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[Chemical Knowledge]：Modal's manufacturing methods and processes.

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Modal is a regenerated cellulose fiber that is widely used in clothing and home textiles for its softness, moisture absorption and comfort. In the field of chemical production raw materials, Modal's manufacturing method involves multiple steps and processes. This article will detail the manufacturing process of Modal.

1. raw material preparation

1. wood: modal's main raw material is wood, such as eucalyptus, pine and so on. Selection of fast-growing, high fiber content of the tree is preferred.
2. Chemicals: In the production process, some chemicals need to be used, such as sodium hydroxide (caustic soda), carbon disulfide, etc.

2. pulping

1. wood crushing solution: the wood is crushed into small pieces to facilitate subsequent chemical treatment.
2. Chemical pulping: the use of sodium hydroxide (caustic soda) and other chemicals, chemical treatment of wood, so that its fiber separation, the formation of pulp.

3. Alkali Cellulose Preparation of

1. Alkalization: The pulp is mixed with sodium hydroxide solution to ionize the hydroxyl groups on the cellulose molecular chain to generate alkali cellulose.
2. Aging: Let the alkali cellulose react at a certain temperature and time to change its molecular structure and improve the reactivity of cellulose.

4. Yellowing

1. Impregnation: Alkali cellulose is immersed in a solution containing carbon disulfide to yellow the cellulose.
2. Extrusion: Extrude the yellowing alkali cellulose to remove excess water and chemicals.

5. Dissolution and Regeneration

1. Dissolution: Dissolve the yellowing alkali cellulose in sodium hydroxide solution to form a viscous solution.
2. Filtration: The solution is filtered to remove impurities.
3. Regeneration: The filtered solution is passed through a spinneret to regenerate the solution into modal fibers in the coagulation bath.

6. post-treatment

1. washing: washing the regenerated modal fiber to remove residual chemicals.
2. Drying: The washed modal fibers are dried.
3. Spinning: The dried Modal fibers are spun to form Modal yarns.

Through the above steps, we can manufacture high-quality modal fiber. This fiber has good moisture absorption, permeability and elasticity, and is widely used in clothing, home textiles and other fields.

In the manufacturing process, you need to pay attention to the following points:

1. Control the quality of raw materials: Choose tree species with fast growth rate and high fiber content, and ensure the quality of chemicals.
2. Control reaction conditions: In the process of pulping, alkali cellulose preparation, yellowing, etc., it is necessary to control the appropriate reaction temperature, time and pH value to ensure the smooth progress of the reaction and the quality of the product.
3. Keep the equipment clean: In the production process, it is necessary to keep the equipment clean to avoid the impact of impurities on product quality.
4. Strict quality control: In the production process, strict quality control is required for each step to ensure that the quality of the final product meets the requirements.

In short, Modal's manufacturing method involves multiple steps and processes, and factors such as raw material quality, reaction conditions and equipment cleaning need to be strictly controlled to ensure the quality of the final product.

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