His report is divided into three parts:  

The first part describes why the sand washing process is needed. This is due to the characteristics of the fiber structure of Lyocell. The fibrillation performance of Lyocell, the severe transverse swelling performance of Lyocell, the swelling rate of 40% in the diameter direction, which is higher in the common fibers, squeezing the gap between the fibers after swelling, and cannot move between the fibers, resulting in a hard feel and easy fibrillation. In terms of the existing sand washing equipment and technology, air flow machine is common, characterized by easy to cause small imprint, scratch, long processing time. The traditional sand washing machine will cause large wrinkles and scratches. Holes, sand tracks, only a small batch, but also sewing, needing strong labor intensity. Rope continuous sand washing machine, big difference in edge, uneven, abrasion and so on.

In the second part, the open width continuous sand washing process of Lyocell is introduced. It has the characteristics of no scratch, no pleat, short time, boundless and high efficiency. Take the same 21X21 108X64 2amp 1G100 Lyocell 190g as an example, compared with sand washing cylinder, the labor cost, water cost and steam cost are lower, saving more than 2800yuan/day.

The third part describes the problems encountered in the main new process and their solutions. Scratch, the swelling of Lyocell fabric in caustic soda is greater than that in water, which affects the feel of Lyocell fabric. Lyocell fabric can be treated with different concentrations of caustic soda in dry state to improve its handle. Acid has an effect on strength, and the PH value of cellulase has a great influence on the strength of Lyocell woven fabric. One is the difference of PH value of cloth surface, the diversity of cloth species, and the other is the difference of PH value caused by workers' batching, which needs to use PH stabilizer. The problem of cloth is to determine the dosage of auxiliaries according to the speed, the weight of the fabric and the style of the finished product, and the other is to determine the parameters such as temperature, PH value, time and so on.