EVA foam material

EVA is the fourth largest ethylene series polymer after HDPE, LDPE and LLDPE. Compared with traditional materials, its cost is much lower. Many people think that EVA foam material is the perfect combination of hard shell and soft shell, retaining the advantages of soft and hard foam while abandoning the disadvantages. Also, the inherent flexibility in material design and manufacturing capabilities is also a major factor in some of the world’s leading companies and brands turning to EVA foam when high-quality, low-cost manufacturing materials are required.

 

More than flexible, EVA foam material cares for our daily life and business activities, and has spawned the favor of end users. Footwear, pharmaceuticals, photovoltaic panels, sports and leisure products, toys, flooring/yoga mats, packaging, medical equipment, protective gear, wat

er sports products are in strong demand for durable plastic products, and the EVA foam material market segment continues to usher in new growth of.

丨EVA physical and mechanical properties

The properties of EVA copolymers are mainly determined by the vinyl acetate content and the degree of fluidity. The increase in VA content increases the density, transparency and flexibility of the material while reducing the melting point and hardness. Ethylene-vinyl acetate copolymer (EVA) is a very elastic material that can be sintered to form a rubber-like foam, but with excellent strength. It is three times more flexible than low density polyethylene (LDPE), has a tensile elongation of 750%, and has a maximum melting temperature of 96°C.

Depending on the ingredients in the production process, different degrees of EVA hardness can be achieved. It is important to maintain a moderate level of hardness because EVA does not regain its shape after continuous compression. Compared to harder EVA, softer EVA is less resistant to abrasion and has a shorter lifespan in the sole, but is more comfortable.

丨 EVA thermal properties

The melting point of EVA decreases with the increase of VA content. Therefore, the use temperature of the copolymer is lower compared to the corresponding homopolymer (LDPE). The maximum working temperature of the workpiece is less than the temperature of softening Vicat. As with all thermoplastic polymers, temperature depends on the duration and level of mechanical stress to which the workpiece is subjected to heat. As the temperature increases, the conductivity temperature decreases until it reaches a plateau close to the melting point.

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Post time: Sep-23-2022