what is eva membrane (eval membrane)

1. what is the material of eva?

2. what material is eva?

3. eva hot melt adhesive film - what is the use of eva hot melt adhesive film?

4. what does eva mean?

5. what is the difference between p0 membrane and eva membrane?

6. what is the difference between pe film and eva film?

what is the material of eva?

eva is a common material made from the copolymer of ethylene and acetic acid. chinese name: ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer). eva is widely used. china's annual market consumption continues to increase, especially in the shoemaking industry. soles and interior materials for mid-to-high-end travel shoes, hiking shoes, slippers, and sandals.

eva is a common material made from the copolymerization of ethylene and acetic acid. chinese chemical name: ethylene-vinyl acetate copolymer (ethylene-vinyl acetate copolymer) and english chemical name: ethylene vinyl acetate copolymer. generally, vinyl acetate (va) is combined with polyethylene, with a content of 5%-40% (pe). compared with the introduction of vinyl acetate monomer into the molecular chain, eva reduces the high crystallinity, improves toughness, impact resistance, and filler phase. solubility and heat sealing properties. eva has a wide range of applications, and china's annual market consumption continues to increase, especially in the shoemaking industry, where it is used in mid- to high-end travel shoes, hiking shoes, slippers, sandal soles and interior materials. it is widely used in new energy fields such as photovoltaic materials and solar cell adhesives.

the vinyl acetate content is 5% to 45%. the main products are films (including agricultural films) and sheets, injection molding, molded products, foam products, hot melt adhesives, etc.

(1) foam shoe materials. shoe materials are the main application field of eva resin in my country. in eva resin used in shoe materials, the content of vinyl acetate is generally 15% to 22%. because eva resin mixed foam products are soft, elastic and resistant to chemical corrosion, they are widely used in soles and interior materials of mid-to-high-end travel shoes, hiking shoes, slippers, and sandals. in addition, the material is used in acoustic panels, gymnastics mats and sealing materials.

(2) film. the main use of eva film is to produce functional shed films. functional shed film has high weather resistance, anti-fog and thermal insulation properties. since polyethylene has no polarity, even if a certain amount of anti-fog droplet agent is added, its anti-fog droplet performance can only last for about 2 months; a shed film made of a certain amount of eva resin not only has high light transmittance, but also greatly improved anti-fog droplet performance, generally more than 4 months. in addition, eva can also be used to produce packaging films, medical films, laminated films, cast films, etc.

(3) wires and cables. with the continuous development of computer and network engineering, more and more people are using halogen-free flame retardant cables and silane cross-linked cables for the safety of computer rooms. because eva resin has good filler tolerance and cross-linking properties, it is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane cross-linked cables. in addition, eva resin is also used to make the sheaths of some special cables. the vinyl acetate resin content of eva used in wires and cables is generally 12% to 24%.

(4)toys. eva resin is also widely used in toys, such as children's wheels, seat cushions, etc.

(5) hot melt adhesive. hot melt adhesive with eva resin as the main component is very suitable for automated assembly line production because it does not contain solvents, does not pollute the environment, and is highly safe. therefore, it is widely used in wireless book binding, furniture edge banding, automobile and household appliance assembly, shoemaking, carpet coatings and metal anti-corrosion coatings.

what material is eva?

eva material is an extremely common material and is a common midsole material in daily life. the finished product is soft, shockproof, non-slip and pressure-resistant, such as common eva slippers, cotton shoes, eva mobile phone protective cases, eva ipad protective cases, etc.

the polymerization method adopts high-pressure bulk polymerization (plastics), solution polymerization (pvc processing aids), emulsion polymerization (adhesives), and suspension polymerization. the vinyl acetate (va) emulsion polymerization content is higher than 30%, and the high-pressure bulk polymerization vinyl acetate content is low.

eva soles refer to soles made of eva material. eva soles have high elasticity and tensile strength, toughness and good shock resistance, cushioning performance, heat preservation, excellent low-temperature performance, cold resistance, exposure, closed bubble holes, good sound insulation effect, closed bubble hole structure, no water absorption, moisture-proof, good water resistance, resistant to seawater, oil, acid, alkali and other chemical corrosion, antibacterial, non-toxic, odorless and pollution-free.

application fields of eva (ethylene-vinyl acetate copolymer):

1. the vinyl acetate content is 5%~10%. eva products are elastic films, etc.;

2. eva is mainly used in hot melt adhesives and coating products, with a vinyl acetate content of 20~28%;

3. the vinyl acetate content is 5% to 45%. the main products are films (including agricultural films) and sheets, injection molding, molded products, foam products, hot melt adhesives, etc.

