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The production process and principle of needle punched non-woven fabrics
The production process and principle of needle punched non-woven fabrics, speaking of non-woven fabrics, many friends know that this is a kind of fabric composed of fibers and has the same properties as cloth, but it has some properties that real fabrics do not have. Some of the characteristics of this non-woven fabric are that the material of this non-woven fabric is composed of polypropylene, and it can be moisture-proof, difficult to tear, and a series of characteristics that real cloth does not have. So today I will introduce how to make this kind of fabric. One of the methods of non-woven fabrics is the knitting method, which is to crochet the material of this non-woven fabric with a felting needle. The following editor will tell you in detail about the production process and principle of needle-punched non-woven fabrics.
The first step is needle punched non-woven fabrics made of polyester and polypropylene raw materials, which are carded, combed, pre-needled, and main needled. A mesh cloth interlayer is added in the center, and then double-layered, air-laid and needle-punched to form a cloth, and the filter cloth has a three-dimensional structure and is heat-set.
After the second step of singeing, the surface is most treated with chemical oil, so that the surface of the filter cloth is smooth and the micropores are evenly distributed. The density of the product is good from the surface, and the two surfaces are smooth and air-permeable. Well, it has been proved by the filter on the plate and frame compressor. It can use high pressure and the filtration accuracy is up to 4 microns. Two kinds of raw materials, polypropylene and polyester, can be provided according to user needs.
Practice has proved that non-woven filter cloth performs better in plate and frame filtration: 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 cloth, they mainly consider non-woven filter cloth of different thickness and quality according to air permeability, filtration accuracy, elongation, etc. For product parameters, please click polyester needled felt and polypropylene needled felt, the specifications and varieties are all. can be formulated.
Needle-punched non-woven products are formed by fine carding, repeated precision needling or proper hot rolling. Based on the introduction of two high-precision acupuncture production lines at home and abroad, high-quality fibers are selected. Through the coordination of different production processes and the matching of different materials, there are hundreds of different products currently on the market.
The main ones are: geotextile, geomembrane, velvet cloth, speaker blanket, electric blanket cotton, embroidery cotton, clothing cotton, Christmas handicrafts, artificial leather base cloth, special cloth for filter materials. Processing principle The production of non-woven fabrics by acupuncture is entirely through a mechanical action, that is, the puncture action of the needle of the acupuncture machine, and the fluffy fiber web is reinforced and cohesive to obtain strength.
Use the barbed barbs on the edges of the triangular section (or other sections) to puncture the fiber web repeatedly. As the barbs pass through the web, the surface and local inner fibers of the web are forced into the interior of the web. Due to the friction between the fibers, the originally fluffy web is compressed. When the needles exit the web, the pierced fiber bundles break away from the barbs and remain in the web, so that many fiber bundles are entangled in the web and can no longer be restored to its original fluffy state. After many times of needling, a considerable number of fiber bundles are stabbed into the web, so that the fibers in the web are entangled with each other, thereby forming a needle-punched nonwoven material with certain strength and thickness.
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