According to the use of polyester film classification

Because the characteristics of polyester film determine its different uses. Polyester films of different uses have different requirements for raw materials and additives, as well as processing techniques, and their thickness and technical indicators are also different; in addition, only BOPET has multiple uses, so the films classified according to use are all BOPET. It can be divided into the following categories:

1. Electrical insulating film. Due to its good electrical, mechanical, thermal and chemical inertness, good insulation performance and high breakdown voltage, it is dedicated to electronic and electrical insulation materials. Commonly used standard thicknesses are: 25μm, 36μm, 40μm, 48μm, 50μm, 70μm, 75μm, 80μm, 100μm and 125μm (micrometers). Including wire and cable insulation film (thickness 25-75μm) and touch switch insulation film (50-75μm).

2. Capacitor film. It has the characteristics of high tensile strength, high dielectric constant, low loss factor, good thickness uniformity, good electrical properties, and high electrical resistance. It has been widely used in capacitor dielectrics and insulating interlayers. Commonly used standard thicknesses are 3.5μm, 3.8μm, 4μm, 4.3μm, 4.8μm, 5μm, 6μm, 8μm, 9μm, 9.8μm, 10μm, 12μm.

3. Card protecting film. It has good transparency, high stiffness, good thermal stability, smooth surface, excellent winding performance, uniform vertical and horizontal stretching performance, and has excellent properties such as water resistance, oil resistance and chemical resistance. It is specially used for the protective packaging of pictures, certificates, documents and office supplies, making it smooth and beautiful after being hot stamped as a protective film, and can keep the originals clear and undeformed. Commonly used standard thicknesses are 10.75μm, 12μm, 15μm, 25μm, 28μm, 30μm, 36μm, 45μm, 55μm, 65μm, 70μm, of which 15μm or more are mainly used as laser anti-counterfeiting base film or high-end card protection film.

4. General purpose membrane. With excellent strength and dimensional stability, cold resistance and chemical stability, it is widely used in various substrates such as composite packaging, photosensitive film, metal evaporation, audio and video. Specifically, there are the following:

① Semi-reinforced film. The most important feature is the high longitudinal tensile strength, and it is not easy to break under greater tension. It is mainly used for packaging seals for boxed items. Commonly used standard thicknesses are 20μm, 28μm, 30μm, 36μm, 50μm.

②Hot stamping film. The biggest feature is good tensile strength and transparency, stable thermal performance, and low binding force with certain resins. It is mainly suitable for small dimensional changes during high-temperature processing or as a transfer carrier. The conventional standard thickness is 9μm, 12μm, 15μm, 19μm, 25μm, 36μm.

③Printing composite packaging film. The main features are good transparency, good penetration resistance, superior chemical resistance, temperature resistance and moisture resistance. It is suitable for the packaging of frozen food and food, medicine, industrial products and cosmetics. Commonly used standard thicknesses are 12μm, 15μm, 23μm, 36μm.

④ Aluminized film. The main characteristics are high strength, good temperature and chemical resistance, good processing and anti-aging properties, and proper corona treatment, which makes the adhesion of the aluminum layer and the film stronger. After being used for aluminum plating, it can be widely used in the packaging of tea, milk powder, candy, biscuits, etc., and can also be used as a decorative film such as string flower crafts, Christmas trees; it is also suitable for printing composite or cardboard composite. Conventional standard thicknesses are 12μm, 16μm, 25μm, 36μm.

⑤ Magnetic recording film. It has the characteristics of good dimensional stability, uniform thickness and high tensile strength. Suitable for base film and special packaging film of magnetic recording materials. Including audio and video tape base (commonly used standard thickness is 9-12μm) and black film (commonly used standard thickness is 35-36μm).

5. Nano PET film

High transparency and gloss: The particle size of nanoparticles is between 1-100nm, which is smaller than the wavelength of visible light, which has little effect on the transparency of the film.

High barrier performance and heat resistance: the use of nanomaterials with special properties and unique processing technology makes the nanomaterials uniformly dispersed in the PET matrix in nanometer size, and the orientation of the PET film is stretched during the film production process, thereby making the PET film extremely Excellent barrier properties, O, CO2, H2O transmission rate is doubled, heat resistance is also greatly improved, can expand the application field of PET, greatly extend the shelf life of the packaged goods, can also be used for hot filling or Disinfection and sterilization occasions.