Multi-density EVA Block: Manufacturing process and application

  The production of multi-density EVA Block involves different process methods, and each process may have an impact on the performance of the final product. This article will introduce in detail the production process, numerical differences, application fields and advantages of multi-density EVA Block.

Dual density EVA foam


  Multi-layer pressing: EVA materials of different densities are stacked and pressed together layer by layer to form a multi-density block structure.

  Injection molding: During the injection molding process, density differences in different areas are achieved by controlling the flow and cross-linking of materials.

  Foaming process: By adjusting the amount of foaming agent and foaming conditions, EVA foam blocks with different density levels can be obtained.

  Different production processes will lead to the following differences:

  Density distribution: Different processes may produce different density distribution patterns, such as gradient density or local density.

  Mechanical properties: Changes in density will affect the mechanical properties such as hardness, elastic modulus and compressive strength of EVA Block.

  Sound and thermal insulation: Higher density areas generally have better sound and thermal insulation.

  Application fields and advantages:

  Sports equipment: Multi-density EVA Block can be used to make the midsole of sports shoes to provide better support and shock absorption. The density can be adjusted according to the needs of different parts. For example, the heel needs higher density to provide stability.

  Medical devices: In products such as prosthetics and mattresses, multi-density EVA Block can be designed according to ergonomics to provide comfortable support and pressure distribution.

  Automotive industry: used in car seats and interiors, multi-density design can meet comfort and safety requirements.

  Packaging materials: By setting higher density EVA Block in key parts, the protective performance of the packaging can be improved.

  For example, in the midsole of sports shoes, a multi-density EVA Block design is used. The density of the heel part may reach 0.4-0.6g/cm³, providing good support and stability; the density of the forefoot part is relatively low, about 0.2-0.4g/cm³ to increase flexibility and shock absorption.

  In summary, multi-density EVA Block achieves differentiation in material properties by controlling the manufacturing process. This characteristic makes it widely used in various fields and brings better performance and advantages to products. In actual applications, specific values and effects will be optimized and selected based on the design and needs of the product.

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