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Packaging materials EPE, EVA, Sponge difference
- Aug 02, 2017 -

EPE (expandable polyethylene), is the hair of polyethylene, also known as EPE. Non-crosslinked closed-hole structure, it is a low-density polyethylene (LDPE) as the main raw material extruded to produce a high foam polyethylene products, it is a low-density polyethylene resin by physical foaming produced countless independent bubble composition. Overcome the common foaming gum fragile, deformation, bad recovery. With water-proof, shockproof, sound insulation, heat preservation, plasticity can be good, toughness, recycling, environmental protection, strong impact, and many other advantages, but also has a good chemical resistance.
Most sponges are synthesized from isocyanate and polyol as raw materials, the basic reaction is the reaction of polyol and isocyanate to produce polyurethane, commonly used in sponge is called polyurethane soft foam rubber, polyurethane is the most common in life of a polymer material, widely used in the production of various "sponge" products. As well as the shock, friction-resistant elastic material.
Eva is made of ethylene (e) and ethylene acetate (VA) copolymerization to be referred to as Eva. Eva is characterized by good flexibility, rubber-like elasticity, under the -50℃ can still have a good flexibility, transparency and surface gloss, good chemical stability, anti-aging and ozone-resistant strength, non-toxic. Mixing with fillers is good, coloring and forming process is good. Eva can be injection molding, extrusion, blow molding, calendering, rotational molding vacuum thermoforming, foaming, coating, heat sealing, welding and other molding processing, can be used as building materials for waterproofing, arson, noise and other functions.
The difference between the three main points are as follows:
1. With the naked eye can be distinguished, sponge words generally yellowish, very flexible, relatively speaking than these three to light. Eva words a little hard, generally black, is the heaviest of the three, Epe Pearl cotton is generally white, and sponge very good distinction, sponge no matter how you randomly according to the restoration of the original, and EPE Pearl cotton you press down will hear the sound, press the place will be concave down.
2. EPE Pearl cotton is wavy, it looks like a lot of foam. Very light. Eva is a solid shape, with a concentration of how much, more heavy.