What are the classifications of non-woven fabrics according to the production process

The fibers used in the production of non-woven fabrics are mainly polypropylene (PP) and polyester (PET). In addition, there are nylon (PA), viscose fiber, acrylic fiber, polyethylene fiber (HDPE), and chlorine fiber (PVC). According to application requirements, non-woven fabrics are divided into two categories: disposable application type and durable type. According to the production process, it is divided into: 1. Spunlace non-woven fabric: The spunlace process is to spray high-pressure fine water flow onto one or more layers of fiber webs to entangle the fibers with each other, so that the fiber webs can be reinforced and have a certain strength. 2. Thermally bonded non-woven fabric: Thermally bonded non-woven fabric refers to the addition of fibrous or powdery hot-melt adhesive reinforcement materials to the fiber web, and the fiber web is heated, melted and cooled to be consolidated into a fabric. 3. Pulp air-laid non-woven fabric: Air-laid non-woven fabric can also be called dust-free paper and dry paper-making non-woven fabric. It uses air-laid technology to open the wood pulp fiberboard into a single fiber state, and then uses the air-flow method to agglomerate the fibers on the web curtain, and then strengthen the fiber web into a cloth. 4. Wet-laid non-woven fabrics: Wet-laid non-woven fabrics are used to open fiber raw materials placed in an aqueous medium into single fibers, and at the same time mix different fiber raw materials to form a fiber suspension slurry, which is transported to the web forming mechanism, and the fibers are In the wet state, a net is formed and then reinforced into a cloth. 5. Spunbond non-woven fabric: Spunbond non-woven fabric is formed after the polymer has been extruded and stretched to form continuous filaments, the filaments are laid into a web, and the web is bonded by itself, thermally bonded, and chemically bonded. Or mechanical reinforcement method to make the web into a non-woven fabric. 6. Melt-blown non-woven fabric: The process of melt-blown non-woven fabric: polymer feeding---melt extrusion---fiber formation---fiber cooling---web formation---reinforcement into fabric. 7. Needle-punched non-woven fabrics: Needle-punched non-woven fabrics are a kind of dry-laid non-woven fabrics. Needle-punched non-woven fabrics use the puncture effect of needles to reinforce the fluffy web into a fabric. 8. Stitched non-woven fabric: Stitched non-woven fabric is a kind of dry non-woven fabric. The stitching method uses the warp-knitted loop structure to align the fiber web, yarn layer, and non-woven materials (such as plastic sheet, plastic thin metal foil). Etc.) or their combination to be reinforced to make a non-woven fabric. 9. Hydrophilic non-woven fabric: mainly used in the production of medical and sanitary materials to achieve better hand feeling and not scratch the skin. For example, sanitary napkins and sanitary pads use the hydrophilic function of hydrophilic non-woven fabric. Non-woven fabric (English name: Non Woven Fabric or Nonwoven cloth), also known as non-woven fabric, is composed of directional or random fibers. It is a new generation of environmentally friendly materials. It is moisture-proof, breathable, flexible, light, non-combustible, and easy to decompose. , Non-toxic, non-irritating, rich in color, low price, recyclable and so on. For example, polypropylene (PP material) pellets are mostly used as raw materials, which are produced by continuous one-step method of high-temperature melting, spinning, laying, and hot-pressing. It is called cloth because of its appearance and certain properties. Advantages: 1. Lightweight: Polypropylene resin is used as the main raw material for production. The specific gravity is only 0.9, which is only three-fifths of cotton. It is fluffy and feels good. 2. Soft: It is composed of fine fibers (2-3D) and is formed by light-point hot-melt bonding. The finished product is moderately soft and comfortable. 3. Water-repellent and breathable: Polypropylene slices do not absorb water, have zero moisture content, and have good water-repellent properties. They are made of 100% fiber and are porous and air-permeable. It is easy to keep the cloth dry and easy to wash. 4. Non-toxic, non-irritating: The product is produced with FDA food-grade raw materials, does not contain other chemical components, has stable performance, is non-toxic, non-odor, and does not irritate the skin. 5. Antibacterial and anti-chemical agents: Polypropylene is a chemically blunt substance, not moth-eaten, and can isolate the corrosion of bacteria and insects in the liquid; antibacterial, alkali corrosion, and the strength of the finished product will not be affected by erosion. 6. Antibacterial. The product is water-repellent, not moldy, and can isolate the bacteria and insects in the liquid from erosion, and is not moldy. 7. Good physical properties. It is made of polypropylene spun silk directly spread into a net and thermally bonded. The strength of the product is better than that of ordinary staple fiber products. 8. In terms of environmental protection, the raw material of most of the non-woven fabrics used is polypropylene, while the raw material of plastic bags is polyethylene. Although the names of the two substances are similar, their chemical structures are far apart. The chemical molecular structure of polyethylene is very stable and extremely difficult to decompose, so it takes 300 years for plastic bags to be decomposed; while the chemical structure of polypropylene is not strong, the molecular chain can easily be broken, which can be effectively degraded , And enter the next environmental cycle in a non-toxic form, a non-woven shopping bag can be completely decomposed within 90 days. Moreover, the non-woven shopping bag can be reused more than 10 times, and the pollution to the environment after being discarded is only 10% of that of plastic bags. Disadvantages: 1) Compared with textile fabrics, the strength and durability are poor. 2) It cannot be washed like other fabrics. 3) The fibers are arranged in a certain direction, so it is easy to split from the right angle direction and so on. Therefore, the improvement of the production method mainly focuses on the improvement of preventing splitting.