the distance from one needle exact to the other needle is known as working dia.  Working Width: In flat knitting m/c, the distance from first needle to the last needle is known as working width.  Gauge: Number of needle per inch.  Pitch: The distance the center from one needle to the center of another needle is known as pitch. There Are Three Types Of Knitted Fabric 1. Selvage fabric 2. Cut edge fabric 3. Tubular fabric Sunday, June 15, 2014 13
  14. 14. MECHANICAL PRINCIPAL OF KNITTING TECHNOLOGY Basic Elements of Knitting 1. Needle 2. Sinker 3. Cam 1. NEEDLE: There are various types of needle are available in market which can be divided in the following group. a. Spring Bearded Needle b. Latch Needle c. Compound Needle Sunday, June 15, 2014 14
  15. 15. Sunday, June 15, 2014 15
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  17. 17. SINKER Sunday, June 15, 2014 17
  18. 18. FUNCTION OF SINKER There are three function of sinker. 1. Loop formation 2. Holding down 3. Knocking over 1. Loop Formation: On bearded needle weft knitting machines of straight bar frame and sinker wheel type, the loop forming action is performed. The purpose of a sinker is to kink the newly laid yarn into loop as its forward edge of advance between two adjoining needle. 2. Holding down Sinker: The second function is hold down the old loop a lower level on the needle stem, then the new loop which are being formed and prevent to old loops from being lifted as the needles rise to clear from their hooks. 3. Knocking Over Sinker: The third function of the sinker is to knock over the old loops on the neck of the new loops. Sunday, June 15, 2014 18
  19. 19. CAM The knitting cams are hardened steels and they are the assembly of different cam plates so that a track for butt can be arranged. Each needle movement is obtained by means of cams acting on the needle butts. The knitting cams are divided in to three groups. Such as 1. Knit cam 2. Tuck cam 3. Miss cam Sunday, June 15, 2014 19
  20. 20. PRIMARY BASIC STRUCTURES Knitting Fabric Structure 1.Plain structure 2.Rib structure 3.Interlock structure 4.Purl structure Sunday, June 15, 2014 20
  21. 21. Knit calculation • A Single jersey Circular knitting machine, having dia of 30 “, 24 Gauge, 30 RPM, 3 Feeder/inch and yarn count is 26s. Efficiency is 90%. Calculate the production per day in kg? • • Solution: • Here, • Total no. of Feeder = Feeder per inch × Machine Dia • Total no. of needle= 𝜋DG • SL=2.2 mm • So, • = Sunday, June 15, 2014 21
  22. 22. Thanks to all Sunday, June 15, 2014 22

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