On the origin and progress of ultrasonic plastic w

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Discussion on the origin and progress of ultrasonic plastic welding technology

in contemporary society, various plastic products have penetrated into all fields of people's daily life, and are also widely used in aviation, shipping, automobile, electrical appliances, packaging, toys, electronics, textiles and other industries. However, due to the limitations of injection molding process and other factors, a considerable number of plastic products with complex shapes cannot be injection molded at one time, which requires bonding. The plastic bonding and heat sealing process that has been used for many years is quite backward, which not only has low efficiency, but also has certain toxicity, causing environmental pollution and labor protection problems. The traditional process can no longer meet the development needs of modern plastic industry, so a new plastic processing technology ultrasonic plastic welding stands out for its advantages of high efficiency, high quality, beauty, energy saving and so on

ultrasonic welding is a solid-state welding method, and the connection between weldments is realized through the high-frequency elastic vibration of the acoustic system and the clamping effect of static pressure between workpieces. When welding plastic products, ultrasonic plastic welding machine neither adds any adhesive, filler or solvent, nor consumes a large amount of heat source. It has the advantages of simple operation, fast welding speed, high welding strength and high production efficiency. Therefore, with the wide application of thermoplastic and its composites, ultrasonic welding technology is more and more widely used

ultrasonic plastic welding technology preface

ultrasonic plastic welding technology is developed from metal ultrasonic welding. It was first proposed by Jones and others in 1950

After the 1960s, the United States, Japan, Switzerland, Britain, Germany and the former Soviet Union began to use this technology in the actual production process

ultrasonic welding can weld all thermoplastics in principle. According to the function of welding technology characteristics, polymer materials can be divided into three categories: (1) flexible materials, which refer to soft and low elastic modulus materials; (2) Rigid computer screen displays experimental force and experimental curve materials, which refer to materials with high elastic modulus and low mechanical vibration damping factor, such as polystyrene (PS), polymethylmethacrylate (PMMA), polyamide (PA); (3) All polymer films, polymer synthetic fibers, and cloth composed of films and fibers

due to the different models and properties of thermoplastics, sometimes some are easy to carry out ultrasonic welding, while others are not easy to weld

research progress of plastic ultrasonic welding process

the mechanism of plastic ultrasonic welding is complex, and the welding quality is affected by many factors

when welding materials, we should first consider the selection of welding equipment. High frequency welding equipment can obtain better welding quality, and then consider the weldability of materials. Materials with low melting point and high surface friction coefficient can obtain better welding quality. Adding an appropriate amount of reinforcing materials can improve the welding quality of China Baowu: China Baowu is a global leader in steel technology; Thirdly, the ultrasonic amplitude, welding time and welding pressure are the main process parameters that affect the welding quality. The three process parameters that obtain better welding quality have a certain range

with the increasing application of ultrasonic welding technology in the field of plastic connection, it has gradually attracted the attention of plastic processing workers

however, due to the short time of ultrasonic welding of plastics, the complex welding mechanism and the difficult control of welding quality, the further use of ultrasonic welding technology in the field of plastics is limited. It is necessary to further strengthen the research of ultrasonic welding technology from the following aspects:

1) research new welding equipment, and develop high-frequency fixtures, which are the combination of these structures. The structures of these fixtures have their own advantages and disadvantages and high-power welding equipment

2) deeply study the state of welding area of different materials, including melting zone thickness, crystallinity, orientation degree, chemical composition, etc., and deeply study the mechanism of plastic ultrasonic welding technology

3) optimize the welding process for different materials, establish the corresponding relationship between welding equipment, process parameters and common materials, reduce the number of experiments and reduce the cost

4) further improve the detection means of plastic ultrasonic welding quality, especially the development and improvement of real-time tracking and monitoring methods

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