The selected felt is also different. The felt products have different requirements on the raw material composition according to the use, type and nature. For example, the filter felt requires high filtration efficiency and no lint when filtering gasoline. Therefore, it is required that there is no dead hair in the composition of the mixture, low impurity content, fine hair fiber, high degree of curl, and good milling property. In another example, shoe felt is used to padded cotton soles or used in cotton shoes. The felt is required to have good warmth retention and low price, but the color requirements are not high. Therefore, the color and the color are not considered when selecting the ingredients of the mixture. Black hair and white hair can be used. Generally, all kinds of miscellaneous hairs are used for production.
