bed sheet Expert: structure and properties of silk

 bed sheet Expert: structure and properties of silk

 

 

Silk composition and morphology: mainly composed of silk fibroin and silk gum, which are proteins. Silk protein fiber was strong, insoluble in water. In the silk fibroin content of about 70% -80% of total silk. Sericin content of about 20% -30%. Form part omitted.

The main performance characteristics of silk:

1), length: up to several hundred meters supreme kilometers.

2), hygroscopic: hygroscopic ability strong silk. Silk moisture regain up to 8% -9%. Tussah more than 10%, moisture reaches saturation up to 35% faster and lost speed. After the expansion of the absorbent fiber diameter increase of 65%. Since tussah more partial sectional level, the case of the fabric of local water droplets, fiber swelling due to moisture absorption, change the angle of the single fibers arranged in a fiber bundle or product in the bed linen, when light is irradiated to the fabric, it will form a reflection on the difference, from stains.

3), strength and elongation: strength greater than wool and silk cotton close. Silk elongation is less than more than cotton and wool. Elastic recovery is also less than wool and silk than cotton.

4) Chemical stability: silk can be hydrolyzed in acid-base damage, particularly resistance to alkali worse, when alkali hydrolysis that is extruded. Silk is also poor salt tolerance, neutral salts are typically easily absorb silk, silk so brittle.

5) optical properties: silk light is poor. UV irradiation causes fibroin tyrosine, tryptophan residues oxidative cleavage. Silk crisp pan color, strength decreased.

6), thermal properties: Silk Dry heat resistance strong, can long withstand 100 & # 176; C temperature. Silk is a poor conductor of heat, thermal conductivity is lower than cotton.

7), density: the density of small silk.

8), silk-ming: Issue dried or silk friction rub when specific clear faint sound, called silk-ming. Ming style features silk yarn has become unique.