Application of TPU film sports shoes
TPU film has good processing properties such as injection, extrusion, calendering, blow molding, and molding. It is used in the three major shoe-making projects of soles, uppers, and lamination, and is favored by the majority of shoe manufacturers. From the picture below It can be seen that TPU covers almost the entire range of shoe manufacturing processes.
The application of TPU in sports shoes is mainly divided into three parts: upper, midsole and outsole.
1. Upper: TPU yarn, leather
Breathable flyknit uppers and waterproof leather uppers are common sneaker uppers. Among them, fly knitting means that the entire upper is woven in one piece. It can be woven with TPU yarn. It is soft and extremely durable. It has high wear resistance and is easy to perform hot pressing 3D shaping, solid shape, etc. In addition to yarn-woven uppers, TPU can also be made into synthetic leather and used in shoe uppers, decorative sheets, etc.
2. Shoe midsole: ETPU
Shoe midsoles are the most popular and mature component of TPU sports shoes. A common process is to make TPU into foam particles through a supercritical kettle foaming process, and combine it with water vapor or microwave molding to obtain ETPU shoe midsoles. Compared with traditional EVA midsoles, E-TPU shoe 糖心视频s have excellent resilience, extremely low compression permanent deformation, and a good wearing feel.
Then TPU insoles are also prepared through the foaming process. They are first foamed into sheets and then cut. Currently, there are still very few applications.
3. Shoe outsole: wear-resistant, anti-slip TPU
TPU can be used to obtain shoe outsoles through injection molding, which has the characteristics of wear resistance and high strength. In addition, the anti-slip effect is also one of the important indicators for judging the performance of TPU shoe outsoles.
In addition to the uppers, midsoles, and outsoles above, TPU's applications in sports shoes include anti-torsion sheets, heel sheaths, hot melt adhesives, TPU films, etc.
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