Projectile weaving:
- A gripper projectile transports a single weft yarn into a shed.
- Projectile machines are available with
1.unilateral picking combined with multiple projectiles, or
2.bilateral picking with a single projectile
- Multiple projectile weaving is suitable to weave dobby, jacquard, and terry fabrics, from continuous-filament as well as spun yarns, and with up to six different colors of weft.
Figure: Projectile Weaving Machine
- The multiple – grpper w.m. is a versatile unconventional loom and it offers an advantage of a combination of a wide width and high speed in order to attain high productivity levels.
- Energy required for picking is built up by twisting a torsion rod.
- The projectile is braked in the receiving unit and conveyed to its original position by a transport device installed under the shed.
- The single rapier w.m., extends the full width of the warp.
- In the weft insertion by double rapiers, the weft yarn is is inserted half way into the shed by one carrier and then taken over in the center by the other carrier and drawn out to the opposite side of the fabric.
- The telescopic rapier is a kind of rigid rapier which enables a considerable floor space saving.
Figure: Rapier Weaving Machine
- It should also be remembered that only 50% of the rapier movement is utilized in weft insertion, and, for single-rapier looms, this wasted movement is also a time loss.
- The future of this method of weft insertion would appear to lie mainly in the field of multi-color work.
1 comments:
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