The warp tension of high-speed shuttleless looms is higher than that of conventional looms. Normally, the working speed of the shuttleless loom is three to four times faster. If the quality of the warp yarn remains the same, the end breakage will increase three to four times, resulting in low output. The yarn should be more uniform, and the following parameters of the yarn should be strictly reviewed; count CV, single yarn strength CV, single yarn strength CV, thick, thin, neps and other defects per 1000 meters. Wool yarn is not suitable for air-jet weaving because it will mislead the weft.

On some rapier looms, the interference of the rapier at the beginning of the entrance and the end of the exit of the shed will cause the top yarn sheet around the rapier head to bend, thereby generating excessive warp strain in the selvage area of ​​the warp yarn. The tension of the weft on the Sulzer Ruti projectile loom is also high, forming a hemming. The consistency of single-ended strength, count and elongation CV is very important. The yarn quality should be at least 25% Uster, which means that the quality is among the best in the world's 25% factories.

This article was originally published in the "Textile Review" magazine published by Saket Projects Limited in Ahmedabad in February 2013.

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