Production process of spunlace non-woven fabric

Spunlace non-woven fabric process/process 1. Spunlace non-woven fabric process: A. Fiber raw material→opening and blending→carding→cross*laying→drafting→pre-wetting→positive and negative spunlace→finishing→drying Drying → winding ↑ ↑ water treatment cycle B. Fiber raw material → opening and mixing → combing messy netting → pre-wetting → positive and negative spunlace → finishing → drying → winding ↑ ↑ water treatment cycle different netting methods affect the final The vertical and horizontal strength ratio of the product. Process A has better adjustment of the fiber web vertical and horizontal strength ratio, which is suitable for the production of spunlace synthetic leather base fabric; Process B is suitable for the production of spunlace sanitary materials. 2. Pre-wetting The formed fiber web is sent to the spunlace machine for reinforcement, and the first is pre-wetting treatment. The purpose of pre-wetting is to compact the fluffy web and remove the air in the web, so that the web can effectively absorb the energy of the water jet after entering the spunlace area to enhance the fiber entanglement effect. Common pre-wetting methods: u003cu003e Double-wire clamping type u003cu003e Perforated drum and mesh curtain clamping type 3. The spunlace enters the spunlace area through the pre-wet fiber web, and the spunlace head sprays the water jet hole spray A number of fine water jets are emitted, which are directed towards the fiber web vertically. The water jet displaces part of the surface fibers in the fiber web, including vertical movement to the opposite side of the fiber web. When the water jet penetrates the fiber web, it is rebounded by the net curtain or the rotating drum and scattered to the fiber web in different directions. The opposite. Under the dual action of the direct impact of the water jet and the rebound water flow, the fibers in the fiber web are displaced, interleaved, entangled, and entangled, forming countless flexible entanglement points, thereby strengthening the fiber web. The vertical jet of water jet on the fiber web can prevent damage to the fiber web structure and utilize the energy of the water jet to the greatest extent, which is beneficial to improve the performance of the spunlace non-woven fabric material. The spunlace reinforcement methods mainly include flat net spunlace reinforcement, rotary drum spunlace reinforcement, and spunlace reinforcement combining rotary drum and flat net. The weaving structure of the net curtain and the appearance structure effect of the fiber mesh In the rotating drum spunlace reinforcement process, the spunlace heads are arranged along the circumference of the rotating drum, and the fiber mesh is adsorbed on the rotating drum and is sprayed by the water jet from the spunlace head. The fiber web is adsorbed on the drum, and there is no deviation phenomenon, which is conducive to high-speed production. At the same time, the fiber web moves in a curved surface in the spunlace zone. The spunlace surface is relaxed and the reverse surface is compressed. This is conducive to the penetration of the water jet and effectively Tangled fibers. The drum is a metal cylindrical perforated structure with a dewatering device inside. Compared with the flat net spunlace reinforced net curtain, it has a good rebound effect on water flow. (3) Spunlace reinforcement combined with rotating drum and flat net. In the non-woven spunlace reinforcement process, the combination of flat and rotating drums can maximize strengths and avoid weaknesses and give play to their respective advantages. Usually the first and second stages are rotating Drum type spunlace, the third level is flat net type spunlace. (4) The number of spunlace heads and the number of spunlace heads commonly used in the hydraulic spunlace reinforcement process is 7~12, and the common water pressure is 60~250Bar, depending on the quality of fiber per unit area and production speed. Spunlace heads The pressure setting is usually low→high→low. (5) Structural analysis of water jet According to fluid mechanics, water sprayed from the water jet hole can be called a non-submerged free turbulent jet. After the water jet is ejected from the spray hole, due to the lateral pulsation of the turbulent jet and the frictional resistance of the air convection, it gradually transforms from the clustered jet to the scattered droplets. 4. Dehydration The purpose of dehydration is to remove the retained water in the fiber web in time, so as not to affect the tangling effect during the spunlace. When the amount of water retained in the fiber web is large, it will cause the dispersion of the water jet energy, which is not conducive to fiber entanglement. After the spunlace process is completed, the moisture in the fiber web is reduced to a minimum, which is beneficial to reduce drying energy consumption. 5. Water treatment and recycling Spunlace non-woven fabric production process consumes a lot of water. When the output reaches 5 tons/day, water consumption is about 150m3~160m3 per hour. In order to save water and reduce production costs, about 95% of the water must be recycled after water treatment.