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[Chemical Knowledge]：Detection Methods and Analysis Techniques of BOPET

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As an important plastic film, polyester film (BOPET) is widely used in packaging, electronics, construction and other fields. To ensure the quality of BOPET products, we must rely on advanced detection methods and analysis technology. Let's take a look at the preparation process of BOPET. The preparation of BOPET is mainly divided into two kinds of extrusion method and stretching method, extrusion method by extruding polyester melt, and then after stretching, cooling, shaping and other processes to prepare; and stretching law is the polyester sheet at a certain temperature to stretch, forming a film. The different preparation process will directly affect the performance of BOPET film, so its quality must be evaluated by effective detection and analysis methods.

In the detection of BOPET film, physical performance testing is a key link. Among them, the thickness of the film, transparency, surface flatness, etc. are common physical performance indicators. The measurement of the thickness is usually used in the electron microscope, laser scanning and other precision instruments, through the scanning and measurement of the film, the overall thickness distribution. The transparency can be measured by a transmittance meter or the like to evaluate the transparency and optical properties of the film. The detection of surface flatness often uses a surface roughness meter to evaluate the flatness of the film surface by measuring the degree of unevenness of the film surface. The test results of these physical properties will directly reflect the preparation quality and product performance of BOPET film, and provide basic data for subsequent analysis.

In addition to physical performance testing, chemical performance analysis is also one of the important means to evaluate the quality of BOPET film. In the analysis of chemical properties, it mainly includes the detection of film components, additives and pollutants. For example, the composition of the film can be analyzed by infrared spectroscopy to determine whether it contains impurities or additives. The thermal stability of the film can also be tested by a thermogravimetric analyzer and other equipment to evaluate its performance in a high temperature environment. It is also very important to detect the adhesion and pollutants on the surface of the film, and the qualitative and quantitative analysis can be carried out by means of surface contact angle test and X-ray photoelectron spectroscopy analysis.

The detection method and analysis technology of BOPET film is an important guarantee to ensure its quality stability. Through physical performance testing and chemical performance analysis, we can fully understand the preparation process and performance of the film, and provide a scientific basis for quality control in the production process. With the continuous progress of technology, I believe that in the future, the detection methods and analysis techniques for BOPET film will be more perfect, and open up a broader space for the development and application of BOPET products.

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