Manufacturing method of BOPET film
I. Introduction
BOPET (biaxially oriented polyester) film is a widely used raw material for the production of chemicals, with excellent physical properties and chemical stability, and is widely used in the fields of packaging, electronics, electrics, and medical treatment. This article will detail the manufacturing method of BOPET film.
II, raw material preparation
BOPET film's main raw material is polyester chips, usually using polyethylene terephthalate (PET) chips. In the manufacturing process, it is also necessary to add some additives, such as antioxidants, antistatic agents, etc., to improve the performance of the film.
III. Bi-directional stretching process
1. Pretreatment: Polyester chips are heated to a certain temperature in a preheater to make them melt, and necessary additives are added at the same time, and then filtered out by a filter to remove impurities.
2. Extrusion: The pretreated polyester melt is extruded through the extruder head to form a sheet of a certain thickness.
3. Longitudinal Stretching: The extruded sheet is stretched through a longitudinal stretching device to increase its length and improve its longitudinal strength.
4. Transverse Stretching: The longitudinally stretched sheet is then fed into the transverse stretching device for transverse stretching to increase its width and improve its transverse strength.
5. Heat-setting: After bi-directional stretching, the film enters the heat-setting device to stabilize its molecular structure through high temperature to obtain the required physical properties and chemical stability.
4. Winding and slitting
After heat-setting, the BOPET film is wound into rolls, and then slit according to customers' requirements to get products of different widths and lengths.
V. Quality Control
During the manufacturing process, it is necessary to carry out strict quality control of various performance indexes of BOPET film, such as thickness, strength, transparency, heat shrinkage, etc.. At the same time, it is also necessary to monitor the environment and equipment in the production process to ensure product stability and consistency.
VI, environmental protection and sustainable development
With the improvement of environmental awareness and the requirements of sustainable development, the manufacturing process of BOPET film also needs to consider environmental protection and sustainable development. For example, environmentally friendly additives and raw materials can be used, the production process can be optimized, energy consumption and waste emissions can be reduced, and the utilization efficiency of resources can be improved.
VII.CONCLUSION
The manufacturing method of BOPET film involves a number of links and processes, and it is necessary to strictly control the quality and environmental factors in each link to ensure the performance and quality of the product. At the same time, it is also necessary to pay attention to environmental protection and sustainable development, and promote the green development of the field of raw materials for chemical production.
