Polymer Injection Moulding Test Services - polymer injection molding
Author:gly Date: 2024-10-15
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Two-shot injection molding generally becomes more cost-effective at higher volumes due to its ability to produce complex multi-material parts in a single cycle, reducing labor and operational costs. However, the initial investment in setup and tooling is significant. Overmolding, while potentially higher in per-part cost due to longer cycle times and additional labor, requires less upfront investment and can be more cost-effective for smaller production runs.
Though the five types of biodegradable plastic resins discussed above have a firm hold on the biodegradable plastics market, there is another emerging source of biodegradable plastic: Hemp.
As we compare overmolding to two-shot injection molding, understanding their specific applications and the subtleties of each process will be crucial in determining the best approach for any given manufacturing requirement.
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Overmolding offers more design flexibility due to its ability to combine a wide range of materials that do not necessarily have to be closely compatible. It allows for the addition of different textures, colors, and properties with fewer constraints on the molding environment. Two-shot injection molding is precise and efficient for producing complex, multi-material parts. However, material compatibility and design precision are required for the positioning and bonding of materials.
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If you are considering using a eco-friendly resin to create your plastic injection molded part or product, you’ve got a number of options at your disposal. Which resin or composite resin will make the most sense for you will depend on a number of factors, including the properties you desire in the end product. Though popular among consumers, it is important to bear in mind that biodegradable plastic resins may not be an appropriate choice for all projects.
Deciding between two-shot injection molding and overmolding depends on several factors, including the project’s scale, budget, material requirements, and final product application.
Two-shot injection molding typically has shorter cycle times because it completes the part in one continuous, automated cycle. Overmolding requires multiple cycles (one for each material layer), potentially increasing total production time, especially if manual labor is involved in transferring substrates between molds.
This quality makes biodegradable plastic especially well-suited for items and products which will be discarded after one use. The most common types of biodegradable plastic resins used in plastic injection molding include:
The use of biodegradable plastics is soaring across industries, as consumers continue to demand more eco-conscious products in the wake of the green movement. In fact, according to recent research from Market Research Futures, the biodegradable plastics market will reach $27.3 billion by 2027—an impressive compound annual growth rate (CAGR) of 18.9 percent from 2022 levels—spurred largely by consumer demand.
Below, we explore the top five biodegradable plastics that you may be able to use for your plastic injection molding projects, as well as one emerging material that may be poised for strong growth.
Overmolding is used in a wide range of industries due to its ability to add enhanced properties to a part, such as improved grip, aesthetics, and durability. Typical applications include:
Hemp currently accounts for more than 500,000 tons per year in the European Union alone, with extremely high projected growth rates.
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Two-shot injection molding is a preferred choice for many high-end applications in these sectors because it can mold parts that meet strict technical specifications while also addressing the need for visually appealing designs.
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Overmolding is a versatile manufacturing technique where a single part is created through the sequential injection of two or more materials onto a base part or substrate. The primary material, usually a rigid plastic, forms the substrate, while the secondary material, often a softer plastic or rubber, is molded over the first. This process not only enhances the product’s functionality but also improves its aesthetic appeal and tactile experience.
In both two-shot injection molding and overmolding, thermoplastics are commonly used due to their versatility and ease of molding. For two-shot injection molding, materials like ABS (Acrylonitrile Butadiene Styrene), polycarbonate, TPE (Thermoplastic Elastomers), and TPU (Thermoplastic Polyurethane) are popular. These materials are chosen for their ability to bond well during the molding process and withstand the rigors of repeated use.
Choosing the right injection molding materials is crucial for the success of both processes. For two-shot injection molding, materials must be carefully selected to ensure they can bond well and withstand the molding temperatures and pressures without degrading. Typically, materials with similar melting temperatures and chemical properties are chosen.
Whether your customers and clients are demanding a switch to biodegradable plastics or your consideration is being driven by a personal desire to use eco-friendly resins, it pays to understand what options you have when it comes to biodegradable resins that can be used in plastic injection molding.
