What is milk yarn? what is the production process of milk yarn?


What is milk yarn? In fact, the essence of milk yarn is […]

What is milk yarn? In fact, the essence of milk yarn is the same as its name, it is milk protein fiber, so it is also called milk yarn or milk fiber. It is a new type of fiber, which belongs to the newer generation fiber after the first generation natural fiber and the second generation synthetic fiber. Its principle is to use bioengineering technology to implant bovine casein fibers into synthetic fibers. After that, this fiber successfully possessed both excellent properties. This is a landmark creation and the result of modern scientific progress. Its creators were the Italian company SNIA and the British company Coutaulds in 1935. Later, Toyobo Co., Ltd. was the successor. It used New Zealand milk protein solution and acrylonitrile polymer to blend, copolymerize and graft to truly produce milk protein long yarn, and this technology was successful in 1969. Industrial production. With the gradual decrease of oil, people's attention to health and the improvement of living standards, the research on milk yarn has also begun to deepen.
So how does this milk fiber come from? We know that the main components of milk are composed of protein, water, lactose, vitamins and ash. Among them, protein is the main raw material for manufacturing milk protein fiber. Milk protein can be spun into fiber, which constitutes the most basic requirement for fabrics. And this is because it has the basic conditions for fiber-forming polymers.
The basic conditions of milk fiber fibrillation:
1. Milk protein has a chain shape, not a globular protein like hemoglobin;
2. it has a certain degree of flexibility and intermolecular forces, because macromolecules are composed of countless peptide bonds, and there are hydrogen bonds between macromolecules, and there are other intermolecular forces contributed by polar groups such as -SH, -NH2, etc. ;its
3. it has good spinnability. After the protein and water form a colloidal solution for spinning, the water is volatilized and removed, and the two molecules will move closer to each other to form a hydrogen bond, so that the polypeptide chains are arranged in parallel or even twisted together to solidify into yarn. The breaking strength of the strip can reach 2.5cN/dtex, which can meet the basic requirements of textile fibers.

The production process of milk yarn:
The production process of milk protein yarn can basically be divided into three parts: the preparation of casein, the preparation of spinning dope and draft spinning. The basic raw material of yarn is cow's milk, and cow's milk contains more than 80% water, so dehydration is essential. Then this is not over. After dehydration, alkali is added for deoiling and degreasing. Finally, the protein is separated and purified by salting out or dialysis. Then it is blended, crosslinked, or grafted with polyacrylonitrile or polyacryl alcohol. After that is the last few steps we are more familiar with, using wet spinning to form fiber, curing, drafting, drying, crimping, setting, grading, packaging, etc.
Milk yarn is a new type of fiber that has emerged with the development of the times. It has a sense of time and science. Because it is a protein fiber, it is not only harmless to the human body, but also has benefits. It is a fiber with great development potential. Innovation and development are always the same theme, and milk yarn will inevitably become a new fabric business opportunity.

Hangzhou Kaili Chemical Fiber Co., Ltd. is professional milk yarn Manufacturers and suppliers, we produce more than 30,000 tons of various milk yarn,  black, white and color-spun polyester yarns (POY yarn, FDY yarn, DTY yarn, embroidery threads and carpet yarns) every year. If you have any need, please visit our official website ( and contact us!

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