How many kinds of polyester films can be divided according to their use?

Due to the characteristics of polyester film, its different uses are determined. Different polyester films have different requirements for raw materials, additives and processing technology, and their thickness and technical indicators are also different; In addition, only BOPET can be used for many purposes, so all films classified according to their uses are 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 resistance, it is specially used for electronic and electrical insulation materials. The common standard thickness is: 25 μ m、36 μ m、40 μ m、48 μ m、50 μ m、70 μ m、75 μ m、80 μ m、100 μ M and 125 μ M (microns). Including wire and cable insulation film (25-75 thick μ m) And touch switch insulation film (50-75 μ m）.

2. Capacitive film. It has the characteristics of high tensile strength, high dielectric constant, low loss factor, good thickness uniformity, good electrical performance, high electrical resistance, etc., and has been widely used in capacitor dielectric and insulating insulation. Common standard thickness is 3.5 μ m、3.8 μ m、4 μ m、4.3 μ m、4.8 μ m、5 μ m、6 μ m、8 μ m、9 μ m、9.8 μ m、10 μ m、12 μ m.

3. Card protection film. It has good transparency, high stiffness, good thermal stability, smooth surface, excellent winding performance, uniform vertical and horizontal tensile performance, and excellent water, oil and chemical resistance. It is specially used for the protective packaging of pictures, certificates, documents and office supplies to make them flat and beautiful after being pressed as protective film, and to keep the original clear and not deformed. Common standard thickness is 10.75 μ m、12 μ m、15 μ m、25 μ m、28 μ m、30 μ m、36 μ m、45 μ m、55 μ m、65 μ m、70 μ m. 15 of them μ Above m is mainly used as laser anti-counterfeiting base film or high-grade card protection film.

4. Universal membrane. It has excellent strength and dimensional stability, cold resistance and chemical stability, and is widely used for composite packaging, photosensitive film, metal evaporation plating, audio and video recording and other substrates. 

There are the following:

① Semi-reinforced film. The main feature is that the longitudinal tensile strength is large, and it is not easy to break under large tensile force. It is mainly used for packaging seals of boxed goods. Common standard thickness is 20 μ m、28 μ m、30 μ m、36 μ m、50 μ m.

② Bronzing film. It is characterized by good tensile strength and transparency, stable thermal properties and low binding force with some resins. It is mainly suitable for the use of small size change or transfer carrier during high-temperature processing. Conventional standard thickness is 9 μ m、12 μ m、15 μ m、19 μ m、25 μ m、36 μ m.

③ Print composite packaging film. The main features are good transparency, good penetration resistance, excellent chemical resistance, temperature resistance and moisture resistance. It is applicable to the packaging of frozen food, food, medicine, industrial products and cosmetics. Common standard thickness is 12 μ m、15 μ m、23 μ m、36 μ m.

④ Aluminum coating. The main characteristics are high strength, good temperature resistance and chemical resistance, good processing and aging resistance, and proper corona treatment, which makes the adhesion of aluminum layer and film more firm. After aluminum plating, it can be widely used for packaging tea, milk powder, candy, biscuits, etc., and also as decorative film, such as flower handicrafts and Christmas trees; At the same time, it is also suitable for printing composite or paperboard composite. Conventional standard thickness is 12 μ m、16 μ m、25 μ m、36 μ m.

⑤ Magnetic recording film. It has the characteristics of good dimensional stability, uniform thickness and high tensile strength. It is applicable to the base film and special packaging film of magnetic recording materials. Including audio and video tape base (common standard thickness is 9-12 μ m) And black film (common standard thickness is 35-36 μ m)

5. Nano PET film

High transparency and glossiness: the particle size of nanoparticles is between 1 and 100 nm, which is less than the wavelength of visible light, and has less impact on the transparency of the film.

High barrier performance and heat resistance: nano-materials with special properties and unique processing technology are used to uniformly disperse nano-materials into PET matrix in nano-size. During the film production process, PET film shows excellent barrier performance through stretching orientation. The O, CO2 and H2O transmissivity is doubled, and the heat resistance is also greatly improved, which can expand the application field of PET and greatly extend the shelf life of the packaging, It can also be used for occasions requiring hot filling or sterilization.