(1) foam shoe materials. shoe materials are the main application field of eva resin in my country. in eva resin used in shoe materials, the content of vinyl acetate is generally 15% to 22%. because eva resin mixed foam products are soft, elastic and resistant to chemical corrosion, they are widely used in soles and interior materials of mid-to-high-end travel shoes, hiking shoes, slippers, and sandals. in addition, the material is used in acoustic panels, gymnastics mats and sealing materials.

(2) film. the main use of eva film is to produce functional shed films. functional shed film has high weather resistance, anti-fog and thermal insulation properties. since polyethylene has no polarity, even if a certain amount of anti-fogging agent is added, its anti-fogging performance can only be maintained for about 2 months.

the shed film made of a certain amount of eva resin not only has high light transmittance, but also greatly improves the anti-fog performance, which can generally last more than 4 months. in addition, eva can also be used to produce packaging films, medical films, laminated films, cast films, etc.

(3) wires and cables. with the continuous development of computer and network engineering, more and more people are using halogen-free flame retardant cables and silane cross-linked cables for the safety of computer rooms. because eva resin has good filler tolerance and cross-linking properties, it is widely used in halogen-free flame retardant cables, semiconductor shielded cables and two-step silane cross-linked cables.

in addition, eva resin is also used to make the sheaths of some special cables. the vinyl acetate resin content of eva used in wires and cables is generally 12% to 24%.

(4) eva resin is also widely used in toys, such as baby wheels, seat cushions, etc.

(5) hot melt adhesive. hot melt adhesive with eva resin as the main component is very suitable for automated assembly line production because it does not contain solvents, does not pollute the environment, and is highly safe. therefore, it is widely used in wireless book binding, furniture edge banding, automobile and household appliance assembly, shoemaking, carpet coatings and metal anti-corrosion coatings.

eva hot melt adhesive film - what is the use of eva hot melt adhesive film?

eva hot melt adhesive film is one of the components of hot melt adhesive film. eva is the english abbreviation, and the chinese name is vinyl acetate copolymer. it has good adhesion to propylene, film, sponge and some rubber components. the color of eva film is white matte when not in use, but after use it becomes transparent and has good elasticity. it is widely used in home textiles, building materials, industrial products, air filtration and other fields.

eva hot melt adhesive film (hot melt adhesive bare film)

eva hot melt adhesive film is divided into paper-backed type and paper-free type (also known as bare hot-melt adhesive film). the paper-free type is widely used, taking hjv85 type as an example.

eva hot melt adhesive film technical parameters table

name eva hot melt adhesive bare film

ingredients eva (vinyl acetate copolymer)

model hjv85

whether to bring release paper/release film no

color shape white matte/film

width range (mm) 20-1600

common width (mm) 1500

thickness (mm) 0.015-0.20

commonly used thickness (mm) 0.02/0.025/0.03/0.05/0.00

common length (m) 500

length range (m) can be customized

melting range (℃) 70-85

washing resistance no

features waterproof

operating temperature (℃) 100-120

pressing time (seconds) 10-20

pressing pressure (kgf/㎡) 1.5-2.5

close-up picture of eva hot melt adhesive film

hjv85 type eva hot melt adhesive film close-up 1

hjv85 type eva hot melt adhesive film close-up 2

eva hot melt adhesive films are available in different thicknesses and widths. the conventional thickness of hjv85 hot melt adhesive film is 0.02mm/0.025mm/0.03mm/0.05mm/0.10mm and 0.20mm, and the conventional width is 1.5m. please see the technical data sheet above.

uses of eva hot melt adhesive film

eva bondable materials include but are not limited to various textiles, leather, sponge and rubber materials.

it can be used for bonding in automotive interiors, clothing, shoe materials and other industries.

ethylene/vinyl acetate copolymer eva

ethylene-vinyl acetate copolymer (also known as ethylene-vinyl acetate copolymer) is made of ethylene (e) and vinyl acetate (va). the english name is: ethylene

acetate, referred to as eva, or e/vac. the polymerization method adopts high-pressure bulk polymerization (plastics), solution polymerization (pvc processing aids), emulsion polymerization (adhesives), and suspension polymerization. the vinyl acetate (va) emulsion polymerization content is higher than 30%, and the high-pressure bulk polymerization vinyl acetate content is low.

characteristics and uses of ethylene-vinyl acetate copolymer

one. characteristic

eva resin has the characteristics of good softness, good rubber elasticity, good flexibility, good transparency, good surface gloss, good chemical stability, anti-aging, good anti-ozone strength, and non-toxicity. good mixability with fillers, good coloring and molding processability.

