Two-color Mold Injection Molding Technology And Working Principle

A two-color mold usually has two molds, one half is installed on the fixed mold fixing plate of the two-color mold injection molding machine, that is, the side with the injection gate, and the other half is installed on the movable mold rotating plate, that is, the side where the mold is ejected. The movable molds of these two molds are generally exactly the same, but the primary fixed mold and the secondary fixed mold are different. After the injection of the first material is completed, the fixed and movable molds are opened under the pulling force of the injection molding machine, and the primary movable mold rotates 180° with the primary product. At this time, the movable mold does not eject, and then the mold is closed to inject the second material. After insulation and cooling, the fixed and movable molds are opened, and the product on the movable mold side is ejected. In each molding cycle, one mold primary product and one mold secondary product will be produced.
1. The two shapes of the front mold are different, forming one product respectively, while the two shapes of the rear mold are exactly the same.
2. The front and rear molds of the mold rotate 180 degrees with the center, and the front and rear must be matched during rotation. This inspection action must be done during work, because this point has high requirements for mold frame positioning processing. The total thickness of the front mold panel plus the A plate should not be less than 170mm. This requires careful inspection of the injection molding machine model and other reference data.
3. The sprue of the three-plate mold should preferably be designed to be able to automatically demold, so that it will be more convenient to work. Pay special attention to whether the demolding action of the soft glue sprue is reliable.
4. When designing the mother mold for the second injection molding, in order to avoid the second mother mold from scratching the glue position of the first molded product, a part of the airtight can be designed. However, the strength of each sealing position must be carefully considered, that is: during injection molding, will the plastic be deformed under high injection pressure, resulting in the possibility of batching in the second injection molding.
5. During injection molding, the size of the product molded by the first injection molding can be slightly larger, because it can be pressed more tightly with another male mold during the second molding to achieve the effect of sealing. And pay attention to whether the flow of plastic will impulsively affect the first molded product during the second injection molding, causing its glue position to deform? If this is possible, you must find a way to improve it.
6. Before closing the mold of plates A and B, pay attention to whether the slider or inclined top of the front mold will reset first and crush the product. In this case, you must find a way to close the mold of plates A and B first, and then the slider or inclined top of the front mold can reset. The water supply arrangement of the two front and rear molds should be as sufficient as possible, and balanced and the same.