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What is a two-shot mold?

What is a two-shot mold?
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Two-shot mold: two plastic materials are injected on the same injection molding machine and molded in two times, but the product is only molded once. In general, this molding process is also called double injection molding, usually completed by a set of molds, and requires a special two-shot injection molding machine. Two-shot molds are becoming more and more popular on the market. This process can make the product look more beautiful, and it is easy to change the shot without spraying, but the cost is high and the technical requirements are high.

  1. The two shapes of the female mold are different, one product is formed separately, and the two shapes of the male mold are exactly the same.
  2. After the front and rear molds rotate 180o in the center, they must be matched. This check must be done during design, which requires high positioning processing of the mold base.
  3. The total thickness of the front mold panel plus A-plate should not be less than 170mm. Please carefully check other reference data of this type of injection molding machine, such as the maximum mold thickness, minimum mold thickness, KO hole distance, etc.
  4. The nozzle of the three-plate mold can be designed to be able to automatically release the mold. Pay special attention to whether the mold release action of the soft glue nozzle is possible *.
  5. When designing the second injection of the master mold, in order to avoid the second master mold inserting (or scratching) the first time the molded product has been formed, you can design a part of the avoidance. However, it is necessary to carefully consider the strength of each sealing position, that is, whether there will be plastic deformation under large injection pressure during injection molding, resulting in the possibility of a batch front during the second injection.
  6. During injection molding, the size of the first injection molded product can be slightly larger, so that it can be pressed tighter with another male mold during the second molding to achieve the effect of sealing.
  7. Note that during the second injection, will the plastic flow impulse the first-formed product to deform its glue position? If this is possible, we must find ways to improve it.
  8. Before the A and B plates are closed, pay attention to whether the front mold slider or inclined top will be reset first and crush the product. In this way, it is necessary to find a way to close the mold on the A and B plates first, and then the slider or inclined top of the front mold can be reset.
  9. The water transportation layout of the two female molds and the male mold is as full as possible, and it is balanced and the same.
  10. In 10.99% of the cases, the hard rubber part of the product is injected first, followed by the soft rubber part of the product. Because soft glue is easy to deform

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