Generally speaking, the printing process of non-woven bag production has screen printing or offset printing, and these two printing processes have no special changes to non-woven fabrics. For environmentally friendly ink printing, the printed pattern of the environmental protection bag will be washed away after washing. Non-woven fabric coating is a production process different from screen printing. Its characteristic is that the printed pattern can achieve photo-level effect and can print various complex color patterns. It covers the surface of the non-woven fabric with a layer of PP film, so that the non-woven fabric has also been greatly improved in firmness. At the same time, the non-woven fabric can also play a waterproof feature, and the printed pattern on the surface will not fade due to washing. Therefore, the actual role is this layer of film. The reason why the patterns of the environmentally friendly bags we usually use do not fade and are waterproof is largely due to its real role in this.