Insert molding

What is Insert Injection Molding?

Insert injection molding is the manufacturing process of installing inserts into the plastic part during the plastic injection molding process. First inserts are placed in the mold, then molten plastic is injected into it and allowed to harden. After the plastic is cooled, the part is ejected out with the inserts and plastic forming one piece. Insert Molding replaces metal and plastic assemblies, and components made solely of plastic or metal. This unique manufacturing process combines metal and plastic, ceramics, or multiple combinations of materials, components and plastic into a single unit.


Insert Injection Molding Manufacturing Services

Stebro Mold uses the most-advanced quality Engel Vertical Injection molding machines for the insert injection molding process because the process requires extremely tight tolerances to ensure the proper formation of the plastic parts being created. The inserts used for plastic insert molding are typically made from brass, steel or stainless steel and have a threaded surface to provide better adhesion to the plastic. Screw machine parts, metal stampings, photochemically etched parts, cold headed parts, die cut plastic parts, insulated wires, flexible circuits, lead frames, ceramic, phenolic or composite insulators, are only a few of the insert varieties that we work with.

Our Insert Injection Molding Services includes:

  • Procurement of Inserts

  • Part Design Assistant on the insert molded plastic parts

  • Mold Design and Mold Manufacturing for the Insert Injection Mold

  • Plastic Material Selection for Insert Molding

  • Insert Molding for the Mass Production


Benefits of Insert Molding Process

  • Reduced assembly Time and labor costs

  • Reduction of part size and weight

  • Enhanced product design flexibility

  • Increased flexibility for more complex shapes and components

  • Increased reliability by eliminating adhesives and fasteners

  • Higher strength and durability, Improved strength and structure

  • Product consistency

  • Repeatable high tolerance


Insert Molding Design Considerations:

The rules of insert molding are no different from those of standard injection molding. Maintain proper draft angles, keep wall thicknesses consistent, eliminate undercuts, and avoid unnecessary part features and superfine surface finishes whenever possible. This is all good advice, and applies equally to insert molding. However, there are many factors for mold design engineers to consider when designing or constructing a mold for insert molding. Some of the main considerations include:Evaluating Material Bonding and Adhesion, Ways to hold the insert during the molding process and so on.


Call the Insert Molding Experts at Stebro Mold Today

Contact us for more information regarding our insert injection molding capabilities or Request a Quote Today.