Other Requirements For Medical Injection Mold Processing
Aug 16, 2021
18. The two shapes of Cavity are different, and one product is formed separately. And the two appearances of the Core are exactly the same.
19. After the front and back molds of the mold are rotated 180° from the center, they must be matched. This check must be done during design.
20. Pay attention to the position of the thimble hole, the minimum interval is 210mm. Large molds must appropriately increase the number of top rod holes. Moreover, because the ejector pin attached to the injection molding machine itself is not long enough, we must design an extended ejector pin in our mold. The ejector pin is about 150mm out of the base of the mold base.
21. Two positioning rings must be designed on the bottom plate of the back mold.
22. The total thickness of the front mold panel plus A plate cannot be less than 170mm. Please carefully check the other reference data of this type of injection molding machine, for example, the maximum mold thickness, the minimum mold thickness, the spacing of the top rod holes, etc.
23. The depth of the front SPRUE should not exceed 65mm. The distance between the top of the SPRUE on the upper side (large nozzle) and the center of the mold base is not less than 150mm.
24. When designing the CAVITY for the second injection, in order to prevent the CAVITY from inserting (or scratching) the glue position of the first molded product, a part of the space can be designed. However, it is necessary to carefully consider the strength of each sealing position, that is, in injection molding, whether there will be deformation of the plastic under the large injection pressure, which may lead to the possibility of cracking in the second injection.
25. During injection molding, the size of the first injection molded product can be slightly larger, so that it can be pressed tighter with another CAVITY during the second molding to achieve the role of sealant.
26. Before closing the A and B boards, pay attention to whether the front mold Slider or Lifter will reset first and crush the product? In this way, it is necessary to find a way to close the molds on the A and B boards first, and then the SLIDER or LIFET of the front mold can be reset. Zhenye Injection Molding Consulting focuses on improving and upgrading services for injection molding factories.
27. The water transportation arrangement of the two CAVITY and CORE is as adequate as possible, and balanced and the same.
28. In 99% of cases, the hard part of the product is injected first, and then the soft part of the product is injected. Because the soft glue is easy to deform.
29. Pay attention to the second injection, can the movement of the plastic impulse the product that has been molded the first time, causing its glue position to be deformed? Assuming it is possible, we must think of ways to improve.
