11/23/2023 0 Comments Peek plastic injection mouldingGenerally, TPE, TPU or silicone rubber are most suitable for overmolding. The most commonly used plastic grades for substrates include PC/ABS, ABS, Nylon and PBT. If they’re compatible, the rubber-like material basically fuses to the plastic, like glue, to create a strong bond. ![]() Materials choice is the first and most important consideration in any overmolding project because selecting compatible grades can create a chemical bond between the two materials. Though the two main types of overmolding are different, these guidelines apply to both. That’s why it’s best suited for higher production quantities, where the unit cost is the main consideration. A single tool is needed in this method, though the tooling is relatively complex and more expensive than insert overmolding. These injection molding presses are equipped with two barrels, as opposed to the standard single barrel, and can mold two different materials at once. (Fun fact - 2K comes from the German “zwei komponeten” meaning two components). ![]() Two-shot overmolding is also known as multi-material or 2K overmolding. Insert overmolding requires two separate molds, one for the substrate and another for the overmold. Insert overmolding (also known as “pick and place” overmolding) is where a substrate is placed into a mold and the overmolding material is injected over the substrate - this method is most commonly used by Fictiv. Factors such as part design, tooling lead time, and production quantities largely determine which method is most suitable. The two main types of overmolding are insert overmolding and two-shot overmolding. Using overmolding to create these features consolidates the number of individual parts and eliminates assembly and secondary operations in order to produce a seamlessly integrated product. Seals: An rubber-like overmold can create air and water tight seals.Grips: Rubber-like grips are commonly used in items like power-tools and kitchen utensils. ![]() Aesthetics: Using two materials allows for different colors and textures, and can create striking color contrasts.Here are the main reasons to overmold hard plastic with a rubber-like material: This article will focus on the second application, and we’ll discuss the considerations and guidelines you need to know to ensure success for your next overmolding project. Combining a harder plastic with a rubber-like material.Combining threaded metal inserts with a plastic part.The two most common applications for overmolding are: Typically, the first material (the substrate) is covered partially or fully by a second material (the overmold). Overmolding in injection molding is a process that combines multiple materials together to form one single part.
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