TPU is synthesized from isocyanate and polyol. The isocyanate gives the strength of the TPU material, and the polyol gives the flexibility of the TPU material. With different formulations of raw materials, the hardness of TPU can be adjusted, and TPU has excellent wear resistance, which is very suitable for shoemaking.
Outsole: The outermost layer of sole that touches the ground is called the outsole. The most important requirements for the outsole are non-slip and wear-resistant. Traditional shoe outsoles are made of rubber or EVA. Due to the wear resistance of TPU, it has gradually taken a place in the outsole.
Air cushion: Sports shoes pursue high resilience and high shock absorption effect. The air cushion is located between the upper part of the shoe sole and the lower part of the shoe sole. It is a hollow air storage cavity that can store and press out air. The air storage cavity and the air inlet and outlet channels arranged on the shoe form a ventilation device. Air-cushioned shoes with air cushions are very light to wear and can slow down sports injuries. Air cushion shoes were first invented by Nike, and today, there are many types of air cushions. From the material point of view, PU, PVC and TPU are most commonly used. The mechanical strength and hardness of TPU can be flexibly adjusted to adapt to the requirements of air cushions. In addition, TPU can be very transparent, increasing the aesthetics of air cushions and shoes.
Upper: Usually the upper material is multi-layer composite. TPU hot melt adhesive film is widely used for composite bonding between layers.
The hot melt adhesive film is a thin layer of TPU film, which is sandwiched between two layers of fabrics, heated with a hot laminator, the TPU is melted and then solidified, and the fabrics are firmly bonded together. TPU hot melt adhesive for shoe uppers is simple to operate and easy to construct, which greatly improves the production efficiency of shoes; and compared with traditional solvent-based adhesives, TPU hot melt adhesive has 100% solid content and no voc emissions, regardless of the production of shoes The process or the wearing process will not harm the human body and the environment.
Shoe trim: the bright decorative sheet on the shoes, available in PVC, TPU and other materials. TPU can be transparent and easy to be painted in various colors, which can easily produce colorful and bright shoe decoration materials.
Upper: Usually the upper material is multi-layer composite. TPU hot melt adhesive film is widely used for composite bonding between layers.
Shoelaces: Shoelaces not only tighten the shoes, but also have decorative adjustments. TPU shoelaces are lightweight, waterproof, dirt-resistant and easy to clean. More importantly, TPU has a certain degree of elasticity. You only need to adjust the TPU shoelace to a comfortable tightness and fasten it once. There is no need to untie or re-tie your shoes afterwards. Put on the shoelaces. Shorten time and reduce trouble.
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