Commonness And Characteristics Of Wool And Silk

　　 wool The main physical characteristics are slender, length Strength, elongation and suction Wetness And so on.

Silk hand touch soft and elastic, refining degumming silk after training, the surface is smooth and uniform, clean and elegant. Silk is a porous protein fiber with good moisture absorption, moisture dissipation and gas and air permeability. The limbs are soft and comfortable, with unique characteristics of "Silk singing".

The strength of the silk is high, the breaking strength can reach 3.1~3.6dN/tex (3.50~4.09gf/ Dan), the elongation of fracture can reach 15~25%, and the cutting strength of unit cross-sectional area reaches 432.1~471.4N/mm2 (44~48kgf/mm2), which is close to that of steel wire. The wear resistance of silk is superior to that of other natural fibers. 22.2/24.42dtex (20/22 Dan) 4A has about 80 times of raw silk package and strength.

The heat resistance of silk is good, its decomposition point is about 150 degrees Celsius. At the same time, the silk has good warmth retention and feels warm in winter and cool in summer.

Silk insulation is good, it is a poor conductor of electricity. But when the moisture regain is high, it will reduce resistance and reduce insulation performance. In general, the moisture regain of silk fiber is 8%~14%.

Silk dyeing is good. It can be dyed with direct dyes, acid dyes, reactive dyes and mordant dyes. Alkaline dyes need protective agents. The dyeing effect is beautiful, bright and delicate.

The resistance of silk to acid is stronger than that of cotton and weaker than wool. With the increase of concentration and temperature, silk fibers stop swelling and dissolve. Caustic soda can dissolve sericin and damage silk fibroin even at low temperature.