Injection molding is a common, cost-effective method for manufacturing parts, but, sometimes, those parts need a little help. Low impact or vibration resistance, slippery surfaces, poor ergonomics, and cosmetic concerns are only a few of the reasons why a second molded part is often added as a grip, handle, cover, or sleeve.
The process of rapid overmolding will get the job done. This method, which Proto Labs now offers, and is the focus of our October design tip, uses a mechanical or chemical bond (or both) to permanently marry two parts together.
This month’s tip discusses:
- Bonding: A strong bond between the two materials is critical to overmolding.
- Materials: This is a key consideration in overmolding.
- Principles: Overmolding uses the same playbook as injection molding, but with a few quirks.