Injection molding machines are highly efficient plastic product manufacturing machines. Most common plastic products in daily life are made using injection molding, such as mobile phone cases, USB cables, and metal-coated products. From small items like circuit boards to large items like cars and ships, plastic products have permeated every aspect of our lives, greatly enriching our daily routines.
The working principle of an injection molding machine is similar to that of a medical syringe. A screw drives molten plastic material into a mold cavity, where it is pressurized, cooled, and solidified to form the final plastic product. Early injection molding machines had simple structures and limited functions, only capable of producing single-color plastic products. However, with continuous technological innovation, two-color vertical injection molding machines were developed. The working principle of a two-color vertical injection molding machine is the same as that of a single-color machine, except that an additional barrel is added. It uses two different raw materials to complete a single plastic product, thus achieving the purpose of two-color production. As consumer products become increasingly complex, the demand for three-color, four-color, and even multi-color injection molding has gradually emerged.
Besides requiring high-quality machinery, two-color injection molding also demands careful consideration when selecting molds. Two-color injection molding involves injecting different raw materials into the same mold, therefore the mold must have good wear resistance. Generally, the higher the hardness of a two-color mold, the lower the wear rate and the better its wear resistance. Secondly, the mold must have good toughness, fatigue fracture resistance, and high and low temperature resistance. In addition, good corrosion resistance can greatly improve the service life of the mold.
