The structures and tolerances of insert molds from Aline Components, Inc. rival machined parts and demonstrate excellent dimensional stability without the need for additional fasteners, adhesives, or other assembly methods. As a preferred thermoplastic injection molding and manufacturing company, Aline Components employs state-of-the-art injection molding equipment for dependable custom plastic part or component solutions.
Insert molding, also referred to as over-molding, is a thermoplastic injection molding process in which thermoplastic materials are injected around another core material. The core material can be another polymer, a ceramic preform, or a metal component. The insert molding process allows multiple components to be placed within a cavity or part in a single thermoplastic injection molding operation.
In insert molding it is critical that the insert and the thermoplastic material be compatible for the melt bond to occur at the interface between the two materials. Several factors, including interface temperature, cleanliness of the insert, and melt temperature, can affect the strength of the bond. At Aline, we have established many techniques to create reliable, long-lasting bonds.
We are able to improve bond strength by preheating the insert and ensuring that the surface of the insert is free from dirt, grease, or oil. For non-compatible materials, we can apply an adhesive to the insert. Another way we combine incompatible materials is by designing parts with mechanical locks so the molten thermoplastic material flow into the locking area to create a secure bond.
Generally, insert molding is designed for complex parts that cannot be produced via other thermoplastic injection molding processes. Inserts are used extensively in a variety of custom plastic parts or components to provide support for bearings and shafts, internal and external threaded sections, thermal or electrical conductivity, anchorage, positioning studs, reinforcement, hinging, terminals, nameplates, magnetic laminations, and other functional or decorative needs. Click here for more information on types of inserts and other insert molding applications.