Warp preparation: Warp preparation of ramie cotton ramie cotton denim includes yarn fixed twist, winding, warping, warp indigo dyeing, sizing, warping and other processes.

（1） Yarn fixed twist: In the production of ramie cotton denim, the warp and weft yarn, especially the rotor yarn with large twist, should be wetted and heated to stabilize its twist.

1. Mechanism of fixed twist

2. Purpose and requirements of fixed twist

The purpose is to ensure the smooth operation of warping and sizing processes, reduce the phenomenon of weft shedding, weft shrinkage and looping during weaving, and improve the fabric quality.

Requirements: increase tension, wet, heat and other methods to stabilize yarn twist, and the reasonable moisture regain is 8%~9%

（2） , winding

1. Meaning of yarn winding for ramie cotton denim

(1) Change the packaging method

(2) Remove yarn defects Remove harmful defects on the original yarn in the winding

(3) Improve yarn tension

(4) Reduce bobbin yarn

2. Functions of winder

(1) Excellent splicing function

The so-called splicing is to untwist the ends of the broken yarn into loose fibers with other forces, and then lift the ends together from the beginning.

(2) Excellent yarn defect removal ability

(3) Excellent unwinding function

(4) Better winding density and hardness

（3） , warping

1. Introduction

The main purpose is to make the tension, arrangement and winding of the yarn piece or rope bundle uniform, and to wind a certain number of bobbins evenly and tightly on the warp or special ball axis according to the regular length under uniform and common tension, so as to prepare for the next dyeing and sizing process.

2. Mainly 1452A or GAI2I batch warping machines. These warping machines can meet the quality requirements when used in the dyeing and pulp joint production line.

Dyeing and finishing process of ramie cotton denim

The production process of ramie cotton denim is quite common. It is a product that is dyed and sized with indigo before weaving.

1. Dyeing and sizing

Indigo dyeing of ramie cotton denim warp yarn can be divided into rope dyeing, sheet dyeing and suspension ring dyeing. The first two are connected with sizing, and the last one is dyed and sized.

(1) Rope dyeing

(ring spun yarn) inserting and winding - (rotor spun yarn) warping - rope frame - indigo continuous rope dyeing - long chain warp - sizing - weaving - fabric inspection - post-processing - pre-shrinking

(2) Dyeing and sizing of sheet yarn

(ring split yarn) inserting winding - (rotor yarn) warping - indigo dyeing of various sizes - weaving - fabric inspection - singeing - post-processing - pre-shrinking and cleaning

(3) Suspension ring dyeing

This method uses a dyeing bath, in which the warp yarn is repeatedly dyed for many times, and it is always required to stop when reaching the depth. The process of dyeing and sizing is as follows:

Warp yarn feeding - alkali boiling (or wetting) - water washing - indigo dyeing - pervious oxidation (indigo dyeing) - pervious oxidation process is cycled six times - water washing four times - drying - yarn storage - sizing - drying - upper shaft

After finishing

Brushing (single or double sided) - singeing (single or double sided) - desizing - dipping and cleaning (one or two courses) - stretching (to the required width) - stretching (3/1 or 2/1 twill linen cotton denim to do this to avoid fabric distortion) - drying (12~14 drying cylinders, moisture regain 12%~15%)

4. There are many processes for post-processing of ramie and cotton denim, mainly including singeing, weft finishing, anti-shrinking and other processes

4.1 Common sense of jeans washing

There are many processes to be followed up after the denim clothing, which is an important part of the development of denim clothing series. There are mainly enzymes, stone grinding, sandblasting, cat whiskers, silicone oil, bleaching, color matching, and snowflake washing.

Classification of washing process for jeans

1. Hand rub

2. Water washing: general washing, stone washing, enzyme washing, rinsing, fried snowflakes, chemical washing, blue grain washing

3. Cat whiskers: sand blasting, sand washing, monkey washing, three-dimensional cat whiskers

4. Destructive washing

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