![What are the speed of different Looms?
What is weft Insertion Rate(WIR)?
WIR=Loom speed X Reed Width [at 100% efficiency]](https://image.slidesharecdn.com/l1-2introductionshuttle-240815174711-7c11cfc0/85/L1-2-introduction-to-the-looms-Shuttle-ppt-10-320.jpg)
L1-2 introduction to the looms Shuttle.ppt
- 2. 1. Classification of Loom
- 5. 2. Comparison of Non automatic and Automatic Shuttle loom. 3. Disadvantage of Shuttle Loom.
- 6. Automatic Shuttle Loom used in 1970s
- 8. 4. Different Types of Weft Insertion System
- 10. What are the speed of different Looms? What is weft Insertion Rate(WIR)? WIR=Loom speed X Reed Width [at 100% efficiency]
- 11. Shuttleless Loom There are FOUR different type of shuttleless looms They are Rapier loom (single and double type); Gripper or projectile loom; Water jet and Air jet loom
- 12. Shuttleless Loom Projectile loom (I) The picking action is accomplished by a small bullet-like gripper which grips the weft yarn and carries it through the shed. This is a more positive way of inserting the weft yarn without restoring to the heavy shuttle. Because the mass of gripper is low, the forces needed to accelerate it are less and the picking mechanism can be lighter. In addition, the running speed of the looms can be increased significantly compared with conventional shuttle loom.
- 13. Projectile Loom Small bullet-like gripper is passed from one side to the other inside the shed Gripper
- 14. Projectile Loom Bullets inside the rail
- 15. Shuttleless loom Projectile loom (II) Several grippers are normally used in the loom. While one is crossing the loom with weft yarn, the others are returning to the starting position The dragging of the weft yarn across a loom creates strain on this yarn, so projectile looms are not suited for weaving with very weak yarn. However, it is excellent for use with heavy and bulky yarns, as well as regular size yarns. It is the most versatile of the shuttleless looms in regard to the range of fabric it can produce. Several grippers are normally used in the loom. While one is crossing the loom with weft yarn, the others are returning to the starting position The dragging of the weft yarn across a loom creates strain on this yarn, so projectile looms are not suited for weaving with very weak yarn. However, it is excellent for use with heavy and bulky yarns, as well as regular size yarns. It is the most versatile of the shuttleless looms in regard to the range of fabric it can produce.
- 18. Weight: 40 gm Length: 89 mm Width: 14.3 mm Height: 6.35 mm Clamping Area : 3.8x5.0 mm2
- 19. Aligned Guide Staggered Guide
- 20. Shuttleless loom Rapier Loom A rapier loom uses a rapier to pull the weft yarn across the loom. It can be a single rapier or double rapier. For a single rapier, a long rapier device is required to extend across the full width of warp. For a double rapier loom, two rapiers enter the shed from opposite sides of the loom and transfer the weft from one rapier head to the other near the centre of the loom The advantage of two rapier system is only 50% of the rapier movement is utilized in the weft insertion of single rapier loom
- 21. Yarn is passed from one rapier head (LHS) to other rapier head (RHS). Double Rapier Heads
- 25. Shuttleless Loom Air Jet (I) Jet looms take the weft yarn across the loom by using a high speed of either air or water. The force of air or water carriers the yarn from one side to the other. Jet looms are faster than projectile or rapier looms (picks per minute). However, they cannot produce as great a variety of fabrics (no heavy or bulky yarns), nor can they produce as a wide a fabric (jets have less yarn-carrying power). Jet looms also do less damage to the warp since there is no abrasion of this yarn by the jets of air or water, unlike the projectile or rapier.
- 26. Air Jet Loom Multiple air nozzles are used to insert the weft yarn into the shed Air nozzle
- 27. AIR JET WEFT INSERTION SYSTEM
- 28. Shuttleless Loom Air jet (II) With the air-jet looms, the initial propulsion force is provided by a main nozzle. Relay nozzles (auxiliary nozzles) along the shed produce additional booster jets to help carry the yarns across the loom. The fabric width of air-jet loom is normally narrower than rapier or projectile loom
- 30. Air Jet Loom Main Air Nozzle
- 31. Shuttleless Loom Air jet Air jet loom in action (Video)
- 32. Water Jet Loom (Toyota)
- 33. Shuttleless Loom Water jet (I) With water-jet looms, there is only a main nozzle to provided the propulsion of the weft yarn. The loom is very efficient, with only a small amount of water required and is the fastest type of shuttleless loom. Water-jet looms are capable of producing 700 picks per min (ppm) for 75-inch fabrics compared to about 180 picks per min for shuttle looms with 44-inch fabric.
- 34. Shuttleless Loom Water jet (II) Since wet fabric cannot be stored in a roll, water- jet looms are equipped with efficient drying units. The units use vacuum suction and heat to remove the water from the fabric. Water-jet looms are best suited for weaving filament yarns made of hydrophobic fibres (water-resistance fiber) like nylon, or polyester/cotton. Yarns made of fibres that lose strength when wet (e.g rayon) should not be used.
- 35. Discussion What are the advantages of shuttleless loom over the shuttle loom ? Amongst all the shuttleless looms, which one runs fastest, and which one produce the most versatile textile fabrics (heavy/medium/fine fabrics)?