Blow molding is a common plastic processing technique, also known as blow molding. It is by heating the thermoplastic to a melting state, and then injected into the mold and compressed air as the driving force, so that the plastic in the mold expansion, forming and get the desired shape.
The origin of blow molding technology can be traced back to the 1940s. At that time, the production of plastic bottles required the thermoplastic material to be made into a tube, and shaped into a "back cover" at one end, and then the tubular melt was closed so that it was connected to the "back cover". In the subsequent development and evolution, blow molding processing technology has gradually become an independent technical system.
Blow molding processing technology is divided into two types: injection blow molding and extrusion blow molding. Injection blow molding uses an injection machine to shoot dissolved plastic into a hollow preform, and then expands the plastic in the preform through the action of compressed air to form the desired shape. This technique is suitable for the production of smaller bottles or containers. Extrusion blow molding is the process by which molten plastic is extruded from the extruder into a tube, which is then expanded in the mold by the action of compressed air to form the desired shape. This technique is suitable for the production of larger bottles or containers.
Blow molding technology has many advantages. First of all, the production cycle is short, and a large number of products can be produced efficiently. Secondly, the product size range is wide, and bottles or containers of various shapes and sizes can be produced. In addition, blow molding products have good physical properties, such as wear resistance, pressure resistance, corrosion resistance, etc., and the cost is relatively low. Therefore, blow molded products are widely used in daily life, such as beverage bottles, shampoo bottles, cosmetics bottles and so on.
Of course, blow molding technology also has some limitations. First of all, the fluidity of the melt has an important impact on the quality of the blow molding process. Secondly, the shape and size of the product are relatively simple, and it is difficult to meet the complex design requirements. In addition, the hardness and rigidity of blow molded products are relatively low, and are not suitable for some demanding fields.
In order to improve the efficiency and quality of blow molding processing technology, many enterprises have adopted automation equipment and advanced process control technology. For example, the automatic die turntable system enables fast, accurate, continuous and stable production. At the same time, the use of advanced mold design and manufacturing process can improve the precision and surface quality of the product. In addition, by optimizing process parameters, such as temperature, pressure, etc., the performance and consistency of the product can be further improved.
In short, blow molding technology has a wide range of application prospects in the field of plastic products processing. With the continuous development of science and technology, blow molding processing technology will be better improved and perfected, bringing more convenience and choice to people's lives.
