(1), yarn fixed twisting:
In denim production, warp and weft yarns, especially yarns with large twist, are used to wet and heat the warp and weft yarns to stabilize their twist.
The purpose is to smooth the warping and dyeing process and reduce the weft, weft and loop in weaving, so as to improve the fabric quality.
Requirements: increase tension, moisture, heating and other methods to stabilize yarn twist, reasonable moisture regain 8%~9%
(two) the meaning of the collaterals used in the winding denim
(1) change the form of coiling
(2) remove the defective defects in the winding yarn by removing the yarn defects.
(3) improving yarn tension
(4) reducing the barrel foot yarn
1. the main purpose is to make yarn or rope bundle tension, arrangement and winding three uniform, and a certain number of bobbin yarn, uniform tension in accordance with the specified length, uniform and close winding on the axis or special ball axis, for the next channel dyeing and sizing processing.
2. is mainly 1452A or GAI2I batching warping machine. These warping machines can meet the quality requirements when used in dyed joint production line.
Dyeing and finishing process of denim
Denim is unique in its manufacturing technology. It is first made of indigo blue dyed warp and sizing and then woven.
1. dyeing and sizing
There are three kinds of denim warp dyed indigo dyeing: rope dyeing, yarn dyeing and hanging ring dyeing. The first two are joined to the sizing and the latter is dyed.
(1), rope coloring
(ring yarn) cross winding - (rotor spun yarn) warping - rope form - Indigo continuous rope dyeing - long chain yarn sizing - sizing - finishing - post-processing - pre finishing.
(2) coloring and sizing of flake yarn
(circular yarn) cross winding - (rotor yarn) warping - Indigo Dyeing sizing - weaving - cloth inspection - singeing - post-processing - pre - finishing.
(3) hanging ring dyeing
In this method, a dyeing trough is used, and the warp yarn is repeatedly dyed and repeatedly dyed in the trough until the depth requirement is reached. The process of dyeing and sizing is:
Warp yarns - alkali boiling (or wetting) - water washing indigo dyeing - air permeability oxidation (indigo dyeing) - the cycle of six - washing four times - drying - storage - sizing - drying - upper shaft
Finishing of denim
Process flow of conventional denim finishing
Grey cloth, singeing, sizing, weft insertion, pre drying, blanking, blanking, blanking, drying, finished product testing and packaging.
1. Technical requirements of burning
Remove the hairiness and fine impurities on the surface of the fabric, making the finished product smooth and smooth.
2. The reference standard for the quality of the burning
Under certain tension conditions, the fabric should be observed and evaluated when the light is adequate. The denim must be more than four grade.
Improve the fabric's water repellency and maintain a certain moisture regain, so that the pre shrinkage finishing is carried out smoothly. Keeping the fabric pre shrinkage effect, the thin pulp drying can play a fixed role, prevent the fabric from generating back elongation after the machine, in order to steadily increase the shrinkage of the fabric; improve the fabric hand feeling, improve the sewing performance; ensure that the fabric meets the required weight requirements and stiffness.
Three. The whole latitudes (drawing oblique)
Eliminate the potential zonal skew stress existing in the fabric due to yarn twist, tension and fabric structure. Different denim fabrics with different yarn number and variety structure have different potential skew stress and different weft deviation requirements. The general heavy (440g/m2 or above) denim is in the weft angle of 3 degrees ~4 degrees 30, or the slope of weft is between 7%~8.5%.
Process arrangement: after sizing, before drying.
Eliminate the most potential shrinkage stress of fabric, reduce the shrinkage rate of finished products and meet the requirements of garment processing. It is required that the residual shrinkage ratio of the cowboy finished fabric is less than 3%, and the super shrink proof denim with special requirements is less than 1%. It is required that the shrinkage rate of the same denim is uniform in the middle, right, head, middle and tail, and the shrinkage of the denim is basically the same.
Five. Washing water
There are many procedures for finishing jeans, which is an important part of developing cowboy clothing series. Among them are enzymes, stone mills, sandblasting, cat whiskers, silicone oil, bleaching, coloring and snowflake washing.