Injection Blow Molding Machine is the intersection betw […]
Injection Blow Molding Machine is the intersection between injection molding and blow molding. The process of injection blow molding can be divided into three steps. The first step is to inject the hot melt plastic into the cracked steel mold by means of a screw extruder. The mold creates a preform, which looks like a test tube with a top screw. In the second step of injection blow molding, the preform is placed on a mandrel and then placed in another cold blow mold, usually made of aluminum. The air is blown from the core lane into the container until the material comes into contact with the cold wall of the mold, exhibiting its shape and becoming rigid. Is still on the core stick, and then you move the container in step 3 to another location where the machine injects the desired content.
After the liquid plastic sprayed out, the use of the wind blown out of the machine, the plastic body will be attached to a certain shape of the cavity, and thus made of products, this machine is called injection blow molding machine. The plastic is melted and quantitatively extruded in a screw extruder, then passed through the mouthpiece, and then the wind blows, and then the tractor is pulled at a certain speed, and the winder is wound into a roll.
Injection blow molding machine is a combination of injection molding machine and blow molding mechanism, including plasticizing mechanism, hydraulic system, control electrical and other mechanical parts. Common types are three-position injection blow molding machines and four-station injection blow molding machines. Three-position machine with prefabricated parison, inflatable and stripping three stations, each station separated by 120 °. Four-station machine is more than a pre-forming station, each station separated by 90 °. In addition, there are double-bit injection blow molding machines separated by 180 °. Injection molding machine production of plastic containers size is accurate, no secondary processing, but the higher cost of mold.
In the process of blown film production, the film thickness uniformity is a very important indicator, in which the thickness of the vertical uniformity can be squeezed and traction speed stability to be controlled, and the film thickness uniformity is generally resistant to die-based precision manufacturing , And with the production process parameters change, in order to improve the thickness of the film thickness uniformity, the need to introduce automatic horizontal thickness control system, commonly used control methods are automatic die (thermal expansion screw control) and automatic air ring.