Classification Of 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 be classified into each of the above categories. An extrusion blow molding machine is a combination of an extruder, a blow molding machine, and a mold closing mechanism. It consists of an extruder, a billet die head, an inflation device, a mold closing mechanism, a billet thickness control system, and a transmission mechanism. The blank mold head is one of the important components that determine the quality of blow molded products, usually consisting of a side feed mold head and a central feed mold head. When blow molding large products, the storage cylinder type blank mold head is often used. The minimum capacity of the storage cylinder is 1kg, and the maximum capacity can reach 240kg. The billet thickness control device is used to control the billet wall thickness, with a maximum of 128 control points, usually 20-30 points. The extrusion blow molding machine can produce hollow products with a volume range of 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. The common types are three station injection blow molding machines and four station injection blow molding machines. The three station machine has three stations: prefabrication, blowing, and demolding, with each station separated by 120 degrees. A four station machine has an additional pre forming station, with each station spaced 90 degrees apart. In addition, there are dual station injection blow molding machines with a distance of 180 ° between workstations. The plastic containers produced by injection blow molding machines have precise dimensions and do not require secondary processing, but the mold cost is relatively high.
A special structure blow molding machine is a blow molding machine that uses sheets, molten materials, and cold billets to blow hollow bodies with special shapes and uses. Due to the different shapes and requirements of the products produced, the structure of blow molding machines also varies.