Milled EVA (ethylene-vinyl acetate copolymer) blocks are widely used in the manufacture of various insoles due to their excellent cushioning, resilience and plasticity. These insoles are not only common in sports shoes and casual shoes, but are also widely used in medical orthopedic insoles, customized insoles and other fields.
Differences in production technology and processes
Sports insoles
Process flow:
Material preparation: Select EVA blocks of appropriate hardness and thickness.
Milling processing: According to the insole design, a milling machine is used for preliminary shape processing.
Hot pressing: The insoles are hot pressed at high temperatures to make them fit the shoe shape better.
Perforated ventilation: In order to increase the breathability of the insole, holes are usually punched in the insole.
Features: Sports insoles are usually designed with cushioning areas, support areas, etc. to provide support and cushioning for the foot in different motion states.
Medical orthotic insoles
Process flow:
Material preparation: Choose softer EVA blocks to adapt to different foot shapes.
Customized design: Personalized design based on the patient’s foot condition.
Milling: Precisely milled as designed to ensure a perfect fit between the insole and your foot.
Fine-tuning and testing: Fine-tuning is performed during actual use to ensure the correction effect.
Features: Medical orthotic insoles focus on individual differences and are designed to correct foot abnormalities, relieve foot pain, and improve walking posture.
Customized insoles
Process flow:
Measurement and modeling: Use professional equipment to measure foot size and build a 3D model.
Design optimization: Design the most suitable insole shape based on the foot model.
Milling processing: Use high-precision milling machines to process according to the design.
Finished product inspection: Make sure the insole matches the foot model perfectly.
Features: Customized insoles emphasize personalized experience and can provide exclusive support and comfort according to each person’s foot shape and gait.
Differences in performance parameters between different insoles
| Insole Type | Thickness (mm) | Hardness (Shore A) | Rebound Elasticity (%) | Breathability | Customizability |
| Sports Insole | 5-15 | 40-60 | 80-95 | Good | Moderate |
| Medical Orthotic Insole | 3-10 | 20-40 | 70-85 | Moderate | High |
| Custom Insole | 3-20 | 20-70 | 75-95 | Excellent | Extremely High |
Summary
After EVA blocks are milled, various types of insoles can be made to meet the needs of different fields. From the cushioning and support of sports insoles, to the personalized correction of medical corrective insoles, to the exclusive experience of customized insoles, the wide application and unique advantages of EVA materials in insole manufacturing are reflected. With the continuous advancement of technology, we have reason to believe that EVA materials will play a greater role in the field of insole manufacturing, bringing people a more comfortable and healthy wearing experience.