Non-woven production process1

Non-woven production process

Non-woven fabrics are made of chemical fibers and plant fibers on wet or dry paper machines under the condition of using water or fresh air as a suspending medium Although it is cloth and not woven, it is called non-woven fabric. Non-woven fabric is a new generation of environmentally friendly materials, which has the advantages of good strength, breathable and waterproof, environmental protection, flexibility, non-toxic and tasteless, and low price. It is a new generation of environmentally friendly materials with the characteristics of water repellency, breathability, flexibility, non-combustion support, non-toxic and non-irritating, and rich colors. If the raw material is placed outdoors and decomposed naturally, its long life is only 90 days. When placed indoors, it will decompose within 8 years. It is non-toxic and harmless when burning, so it does not pollute the environment, so environmental protection comes from this.

Process flow of non-woven fabrics:

1. Made of polyester and polypropylene raw materials, through carding, combing, pre-needling, and main needling. A mesh interlayer is added in the center, and then double-tracked, air-laid and needle-punched to form a cloth. The post-press filter cloth has a three-dimensional structure and is heat-set.

2. After singeing, the surface layer is treated with chemical oil to make the surface of the filter cloth smooth, the micropores are evenly distributed, the density of the product is good from the surface layer, the surface of both sides is smooth and the air permeability is good, It has been proved by the filter on the plate and frame compressor. It can use high pressure and the filtration accuracy is within 4 microns. Two kinds of raw materials, polypropylene and polyester, can be given according to the user's needs.

3. Practical experience has proved that non-woven filter cloth has better performance in plate and frame filter press: for example, coal slime treatment in coal preparation plants, and wastewater treatment in iron and steel plants. Wastewater treatment in breweries, printing and dyeing plants. If other specifications of filter cloth are used, the filter cake will not be pressed dry and it will be difficult to fall off. After using non-woven filter cloth, the filter cake is quite dry when the filter pressure reaches 10kg-12kg, and the filter cake when the filter frame is opened. will fall off automatically. When users choose non-woven filter cloths, they mainly consider non-woven filter cloths of different thickness and quality based on air permeability, filtration accuracy, elongation, etc., and specifications and varieties can be formulated.

Non-woven manufacturers, needle-punched non-woven products are formed by fine carding, repeated precision needle punching or appropriate hot rolling treatment. Based on the introduction of two high-precision needle punching production lines at home and abroad, high-quality fibers are used. According to the coordination of different production processes and the matching of different raw materials, there are hundreds of different products circulating in the market at this stage.

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