Two color mold: two kinds of plastic materials are injected on the same injection molding machine, which are divided into two parts, but the product is only molded once. Generally, this kind of molding process is also called double material injection molding, which is usually completed by a set of molds and requires a special two-color injection molding machine. At present, the two-color mold is becoming more and more popular in the market. This process can make the appearance of the product more beautiful and easy to change colors without spraying, but the cost is expensive and the technical requirements are high.
1. The two shapes of the master mold are different, forming one product respectively, while the two shapes of the male mold are exactly the same.
2. After the front and back dies of the die rotate 180 o in the center, they must match. This inspection must be done in the design, which requires high positioning processing of the mold base.
3. The total thickness of front formwork panel plus a plate shall not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as maximum mold thickness, minimum mold thickness, Ko hole distance, etc.
4. The nozzle of the three plate mold should be designed to automatically demould. Pay special attention to the demoulding action of the soft rubber nozzle.
5. When designing the master mold for the second injection molding, in order to avoid the second master mold inserting (or wiping) to damage the rubber position of the first molded product, part of the master mold can be designed to avoid air. However, the strength of each sealing position must be carefully considered, i.e. in injection molding, is there any possibility of plastic deformation under large injection pressure, leading to the possibility of batch front in the second injection molding?
6. During injection molding, the product size of the first injection molding can be slightly larger, so that it can be pressed more tightly with another male mold during the second molding, so as to achieve the sealing effect.
7. Pay attention to whether the flow of plastic will impulse the products that have been molded for the first time during the second injection molding, so as to deform the glue position? If this is possible, we must find ways to improve.
8. Before closing the A and B plates, pay attention to whether the front mold slider or inclined roof will reset first and crush the product? In this way, we must find a way to make the A and B plates close the mold first, and then the slider or inclined roof of the front mold can be reset.
9. The water transport layout of the two female and male formworks shall be as sufficient as possible, and shall be balanced and the same.
10.99% of the cases are that the hard part of the product is injected first, and then the soft part of the product is injected. Because soft rubber is easy to deform.
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