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Quality issues with the soles of sneakers
Li Ning's EVA is made of EVA's ethylene vinyl acetate copolymer, abbreviated as EVA, with a general content of vinyl acetate (VA) ranging from 5% to 40%. Compared with polyethylene, EVA has been widely used in fields such as foaming shoe materials, functional greenhouse films, packaging films, hot melt adhesives, electric cables, and toys due to the introduction of vinyl acetate monomer in the molecular chain, which reduces high crystallinity, improves flexibility, impact resistance, filler solubility, and thermal sealing performance. Generally speaking, the performance of EVA resin mainly depends on the content of vinyl acetate on the molecular chain. In 2001, the market consumption of EVA resin in China was approximately 290 kt. With the development of China's shoe industry and the increase in the amount of functional greenhouse film used, the demand for EVA resin in China will continue to increase year by year. Shoe materials are the main application field of EVA resin in China. In the EVA resin used in shoe materials, the content of vinyl acetate is generally between 15% and 22%. Due to the flexibility, good elasticity, and chemical corrosion resistance of EVA resin blended foam products, they are widely used in the soles and interior materials of mid to high-end tourism shoes, hiking shoes, slippers, and sandals. In addition, this material is also used in the fields of soundproof panels, gymnastics pads, and sealing materials. Shunde and Zhongshan in Guangdong, Jinjiang and Quanzhou in Fujian, and Wenzhou in Zhejiang are the main production bases of China's shoe industry, consuming a large amount of EVA resin products every year. In 1999, China consumed approximately 150 kt of EVA resin in the field of foam shoe materials and shock absorption