You May Not Know The Application Of Hot Melt Film
The hot-melt film is made of material that can be melted and adhered to a certain thickness, and is placed between the sticky materials to carry out hot melt bonding. Its raw material itself is hot-melt adhesive bonded thermoplastic resin or thermoplastic resin modified hot melt adhesive material. Hot melt adhesive film is not a single adhesive, but a form of glue, such as PE, EVA, PA, PU, PES, modified polyester, etc., which can be developed into hot-melt adhesive film.
Characteristics of hot melt adhesive film:
1) no pollution in production and use;
2) the sizing is uniform and the glue is saved.
3) production is efficient, easy to industrialize and scale.
Encapsulation sealing film of photovoltaic cell
The encapsulation and sealing of monocrystalline silicon and polycrystalline silicon cell panels of photovoltaic cells directly affect the life and efficiency of photovoltaic cells. The commonly used encapsulation seal film thickness is 0.5-0.8mm, and the photovoltaic cell package is refolded. In order to ensure the long life and high efficiency of the battery, the coating material must be glued and sealed, and it needs good light transmittance, high temperature resistance and aging resistance.
Photovoltaic cell components
The encapsulation seal membrane can be made of ethylene vinyl acetate copolymer (EVA) modified membrane or polyethylene butyral (PVB) film. Pure EVA film can not achieve the performance requirements of encapsulated seal film. It is necessary to cross link the molecular chain from thermoplasticity to thermosetting, and it can improve its water resistance and heat resistance without losing its light transmittance. Although the performance of EVA modified membrane is not as good as that of PVB film, EVA has become a hot demand in photovoltaic industry due to its low cost.
Building double glass photovoltaic module
PVB membrane has high requirements for raw material quality, membrane salivation equipment, difficult production, superior performance and high price. Germany's photovoltaic industry has now banned EVA modified membrane, only PVB film, and used in conjunction with building safety glass intermediate membrane.
Safe glass intermediate film
PVB films and EVA modified membranes can be used as interlayer films for laminated glass. EVA has poor usability (resistance to aging and adhesion) and tends to use PVB film. PVB laminated glass has high strength and toughness, and has high anti-collision ability, good safety and high transparency. Once broken, the two pieces of glass inside and outside can still bind to the PVB film.
Safe glass intermediate film
The PVB film has a large toughness, which will arch and absorb a part of the impact energy when it is subjected to impact. It has a certain buffer effect, and its high impact strength is higher than that of the tempered glass. In Europe and America, most building glass uses PVB laminated glass. It can resist the continuous attack of hammer, chopper and other lethal weapon. Special PVB laminated glass can resist bullet penetration for a long time, and its safety precautions are very high.
PVB is an old material, but it is flourishing. PVB membrane has been cooled with alcohol solution, pollution, high energy consumption and high cost. Now it has been used in hot melt saliva into film.
Aluminum plastic sheet composite membrane
Aluminum plastic plate is a kind of plate used in architectural decoration. With its economy, color diversity, convenient construction, excellent processing performance and excellent fire resistance, it is quickly favored by people. The aluminum plastic board is mainly composed of three layers of structure, the upper and lower layers are aluminum, and the middle is low density polyethylene (PE) core board.
Structure diagram of aluminum plastic plate
The bonding between aluminum plate and PE is using polymer composite membrane, in fact, it is a PE modified hot melt adhesive film. The key index of aluminum plastic panel is peeling strength. The high peel strength is the guarantee for the application of aluminum plastic panel in the construction industry. In addition, surface roughness and aging resistance are also important indicators to evaluate their quality.
The structure of the aluminum plastic plate is associated with the structure of the aluminum plastic pipe PE-AL-PE. In comparison, the manufacturing process of the aluminum plastic pipe is more complex, and the rubber material and the PE material are coextruded together.
Wall fabric hot glue
Wall covering is a familiar wall decoration material. The field of hot glue wall cloth is a subdivision area of the wall cloth field. Hot glue wall cloth is a special wall cloth that is directly bonded with wall cloth to the wall on the back of the wall cloth with a layer of hot melt adhesive film. Compared with cold glue bonding, the advantage of using hot glue to cover wall cloth is that it is controllable in environmental protection, ironing on the wall at once, and cleaning at the construction site.
Adhesive film of automobile industry
China has become a big country of automobile production, and the material demand for production is considerable. The hot melt adhesive film can be used as bonding material for vehicle interior composite.
Seven layers material structure of automobile interior decoration
This type of composite material is formed on the top of the car and is assembled on the outer top of the car's iron shell (typical of the car). It plays a role of insulation, sound insulation and decoration, with an annual demand of about 1000 tons. In addition, car seats, pads, car interior decorations and so on can be produced by hot melt adhesive film technology, and the dosage is gradually increasing.
Rubber film industry
Due to the environmental protection of hot melt adhesive film, it gradually replaced the application of solvent based glue in shoe material industry. Nowadays, it has been widely used in most footwear products such as women's boots, leather shoes, autumn shoes, sports shoes, sandals and so on. The shoe making process involves the bonding of the parts of shoe upper, insole, sole and heel, and involves the bonding of various materials such as cloth, leather, sponge, plastic, rubber and so on.
At present, the EVA and TPU hot-melt adhesive films are widely used in the shoemaking industry. According to the usage parts, the film thickness is between 0.015-0.15mm. The different parts of the shoes are also different to the adhesive properties. In addition to the requirements of adhesive strength, there are special requirements for hand feeling, water washing and aging resistance.
Adhesive film for clothing industry
Hot melt adhesive film is widely used in the garment industry. It mainly has no seaming adhesive film, lining film, embroidery trademark adhesive film, functional clothing special film. In the clothing industry, hot melt adhesive film must have strong washing resistance, even high temperature washing, dry cleaning and other properties. Therefore, the clothing industry uses TPU, PO, PA and other materials of the hot melt adhesive film.
PVA water-soluble film
Polyvinyl alcohol (PVA) film is a film with a certain adhesive force and water soluble, which can be used as a water-soluble film lining for fine embroidery and a fine transfer film for the surface of plastic and metal parts. The PVA film has used PVA aqueous solution salivation membrane, which has high energy consumption and low efficiency. Now the hot melt saliva film is used to reduce the cost and improve the efficiency.
As a new type of adhesive, hot melt adhesive film has many other applications, such as packaging industry, electronics industry and so on. With the investment in hot melt adhesive development at home and abroad, it is believed that it will be more and more widely applied to more application fields. (source: WeChat public number [hot-melt adhesive]
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