High power uv laser cutting EVA sponge foam pearl cotton does not burn

EVA foam is a material that has been foamed with plastic particles to form a foam. Foams are divided into PU foam, anti-static foam, conductive foam, EPE, anti-static EPE, PORON, CR, EVA, bridging PE, SBR, EPDM, etc. EVA plastics and resins are characterized by outstanding softness, rubber-like elasticity, good flexibility at -50°C, good transparency and surface gloss, excellent chemical stability, anti-aging and resistance The ozone is strong and non-toxic. Good blending with fillers, good coloring and molding processability.

EVA resin is widely used. Under normal circumstances, the primary products of EVA with vinyl acetate content of less than 5% are films, wires and cables, LDPE modifiers, adhesives, etc.; EVA products with vinyl acetate content of 5% to 10% are elastic films, etc.; vinyl acetate EVA with a content of 20 to 28% is mainly used for hot melt adhesives and coating products; vinyl acetate content is 5% to 45%, and the primary products are films (including agricultural films) and sheets, injection molding and molding products , Foam products, hot melt adhesives, etc. like:

Seven EVA resins for nanosecond UV lasers

(1) Films, sheets and laminated products: with sealing properties, adhesion, flexibility, strong resistance, shrinkage, suitable for elastic packaging films, heat shrinkable films, agricultural films, food packaging films, laminated films, can be used Used as the middle layer of polyolefin laminated film.

(2) General supplies: It has the advantages of flexibility, resistance to environmental stress cracking, and good weather resistance. Suitable industrial materials include power wire insulation bags, household appliances accessories, window sealing materials, etc.

(3) Daily groceries include sporting goods, toys, cushions, straps, airtight container covers, EVA rubber footballs, etc.

(4) Car accessories include shock absorbers, fenders, interior and exterior decoration accessories, etc.

(5) Foamed products: foam slippers, sandals, construction materials, etc. are pressurized and foamed. There are various industrial parts, women's shoe soles, hot melt adhesives, etc. for injection foaming.

Molding and processing of ethylene-vinyl acetate copolymer

EVA can be injection molding, extrusion, blow molding, calendering, rotational vacuum thermoforming, foaming, coating, heat sealing, welding and other molding processing.

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 shoe materials because of the introduction of vinyl acetate monomer in the molecular chain, which reduces the high crystallinity, improves flexibility, impact resistance, filler compatibility and heat sealing function. , Functional shed film, packaging film, hot melt adhesive, wire and cable and toys. Generally speaking, the function of EVA resin mainly depends on the content of vinyl acetate in the molecular chain. In 2001, the market consumption of EVA resin in my country was about 290 kt. With the development of my country's shoe industry and the increase in the amount of functional greenhouse film, my country's demand for EVA resin will also increase year by year.

(1) Foam shoe material

Shoe material is the most important application category of EVA resin in my country. In the EVA resin used in shoe materials, the vinyl acetate content is generally 15% to 22%. Because EVA resin blended foam products have the functions of softness, good elasticity, and chemical resistance, they are widely used in the soles and interior materials of mid-to-high-end tourist shoes, hiking shoes, slippers, and sandals. In addition, this material is also used in the field of sound insulation boards, gymnastics mats and sealing materials. Shunde and Zhongshan in Guangdong, Jinjiang and Quanzhou in Fujian and Wenzhou in Zhejiang are the main production bases of my country's footwear industry, consuming a large amount of EVA resin products every year. In 1999, my country consumed about 150 kt of EVA resin in foam shoe materials and shock absorption.

(2) Film

The primary use of EVA film is to produce functional greenhouse films. Functional greenhouse film has high weather resistance, anti-fogging and heat preservation functions, because polyethylene has no polarity, even if a certain amount of anti-fogging agent is added, its anti-fogging function can only be maintained for about 2 months; and Adding a certain amount of EVA resin to the shed film not only has a higher light transmittance, but also has a greater improvement in the anti-fogging function, which can generally exceed 4 months. In addition, EVA can also be used to produce packaging films, medical films, laminated films, casting films, etc.

In 1999, there were more than 50 companies using EVA resin to process films in my country. In 1999, my country produced a total of 800 kt of shed film, of which 220 kt of functional shed film, which consumed about 30 kt of EVA resin. In addition to packaging films, medical films, etc., my country consumed a total of 37 kt of EVA resin in the film category.

(3) Wire and cable

With the continuous development of computer and network engineering, people are increasingly using halogen-free flame-retardant cables and silane cross-linked cables for the safety of computer rooms. Because EVA resin has excellent filler tolerance and crosslinkability, it is used more in halogen-free flame-retardant cables, semiconductor shielded cables and two-step silane cross-linked cables. EVA resin is also used to make some special cable sheaths. The content of vinyl acetate in EVA resin used in wire and cable is generally 12% to 24%. In 1999, the wire and cable industry consumed a total of about 6 000 tons of EVA.

(4) Toys

EVA resin is also widely used in toys, such as children's wheels and seat cushions. In recent years, my country’s toy processing industry has developed rapidly, with production concentrated in coastal areas such as Dongguan, Shenzhen, and Shantou. The main focus is on export and foreign processing. According to analysis, these manufacturers consume about 5,000 tons of EVA resin each year, and the use of trademarks is basically the same as that of shoe materials.

(5) Hot melt adhesive

The hot melt adhesive with EVA resin as the main component, because it does not contain solvents, does not pollute the environment and has high safety, it is very suitable for automated assembly line production, so it is widely used in book binding, furniture edge banding, cars and household appliances Installation, shoemaking, carpet coating and metal anti-corrosion coating.

Hot-melt adhesives mainly use types with a vinyl acetate content of 25% to 40%. Although there are products with this trademark in China, they have not been produced for a long time, so they are all occupied by imported materials. In 1999, the estimated consumption of EVA resin in the category of hot melt adhesives in my country was 17 kt.

(6) Other

EVA resin is also widely used in areas such as inks, bags, wine bottle cushions, etc. It is estimated that the consumption of EVA resin in these areas is no less than 15 kt.

The laser cutting machine produced by RFH laser can engrave and cut EVA, sponge, foam and pearl cotton with good effect and fast speed.

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UV laser cold light source cutting products

To cut such products, you must first have a high-power laser. The laser tube with high stability and high power is used for cutting, and the light spot is small, and the cutting is perfect. For products with a large cutting thickness, a focusing lens with a large focal length must be used. The verticality of the cut is good, and the blower should be as large as the blower. At least a 750W fan is used to exhaust the smoke. Water chillers are also very important. If you want to work continuously for a long time, automatic cooling water chillers are essential. If the size of the product to be cut is small, you can choose a double-head laser cutting machine, so that one is equivalent to the output of two machines. The specific parameters are subject to the company's specific equipment parameters.