The use of EVA material is very extensive. For example, we use EVA foaming material to make insoles. Today’s topic of discussion is the different foaming methods for EVA.
There are several different foaming methods for Ethylene-vinyl acetate (EVA). Here are some of the main methods:
1. Chemical Foaming
In this method, a chemical blowing agent is added to the EVA resin. When the resin is heated during the manufacturing process, the blowing agent decomposes and releases gas, creating bubbles within the material. The foam expands and solidifies as it cools.
2. Physical Foaming
This method involves the use of physical blowing agents, such as liquid or gaseous substances, to introduce gas into the EVA resin. These blowing agents are typically injected into the resin under high pressure. When the pressure is released, the blowing agent expands and forms bubbles, resulting in foaming.
3. Compression Molding
Compression molding is a technique where the EVA resin is placed into a mold cavity and compressed under heat and pressure. The heat causes the resin to melt and flow into the mold cavity, while the pressure helps to distribute the resin evenly and create a uniform foam structure.
4. Injection Molding
Injection molding involves injecting molten EVA resin into a mold under high pressure. The heat and pressure cause the resin to fill the mold cavity and form a solid foam structure. This method is commonly used for producing complex shapes and designs.
5. Extrusion
Extrusion is a continuous process where the EVA resin is melted and forced through a die to form a continuous profile. In the case of EVA foam, the extrusion process is combined with foaming agents to create a foam structure. The extruded foam is then cooled and cut into desired lengths.
The main foaming methods for EVA are as follows. If you are interested in EVA foaming materials, you can contact us or visit this page (https://www.aideastep.com/eva-blocks-top-covers-for-cad-cam-milling/) to know more. We are a manufacturer of EVA, and we can customize the size, density, length, width, height, color, hardness, and other attributes of EVA foam.