Web stitching & stitch bonding warp knitt

1. Web stitching & stitch bonding By Himanshu G upta

2. Introduction Categorized under mechanical bonding technique. Stitch bonding is a hybrid technology, which uses elements of various technologies from non woven to sewing & knitting. It can be done with or without addition of a thread, when no thread is used it is often termed as “Loop formation”.

3. Principal Locking of layers of Cross laid webs of fibres, non woven or other flat sheet into the warp knit structure, thus combining knit fabric properties with base structure with selected mechanical & functional features for its end use. Stitch bonding consist of pointed needles arranged in a row, moving reciprocal back & fourth into the fibrous layers synchronized insertion of stitching yarn by each penetration of needle. Latches pulls the yarn from one side to the other side .

4. Stitch bonding M/c needle motion knockover and support combs guide bar device for transport of the web fabric draw-off from the needle motion and fabrics take-up device for feeding and guiding the warp threads

5. Mechanism P enetration L apping C losing K nocking-over T ake-down

6. Stitch bonding systems or technique Stitch bonding of webs with stitching thread. ( MALIWATT TECHNIQUE) Stitch bonding of webs without stitching thread. (MALIVILIES TECHNIQUE) Stitch bonding of webs with loop formation (MALIPOL,VOLTEX, KUNIT MULTIKNIT TECHNIQUE).

7. MALIWATT 1 Maliwatt machine 2 warp beam creel 3 knitting threads 4 lap layer 5 web 6 stitch-bonded material 7 pad lapper

8. The horizontal compound needle , which operates in conjunction with the knock-over sinker and the supporting rail, needles penetrates through the substrate which is normally a cross-laid web. The stitching yarn, which is inserted via the guides into the open hooks of the compound needles, forms stitches that penetrate the web .

9. Maliwatt application Soft furnishings, upholstery fabrics for mattresses and blankets. Transportation cloth. Cleaning cloths, fabrics for hygiene and sanitary purposes. Secondary carpet backing. Lining fabrics, interlining for shoes and apparel. Adhesive tapes (e.g., those used for harnessing electric cables in automobiles) Insulating materials. Geo textiles, filter fabrics.

10. Properties

11. Malivlies Loops formed by the thread present in the web itself. fibres are preferably cross wisely oriented.

12. MALIVILIES – APPLICATION: 1. Car interior cover 2. Felts or textile coverings 3. Absorbents 4. Polishing cloths 5. Geo textile and filter cloths 6. Covering substrates and laminates 7. Products for medical 8. Carpet backings

13. Properties

14. M ALIPOL Malipol stitch bonding systems have the following main elements. pile yarn ground fabric stitch bonding head fabric take-down and batching The compound needles penetrate the ground fabric and the stitching or pile yarn is overlapped in the needle hook. The pile yarn is also laid on top of the pile sinker at the same time so that a tricot racking is used to create the pile and knit the yarn into the ground structure.

15. Working

16. Malipol - areas of application blankets cleaning textiles (wiping mop) pile fabric for velcro fastening stripes lining plush and soft-toy plush bathroom sets one-sided terry fabric

17. Voltex Voltex fabrics are high pile or high plush fabrics Two principal reformed elements: a ground fabric and a web, which are continuously introduced

18. Application lining fabrics soft-toy plush shoe uppers and shoe lining floor coverings upholstery fabrics.

19. Kunit 3-D pile fabrics distinctive folded, pile variable thickness and density if required 1 . Compound needle bar 2. Closing wire bar 3. Knockover sinker bar 4. Supporting bar 5 . Oscillating Brush bar 6 . Pile sinker bar 7 . Base material 8. Fibre web

20. Multiknit base materials are one or two textile fabrics with open-pile structure, preferably Kunit nonwovens . end product, the two nonwoven surface textiles are interlaced by fibers , forming an uniform and tight surface, being connected by almost vertically arranged fibers . Special advantages are high degree of volume (bulkiness) and elasticity of compression

21. Working 1 . Compound needle bar 2. Closing wire bar 3. Knockover sinker bar 4 . Counter retaining bar 5 . Supporting rails 6 . kunit -fabric

22. The compound needles take the pile fibres of both fabrics to make them, in the middle between the two fabrics, into a third layer of loops. Application 1. WADDING FOR FURNITURE 2. FILTER CLOTH 3. INSULATION MATERIALS 4. LININGS FOR CLOTHING 5. HEAT- RETARDANT MATERIALS 6. SOUND- ABSORBING MATERIALS

23. Warp Knitting

24. What is warp knitting Warp knitting is defined as a stitch forming process in which the yarns are supplied to the knitting zone parallel to the selvedge of the fabric, i.e. in the direction of the wales . In warp knitting, every knitting needle is supplied with at least one separate yarn. In order to connect the stitches to form a fabric, the yarns are deflected laterally between the needles. In this manner a knitting needle often draws the new yarn loop through the knitted loop formed by another end of yarn in the previous knitting cycle

25. Difference b/w weft & warp knitting Weft Knitting Warp knitting Yarn are fed course wise direction Yarns are fed wale wise direction Yarn supply is usually in the form of a cone or cheese Yarn is in one long beam or small warp beams Usually latch needles are used Latch, beard or compound needles are used Extensibility in widthwise & lengthwise direction It stretch in lengthwise direction Higher shrinkage Comparatively less shrinkage property Any no. needed One yarn is required for each needle

26. Warp knitting movements Swing :- front to back movement Shog :- lateral movement of guide bars Overlap :- Movement of guide bar to wrap yarn on needle at back of m/c Under lap :- movement of guide bars to wrap yarn on needle at front of m/c

27. Start of new course Start of overlap Guide bar swinging motion Return swing after overlap Old loop closing latch Knock over & underlap movements

28. Applications Apparel :- S portswear, track suits, leisure wear & safety reflective vests. Household :- Furnishing, laundry bags, mosquito nets. Automotive :- Car cushion head rest lining, sun shades and motorbikes helmets. Industrial :- Pvc backing, production masks, caps & gloves.

29. Thank you