Denim fabric production technology and key points

1. The production process of denim fabric
According to the warp coloring method, the process can be divided into bundle coloring (ball warp coloring or rope coloring) and production-like coloring of sheet denim fabrics.
(1) Bundle coloring
The warp yarn process for bundle coloring is:
Ball warping → Bundle coloring → Warp splitting → Sizing → Heald drawing or warping → Weaving → Post-finishing
This process process masks the regional color differences caused by the coloring process by arranging the colored warp yarns twice in the process from warp dividing to sizing, making the finished product uniform and soft in color. , after the work clothes are stone ground and finished, there will be no color stripes and the quality is good. However, there are many processes, and the investment, floor space, and labor are relatively large.
(2) Flake coloring
The warp yarn process for flake coloring is:
Warping→dye paste→harness drawing or warping→weaving→finishing
This process is due to the During the coloring process, there are many stops and there is no double arrangement of warp yarns, so the color uniformity is difficult to control, the efficiency is low, and the consumption of indigo dye is large. But it has the characteristics of fewer processes, less damage to warp yarns, less investment, less labor and quick results. Most of the denim fabrics produced in my country adopt the process of sheet coloring.
(3) Weft yarn planning process
There are two situations. Weaving using shuttleless looms (air-jet looms, rapier looms, etc.) does not require the weft rolling process. Weaving with a shuttle loom generally requires a weft rolling process; with direct weft weaving, the weaving mill does not need to roll the weft.