Silk is a continuous long fiber which is solidified by the silk secretion secreted by the silkworm. It is also called natural silk fiber,one of the earliest animal fibers by human use. Silk is one of the products of ancient Chinese civilization. Silkworms and silk are also recorded in Oracle.
The silk thread drawn from a single cocoon is called silk fiber. When reeling silk, the silk fiber of several silkworm cocoons are extracted, and they are bonded into silk by sericin, collectively referred to as silk yarns,called raw silk. Silk which removes sericin is called refined silk. The largest amount of silk is mulberry silk, followed by tussah silk, and other silks do not form resources due to the limited amount. Today we mainly talk about mulberry silk.
According to expert research, it was first discovered that silkworm cocoons can be drawn, and there are many possibilities. silkworm chrysalis are probably one of the foods of the ancients. When peeling, you must first tear off the cocoons’ cover and then bite.(The cover means the outermost silk fiberof cocoon.) Due to accidental reasons, some people put the silkworm cocoons in the mouth. After the clams were infiltrated in the spittle for a long time, the sericin dissolved and the densely twisted silks separated, thus unintentionally finding the silkworms wrapped around the silkworm cocoons. In addition, in the process of tearing the clam silk cocoons,it is also possible to pull the wire. After repeated practice, we realized that the silk cocoons can be simmered in hot water at the right water temperature, so that the silk cocoons are boiled in hot water, and the sericin is removed. This is the earliest reeling silk technology. The silkworm silk is very fine, only 20 to 30 micrometers, and it is difficult to use it alone. Therefore, when reeling silk, it is necessary to gather the silk thread and wind the wire, which is to twist a plurality of twisted wires together to form a silk yarns. In modern silk technology, there are usually 8 silkworm cocoons.
The mulberry silk contains 18 kinds of amino acids which are very valuable to the human body, such as alanine, glycine, serine, tyrosine, aspartic acid, threonine, arginine, lysine, glutamic acid, Methionine, tryptophan, valine, cystine, valine, isoleucine, leucine, phenylalanine, histidine.
The silk is light and slender, the fabric has good luster, comfortable to wear, smooth and full-feeling, poor thermal conductivity, moisture absorbing and breathable, used for weaving all kinds of satin and knitwear. In addition to silk home textiles and silk clothing, it is also used in industry,defense,medicine and other fields.
Silk quilt, silk pillow, silk kit, silk pillowcase, silk sleeping cap, silk carpet, etc.
Pajamas, all kinds of fashion garments
Silk and human body’s keratin and collagen are both proteins, and their structures are very similar. Therefore, they have excellent biocompatibility. The silkworm artificial blood vessel does not cause allergies or carcinogenesis in the body, and can also be connected with living flesh and blood to grow into the same outer wall and inner membrane as the true blood vessels.
After the mulberry silk is degummed, dissolved, and purified by dialysis, a pure silk fibroin solution can be prepared, and the silk fibroin solution is placed in a plastic mold, dried to form a film, and finally sterilized by Co60 radiation to form a “silk fibroin film”. The membrane is specially designed for the application of burn wounds to help wound healing, also known as “artificial skin.”
Since mulberry silk contains 18 kinds of amino acids which are extremely nutritious to the human body, according to this characteristic of silk, people have developed a series of cosmetics with silk fibroin as the main raw material. In 1973, Japan published a new process for the use of silk for cosmetics. There are two kinds of silk fibroin used as cosmetics: one is a “silk powder” (or insoluble silk protein) which is directly obtained by de-doping, degumming, washing and refining silk fibers, but due to the large molecular weight of the silk powder, Also insoluble in water, more difficult to be absorbed by the skin. The other is to further cleave the silk fibroin chemically, so that the filamentous macromolecular chain macromolecules are decomposed into shorter protein molecular chains, that is, silk fibroin peptides, also called silk peptides, which are commonly seen.
Silk can also be made into silk protein for people to eat. This technology was first developed by the Japanese. The jelly molecules of this jelly, which was originally tested, are still composed of larger molecules joined by thousands of amino acids and are not easily absorbed by the intestinal wall. Therefore, the actinomycete enzyme capable of decomposing the protein is further decomposed into an oligopeptide and an amino acid powder, and the absorption rate can be greatly improved. Nowadays, foods that have been added to the cracked silk powder in the Japanese market, such as cakes, biscuits, noodles, jellies, ice cream, beverages, tablets, and candy, have been welcomed by consumers. These foods contain 18 amino acids, which are low in fat and carbohydrates and are considered a healthy green food.