WHAT IS INSERT MOLDING?
Insert molding is a process that starts with placing metal, ceramic, or plastic parts into the plastic injection mold. After those parts have been properly placed, the mold is filled with molten plastic in the regular injection molding process. Once the plastic has cooled, the inserted parts are now firmly bound to, and integrated into, the plastic parts. There are many options for inserts that can be placed into the mold. Threaded bushings, wires, batteries, and warning labels are a few examples.
Support
Whether you are using metal, ceramic, or plastic inserts, one of the biggest considerations is that you have enough material to support your inserts. Having too thin of walls will lead to the insert breaking away from the rest of the part. This can happen during production or during the use of the part. You need to make sure there is enough plastic material to house the insert properly.
Temperature
This consideration is more of an issue when using plastic inserts. You will want to make sure that the inserts you are using in the mold can safely be exposed to the temperature required to melt the plastic injection material without deforming your inserts. If your inserts can't handle the temperature required to melt the plastic material, you will want to see if a different plastic material with a higher melting point to be safely used in your part.
Pressure
The other consideration for insert molding is whether or not your inserts can handle the pressure. The amount of pressure generated during the plastic Injection Molding process is very intense. You need to make sure that the inserts can withstand this pressure without cracking or deforming.
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