![]() However, compression molding is a lower-pressure production method, so the tooling costs are often lower. Injection molding requires a shorter cycle time than compression molding, so it’s often faster and more cost-effective if you need to produce a large number of parts. Injection molding is typically a better choice for more complex parts, while compression molding is a great option for relatively simple designs, including ultra-large basic shapes that cannot be produced using extrusion techniques. Today’s manufacturers frequently use both compression and injection molding but for different types of parts. In compression molding, molds are closed around the charge, and in injection molding, the charge is injected into a closed mold cavity. Injection MoldingĬompression molding and injection molding are very similar, but they have one major difference. Release part - Remove the finished piece.Ĭlean part - Resin flash around the edges must be manually cut off or removed, and the part may need to be cleaned before the final assembly.Ĭompression Molding vs. Many manufacturers also use heat during the compression process, which softens the raw materials and can help speed up production. Insert charge - Place the charge in the center of the bottom mold.Ĭompress part - Close the top mold, apply pressure, and wait for your piece to form. If your charge is too big, excess material will seep out of the mold and result in flash that you will need to manually cut off. Prepare charge - Selected the type of material you want to use and determine the proper amount of material. ![]() Set up the machine - Depending on the specific machine or device you’re using, this may include cleaning the mold, turning on the heat, and other set-up processes. The step-by-step compression molding process works as follows:Ĭreate molds - Tooling can be produced in a number of ways, including machining, die casting, 3D printing.
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