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Biaxially oriented polyester film, as an important functional material, is widely used in various fields. It is made of polyester as the main raw material and processed by biaxial stretching. It has excellent physical and process properties and is widely used in packaging, printing, electronics, construction and other industries. Below we will introduce in detail the characteristics, production process and main application fields of biaxially oriented polyester film.
Excellent mechanical properties: Biaxially oriented polyester film has good tensile strength and tear resistance, can withstand large tensile forces without breaking easily, and has high wear resistance and durability.
Excellent optical properties: The film has high transparency and gloss, which can effectively display the appearance and packaging effect of the product, enhancing the attractiveness and competitiveness of the product.
Good heat sealing performance: Biaxially oriented polyester film has good heat sealing performance and is suitable for a variety of heat sealing packaging equipment, ensuring the sealing and freshness preservation of packaging bags.
Excellent chemical stability: The film has good chemical stability, is acid and alkali resistant, and corrosion resistant, and can maintain stable performance in various harsh environments.
The production process of biaxially oriented polyester film generally includes the following steps:
Raw material preparation: Select high-quality polyester resin as raw material, and carefully design and mix the formula to ensure stable quality of raw materials.
Extrusion: The pre-mixed polyester resin is extruded into film sheets through an extruder to form a preliminary film.
Biaxial stretching: After the extruded film sheet is heated, it is stretched through a biaxial stretching machine to produce stretch deformation in both the length and width directions, thereby improving the strength and transparency of the film.
Cooling and solidification: After stretching, the film sheet is cooled and solidified to maintain the required shape and performance.
Cutting and packaging: Finally, the film is cut and packaged into finished rolls or sheets to facilitate subsequent transportation and use.
Packaging industry: Biaxially oriented polyester film is often used in the packaging of food, medicine, cosmetics and other products, such as transparent packaging bags, cling film, heat shrink packaging film, etc., which can effectively protect products from contamination and damage.
Printing industry: Due to its excellent optical properties and smoothness, biaxially oriented polyester film is also often used as printing materials, such as advertising posters, book covers, color prints, etc., which can display clear and full patterns and text.