it is closely related to the vinyl acetate content, molecular weight and melt index. when the melt index (mi) is constant and the content of vinyl acetate (vac) increases, its elasticity, softness, compatibility and transparency will also increase. when the vac content is reduced, the performance is close to that of polyethylene, with increased stiffness, wear resistance and electrical insulation. if the vac content increases within a certain period of time, when the overall index increases, the softening point decreases, the processing and surface gloss increase, but the strength decreases, otherwise the molecular weight increases, and the impact performance and environmental stress cracking resistance increase.

the polarity of acetate increases elasticity and viscosity, reduces crystallization and electrical properties, and is soluble in hydrocarbon solvents and oils.

two. use

eva resin is widely used. generally speaking, the main eva products with a vinyl acetate content of less than 5% include films, wires and cables, ldpe modifiers, adhesives, etc.; eva products with a vinyl acetate content of less than 5% to 10% are elastic films; vinyl acetate eva with a content lower than 20~28% is mainly used in hot melt adhesives and coating products; vinyl acetate content is 5%~45%. the main products are films (including agricultural films) and sheets, injection molding and molding products. foam products, hot melt adhesives, etc. like:

(1) films, sheets and laminated products: sealing, adhesion, softness, toughness, compression, suitable for elastic packaging films, heat shrinkable films, agricultural films, food packaging films, laminated films, and can be used for polyolefin laminated films middle layer.

(2) general supplies: it has the advantages of flexibility, resistance to environmental stress cracking, and good weather resistance. suitable for industrial materials such as wire insulation packages, household appliance accessories, and window sealing materials.

(3) daily groceries include sporting goods, toys, cushions, drawstrings, sealed container lids, eva rubber footballs, etc.

(4) auto parts include shock absorbers, fenders, interior and exterior decorative accessories, etc.

(5) foam products: foam slippers, sandals, building materials, etc. injection foam includes various industrial components, women's shoe soles, hot melt adhesives, and more.

molding processing of ethylene-vinyl acetate copolymer

eva can be injection molded, extruded, blow molded, calendered, rotomolded, vacuum thermoformed, foamed, coated, heat sealed, welded, etc.

what is the difference between p0 membrane and eva membrane? advantage

1. as a new type of agricultural film, p0 film has strong light transmittance, sealing property, service life and ductility. it is very suitable for china's planting conditions. however, in recent years, several p0 film manufacturers have emerged in china, but the quality of their products is uneven. therefore, please choose carefully before purchasing.

2. eva film is a thermally inherently viscous adhesive film with a low melting point and strong ability to adapt to harsh environments. highly slippery surfaces allow water to flow, and more eva films are used in glass.

3. nowadays, with the rapid development of my country's economy and technology, people have higher and higher requirements for diet. therefore, we need to use technology to provide a better growing environment for plants to grow healthier fruits. therefore, when choosing auxiliary tools, first consider the species and local climate conditions to get twice the result with half the effort.

what is the difference between pe film and eva film?

after purchasing plastic granulation equipment, many users find that the recycled agricultural film is very different from the production of the same plastic granulator. the reason is that agricultural film is not only pe, but also pvc and eva agricultural film.

so the question is, what is eva film? eva film is a three-layer composite shed film with eva as the main raw material, called vinyl acetate copolymer. the toughness and viscosity of this film are much higher than ordinary pe films. during the granulation process, the fluidity is insufficient, so the output is much lower than that of ordinary pe film. many people who have just started plastic recycling and granulation do not know enough about the product. they mistakenly regard high-viscosity eva film as ordinary pe film. when production drops, they can't find a reason. they thought there was something wrong with the machinery and equipment and made a lot of jokes.

pe film, most of which is ldpe, is easier to make. but how to distinguish the quality of ldpe film is not a simple matter. since they are all bundled and sold, the impurities and moisture inside cannot be seen, so many novice merchants feel like gambling every time they purchase goods.

1. if it is packaged material, such as imported material, if it has not been exposed to rain, most of it will be relatively dry inside.

2. the quality can be seen from the appearance.

3. customers who are cooperating with you for the first time must check carefully. if you go to buy goods from the same place next time, the raw materials will generally be similar.

4. if the packaged materials are imported well, the profit will be good, at least it is much better than buying real scrap materials.

the above information is compiled and reported by chengdu dahuanyu waste plastic granulator factory.

paying attention to the above points can also help you solve some minor problems in production. the specific operation still needs to be explored during the production process to know.

the above information is compiled and reported by the technical department of chengdu dahuanyu waste plastic granulator manufacturing factory.