Two-shot plastic injection molding is an injection molding process used to create multilayer, multicolor, or multi-material parts in a single process. This process is also sometimes referred to as two shot injection molding, 2-shot molding, 2K, multilayer, multi-shot injection molding, or multishot molding. Multi-shot manufactured products eliminate steps in the manufacturing process while creating a more cost-effective, enhanced finished product.

Also called multi-shot or double-injection molding, two-shot injection molding is an over-molding process that adheres additional material—like thermoplastic elastomer (TPE)—to plastic substrates to improve the appearance, grip, handling, environmental resistance, or impact resistance of injection molded components. Two-shot injection molding is typically performed by multi-barrel injection molding machines, which add extra material shortly after forming the substrate to create strong bonds between the materials.

Compare the tooling costs and lead times associated with each method. Low volume injection molding typically requires the fabrication of aluminum molds, which offer cost savings and shorter lead times compared to steel molds used in traditional injection molding. Thermoforming molds are also cost-effective and can be fabricated more swiftly due to their single-sided design and lightweight materials.

The two-shot injection molding process consists of two main phases. Similar to traditional injection molding, the first phase involves injecting resin into a mold, which is then cooled to form a solid part in the shape of the mold. The second phase involves overmolding the 1st shot by transferring it to a second cavity by robot or rotating platen. The two plastic resins will form a molecular bond and, once cooled and ejected, becomes a finished multi-resin molded part.

At Fabrik Molded Plastics, Inc., we offer custom two-shot plastic injection molding capabilities. Other service offerings include precision plastic injection molding, insert molding, CT scanning, scientific plastic injection molding, automotive lighting, tooling transfers, and custom automation services.

Whether you need 1,000 or 100,000 custom plastic components, the thermoforming experts at Advanced Plastiform Inc. will work with you to determine the best method of manufacturing to provide you with the durable, high-quality plastics you need. This includes prioritizing a low per-unit price with as quick a lead time as possible.

The low volume injection molding process begins with the creation of a custom-designed injection mold. The mold is then mounted onto an injection molding machine, where thermoplastic pellets are fed into a heated barrel within the machine, where they are melted to a liquid state. The molten plastic is then injected under high pressure into the mold cavity, conforming to its shape and intricacies.

Traditional plastic injection molding is renowned for its high-volume manufacture but entails significant upfront costs, primarily due to tooling expenses. Injection molds, usually crafted from steel or copper alloy, endure the intense pressures of the injection process, necessitating intricate and heavyweight designs, thereby escalating fabrication costs and lead times.

Navigating the realm of manufacturing processes can be a daunting task, especially when considering options like low volume injection molding or thermoforming. At Advanced Plastiform Inc., we understand the critical importance of choosing the right method for your project.

Since 1988, Advanced Plastiform, Inc., has been providing superior custom plastic molding and fabrication services to companies in North Carolina, South Carolina, Maryland, Georgia and Pennsylvania. Contact us to make an appointment Mon-Fri 8-5.

Get started today by receiving a free quote tailored to your project for plastic parts and products. Contact us now by calling us at  919-404-2080 or filling out the online contact form. Don't delay—unlock the potential of custom plastics manufacturing with us today.

Twin sheet forming is an advanced technique where two plastic sheets are heated simultaneously and formed together to create a hollow, double-walled structure, offering enhanced strength, insulation, and structural integrity for applications such as automotive components, farming equipment, outdoor furniture, and more.

Fabrik Molded Plastics, Inc. is a custom injection and insert molding provider of thermoplastic products. We use the latest molding technologies and automation equipment in our full-service offerings to ensure we compete at the global level. Because we use the latest molding technologies and a  scientific approach in our molding processes, our clients can reap the benefits of our competitive advantage. Contact us today or request a free quote to start your custom project.

Thermoforming boasts several advantages that make it an attractive plastic manufacturing method for low- to mid-volume production:

This approach not only reduces initial investment but also enhances the overall flexibility and scalability of the thermoforming process, making it well-suited for low to mid-volume production runs.

