Blow molding machines can be divided into three categor […]
Blow molding machines can be divided into three categories: extrusion blow molding machines, injection blow molding machines and special structure blow molding machines. Stretch blow molding machines can belong to each of the above categories. Extrusion blow molding machine is a combination of extruder, blow molding machine and mold clamping mechanism, which is composed of extruder, parison die, inflation device, mold clamping mechanism, parison thickness control system and transmission mechanism. The parison die is one of the important components that determine the quality of blow molded products, and there are usually side feed die and central feed die. When large-scale products are blow-molded, the storage cylinder type billet die is often used. The storage tank has a minimum volume of 1kg and a maximum volume of 240kg. The parison thickness control device is used to control the wall thickness of the parison. The control points can reach up to 128 points, generally 20-30 points. The extrusion blow molding machine can produce hollow products with a volume ranging from 2.5ml to 104l.
Injection blow molding machine is a combination of injection molding machine and blow molding mechanism, including plasticizing mechanism, hydraulic system, control electrical appliances and other mechanical parts. Common types are three-station injection blow molding machine and four-station injection blow molding machine. The three-station machine has three stations: prefabricated parison, inflation and demoulding, and each station is separated by 120°. The four-station machine has one more preforming station, and each station is 90° apart. In addition, there is a double-station injection blow molding machine with a 180° separation between stations. The plastic container produced by the injection blow molding machine has precise dimensions and does not require secondary processing, but the cost of the mold is relatively high.
The special structure blow molding machine is a blow molding machine that uses sheets, molten materials and cold blanks as parisons to blow mold hollow bodies with special shapes and uses. Due to the different shapes and requirements of the products produced, the structure of the blow molding machine is also different.
Advantages of blow molding machine
1. The screw central shaft and cylinder are made of 38CrMoAlA chromium, molybdenum, aluminum alloy through nitrogen treatment, which has the advantages of high thickness, corrosion resistance and wear resistance.
2. The die head is chrome-plated, and the screw spindle structure makes the discharge more even and smooth, and better completes the blown film. The complex structure of the film blowing machine makes the output gas more uniform. The lifting unit adopts a square frame platform structure, and the height of the lifting frame can be automatically adjusted according to different technical requirements.
3. The unloading equipment adopts peeling rotating equipment and central rotating equipment, and adopts a torque motor to adjust the smoothness of the film, which is easy to operate.