Woolen sweater is a favorite clothing fabric. It can provide very warm temperature in winter and has excellent thermal insulation performance. However, due to the shortcomings of wool, many friends are not sure whether the sweater they buy is a high-quality product. Let's have a look. Woolen sweaters shed badly. Is it inferior Maybe the sweater will lose hair, but it won't lose all the time. Shedding and pilling of wool products are normal phenomena. Wool is a natural fiber with different weaving methods and different pilling degrees. For a better sweater, the excess fiber will be much better after falling off, and the wool will not fall off all the time. If hair loss is severe, you can apply for after-sales service. Why do woolen sweaters shed fluff 1. Wool fiber will break after a long time of wear, which is one of the reasons for wool loss of sweater. 2. Improper cleaning will destroy the protein structure of the sweater, make the wool of the sweater fragile and lose its softness, and the tensile force of the fiber becomes poor and easy to break. 3. In order to pursue the soft hand feel of sweaters, manufacturers will reduce the rolling degree of knitting, short wool fiber and insufficient holding force, resulting in hair loss. Why can't woolen sweaters be machine washed During machine washing, a large mechanical force will be generated. Under the influence of this external force, the wool sweater will have serious deformation, and the fabric is also easy to be damaged, which will lead to scrapping. Wash the sweater by hand gently, don't soak it for a long time, and don't wash it with washing powder and other materials. Mild detergent is OK. Now there is a special wool laundry detergent. Don't expose yourself to the sun when drying. Spread it flat to dry or use a net bag to dry it. What if the sweater shrinks 1. Steam ironing: the shrunk sweater fiber is heated with a steam iron, and then the fiber can be elongated with both hands while it is hot. 2. Thick cardboard: cut the thick cardboard into the size and shape of the original sweater, and polish the cut with sandpaper to avoid damaging the sweater. 3. Put the sweater on the cardboard and fix the lower foot with several clothes clips. 4. Then use an electric iron to steam iron each part of the sweater repeatedly, and remove it after it is completely cooled