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EVA related knowledge and data

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EVA related knowledge and data

EVA is a plastic material consisting of ethylene (E) and vinyl acetate (VA). The ratio of these two chemicals is adjustable to suit different application needs. The higher the content of VA content, the higher the transparency, softness and toughness. EVA and PEVA features are: 1, biodegradable: Discard or burn will not cause harm to the environment. 2, similar to the price of PVC: EVA is more expensive than virgin PVC, but relatively free from phthalates. 3, lighter weight: EVA density between 0.91 to 0.93, while PVC is 1.32. 4, odor-free: EVA does not contain ammonia or other organic odor. 5, excluding heavy metals: in line with the relevant international toys Ordinance (EN-71 Part 3 and ASTM-F963). 6, Phthalate-free: suitable for children's toys and will not produce plasticizers release danger. 7, high transparency, softness and toughness: a wide range of applications. 8, super low temperature (-70C): suitable for icy environment. 9, resistance to water, salt and other substances: In most applications can be 11, low fit temperature: can speed up the production speed. Maintain fixed. 10, high heat paste: can be firmly affixed to nylon, polyester, canvas and other cloth. 12, screen printing and offset printing: can be used for more fancy products (but must use EVA type ink). The main purpose (1) foam shoe material is the most important application of EVA resin in China. EVA resin used in shoe materials, vinyl acetate content is generally 15% to 22%. As the resin blend foam products with soft, good elasticity, chemical resistance and other properties, it is widely used in high-end sneakers, hiking shoes, slippers, sandals soles and interior materials. In addition, this material is also used in acoustical panels, gym mats and sealants. China's Shunde in Guangdong, Zhongshan, Fujian, Jinjiang, Quanzhou and Wenzhou, Zhejiang Province, China's footwear industry's main production base, consume a large amount of EVA resin products each year. In 1999, China's foamed shoe materials and cushioning area consumed a total of about 150 kt of EVA resin. (2) The main purpose of film EVA film is to produce functional film. Functional film has high weather resistance, anti-droplet and insulation properties, because polyethylene is not polar, even if the addition of a certain amount of anti-fog drops, the anti-droplet performance can only maintain about 2 months; and Adding a certain amount of EVA resin made of the greenhouse film, not only has a high transmittance, but also greatly improved drop-proof performance, generally more than 4 months. In addition, EVA can also be used for the production of packaging films, medical films, laminated films, casting films. In 1999, there are more than 50 enterprises that use EVA resin to process films in China. In 1999, a total of 800 kt of greenhouse film was produced in our country, including 220 kt of functional film and 30 kt of EVA resin, together with packaging film and medical film. In China, 37 kt of EVA resin was consumed in the field of film. (3) Wire and Cable With the continuous development of computer and network engineering, more and more people use halogen-free flame retardant cable and silane cross-linked cable for the sake of safety of the computer room. As EVA resin has good filler containment and cross-linkability, it is widely used in halogen-free flame retardant cable, semi-conductor shielded cable and two-step silane crosslinked cable. In addition, EVA resin is also used in the manufacture of some special cable jacket. EVA resin used in wire and cable, vinyl acetate content is generally 12% to 24%. In 1999, the wire and cable industry consumed a total of about 6,000 tons of EVA. (4) toys EVA resin in toys also have more applications, such as stroller wheels, cushions and so on. In recent years, the rapid development of China's toy processing industry, production and more concentrated in the coastal areas of Dongguan, Shenzhen, Shantou and other places, mainly in the export and external processing, in which small mushrooms sound mats again mats will be developed to a new height . According to the analysis, these manufacturers consume about 5,000 tons of EVA resin every year, and the materials used are the same as those of shoe materials. (5) Hot melt adhesive Hot melt adhesive with EVA resin as its main component is widely used in book binding, furniture sealing due to its high content of non-solvent, non-polluting environment and high safety. It is suitable for automated assembly line production. Edge, automobiles and home appliance assembly, shoemaking, carpet coatings and metal anti-corrosion coatings. Hot melt adhesive mainly uses vinyl acetate content of 25% to 40% of the species. Although the domestic product of this grade, but long-term production is not scheduled, so all the imported materials are owned. In 1999, the estimated consumption of EVA resin 17 kt in the field of hot-melt adhesives in China. (6) Other EVA resins are also widely used in the fields of ink, luggage, wine bottle covers, etc. It is estimated that these aspects consume EVA resin of not less than 15 kt.EVA injection foaming products


EVA foam products are widely used in various fields.




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