Question 14 (Textile Engineering & Fibre Science)
The factor that does not influence the propelling force for moving the weft yarn on air jet loom is
| (A) | Coefficient of friction between air and yarn |
| (B) | Air velocity |
| (C) | Yarn strength |
| (D) | Yarn diameter |
Answer / Solution
[Show Answer]
Option C
Frequently Asked Questions | FAQs
What is the mechanism of weft insertion in airjet?
In air-jet weaving, the weft yarn is inserted into the warp shed using compressed air. The basic mechanism of weft insertion in air-jet weaving involves the following steps:
Shedding: The warp yarns are separated to form a shed, which is the space through which the weft yarn is inserted.
Insertion: A yarn package or a bobbin containing the weft yarn is placed in the weft insertion system of the air-jet loom. Compressed air is then released from a nozzle, which propels the weft yarn through the shed at a high speed.
Beat-up: Once the weft yarn has been inserted into the shed, the reed moves forward to push the newly inserted weft yarn against the previously inserted weft yarn. This process is known as beat-up.
Take-up: The cloth is advanced by the take-up motion, which rolls up the woven fabric onto a cloth beam.
The weft insertion in air-jet weaving is a rapid process that requires precise control of the air pressure, timing, and nozzle geometry. The compressed air must be released at the right moment and with the right force to ensure that the weft yarn is inserted accurately and consistently.