Dual-hardness EVA Block is formed by combining two EVA materials with different hardnesses through a special process. This process combines injection molding and milling processing technology to ensure that the two hardness EVA materials can be perfectly integrated at the joint without breakage or separation.
1. Process flow:
Material preparation: Choose two EVA blocks of different hardness.
Injection molding: First, the softer EVA material is injected into the mold to form the basic part of the insole.
Milling processing: On the basis of injection molding, a milling machine is used to mill the harder EVA material into the required shape and structure, such as support areas, cushioning points, etc.
Hot pressing bonding: The soft and hard EVA materials are closely bonded together under the action of a hot press.
Post-processing: such as punching holes for ventilation, trimming edges, etc., and finally completing the production of insoles.
2.Applications and uses of dual-hardness EVA Block
The design of dual-hardness EVA Block combines the advantages of soft and hard materials, which not only provides sufficient support, but also ensures comfort and cushioning effects. Therefore, it is particularly suitable for sports insoles that require high support and cushioning, such as basketball, running and other sports shoes.
3. Differences in parameters of splicing EVA Blocks with different hardnesses
The following are the parameter differences between two EVA Block insoles with different hardness splicing:
| Parameter | Split-Hardness EVA Block (A-Type) | Single-Hardness EVA Block (B-Type) | Difference Value |
| Soft Zone Hardness (Shore A) | 2月4日 | – | – |
| Hard Zone Hardness (Shore A) | 3月5日 | – | – |
| Overall Average Hardness (Shore A) | 2月19日 | 50 | 0 |
| Maximum Support Force (N) | 45 | 35 | 10 |
| Cushioning Efficiency (%) | 85 | 70 | 15 |
| Comfort Rating (1-10) | 8.5 | 7 | 1.5 |
4.Finally
Dual-hardness EVA Block combines softness and hardness to provide higher support and cushioning efficiency while increasing comfort. In insole manufacturing, this design can better adapt to different sports needs and provide athletes with better protection and experience. As consumers’ requirements for the performance of sports insoles increase, the application of dual-hardness EVA Block will become more widespread.