Low volume injection molding offers several distinct advantages that make it a preferred choice for small to medium-sized production runs:

After cooling, the mold opens, and the newly formed plastic part is ejected. Depending on the complexity of the part and the requirements of the project, secondary operations such as trimming, machining, or assembly may be performed to achieve the final desired product.

Take into account the size and weight of the parts you need to produce. Thermoforming is well-suited for forming large parts with minimal material thinning, making it ideal for applications requiring lightweight yet durable components. Low volume injection molding can also accommodate a range of part sizes but may be more suitable for smaller, more intricate parts.

With a commitment to precision, efficiency, and cost-effectiveness, our injection molding company specializes in providing comprehensive solutions tailored to your unique plastic part needs. Whether you're aiming for intricate details with low volume injection molding or seeking the versatility of thermoforming, our expertise ensures that you can make informed decisions to propel your project forward with confidence.

We proudly serve the Mid-Atlantic and Southeast, including North Carolina, South Carolina,  Pennsylvania, Maryland, Tennessee, Georgia, and Virginia.

Evaluate the complexity of the parts you need to manufacture. Low volume injection molding excels in producing parts with intricate details, tight tolerances, and complex geometries, making it suitable for applications requiring high precision. Thermoforming is better suited for larger parts with simpler geometries, although pressure forming techniques can achieve finer details compared to traditional vacuum forming.

In contrast, low volume injection molding often employs aluminum molds, operating at lower pressures to safeguard against mold damage. This strategic choice significantly reduces tooling costs by 5 to 25 percent, with aluminum's malleability facilitating quicker mold creation, thereby expediting the overall injection molding process timeline.

Thermoforming is a versatile manufacturing process involving the heating of large plastic sheets until pliable, which are then shaped around a custom-fabricated aluminum tool.

Choosing between low volume injection molding or thermoforming methods requires careful consideration of various factors to ensure the optimal manufacturing solution for your specific project requirements.

Advanced Plastiform offers guidance on the optimal manufacturing process to maximize efficiency and cost-effectiveness for low run, plastic parts.

Commonly used materials for two-shot injection molding include thermoplastics, thermoplastic elastomers, and liquid silicone rubber.

Consider the anticipated production volume for your project. Low volume injection molding is typically suited for production runs of fewer than 10,000 pieces, making it ideal for smaller quantities. Thermoforming, on the other hand, offers flexibility for both low to mid-volume production runs, with the ability to scale up or down as needed.

Consider your project timeline and production speed requirements. Thermoforming typically offers faster lead times and shorter production cycles compared to low volume injection molding, making it a preferred choice for rapid prototyping and quick-turn projects. However, if precision and tight tolerances are critical, low volume injection molding may be the better option despite longer lead times.

Low volume injection molding finds application across a wide range of industries where precision, flexibility, and cost-effectiveness are paramount. Some of the key industries utilizing low volume injection molding include medical, telecommunications, consumer packaging, and more.

The two-shot molding process improves the final product in terms of feel, color, and functionality. There are many design opportunities to suit specific preferences. Examples of two-shot injection molded products include toothbrush handles, buttons, switches, caps and closures, and hand and power tools.

Consider the material requirements for your parts. Both low volume injection molding and thermoforming offer versatility in material selection, with a wide range of thermoplastic resins available. Evaluate factors such as material properties, performance requirements, and cost to determine the most suitable material for your application.

For bonding to occur, the two parts undergoing the two-shot molding process must be chemically compatible. Fabrik consults with customers and material suppliers to ensure proper material selection for the specific application.

Thermoforming often utilizes lightweight aluminum molds, minimizing both tooling costs and lead times. Thermoforming molds are typically single-sided and can be fabricated more swiftly due to the material's malleability, making it an efficient and cost-effective alternative to traditional injection molding.

Vacuum forming involves suctioning out the air between the plastic sheet and the tool to ensure a snug fit, ideal for larger pieces with less intricate details. Conversely, pressure forming utilizes highly pressurized air to blast the plastic sheet while simultaneously applying vacuum suction, allowing for sharper angles and finer details, making it a compelling alternative to injection molding.

Low volume injection molding, also known as "short-run manufacturing," serves as the vital bridge between product prototyping and high-volume production, catering to orders typically fewer than 10,000 pieces.