Down and feather detection

Wool dyeing

1. It is feasible to use low-temperature auxiliary agents miralan LTD and CTC-435 to dye wool at low temperatures. Low temperature dyeing at 80 ℃ can reach the level of conventional boiling dyeing, and the optimal dosage of both auxiliary agents is 2%

Main components

The main component of wool is keratin, which is composed of various α- Composed of amino acid residues, the latter can be linked into helical long chain molecules containing carboxyl, amino, and hydroxyl groups, forming salt and hydrogen bonds between molecules. Long chains are interconnected by disulfide bonds formed by cysteine. The above chemical structure determines the characteristics of wool. When the long chains of macromolecules in hair fibers are stretched by external forces α Spiral transition to β Type extension type, after external force is relieved, it returns to α Type, its appearance is characterized by excellent elongation, deformation, and resilience of wool. The strong moisture absorption ability of wool is related to some functional groups on the side chains. Wool is more acid resistant than alkali resistant because alkali easily decomposes the disulfide group in wool cystine, causing damage to the hair quality. Oxidants can also destroy disulfide groups and damage wool

Physical indicators

The physical property indicators of wool mainly include fineness, length, bending, strength and elongation, elasticity, felting, moisture absorption, color, and luster.

Wool shearing

Fineness is an important process characteristic that determines the quality and value of wool fibers, expressed in micrometers of fiber diameter or quality count; The smaller the fineness, the higher the count, and the finer the spun yarn. The length includes natural length and straight length, the former refers to the linear distance between the ends of the hair bundle, and the latter is the length measured by straightening the fiber. The elongation rate of fine hair is above 20%, and that of semi fine hair is about 10-20%. Under the same fineness, the longer the wool, the higher the spinning performance, and the better the quality of the finished product. Bending is widely used as a basis for evaluating the quality of wool. Wool with neat and consistent bending shapes, spun yarn and products have a soft feel, good elasticity, and warmth retention. Fine hair has a large number of bends and a high density, while coarse hair appears wavy or flat without bends. The strength and elongation have a direct impact on the firmness of the finished product. Strength refers to the stress of wool on fracture; Elongation refers to the increase in length due to the action of fracture force. There are significant differences in the breaking strength of various types of wool. The fineness of the same type of hair is directly proportional to its absolute strength, and the thicker the hair, the greater its strength. The more developed the medulla with medullary hair, the poorer its ability to resist breakage. The elongation of wool can generally reach 20-50%. Elasticity can maintain the original form of the product, which is an indispensable characteristic of carpets and blankets. Wool generally has excellent felting and moisture absorption properties. Gloss is often related to the scale coverage state on the surface of fibers, and fine hairs have weaker ability to reflect light, resulting in a softer luster; The luster of coarse fur is strong and shiny. Weak luster is often caused by damage to the scale layer