Classification of Plastic Blow Molding Machines

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 fall into each of the above categories.

The extrusion blow molding machine is a combination of an extruder, a blow molding machine and a mold clamping mechanism. It consists of an extruder, a parison die, an inflation device, a mold clamping mechanism, a parison thickness control system and a transmission mechanism. The parison die is one of the important components that determines the quality of blow molded products. There are usually side feed dies and central feed dies. Accumulator cylinder type parison die is often used in blow molding of large products. The minimum volume of the storage tank is 1kg, and the maximum volume can be 240kg. The parison thickness control device is used to control the parison wall thickness, with a maximum of 128 control points, generally 20 to 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 components. Common types include three-station injection blow molding machines and four-station injection blow molding machines. The three-station machine has three stations: prefabricated parison, blowing and demoulding. Each station is 120° apart. The four-station machine has one more preforming station, and each station is 90° apart. In addition, there are dual-station injection blow molding machines with stations 180° apart. The plastic containers produced by the injection blow molding machine are of precise dimensions and do not require secondary processing, but the mold cost is higher.

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 structures of the blow molding machines are also different.