Blowing machines are almost all used to blow raw materi […]
Blowing machines are almost all used to blow raw materials (ie plastics). Basically, resin is used as raw material. The production of polypropylene-based resin extrusion blow molding raw materials (ie plastic) is: firstly, polypropylene resin And some auxiliary materials (such as color masterbatch) are metered separately according to the formulation requirements.
The mixture is stirred and evenly mixed, put into plastic extruder and plasticized and melted, and the tubular parison is extruded from the molding die, and then immediately placed in the mold cavity of the molded product, and compressed air is blown to inflate the parison. After cooling and setting, the bottle product is exactly the same as the mold cavity. When the raw material is plasticized and melted, the process temperature should be controlled within the range of 170-230 °C. The blown expansion ratio of the blank tube blow molded bottle product is controlled within the range of (1.5-3):1. The compressed air pressure of the expanded tube forming bottle product is 0.3 to 0.6 MPa. The mold temperature of the molding bottle is 20-50 ° C, and the cooling setting time accounts for 50%~60% of the total time of the product start production cycle.
Also note the principle of temperature setting of the plastic extruder. The basic temperature of the machine head is set according to the requirements of the base material (ie plastic), and then adjusted according to the extrusion of other layers. At several melt recombination sites requiring different temperatures, the temperature is set according to the requirements of the base material (ie, plastic), and then adjusted according to the requirements of the functional layer and the bonding layer.