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- Working principle of EVA/rubber sole production line
- Material plasticization and mixing
EVA processing: EVA particles are dried (40-50℃) and heated to a molten state (150-180℃), and then injected into the mold under high pressure through a screw injection molding machine.
Rubber processing: Natural rubber needs to be plasticized first to reduce the molecular weight and increase plasticity, and then mixed with EVA or additives (roller temperature 90-110℃).
- Molding and foaming
Injection molding: Molten EVA is directly injected into the mold and cooled and molded once, which is suitable for soles with complex structures.
Molding foaming——
First molding: EVA particles are filled into the mold and foamed once.
Secondary molding: First foam into a sheet, cut and then heat-pressed for secondary shaping.
Vulcanization shaping: Rubber and vulcanizer are cross-linked under high temperature and high pressure to form a microporous structure.
- Composite process
Multi-color and multi-hardness technology: nested molds are layered to inject EVA of different hardness/color to achieve a gradient cushioning structure (such as sports shoe soles).
IP composite technology: rubber outsole and EVA midsole are directly cold-pressed and bonded, eliminating the glue process (peel strength increased by 30%).
- Features and advantages
Lightweight: EVA density is only 0.93 g/cm³, which is more than 30% lighter than rubber, reducing sports energy consumption.
High rebound and shock absorption: EVA rebound rate> 60%, absorbing impact (such as running shoe midsole); rubber is wear-resistant and non-slip (friction coefficient> 0.8).
Weather resistance: EVA is resistant to ultraviolet rays and low temperatures (no brittle cracking at -40℃), and rubber is oil-resistant and acid-resistant.
