Characters Of Supercritical Microcellular EVP Foam
EVP is based on traditional EVA materials to greatly optimize and upgrade the smell and recycled. The process uses physical foaming, no chemical reaction, no VOC production, non-flavor harmless and environmentally friendly products, biodegradable.
Never use environmentally harmful additives such as butane, fluoride, AC blowing agent, no formamide, and no toxic or volatile chemical substances, 100% physical nitrogen. The specific technical parameters of the equipment can be customized according to customer needs.
Why Supercritical Microcellular EVP Foam Become Popular
Chemical foam is easy to decompose and produces by-products, resulting in odors and color deviations. Physical foaming technology can effectively avoid the above problems. Therefore, our company has specially developed microcellular foam by supercritical technology (Nitrogen+Polypropylene) that is halogen-free, amine-free, odorless, and able to pass VOC and TVOC.
Environmental protection: can pass RoHs, REACH, halogen. Nowadays, foam is widely used in automobiles, home appliances, electronics, aviation, motor cars, ships, and other industries.
Products containing amines have strong irritation to the skin, easily causing conjunctivitis, bronchitis, pneumonia, and pulmonary edema, and damages the liver and kidneys. Long-term touching products containing amines can cause occupational effects. Therefore, many large international companies are seeking eco-friendly materials that are halogen-free and amine-free, and our newly developed microcellular foam is the environmentally friendly material need by today’s society.
Production of Supercritical Microcellular EVP Foam By Nitrogen
Compared speaking, supercritical nitrogen is more widely used. Nitrogen is good for shrinkage rate. Nitrogen foam can make the shrinkage rate reach 1:1. Supercritical microcellular foam have high specific strength and high performance, which can greatly improve the dimensional accuracy of products and shorten the product development cycle;
Two Categories of Supercritical Microcellular EVP Foam
- One is using sheet foaming equipment, which uses supercritical nitrogen for foaming; Sheet foam (N2+pp) equipment mainly includes drying kettle and nitrogen heater,
- The other is using particle foaming equipment, which uses supercritical carbon dioxide, nitrogen, and water as working media. Particle foaming equipment mainly includes foaming kettle, receiving tank, nitrogen storage tank, high-pressure nitrogen storage tank, cooler, etc., with foaming kettle as the core equipment.
Supercritical Microcellular EVP Foam
Particle and Products
- Technical Inspection
- Technical Data
Degradable: 57.3% degradation rate in 5-7years
Appearance: plate/sheet/half coil
Hardness: 45 degrees-85 degrees
Water absorption: ≤5%
Preparation method: Physically molded foam
Tensile strength: 0.7MPa—2.5MPa
Compressive strength: 0.1MPa—0.6MPa
Flexural strength: 0.15MPa—0.71MPa
Three differences of foaming processes you should know
The first, physical foaming method. Inject gas into the plastic paste melt under pressure, and then release the gas after depressurization, so that many small holes can be formed in the molded plastic. This foaming method is cost-effective. It will not leave residues after foaming, and will not change the properties of foamed plastics.
Second, the chemical foaming method, which uses chemical methods to generate gas to get foam products. Heat the chemical plastic foam agents, then release the gas inside of the chemical agents and cold. Finally, you will get the chemical foam.
Third, mechanical foaming, which adds gas into the material by mechanical agitation, and then forms cellular foam under a cold process.
Supercritical foaming technology is using supercritical nitrogen to inject EVP or plate shaped TPU materials into gas for expansion (commonly known as foaming), it is a new type of foaming technology developed, mainly used for TPU (thermoplastic polyurethane elastic rubber foam) or evp. High elasticity (resilience rate up to 61% or more), high strength, high toughness, high wear resistance, high yellowing resistance, anti-aging, low density (0.15-0.25g/cm3), low-temperature performance, non-toxic, It is odorless and has no pollution in the process, so it has been widely used.
COMPARED TO TRADITIONAL SHOE MATERIALS
- Material lightweight: Compared with the traditional foaming
material, Hyper burst is 45% lighter. - Good resilience: resilience can improve about 15%.
- Great shock absorption: Great wearing feeling, shock absorption
increases 20%. - Friendly environment: Our physical foaming technology and new materials do not contain formamide, Acetophenone, benzene, isopropyl alcohol and other harmful substances. Traditional chemical foaming is harmful to the environment and human body.
- Energy saving and emission reduction: Traditional foaming
technology consumes a lot of energy and causes high dust
pollution, while the new foaming technology uses hot water
heating and inert gas foaming, which is energy-saving and
environmental protection.