What are the differences between Eva coating machine and pur coating machine?

The EVA coating machine uses environmentally friendly solid granular glue, which is specially used to wrap the veneer. Eva material is a common name defined by us. The full English name is ethylene-vinyl acetate copolymer. Its chemical name is ethylene-vinyl acetate copolymer. It is an extremely common material and a common midsole material in daily life. , The finished products made of it have good flexibility, shockproof, non-slip, and strong pressure resistance, such as our common EVA slippers, cotton shoes, EVA mobile phone protective cover, EVAipad protective cover, etc. Use 1: Eva material can be used to make household goods and daily necessities such as ducts, gas pipes, civil construction boards, containers, etc. of household refrigerators. Use 2: Eva material can be used to make packaging films, gaskets, medical equipment, and can also be used as hot melt adhesives, cable insulation layers, etc. Use 3: Eva material is widely used in book wireless binding, digital product shell structural parts, furniture edge banding, automobile and household appliances assembly, shoemaking, carpet coating and metal anti-corrosion coating. Field 1: Because EVA material has strong flexibility, chemical resistance and good elasticity, it is widely used in the soles and interior materials of various footwear. Field 2: eva material has tolerance and crosslinkability that other materials do not have. Because of its performance, it is suitable for halogen-free flame-retardant cables, semiconductor shielded cables and two-step silane cross-linked cables Because of this performance, it is widely used in industrial and manufacturing products.

Ethylene-vinyl acetate copolymer (EVA)

EVA resin is an ethylene-vinyl acetate copolymer, and the content of vinyl acetate (VA) is generally 5% to 40%. Compared with polyethylene, EVA is widely used in foamed shoes due to the introduction of vinyl acetate monomer in the molecular chain, which reduces high crystallinity, improves flexibility, impact resistance, filler compatibility and heat sealing performance. Materials, functional shed films, packaging films, hot melt adhesives, wires and cables, toys and other fields. It is a relatively common midsole material. It is usually called a foam and has a certain cushioning effect, but this material is very slippery, so it is usually mixed with hard rubber. EVA is a common material and is used in many sports shoes. All of them are available, but it is still difficult to compare with AIR in terms of effect.

PUR hot melt adhesive coating machine is a moisture curing reactive polyurethane hot melt adhesive. The main component is isocyanate-terminated polyurethane prepolymer. PUR adhesive molecules react with moisture or active hydrogen substances in the air or on the adherend to form a partially cross-linked structure, which makes the bonding strength, chemical resistance, heat resistance, and hydrolysis resistance better than general hot melt adhesives. The adhesiveness and toughness (elasticity) of PUR can be adjusted, and it has the thermoplastic and cold-setting properties of ordinary hot melt adhesives. The bonding operation is simple, the range of glued objects is wide, and the performance can be adjusted. Mainly used for the assembly and sealing of LCD screens, mobile phone screens and computer screens: window bonding, shell structure bonding, battery bonding, keyboard bonding, plane sealing, PCB assembly and protection, etc. It has the following advantages: 1. Not included Any organic solvent, 100% solid content, green and environmentally friendly; 2. Moisture curing, no drying process, energy saving; 3. Excellent initial strength, and has the function of cross-linking curing, the final bonding strength is higher; 4. Excellent Heat resistance, water resistance, chemical resistance, durability, etc.; 5. One-component type, easy to industrial automation, mechanized operation, and high production efficiency.

Source: Zhihu