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    PET film

    Article source: popularity: Published time:2016-03-25 14:09:13
    PET film, also known as high-temperature polyester film membrane. It has excellent physical properties, chemical properties and dimensional stability, transparency, recyclability, and can be widely used in magnetic recording, photographic materials, electronics, electrical insulation, industrial films, packaging, decoration and other fields. High-temperature high-temperature polyester film polyester film introduces Model: FBDW (single-sided matte black) FBSW (two-sided matte black) high-temperature polyester film roll diameter size width thickness of the core inner diameter 38um ~ 250um 500 ~ 1080mm 300mm ~ 650mm76mm ( 3 "), 152mm (6") Note: The width specification can be based on actual production needs. Conventional film roll length of 3000m or 6000 equivalent to 25um
    With the development of special purpose types of functional thin films, new uses polyester film are also emerging. It can produce a mobile phone LCD protection film, television LCD protection film, mobile phone keys, and so on.
          PET film is a more comprehensive performance packaging films. Its transparency, gloss; has good air tightness and Paul fragrance; moisture moderate decline at low water vapor transmission rate.
          Mechanical properties of PET film is excellent in strength and toughness is the best of all thermoplastics, much higher tensile strength and impact strength than film; and a very good adhesion, dimensional stability, suitable for printing, paper and other secondary processing . PET film also has excellent heat resistance, cold resistance and good chemical resistance and oil resistance. But its impatience alkali; easy method with static electricity, there is no proper anti-static, so attention should be packaged in powdered materials.
    (1) PET film is the highlight of the film in addition to conventional polyester film having excellent mechanical properties, but also has excellent optical properties such as transparency, low haze, high gloss. It is mainly used for high vacuum aluminum products, after the film has a specular aluminum, with good packaging decoration effect; it can also be used in laser anti-counterfeit laser-based film. Highlight BOPET film market high-capacity, high value-added economic benefit.
    (2) PET transfer film transfer film, also known as heat transfer film, the transfer film is characterized by high tensile strength, good thermal stability, low shrinkage, flat and smooth surface, peel, and can be used repeatedly . It is mainly used after vacuum aluminum carrier, the PET film is placed in a vacuum aluminum machine aluminum, glue and paper composite, and then the PET film was peeled off, the aluminum layer is shifted by molecular adhesive is applied to the surface of the cardboard, a so-called aluminum jams.
          Jams aluminum production process is: PET base film release layer → → → color layer aluminum layer → → coating layer is transferred to a paper jam. Vacuum aluminum paper jam is a kind of metallic luster cardboard, in recent years developed an advanced new packaging materials. This aluminum jams bright color, strong sense of metal, printing beautiful and elegant, can replace a large area of ??gold foil print for landscaping products played a role in icing on the cake. Because it uses aluminum vacuum method, only one layer covered the surface of the paper jam 0.25um ~ 0.3um thin shiny aluminum layer while close, only one five-hundredth jam mounted aluminum foil layer, so that both noble and beautiful metal texture, but also has biodegradable, recyclable properties, is a green packaging materials. Jiangsu Zhongda adjustment through formulation and process, developed in 2005 and mass market success, received good economic benefits.
    (3) the characteristics of PET PET reflective film reflective film is a film having excellent optical properties, surface smooth, clean, good thermal stability, low shrinkage, light aging. Transport facilities reflective material used in the film there are two kinds of reflective lens-type retroreflective film flat top type, they are made using aluminized PET film reflective layer, which is coated with a pressure sensitive adhesive after several glass refractive index of 1.9 beads adhered to the metallized PET, and then spray a layer of butyral surface protective layer Serve. PET reflective film applied to the requirements of reflective billboards, reflective traffic signs (reflective signs, reflective isolation belt, reflective number plates), reflective uniforms, industrial safety signs.
