Like two-shot molding, over-molding uses two different and compatible materials. This multi-shot process combines these to create parts that won’t easily separate as time progresses. The first material used is usually of a more rigid quality to withstand the overmolding process. After the mold is injected with the first substrate and cools, it is then transferred to to either an overmold tool or an overmold cavity within the same tool. Then the machine injects the second substrate over, into, or around the first. If necessary, the two substrates are then bonded either chemically or mechanically to provide a more stable product after cooling.
Over-molding usually suits low-volume or on-demand projects. Engineers often use overmolding because it is easier for design as they can fit in just about any standard injection molding machine for this process. Also, this process often costs less as it utilizes the same machinery of traditional molding options but with fewer transfers to different machines.
To see this in action, Seaway has a YouTube channel that shows how that’s done. Click here.
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