Classification of silk:
Silkworms are divided into: mulberry silk and wild silk (including quassia silk, cassava silk, castor silk, asparagus silk, camphor silk) Explanation: bicungal silkworms
(1) Mulberry silkworms: Mulberry silkworms are domesticated silkworms. A cocoon is composed of a 800-1500 meters long sericin fibers, long up to 3,000 meters; mulberry silk is hygroscopic, high strength, soft to the touch, shiny surface, poor acid resistance, poor light resistance.
(2) Quercus serrata: Quercus serrata is a wild silkworm that feeds on all kinds of wild leaves. Quercus serrata silk silk gel content is less than mulberry silk, 12% -15%, silk prion inside and outside the pigment, impurities are more difficult to remove, Quercus serrata silk was originally brown, by unshu processing reeling into raw silk was yellowish, luster is better, because of its own natural pigments, Quercus serrata silk is generally difficult to bleach, dyeing, easy to return to the yellow, fading after sun exposure. Because of its good elongation, the fineness of Quercus sericata silk is generally 5.55dtex (5 denier) in natural fiber, which is slightly coarser than that of mulberry silk, and the uniformity of fineness and coarseness is also slightly worse.
Xu Yongchun.
3) The grade of the silk quilt:
The silk filler of the silk quilt is mainly divided into four categories; staple fiber silk, quassia silk, ordinary long-fiber mulberry silk, and degreased long-fiber mulberry silk, and accordingly, it is divided into four grades: Grade A, Grade AA, Grade AAA and Grade AAAA.
① Short-fiber Silk, Grade A
Short-fiber silk, in the level we call A grade silk, its fiber is only 2-75px long, the price is generally about 50 yuan 1 catty. Although the name is called silk, but the natural shape like cotton, short flocculent and no connection. In the production of silk tires like tofu blocks to do the diffraction of the seam processing, in order to reduce the internal structure of the silk tire shift. In the market, manufacturers generally call it "ordinary silk".
② Quercus sericata AA grade
Quercus sericata, at the level we call AA grade silk, its fiber is generally 0.5 meters, clear, durable than long-fiber mulberry silk is a little worse. Starting the original color for the yellow-gray. Therefore, in the production process needs to be faded with acidic and alkaline chemicals to deal with white, and thus have a certain degree of harm to human health.
③ Ordinary long-fiber mulberry silk AAA grade
Ordinary long-fiber mulberry silk, at the level we call AAA grade, its fibers are generally more than 1 meter, and even up to 2 meters, so the price is very expensive, generally need to be 100 yuan a catty. Its original color is pure white, finer and smoother than Quercus sericata.
④ Skimmed long-fiber mulberry silk AAAA grade
Skimmed long-fiber mulberry silk, which we call AAAA grade in terms of level, has been degreased on the basis of ordinary long-fiber silk. Therefore, this kind of silk quilt can be used for a long time.