1. You can see the length of the fluff on the surface of cashmere sweater

The surface of a real cashmere sweater has a layer of fluff about 1 cm long, which is neat, flat and even from left to right.

2. You can touch the real cashmere.

Wool has thick scales and large warpage, so it will feel prickly. Some sweaters are slippery to the touch, and they still feel slippery when rubbed with your fingers, which may be due to the addition of slip-increasing substances to cover up the prickle.

Cashmere fiber has a large number of coils, coils and coil recovery rate, which is suitable for processing into plump, soft, elastic knitwear with good shrinkage characteristics. Holding a cashmere sweater, a high-quality sweater will make you feel very elastic and will soon return to the level of wrinkle resistance.

3. Burning and disinfectant 84 can be distinguished.

When the burning speed of cashmere fiber is slow, it will give off the smell of burning hair, and the ash is crisp black coke, which will be broken when touched. If the cashmere sweater is made of acrylic fiber, it will burn without the burning smell of hair.

Another method is dissolution. Sheep wool and cashmere are protein fibers, which have poor alkali resistance and can be dissolved in 84 disinfectant or sodium hypochlorite solution.

Extended information:

Tissue structure

1. Scale layer:

Scale layer is the surface layer of wool, and it grows in a certain direction. From the hairy root to the hairy tip, each scale is connected with the skin layer at the hairy root end, and the other end extends outward to form a covering connection. The coverage density of scales on different varieties of wool varies greatly. The finer the wool, the more scales there are, the longer the overlapping part is, and the more annular the scales are.

The thicker the wool is, the fewer the scales are, the shorter the overlapping length is, and the scales are mostly corrugated and covered with fish scales. Because the scale layer protrudes outward, if the friction between fibers is increased, the interaction will produce felt contraction, which will enhance the grip under hot and humid conditions. Scales also give wool a good luster. The hard scale structure makes wool resistant to friction and pollution.

2. Cortical layer:

Cortical layer is the main component of wool fiber. It is made up of many protein cells, called keratin or keratin. These cells combine with each other, and there are gaps between them. The cortex is the main part that determines the physical, mechanical and chemical properties of wool fiber. It is divided into two types: positive cortex and paracortical cortex.

In the curly wool fiber, it can be straightened and extended to about 2% after stretching, and can be restored to the original curled state after relaxation.

The cells outside the curl are called cortical positive cells, and the cells inside the curl are called paracortical cells. The sulfur content of positive cortex is lower than that of accessory cortex, so its chemical properties are more active and easy to stain. Paracortical is the opposite. In fine wool of fine varieties, two kinds of cortical cells gather on both sides of the hair shaft and intertwine along the fiber axis, which is called bilateral isomerization.

3. Medullary layer:

Medullary layer is an opaque loose substance located in the center of wool fiber. Generally, fine hairs have no medullary layer, while coarse hairs have different degrees of medullary layer. The finer the wool, the straighter and rougher the appearance of wool, and the worse the quality. Wool contains a large pulp, which is fragile and less curly. When it is dry, it is called dead hair.

some wool has discontinuous pith, and there are fine hairs and coarse hairs on one fiber. This kind of wool is called double wool.