Uses of Polyester Film (PET).

Due to the characteristics of polyester film, it is decided that it will be used for different purposes. Different uses of polyester film have different requirements for raw materials and additives and processing technology, and their thickness and technical indicators are also different. In polyester film (PET), only BOPET has a variety of uses, and its specific uses are as follows:

1. PET 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: 25 μm, 36 μm, 40 μm, 48 μm, 50 μm, 70 μm, 75 μm, 80 μm, 100 μm and 125 μm. These include wire and cable insulation films (25-75 μm thickness) and tactile switch insulation films (50-75 μm)

2. PET capacitive film

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

3. PET card protection film

It has good transparency, high stiffness, good thermal stability, excellent winding performance of surface smoothness, uniform longitudinal and transverse tensile performance, and excellent properties such as waterproof, oil-proof and chemical-proof. It is specially used for the protective packaging of pictures, certificates, documents and office supplies, so that it is smooth and beautiful after being stamped as a protective film, and can keep the original clear and not deformed. The commonly used standard thicknesses are 10.75μm, 12μm, 15μm, 25μm, 28μm, 30μm, 36μm, 45μm, 55μm, 65μm, 70μm, etc., of which more than 15μm is mainly used as laser anti-counterfeiting base film or high-grade card protection film.

4. PET general film

It has excellent strength, dimensional stability, cold resistance and chemical stability, and is widely used in various substrates such as composite packaging, photosensitive film, metal evaporation, audio and video recording, etc. Specifically, 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 a large tensile force, which is mainly used for packaging seals of boxed items. Commonly used standard thicknesses are 20μm, 28μm, 30μm, 36μm, 50μm, etc.

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

(3) Printing 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, etc.

(4) Aluminized film. The main characteristics are high strength, good temperature and chemical resistance, good processing and anti-aging properties, and appropriate corona treatment, which makes the adhesion of aluminum layer and film more firm. After being used for aluminization, it can be widely used in tea, milk powder, candy, biscuits and other food packaging bags, and can also be used as decorative films such as string flower handicrafts, Christmas trees and other decorations; Conventional standard thicknesses include 12 μm, 16 μm, 25 μm, 36 μm, etc.

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

5. Nano-scale PET film

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

b. High barrier performance and heat resistance: the use of nanomaterials with special properties and unique processing technology to make nanomaterials uniformly disperse in the PET matrix in nano size, through tensile orientation in the film production process, so that the PET film presents excellent barrier performance, O, CO2, H2O and other substances The transmittance rate is doubled, and the heat resistance is also greatly improved. Due to its characteristics, the application field of PET is expanded, the shelf life of the packaged material is greatly extended, and it can also be used in the hot filling or disinfection industry.