The product obtained from silk reeling of mulberry cocoons. Put the excellent cocoons into a cocoon boiling machine at 80 ℃ hot water to soften and loosen them. Then, use a broom to pull out several cocoon threads together and continuously wrap them on the silk reeling frame, which is called "silk reeling"; Due to the fact that the cocoon silk still contains about 20% of sericin, the glossy silk is covered by sericin, resulting in a slightly hard and semi transparent texture. It is called "raw silk". Due to the average length of silk that can be reeled from a single cocoon reaching 600-800 meters, raw silk is a continuous fiber, making it highly suitable for weaving; After refining and removing the gum, raw silk becomes soft and shiny, known as "ripe silk"; According to the purpose of the product, there are different refining methods for raw silk, including three parts, five parts, and seven parts.

Raw silk is soft and smooth, with a full hand feel, good strength and elongation, rich in elasticity, soft luster, strong moisture absorption, and non irritating to the human body. It is a high-end textile material that can be woven into various types of silk fabrics with different tissue structures, used for clothing, indoor products, handicrafts, decorations, etc. Raw silk also has high specific strength, excellent electrical insulation, good insulation, and the characteristic of being flammable but burning slowly. It has important applications in industry, national defense, and medicine, such as making insulation materials, parachutes, artificial blood vessels, etc.

Raw silk is divided into twisted silk and bobbin silk according to the shape of the finished product. Twisted wire is a traditional form that has been used for a long time. The package of bobbin silk is large, well formed, and can save processes and improve quality during use.