Application and Optimization Technology of Automatic Draw-Down Applicator in Preparative Polyester Film

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This article describes the application of automatic squeegee coater in the preparation of polyester film. Firstly, the wide application of polyester film in packaging, electronic products, optical film and other fields, as well as the importance of scraping technology in film preparation, were introduced. Then, the working principle and structure of the automatic scraping machine are described in detail. Then, the optimization of operating parameters in the preparation of polyester films, including scraping speed, scraping pressure and blade angle, was discussed. Finally, the application effect of automatic squeegee coating instrument in the preparation of polyester film and its potential application in industrial production are demonstrated through experimental cases.

1. Introduction

Polyester film is a common plastic film with excellent physical and chemical properties, and has a wide range of applications in packaging, electronic products, optical films and other fields. Scraping technology is a commonly used film preparation method, which can achieve efficient and uniform film coating, so it plays an important role in the preparation of polyester films.

2. The application of polyester film in various fields

Polyester film is widely used in packaging materials, electronic products, optical films and other fields. For example, PET film is often used in food packaging, screen protectors for electronic products, protective films for optical lenses, etc. Due to its excellent transparency, strength and heat resistance, polyester film has an irreplaceable position in these fields.

3. The working principle and structure of the automatic squeegee coater

Automatic scraping instrument is a special equipment for film coating, which is usually composed of coating system, scraping system, control system and other parts. The working principle is to evenly coat the paint on the substrate surface through the scraper on the coating head, and then adjust the parameters such as scraping speed, scraping pressure and blade angle through the control system.

4. Optimization of operating parameters in the process of preparing polyester films

4.1 Scraping speed

The scraping speed directly affects the uniformity of the coating distribution on the substrate surface and the thickness of the coating film. Higher scraping speeds can lead to overstretching of the paint, while lower speeds can lead to insufficient coating thickness. Therefore, it is necessary to adjust the scraping speed according to the rheology of the coating and the adsorption of the substrate.

4.2 Scraping pressure

Scraping pressure is the force exerted on the scraper during the scraping process, which affects the thickness and uniformity of the coating on the substrate surface. Proper squeegee pressure can ensure the compactness and adhesion of the coating, but excessive pressure may cause damage to the scraper and substrate. Therefore, it is necessary to adjust the scraping pressure according to the viscosity of the coating and the hardness of the substrate.

4.3 Blade angle

The angle of the blade affects the thickness and uniformity of the coating on the substrate surface. A smaller blade angle can produce a thicker coating, while a larger angle will produce a thinner coating. Therefore, it is necessary to select the appropriate blade angle according to the viscosity of the coating and the adsorption of the substrate.

5. Experimental case: the application of automatic scraping instrument in the preparation of polyester film

In the experiments, we used an automatic squeegee to evenly apply different concentrations of polyester paint to the substrate surface and optimize the coating process by adjusting parameters such as squeegee speed, squeegee pressure and blade angle. The results show that the optimized polyester film has good thickness uniformity and transparency, which is suitable for various industrial application needs.

6. Conclusion

The automatic squeegee coater plays an important role in the preparation of polyester films, which can achieve efficient and uniform coating results. By optimizing the coating parameters, polyester films with good performance can be obtained, which promotes the development and application of the manufacturing industry.