The production process of spunlaced non-woven fabrics, our knowledge of fabrics is becoming more and more barren, especially for the variety of fabrics, we certainly do not know spunlaced non-woven fabrics, I believe that many friends who are engaged in the processing and production of fabrics are familiar with spunlaced non-woven fabrics. Most of the fabrics are made of dense fibers, and spunlaced non-woven fabrics are no exception, however, it is made up of multi-layer fibers, and it contains a particularly wide range of fibers, and its raw materials are various.
The following small series introduces the production process of spunlaced non-woven fabrics. I. Spunlaced nonwoven process flow: A.
Fiber raw materials → loose mixing → combing → handing over * paving the net → drafting → Pre-wetting → positive and negative Spurs → finishing → Drying → winding the water treatment cycle B.
Fiber raw materials → Open Loose mixing → combing messy into a net → pre-wet → positive and negative Spurs → Post-finishing → Drying → winding ↑ water treatment cycle different ways of forming a net affect the vertical and horizontal strength ratio of the final product, process A has A good adjustment of the longitudinal and transverse strength ratio of the fiber mesh and is suitable for the production of spunlaced synthetic leather base cloth; Process B is suitable for the production of spunlaced sanitary materials.
Second, the pre-wet formed fiber net is sent to the spunlaced machine for reinforcement, first of all, pre-humidification treatment.
The purpose of pre-wetting is to compact the fluffy fiber net and remove the air from the fiber net, so that the fiber net can effectively absorb the energy of the water jet after entering the spunlaced area to enhance the fiber binding effect. Common pre-wetting methods: <>Double net clamping type <>
The hole roller and the net curtain are clamped. 3. The spunlace enters the spunlace area through the pre-wet fiber net. The water spray hole of the spunlace spray plate injects a plurality of fine water jet and shoots vertically into the fiber net.
The water jet causes a part of the surface fiber in the fiber net to be displaced, including vertical movement to the opposite side of the fiber net. When the water jet penetrates the fiber net, it is rebounded by the mesh curtain or drum, scatter to the opposite side of the fiber net in different directions.
Under the dual effects of direct impact of water jet and rebound of water flow, the fibers in the fiber network are displaced, interspersed, knotted and clasped to form countless flexible knotting points, so that the fiber net is reinforced.
The vertical injection of the water jet to the fiber mesh can prevent the destruction of the fiber mesh structure and maximize the energy of the water jet, which is conducive to improving the performance of the spunlaced nonwoven material.
There are three main forms of Spurs reinforcement: flat net Spurs reinforcement, drum Spurs reinforcement and Spurs reinforcement combined with drum and flat net.
The effect of the mesh curtain weaving structure and the fiber mesh appearance structure in the drum Spurs reinforcement process, the Spurs are arranged along the circumference of the drums, and the fiber mesh is adsorbed on the drums to accept the injection of the water jet ejected by the Spurs.
The fiber net is adsorbed on the drum, there is no deviation phenomenon, which is conducive to high-speed production. At the same time, the fiber net moves in a curved surface in the spunlaced area, accepts the spunlaced surface to relax, and the reverse side is compressed, which is beneficial to the water jet penetration, effectively tie the fiber.
The drum is a metal cylinder punching structure with a dewatering device, which has a good rebound effect on the water flow compared with the mesh curtain reinforced by the flat net spunlaced. (Three)
Spunlaced reinforcement combined with drum and flat net in the spunlaced reinforcement process, the combination of plane type and drum type can foster strengths and circumvent weaknesses and give full play to their respective advantages, usually the first and second levels are spunlaced Spurs, the third level is a flat net spunlace. (Four)
The number of Spurs and the number of Spurs commonly used in the hydraulic Spurs reinforcement process are 7 ~ 12, the commonly used water pressure is 60 ~ 250Bar, depending on the fiber network unit area quality, production speed, etc. , the spunlaced head pressure setting is usually low → high → low. (Five)
Structural analysis of water jet according to fluid mechanics, water is ejected from a water jet hole, which can be called a non-submerged free turbulent jet.
After the water jet is ejected from the water jet hole, due to the lateral pulsation of the turbulent jet and the friction resistance of the air convection beam, it gradually changes from the cluster jet to the scattered water droplets.
Fourth, the purpose of dehydration and dehydration is to remove the stranded water in the fiber net in time, so as not to affect the entanglement effect of the next Spurs.
When the amount of water retained in the fiber network is large, it will cause the dispersion of water jet Energy, which is not conducive to fiber entanglement.
After the end of the spunlaced process, the moisture in the fiber net is minimized, which is conducive to reducing the energy consumption of drying.
5. The water consumption of water treatment and circulating spunlaced nonwoven production process is very large. When the output reaches 5 tons/day, the water consumption per hour is about 150m3 ~ 160m3.
In order to save water and reduce production costs, about 95% of the water must be recycled after water treatment. (A)Water requirements for spunlaced nonwoven process <>
When the suspended matter content is high, the service life of the filter bag and filter element will be shortened. <>
Organic matter dissolved or colloidal dispersion tends to make water turbid and produce color.
These substances are easily deposited on the wall of the spray hole and adhere to the fiber, thus affecting the final whiteness of the product. <>
The rot slurry group formed by microorganisms will quickly block the water spray hole after being transported by a high-pressure water pump, causing the pressure of the Thorn Head to suddenly rise and stop in serious cases. <>
Inorganic salts dissolved in water, whether anion or cation, have an impact on the spunlaced process.
Calcium and magnesium ions generate dirt in pipelines and equipment. Iron, manganese and copper plasma are easy to generate colored substances. For the production of white sanitary materials, its content should be strictly controlled.
When the chloride ion content is high, it is easy to cause equipment corrosion.
All kinds of fibers are combined together, and the combination of multi-layer fibers is spunlaced non-woven fabrics, but this cannot be formally called spunlaced non-woven fabrics. It is called non-woven fabrics because it has not passed through textiles, instead, the textile process is turned into automatic injection.
The combination of various fibers through the spraying process enhances the durability of the fabric, thereby increasing the quality of the fabric.
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