Polyester film is a raw material of this kind of plastic film. It is made of ethylene phthalate as raw material. It has the characteristics of high rigidity, strength and ductility, puncture resistance and abrasion resistance. Polyethylene terephthalate is used as the raw material, and the plastic film raw material made by extrusion method is used as a thick film and then cross-drawn.
This is a crystal clear, glossy plastic film with high physical properties, high stiffness, strength and ductility, puncture resistance, abrasion resistance, heat resistance and ultra-low temperature, chemical resistance, oil resistance and sealing. It has excellent aroma retention and is the fourth of the common barrier composite plastic film sheets. However, the price of polyester film is relatively high, usually 13 mm thick. It is commonly used as a surface material for steamed packaging, and the package printability is good.
The price of polyester film is relatively high, and the thickness is usually 0.012 mm. It is commonly used as a surface material for steamed packaging, and the package printing property is good. Moreover, because of the diversity and difficulty of distinguishing polyester film, it is at least difficult to control China Customs.
It is classified according to the main use of polyester film because the characteristics of polyester film determine its different main uses. Different main polyester films have different regulations on raw materials and preservatives and their manufacturing processes, and their thickness and performance are different. On the other hand, only BOPET can have a variety of main uses, so The plastic film classified for the main purpose is all BOPET. Can be divided into the following categories:
1. Welder insulation film. Because it has excellent household appliances, mechanical equipment, thermal and organic chemical plasticity, good dielectric strength, high puncture resistance, special-purpose thermal materials for electronic devices and electrical equipment, common specifications are: 20μm, 41μm, 50μm 47 μm, 60 μm, 75 μm, 70 μm, 90 μm, 150 μm, and 250 μm (mm). It mainly includes cable wire insulation film (thickness 20-70μm) and touch switch insulation film (60-70μm).
2. Capacitor film. It has high tensile strength, high thermal conductivity, low loss factor, strong thickness and good symmetry, excellent mechanical strength and large electrical friction resistance. It has been widely used for capacitive media and insulation sandwich. Common specifications are 3.6 μm, 3.9 μm, 4 μm, 3.2 μm, 4.5 μm, 5 μm, 6 μm, 8 μm, 9 μm, 9.8 μm, 12 μm, and 13 μm.
3, card film. It has the characteristics of good definition, good stiffness, good heat and smoothness, excellent surface smoothing, well-balanced horizontal and vertical tensile properties, and excellent characteristics such as moisture resistance, oil resistance and chemical resistance. The special type is used for the maintenance and packaging of photos, valid documents, documents and office equipment, so that it can be flat and beautiful after being used as the original film, and can maintain the clarity and non-deformation of the copy. Common specifications are 10.75μm, 13μm, 16μm, 20μm, 29μm, 40μm, 41μm, 46μm, 56μm, 63μm, 75μm, and at least 16μm is the key for laser anti-counterfeit base film or high-end card film application.
4. Universal membrane. It has excellent compressive strength and specification reliability, cold resistance and organic chemical reliability. It is widely used in various types of plates such as composite packaging, light-sensitive film, metal material evaporation, and simultaneous recording and recording.
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