Five injection molding processes
Also known as injection molding, its principle is to add granular or powdery raw materials into the hopper of an injection machine. The raw materials are heated and melted into a flowing state. Driven by the screw or piston of the injection machine, they enter the mold cavity through the nozzle and the pouring system of the mold, and are hardened and shaped in the mold cavity.
Factors affecting injection molding quality: injection pressure, injection time and injection temperature
Insert molding refers to a molding method in which pre-prepared inserts of different materials are loaded into the mold and then resin is injected. The molten material joins and solidifies with the insert to form an integrated product.
In the Insert Molding process, the injection molding machine is usually only one part of the entire system. Inserts usually first need to be oriented, and a vibrating table can be used to accomplish this task. The insert is then placed into the mold by a robotic end-of-arm tool (EOAT), usually with the aid of a pre-positioning device. After reaching the finished part stage, ejection positioning is the most important step. The repeatability of the mold opening action of the injection molding machine is crucial here. After the insert is closed into the mold, it is held in place under vacuum or mechanically (e.g. using slides). While the insert is inserted, the previous finished part is ejected.
Two-color injection molding refers to a molding method in which two plastics of different colors are injected into the same mold. It can make plastic appear two different colors, and can make plastic parts show regular patterns or irregular cloud-like colors to improve the usability and aesthetics of plastic parts.
It is an innovative precision injection molding technology that relies on the expansion of pores to fill the product, and completes the molding of the product under low and even pressure.
The microcellular foaming molding process can be divided into three stages: first, the supercritical fluid (carbon dioxide or nitrogen) is dissolved into the hot melt glue to form a single-phase solution; then the switch-type nozzle is used to inject the mold cavity with lower temperature and pressure. As the temperature and pressure decrease, the instability of the molecules is triggered, thus forming a large number of bubble nuclei in the product. These bubble nuclei gradually grow to form tiny holes.
NMT (Nano Molding Technology): It is a construction method that combines metal and plastic with nanotechnology. After the metal surface is nano-treated, the plastic is directly injection molded on the metal surface, so that the metal and plastic can be formed into one piece.
