Performance And Technical Requirements Of Cotton Lining

　 （1） Properties of cotton lining

Cotton fiber is a kind of single-cell cellulose fiber. One cell is one fiber. The main component of cotton fiber is cellulose. In addition, there are fat, sugar, ash and some water-soluble substances, Cotton lining It has all the characteristics of cotton fiber.

1. Strength The strength of cotton lining mainly depends on the length and twist number of cotton fiber. The longer the fiber length is, the greater the twist number is. The strength is relatively larger. The woven finished product has good fastness and wear resistance. The strength of cotton lining is better than that of man-made fiber lining, but worse than other fiber dimensions.

2. The elasticity of elastic cotton fiber is poor, so the cotton lining is easy to wrinkle.

3. Hygroscopic cotton fiber is a porous material with large hydrophilic structure in its molecule, so it has good hygroscopicity and permeability, and the lining made of it is soft and comfortable.

4. The warm cotton fiber is a poor conductor filled with tears. The inner cavity of the cotton fiber is full of stagnant air, so the warm cotton lining performance Good, good wearing performance.

5. The dyed cotton lining has good dyeing performance, bright color, complete color spectrum, and can match with various fabrics.

6. Other properties The cotton lining has poor alkali resistance and acid resistance, and good heat resistance and light resistance.

　 （2） Technical requirements for cotton lining

1. Width. Width within 100cm: allowable deviation - 1.0cm~+2.0cm. The width is 100~140cm: the allowable deviation is - 1.5cm~+2.5cm. Width above 140cm: the allowable deviation is - 2.0cm~+3.0cm.

2. Density. For fabrics not subject to major finishing, the allowable deviation is – 1.5%. Large finished preshrunk and raised fabrics: the allowable deviation is – 2.5%. (Note: No assessment will be made after being sealed, but no arbitrary change is allowed after the total number is specified).

3. Color fastness. Soaking fastness, vat dye: fade 3 grade as is; Level 4 for white cloth staining. Other dyes: original fading grade 3; Level 3 for white cloth staining. Vulcanized blue: Grade 3 fading as is; Level 2-3 for white cloth staining. Abrasion fastness, vat dye: dry rub grade 3-4; Wet friction grade 3. Other dyes: dry friction grade 3; Wet friction grade 2. Sulfide blue: dry friction grade 3; Wet friction grade 2.

4. Shrinkage rate. Large finished and pre shrunk fabrics: warp direction shall not be less than – 5%; Not less than – 5% in latitude. technology Standard large finished fabric: warp direction not less than – 6%; Not less than – 5% in latitude.