We engineer the mold to hold inserts firmly during injection or to align cleanly between substrate and overmold steps. For insert molding, the cavity is built to seat each insert in an exact position. For over molding, the substrate is held in a second cavity for the next shot.
For insert molding, metal or pre-formed inserts are loaded into the mold by hand for low-volume runs or by robot for high-volume programs. For over molding, the rigid substrate is molded first using standard injection molding, then placed in the overmold tool.
Material pairing matters more than any other choice. Rigid substrates like polycarbonate, ABS, polypropylene, or nylon need to bond with the overmold material. We check chemical compatibility before tooling is cut and design mechanical interlocks when bonding alone is not enough.
The press is dialed in to fill around the insert without shifting it or to bond the second shot to the substrate without burning, warping, or weak adhesion. Pressure, temperature, and timing get tuned for each program.
Each part cools long enough for the plastic to lock around the insert or bond firmly to the substrate. Finished parts go through inspection for insert position, bond strength, dimensional accuracy, and cosmetic quality. Trimming, printing, or assembly are added when your project calls for them.
