Main properties and technical classification of non-woven fabrics

The non-woven fabric breaks through the traditional textile principle. It is formed by directional or random arrangement of textile staple fibers or filaments to form a web structure, and then reinforced by thermal bonding, mechanical or chemical methods. It is formed without spinning and weaving, so the texture is light, soft, elastic, corrosion-resistant and washable.

1. Main properties of non-woven fabrics

Non-woven fabrics are made of filaments laid on each other to form a network, with high porosity, good light transmission and moisture permeability Strong, high air permeability, non-toxic and non-irritating characteristics. Generally, the humidity of the non-woven fabric coverage area will drop to about 60% as the sun rises to noon, which can effectively prevent condensation in the coverage area due to excessive humidity, alleviate the hazards of high temperature and strong light, and prevent low temperature frost damage and rejection. Water, windproof, pest-proof, non-combustion-supporting, dehumidifying. At the same time, the transmittance of non-woven fabrics for short-wave light is very high, while the transmittance of non-woven fabrics for long-wave light is lower than that of plastic films. Since the heat dissipation in the radiation area at night mainly depends on long-wave radiation, non-woven fabrics also have the advantages of comprehensively adjusting the environment such as temperature coordination. A new generation of environmentally friendly materials. The production speed of non-woven fabrics is fast, the process flow is short, the cost is low, the output is high, the raw material sources and uses are wide, and the colors are rich. Different colors of non-woven fabrics have different cooling and shading effects. The shading effect of yellow is better than blue and black is better than yellow .

2. Classification of non-woven technologies

Non-woven fabrics can be divided into various technologies according to their production processes:

First, needle-punched non-woven fabrics cloth. It is a kind of dry-laid non-woven fabric by using the puncturing action of the needle to consolidate the fluffy fiber web into a cloth;

Second, spunlace non-woven fabric. It is a process in which high-pressure fine water jets are sprayed onto one or more layers of fiber webs to entangle the fibers with each other to strengthen the fiber webs;

Third, wet-laid non-woven fabrics. It is to open the fiber raw materials placed in the water medium into single fibers, then mix different fiber raw materials to make fiber suspension pulp and transport it to the web-forming mechanism, and the fibers are formed into a web in a wet state and then reinforced into cloth;

Fourth, stitch-bonded non-woven fabrics. It is a non-woven fabric made by combining and reinforcing materials such as plastic sheets, plastic thin metal foils, yarn layers, and fiber webs by using a warp-knitted coil structure;

Fifth, heat-sealed non-woven fabrics. It refers to adding powdery or fibrous hot-melt bonding to the fiber web and then heating, melting and cooling to finally reinforce the material into a cloth;

Sixth, melt-blown non-woven fabric. It is to feed the polymer, and then melt extrusion until the fiber is formed, cooled, networked, and consolidated into a cloth;

Seventh, spunbond non-woven fabrics. It is to lay the continuous filaments formed by extruding and stretching the polymer into a fiber web, and then make the fiber web into a non-woven fabric through self-bonding, thermal bonding, chemical bonding or mechanical reinforcement;

Eighth, pulp airlaid non-woven fabric. It uses the air-laid technology to open the wood pulp fiberboard into a single fiber state, and then uses the air-laid method to condense the fibers on the web-forming curtain, and the fiber web is reinforced into a cloth.

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