1. Introduction
EVA Block material, as a widely used polymer material, its hardness properties have an important impact on the use effect and performance of the product. In many fields such as sports insoles, packaging materials, and shock-absorbing cushioning, the hardness properties of EVA Block materials play a key role. This report will conduct an in-depth analysis of the hardness performance of EVA Block materials based on EVA industry parameters.
2. Definition and importance of hardness of EVA Block material
Hardness refers to the ability of a material to resist external forces invading its surface. It is an indicator of the softness and hardness of a material. For EVA Block materials, hardness is directly related to its cushioning, support, wear resistance and other properties. The EVA Block material with moderate hardness can provide a stable buffering effect and reduce impact damage to the product; at the same time, it can also provide good support performance and maintain the stability of the product. In addition, hardness is closely related to the wear resistance and durability of EVA Block materials. Materials with moderate hardness are better able to resist wear and extend service life.
3. Measurement and evaluation method of EVA Block material hardness
The hardness of EVA Block material is usually measured by Shore hardness tester. The principle is to use an indenter to exert a certain pressure on the surface of the material, and to evaluate the hardness of the material by measuring the depth of the indenter pressed into the material. The Shore hardness tester has the advantages of simple operation and intuitive results. It is one of the commonly used methods to evaluate the hardness of EVA Block materials.
The hardness grade of EVA Block material is usually between 30 Shore A and 70 Shore A. EVA Block materials with different hardness levels have different performance characteristics and are suitable for different application scenarios. For example, EVA Block materials with lower hardness have better cushioning properties and are suitable for sports insoles, shock-proof buffering and other fields; while EVA Block materials with higher hardness have better support properties and wear resistance and are suitable for packaging materials , auto parts and other fields.
4. Factors affecting the hardness of EVA Block materials and control methods
The hardness of EVA Block material is affected by many factors, including raw materials, production processes, additives, etc. Among them, the selection of raw materials plays a decisive role in hardness performance. For example, the molecular weight and ethylene content of EVA resin will affect the hardness of EVA Block material. In terms of production process, parameters such as foaming temperature and pressure will also affect the hardness of EVA Block materials. In addition, the type and amount of additives will also have a certain regulatory effect on the hardness of EVA Block materials.
The control of the hardness of EVA Block materials can be achieved by adjusting raw materials, production processes and additives. For example, by selecting EVA resins with different molecular weights and ethylene contents, EVA Block materials with different hardnesses can be prepared. At the same time, optimizing the foaming process parameters, such as adjusting foaming temperature, pressure, etc., can also control the hardness of EVA Block materials. In addition, adding appropriate amounts of plasticizers, fillers and other additives can also adjust the hardness properties of EVA Block materials.
5. Analysis of application cases of EVA Block material hardness in different fields
Sports field: In sports insoles, EVA Block materials usually have lower hardness to provide better cushioning effect. For example, the EVA Block material hardness level of some sports insoles is around 40 Shore A, which can provide stable cushioning and support properties and reduce the impact of athletes during running, jumping and other sports.
Packaging field: Among packaging materials, EVA Block materials usually have moderate hardness to provide sufficient protection and cushioning effects. For example, the hardness level of the EVA Block material used in some electronic product packaging is around 50 Shore A, which can effectively reduce the vibration and impact of the product during transportation.
Other fields: In automotive parts, EVA Block materials usually have higher hardness to provide good support and wear resistance. For example, the EVA Block material used in some car floor mats has a hardness level of over 60 Shore A, which can withstand frequent stepping and friction and keep the floor mats clean and flat.
6. Conclusions and suggestions
The hardness properties of EVA Block materials have an important impact on its application effects and performance. By adjusting raw materials, production processes and additives, the hardness of EVA Block materials can be effectively controlled. According to the application requirements in different fields, EVA Block materials with suitable hardness levels should be selected. In the future, with the continuous advancement of science and technology and the continuous development of the market, we expect that EVA Block materials can achieve more breakthroughs and innovations in hardness performance and provide better performance for applications in various fields.