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In terms of disadvantages, the tolerances of over-molded parts are often lower than those of two-shot injection molding. It is also important to remember that plastic compatibility requirements may constrain designers.

Low volume plastic injection molding is driven by customers that have a continuous product development cycle or lower product demand.  Midwest Mold works with product developers, OEMs and tier suppliers to supply plastic injection molded parts for demanding specifications, timelines and budgets.

In addition, it is very important that the material of the mold is easy to bond, and the mold must be aligned to prevent deformation of the parts.

At the beginning of the over-molding process, engineers inject the substrate with a harder over-molding material. Then, the substrate is placed in an over-mold tool or an over-mold cavity within the same mold. The molten-over mold material is then sprayed into, onto, or around the substrate. After the molten material is cooled, the substrate and the over-mold are chemically or mechanically combined. The entire over-molding process only takes 30 seconds.

Engineers should know that Two Shot Mold can be accelerated or slowed down, depending on how the substrate is transferred to another cavity of the mold. Hand and robot arm transfer takes longer than the rotating plane, but the rotating platen molding is more expensive, usually, there are only high-efficiency options, mass production runs.

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We encourage prospective customers to bring their next plastic development project to Midwest Mold to experience what our team has to offer firsthand!

Compared with two-shot molding, over-mold design is also easier, because engineers can use any standard injection molding machine to carry out this process.

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Two Shot Injection Molds, also known as dual-molds, double-shot molds, or multi-shot molds, are a subcategory of injection molding that allows engineers to create multi-material or multi-colored parts without adding additional assembly steps.

Overmolding, like Two Shot Moulding, is a multi-shot injection molding process that produces a single final product from two or more different thermoplastics. This process is ideal for engineers who want to build components that are powerful, functional, beautiful, and that will not separate over time.

The product team must remember that all thermoplastics used in the over-molding process must be chemically or thermally compatible with each other. Compatibility with metal substrates is usually not a problem, because they can be used with any plastic over mold, but the product team may encounter compatibility issues when using plastic over molds. If the substrate and mold are not compatible, the final product may be deformed or poorly bound.

If you have the “cant wait” mentality and are looking for physical examples of your plastic part ASAP, consider Midwest Mold for your rapid prototyping and prototype injection mold partner. We have 3D printing capabilities and can create and ship your product quickly and easily. Confused about what’s the best process for you? Take a look at our case study that compares 3D Printing vs. Low Volume Production to see which one suits your project best.

Our ideal customer for low volume molding places a high value on supplier relationships, understands price is one element of total cost and utilizes Midwest Mold as their preferred partner in plastic product development to solve problems, propose solutions and share best practices in tool design and optimized processing for shot to shot repeatability.

This process is ideal for someone who’s looking for prototypes and low volume manufacturing runs for their plastic parts. One might ask, what’s so special about aluminum injection molding and how can I utilize it for my injection molding needs?

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Many different processes belong to the category of injection molding, including over-molding and two-shot molding. The two processes are similar, but there are some key differences-here are what engineers and designers need to know:

Two-shot injection molding is efficient and economical manufacturing technology. This process also produces highly durable terminal parts and assemblies.

Midwest Mold isn’t like other Prototype/Low Volume facilities. We have the experience and equipment to provide unparalleled speed, flexibility and support. We use our exceptional molding expertise to provide comprehensive technical guidance and tooling options for your project. We don’t just send a price estimate for a new project; we send an informed quote after learning about your needs. We pride ourselves on working closely with you from the start, making sure job specifications align with your project goals.

We’re also proud of our speed, providing short turnaround on injection molding services without sacrificing quality or precision. We’re constantly refining our production process, implementing new ways to reduce inefficiencies and shorten lead times for our customers. Whether you’re looking for short run production, rapid tooling or prototyping services we can help you find the best solution and deliver it quickly and efficiently.

Low volume molding projects typically require less than 10,000 pieces per year and Midwest Mold has 100 ton, 165 ton and 330 ton plastic injection molding machines in-house and the ability to go larger as needed.

Overmolding and two-shot injection molding have many of the same advantages. They are ideal for quickly creating durable, reliable, and vibration-resistant parts with complex geometries, but over-molding is best suited for low-volume production runs.

From a design point of view, two-shot molding provides designers with a lot of flexibility, because this process can create complex geometric shapes and adapt to multiple colors to produce more beautiful parts.

In addition, because one machine manufactures the entire part, no post-processing is required, and engineers can greatly reduce manufacturing time, thereby reducing costs. However, it is worth noting that the initial two-shot injection molding machine may be costly, and the two-shot injection molding machine is more expensive than the standard injection molding machine. Fortunately, these costs are usually offset by labor savings and assembly costs for large-scale production runs.

However, if two less compatible plastics must be used, the team can design mechanical bonding properties for the part after the fact, although this may result in higher costs.

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Your Name: Your Email: Resin: Estimated Life of Program: Estimated Annual Volume: Estimated Order Quantities (if Low Volume Molding Project): Target Price (Tooling/Piece Part): Message Attach a File ❌ ❌

Injection molding is a popular manufacturing process, which can quickly produce complex-shaped precise parts without wasting a lot of materials.

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From there, the mold opens and rotates 180° with one side of the substrate to meet the other mold chamber and injection molding nozzle. Once the substrate is in place, the second material is injected and combined with the substrate to form a firm hold. Once the second layer has cooled, the last part will be sprayed out.

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While many injection molding companies are starting to put much more emphasis on aluminum injection molds and tooling for its advantages over steel, Midwest Mold has been specializing in it for decades.

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Through the different layers of materials or colors created by the injection molding machine, the two-shot injection molding process is best understood. The first material is injected into the mold to create the substrate, and other materials or materials will be molded around the substrate. After the substrate solidifies and cools, it is transferred by hand, robotic arm, or rotating plane to another cavity of the mold.