Views:8 Author:Site Editor Publish Time: 2021-08-02 Origin:Site
EVA foam has a certain degree of flexibility, excellent insulation, compressibility, and natural viscosity on the surface. It can also play the role of insulation, shock absorption, and sealing; it can meet the design requirements of equipment miniaturization and ultra-thinness. With manufacturability and usability, and a wide range of thickness, it is an excellent thermally conductive filler material, which is widely used in electronic and electrical products. EVA foam has beautiful appearance, shockproof, anti-skid, anti-collision, anti-scratch and other functions, and has high transparency. It is widely used in plexiglass, glass crafts, display stands, household appliances, furniture products, hardware accessories, transparent plastic products, etc. .
Silicone rubber has outstanding high and low temperature resistance, maintains good flexibility in the temperature range of -70°C to +260°C, and has the advantages of ozone resistance and aging resistance. It is suitable for sealing gaskets in thermomechanics. Because it has no toxicity, it can be used to make heat insulation, insulation products and medical rubber products.
At the same time, it has a variety of excellent properties such as waterproof, flame retardant, high temperature resistance, electrical conductivity, abrasion resistance, oil resistance, etc., and is widely used in machinery, electronics, plumbing and other industries. Fluorine rubber gasket (FPM): It has high temperature resistance and can be used in the environment of -30℃－+250℃. It is resistant to strong oxidants, oils, acids and alkalis. Usually used in high temperature, high vacuum and high pressure environments, but also suitable for oily environments. Due to its various excellent properties, fluorine rubber is widely used in petroleum, chemical, aviation, aerospace and other sectors.
1. Biodegradable: it will not harm the environment when discarded or burned.
2. The price is similar to that of PVC: EVA is more expensive than toxic PVC, but relatively cheaper than phthalate-free PVC.
3. Lighter weight: The density of EVA ranges from 0.91 to 0.93, while that of PVC is 1.32.
4. Odor-free: EVA does not contain ammonia or other organic odors.
5. Does not contain heavy metals: Comply with the relevant international toy regulations (EN-71 Part 3 and ASTM-F963).
6. No phthalate: suitable for children's toys and will not cause the risk of plasticizer release.
7. High transparency, softness and toughness: the application range is very wide.
8. Super low temperature resistance (-70C): suitable for freezing environment.
EVA foam can be covered with protective materials, such as cotton cloth, air felt, etc. To ensure the effectiveness of the EVA material is to ensure that the EVA foam can maintain the temperature required for the formation of the EVA foam during the period before it is formed.
When the deflection of the pattern to be processed is small, the design of the forming die should be simple. The heat-resistant requirements of EVA foam molds are increasing, and molds made of wood, polyester or epoxy natural resin or FRP are sufficient.
The forming of the components can be done using vacuum/non-vacuum rubber molds or female/male molds. In order to ensure that the EVA material can stretch in the mold under the condition of small resistance, the edge of the guarantee film must have a larger curvature.
The temperature of EVA foam decreases quickly, and the temperature deceleration requirements on both sides are the same to avoid rebound and deformation. The temperature of the formed component is reduced to below 80 ℃, and then it can be extracted from the mold.
EVA is also known as EVA foam. EVA materials can also be used as fireproof EVA products, anti-static EVA products, high-frequency EVA products, odorless environmentally friendly EVA products, etc. It is widely used in IT, electronic appliances, hardware and machinery, glass products, precision spectrographs And other product packaging.
EVA foam products are flexible, light weight, good density, and rich elasticity. They can be used as cushioning materials to ensure that the product can better learn from and spread external impact. The rebound rubber pad can also be affixed to the surface of the product to prevent shock and friction. At the same time, EVA material has a series of superior service characteristics such as heat preservation, moisture resistance and corrosion resistance.
Due to the small quality of EVA foam and the low specific heat capacity of shockproof EVA foam, the surface of the EVA material acts as a cooling channel because of the large number of cut gaps. The temperature of the surface of the EVA foam is quickly reduced, and the heat energy that can be maintained is very small. Therefore, it is necessary to heat the foam sheet to prevent the temperature of the EVA foam from being quickly reduced after being extracted from the oven or heating plate, which does not meet the temperature requirements of the thermoforming process.
EVA foam must be dried before thermoforming. Hook adhesive tape. Thermoforming needs to heat the EVA material. The heating process can be carried out in an oven, heating plate or infrared heater. The duration of heating depends on the thickness of the sheet (approximately 1mm/min).