    (4) In order to improve the chemical surface properties of the coating film of the PET film, to improve the adhesion of printing adaptability and vacuum aluminum layer, a method commonly used corona treatment to increase the surface tension of the film. However, the corona aging and other issues, especially at high temperatures, high humidity environment, film tension after corona treatment is easily decay. However, the chemical coating law there is no such problem, it is favored by the printing industry and the aluminum industry. Jiangsu Zhongda has developed a PET coating chemical products: such as water-soluble polymer coating can improve the surface tension of PET film; with acrylic latex coating can improve printing suitability (water-soluble ink can be used) ; by coating a polyurethane solution, can enhance the adhesion of aluminum layer and the PET base film, and may increase the thickness of the aluminum layer. In addition, the method can also be obtained by coating the membrane barrier and antistatic film.
    (5) PET antistatic film the world has entered the information age, various frequencies, the wavelength of electromagnetic waves fill the entire space of the Earth, these electromagnetic wave will not shield sensitive electronic components, circuit boards, and other communications equipment will produce different degrees interference, resulting in distortion of data, communication disorders. The electrostatic and electromagnetic induction generated by friction on a variety of sensitive components, instruments, certain chemical products, packaging films as a result of the accumulation of static electricity generated by high voltage discharge, the consequences will be devastating, so the development of anti-static PET packaging film is also very important. Characteristics of the antistatic film by some kind of antistatic agent is added in the PET film, the film formed on the surface layer of very thin conductive layer, and forming a continuous phase, to improve the surface conductivity, as soon as the charge from leaking. General requirements for antistatic film surface resistivity ≤109 ~ 11 ohms.
    (6) PET sealing film crystalline polymer belonging to ordinary PET, PET film after stretching orientation, will have a greater degree of crystallinity, such as its heat sealing, then, will produce shrinkage, it is not an ordinary PET film have heat sealability. PET film used in packaging, in order to solve the problem of heat sealing, usually complex method BOPET film and PE film or CPP films, which to some extent limit the application of BOPET film. In order to solve the sealing problem by PET resin modified, and the use of A / B / C three-layer structure of the die, has developed a three-layer co-extruded PET film type sealing, and this type of PET film sealing Because there is a heat-sealable layer side, it can be directly heat-sealable, easy to use. Heat seal PET film is widely used in packaging and laminating films in the field of various commodities.
    (7) PET polyester shrink film shrink film is a new type of heat shrinkable packaging material. Because of its easy-to-recycle, non-toxic, tasteless, good mechanical properties, in particular with environmental protection and other characteristics, in developed countries polyester (PET) has been substituted with polyvinyl chloride (PVC) heat shrinkable film ideal alternative.
           However, regular polyester is a crystalline polymer, ordinary PET film through a special process can only get 30% of the heat shrinkage. To obtain a higher heat shrinkage polyester film, it must also be modified. That is, to prepare a polyester film having a high heat shrinkage, the need for regular polyester namely polyethylene terephthalate copolymerized modified. The highest heat shrinkage film PET copolymer modified with up to 70%.
          Characteristics of heat-shrinkable polyester film: it is stable at room temperature, when heating (above the glass transition temperature) shrink, and not less than 70% heat shrinkage occurs in one direction. Heat-shrinkable polyester film packaging advantages are:
    ① fitted transparent, reflect merchandise image.
    ② tight packaging, anti-casual good.
    ③ rain, moisture, mildew.
    ④ no resilience, there is a certain anti-counterfeiting features.
          Heat-shrinkable polyester film commonly used in convenience food and beverage market, electronics, metal products, in particular the shrink label is the most important fields of application. Because with the rapid development of PET beverage bottles, such as Coke, Sprite, various fruit juices and other drinks bottles need PET shrink film sealing label accompanying do they belong to the same polyesters, are environmentally friendly materials, easy recycling use. In addition to the heat-shrinkable polyester film used as a shrink label, in recent years it has begun to be used on the packaging of household goods. Because it can avoid the impact of protective packaging materials, rain, moisture, rust and make products to win customers fine print packaging, while it is a good way to show a good image of the manufacturer. At present, more and more manufacturers use printed shrink film packaging to replace the traditional transparent film. Because printing shrink film can improve the appearance of product quality, in favor of product advertising, trademark brand can have a profound impression in the minds of consumers.
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