Soybean protein fiber yarn
    

Soybean Protein Fiber (SPF) is made by means of wet spinning after extracting spherical protein from soybean residue with oil off biochemical and changing the space frame of the protein by adding functional agent. It has been praised locally and internationally by industry expert as the "Healthy and Comfortable Fiber of 21 Century". SPF uses soybean residue as raw materials that is generally used as fodders has rich resources in China and can be reused. So it won't rely on crude oil resources. SPF is a kind of environment protecting products, which do no harm to the environment, atmosphere, water and human body during its process of production SPF/cotton -Improve the comfort feeling, moisture conductivity and draping of cotton fabrics, increase the luster of fabrics and promote the grade of cotton products.

We can spin pure soybean yarn with different yarn counts blended soybean yarns mixed with other fibers with many kind of the proportions. the mixture of SPF with other natural fibers such as cotton, wool, cashmere, and chemical fibers such as modified polyester, viscose and tencel, modal, Bamboo fiber etc.
The dyeing Properties of Soybean Fibers
In general, soybean fibers can be dyed by common acid, 1:2 metal complex and reactive dyes. The advantages of reactive dyeing are their high fastness to washing, but the dark dyeing are not easily obtained. Soybean fibers are easily dyed to dark shades by common acid and 1:2 metal complex dyes, but these dyed fibers are subjected to poor fastness to washing. In practical dyeing, the dyes should be selected according to the end-uses of fibers, and dyeing fastness, cost and equipment.
The isoelecitic point of soybean fibers is 4 to 5 when soybean fibers are dyed by acid dyes, the PH value should be usually adjusted to 4 with a buffer, and the dyeing temperature is 90℃ to 98 ℃.At any time, it must be noticed the dyeing temperature cannot be above 100℃.
According to the dyeing tests about reactive dyes from Soochow University, Lanasol (Ciba) and Realan (Dystar) dyes whiten often used for wool dyeing is not suitable for the dyeing of soybean fibers. The dyes in the following table are recommended:
Reactive dyes Manufacturers Reactive dyes Manufacturers
Cibacron LS 80℃ Remazol RR 60-65℃
Cibacron FN 60℃ Levafix CA 60℃
Everlight ED 60-65℃ Megafix B 60-65℃
These reactive dyes in this table exhibit fixation behavior under the alkaline conditions and the temperature described above. The recommended alkali is soda ash; its amount is 2-5 g/L for pale shades, 6-10 g/L for medium shades, 11-15 g/L for dark shades and 15-20 g/L for specialty dark shades. The salt dose depends on shade depth and liquor ratio.