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Main problems and solutions in rapier loom weaving(6)

Main problems and solutions in rapier loom weaving(6)

Issue Time:2021-07-29

38. What actions needed when the rapier loom is weaving colored fabrics with similar color yarns?

Try to separate the wefts of similar colors and don't put them on the adjacent color selection needles to avoid picking mistakes.

39. The change of the front and rear positions of the warp stop motion will change the length of the second half of the shed. What effect does this have on the clarity of the shed and the rate of warp breakage?

The warp stop motion moves forward, and the second half of the shed is shortened, which is beneficial to improve the clarity of the shed and reduce the fabric defects, but the warp breakage will increase.

40. What is the nominal width of a rapier loom? What is the effective reed width? What is the relationship between the two?

The nominal reed width of a rapier loom is one of the signs of the rapier loom model. If it is a four-link beating-up loom, the nominal reed width refers to the distance between the two cranks' center; if it is a conjugate cam beating-up loom, The nominal reed width refers to the distance between the centers of the conjugate cams on both sides. The effective reed width refers to the maximum reed width that can be actually used. Relationship between the two--the nominal reed width is bigger than the effective reed width, the difference between the two is around 5cm, e.g., if the loom nominal reed width is 190cm, the actual effective reed width is 185cm. If the loom nominal reed width is 230cm, the actual effective reed width is 225cm.

41. On the rapier loom with separate sley, how to calculate the on-loom reed length?

On-loom reed length = effective reed width + 5.5cm

42. What data should be applied in the calculation of the volume of weft yarn on the rapier loom?

The reed width should be the sum of the effective reed width and the waste yarn's width on both sides, which is generally 8~12cm according to each mill's situation. If the waste yarn's width is not considered, the volume of weft yarn will be insufficient.

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