How EVA foam sheet is made?

EVA (Ethylene-vinyl acetate) foam is a versatile material that finds application in various industries due to its unique properties. The production of EVA foam sheet involves several steps, beginning with the raw materials and culminating in the finished foam sheets or rolls.

1. Raw Material Preparation: 

The production process starts with the mixing of ethylene and vinyl acetate in specific ratios including EVA, POE, Rubber, etc.., typically using a reactor under controlled conditions. The resulting copolymer is then blended with various additives, including foaming agents, colorants, and stabilizers, to enhance specific properties of the foam.

2. Extrusion Process: 

The blended EVA compound is then fed into an extruder, where it is melted and mixed further to form a homogenous material. During this stage, any additional desired properties, such as flame resistance or enhanced flexibility, can be incorporated into the mixture.

3. Foaming and Expansion:

Once the compound is adequately mixed, it is fed into a specialized foaming extruder. Through the addition of blowing agents and controlled pressure, the material undergoes expansion and forms a cellular structure. This results in the creation of foam, giving it its distinctive lightweight and spongy characteristics.

4. Calendering or Cutting: 

The expanded EVA foam material is then typically calendered into sheets or cut into rolls, depending on the intended application. Calendering involves passing the foam through rollers to achieve the desired thickness, while cutting provides flexibility in creating various shapes and dimensions.

Advantages of EVA Foam:

1.Cushioning and Shock Absorption: 

EVA foam is known for its excellent cushioning properties, making it ideal for applications such as sports padding, footwear, and protective packaging.

2. Flexibility and Durability: 

This material maintains its flexibility across a wide temperature range and is resistant to cracking, making it suitable for long-term use in diverse environments.

3. Chemical Resistance:

 EVA foam exhibits resistance to various chemicals, oils, and solvents, enhancing its utility in industrial settings.

4. Insulation: 

It provides thermal and electrical insulation, making it valuable in applications requiring these properties.

5. Sound Dampening: 

EVA foam's cellular structure enables it to dampen sound, making it suitable for use in acoustic insulation.

6. Buoyancy: 

The material's lightweight nature and water resistance make it suitable for flotation devices and marine applications.

Overall, the production process of EVA foam sheet or rolli nvolves precise control over various parameters to achieve the desired foam characteristics, and its unique properties make it a valuable material in both industrial and consumer applications, ranging from industrial gaskets and seals to comfortable shoe insoles and cushioning materials.   

Shunho Foam solution has been manufacturing EVA foam sheets/rolls with over 10 years experiences. We provide one stop service including foaming, cutting, milling, lamination. welcome to visit our plant. We will convince you with our quality and service. Please contact us by sales@shunhogroup.com.hk