• Tooling Design Two-stage ejection Mechanism

    What is double ejection? Some complex plastic parts often have undercuts that are too deep to be ejected directly by neither lifters nor slides.  After ejection, the molding parts may still rest on top of the ejector pins,so another stage of ejection is needed to clear the parts. This typical solution is called double ejection system which  s can be a mechanical system driven or supplemented by air or hydraulics.   Second ejection mechanism: Add an extra set of ejector plate. The first set of ejector plate that is attached to the A plate(referred as Ejector Assembly A) is to complete the first stage of ejection while the ejector plate attached to B plate (referred as Ejector Assembly B)  is to complete the second stage of ejection as shown in Figure1. Figure 1 Add series of springs or nylon plugs to make sure that both ejector assembly A and B are attached…

    Mold design June 23, 2021
  • Sourcing Plastic injection molds from China 101, Part 1: characteristics of tooling companies from China

    Are you trying to find a plastic injection mold manufacturer in China who is well-suited to your needs and can also deliver on their promises?And if you are new to sourcing from China, the first thing you should do is to overview the internal characteristics of tooling companies for better understanding and support of proposed business models. Here are the questions you should ask before asking quote from a tooling shop in China. Is the tooling shops foreign invested or Taiwan/HK Invested or Private ? This is an important question as the type of the company may impact your mold cost greatly. In general, there are 3 types of mold companies and each has their advantage and disadvantages. A. Starting from 1990s, many US and European plastic tooling companies started building their own facility in China according to their industry standard. In early stage, larger plastic factories were mostly founded by entrepreneurs from Western countries. In terms…

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