After experiencing the cooling process and the molten plastic melt formed the desired product, we now have to figure out how to remove part of the mold. One way is to use ejector pins (there are also using air puff, thread, etc.). The shape & dimensions vary according to need. The driving mechanism is generally driven by a pinned ejector attached to an injection machine, then the ejector pin of this machine will push the ejector plate and because the ejector pin on the mold is mounted over the ejector plate, it will automatically move according to the ejector plate movement. In addition to functioning as an ejector, sometimes the ejector pin head shaped slide slope, so it is part of the core as the forming part as an economist or it could be as a way to overcome the undercut as well as to economize. In the meantime, you may also need to check out the trusted injection mold manufacturer China.
The Molder Cooling Process
Temperature settings in the mold play an important role in the injection molding process. For example, if the mold temperature is too low, the plastic melt will freeze inside the sprue, runner & gate so that the plastic melt cannot flow into the mold. When the temperature is elevated, the engine cycle as a whole will be prolonged and uneconomical. So it can be concluded there are 3 main factors of the reasons for temperature control in the mold, namely:
(1) Set the cooling time that affects the overall cycle setting.
(2) Ensure the quality of the product made (shape & dimension).
(3) Prevent the occurrence of warpage and shrinkage due to differences in product thickness that is formed so that the stress difference in (internal stress) on the product.
The position of the cooling hole in the mold
To improve mold cooling, a mold designer should pay attention to the following:
A. Instead of making a large cooling drain hole it is better to create a small cooling duct hole but in large quantities.
B. Hard-cooled parts such as inserting blocks, core slides, product parts that have a thickness, slope slide should get more cooling than other areas.
C. Use a mold material that has good conduction heat transfer