In contrast, overmolding offers more flexibility with material selection since the secondary material only needs to adhere mechanically to the substrate or use adhesives or primers for chemical bonding. This allows the use of materials with different properties, such as a rigid plastic base with a soft silicone or rubber overlay.It’s not uncommon to need support when reviewing and selecting the right material for your project needs. When requesting an injection molding quote, Fictiv’s global team of manufacturing engineers can provide valuable guidance to ensure your manufacturing success. We also created Materials.AI, a first-of-its-kind AI assistant, to help you navigate the complex landscape of materials choices.
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Ashwin Kasirajan is a Fictiv Manufacturing Engineer who works with customers on their injection molding programs. To understand the importance of tool design in two-shot injection molding, he explains, “The tool must allow both stages of the part to be molded in the same tool in order to achieve maximum production efficiency. The design must consider two separate injection stages that can be rotated 180 degrees or oriented to allow a robot to transfer the components. Each injection station is run by an independent injection unit, which allows injection speeds and pressures to be controlled for each material being utilized.”
PBS (polybutylene succinate) is an aliphatic polyester with properties similar to polypropylene, but which naturally degrades into water and CO2. It is made from succinic acid, a naturally occurring chemical common to most living organisms. PBS is used in packaging for food and cosmetics, medical implants, and drug encapsulation. PBS is often mixed with PLA to change strength or impact resistance of a part or product, without unduly affecting thermal or tensile properties.
Polylactic acids (PLA) are derived from tapioca, cassava, sugarcane, or cornstarch. PLAs are used to manufacture a number of different kinds of goods, including medical implants—such as rods or screws—and also in consumer products—such as cups, food packaging, disposable tableware, and loose-fill packaging.
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Overmolding frequently uses similar base materials, such as ABS and polycarbonate, but often pairs them with softer, more flexible materials like silicone or soft PVC. These combinations provide enhanced grip, aesthetic qualities, or additional functionality, such as shock absorption or water resistance.
“However,” he advises, “depending on the part’s structure, some features can only be accomplished by double-shot injection molding, while others can only be completed by overmolding.”
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Both two-shot injection molding and overmolding are employed to create multi-material components, enhancing functionality, aesthetic appeal, and product performance. However, they diverge significantly in their methods, applications, and ideal production scenarios.
Cost and Volume Efficiency: Two-shot molding is generally more cost-effective at high volumes due to its efficiency and speed, while overmolding can be more suitable for lower volumes or prototypes due to its simpler setup and lower initial costs.
Hemp plastic is used extensively in the automotive industry for panels, and in the building industry for a variety of products where fire-retardant properties are desirable. Hemp plastic water bottles eliminate the concerns associated with BPA plastics and are completely biodegradable.
As a note: It is important that this material is thoroughly dried prior to being processed via plastic injection molding.
Two-shot injection molding is particularly valuable in industries where part durability, aesthetic qualities, and production efficiency are paramount. Common applications include:
The process of two-shot injection molding is executed in a specialized molding machine that is equipped with two or more injection units. The core of the process lies in the precise control of the injection units and the mold design, which needs to accommodate multiple injections. Here’s how it typically unfolds:
Kasirajan puts it simply, “Choose overmolding if the quantity is not too high—only a few thousand or ten thousand—to save some money on molds. If your program requires quantities of 500,000 or more, the more cost-effective process is two-shot injection molding.”
Throughout production, the accuracy of the molds is checked using a coordinate measurement machine (CMM, a three-dimensional measurement device) to prevent injection molding flaws that can occur from misalignment, such as flash.
Polycaprolactone, or PCL, is used in the production of polyurethanes to improve impact resistance or to add resistance to water, solvents, oils, and chemicals. It is made from vegetable oils and often mixed with starch-based plastics to reduce costs or to change the tensile characteristics of the material. Typical medical uses include drug delivery devices, sutures, or adhesion barriers and scaffolding to help in tissue repair.
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Biodegradable plastic is any of a number of plastic varieties that can decompose naturally in the environment, compared to traditional plastics which do not decompose as readily. Most biodegradable plastics are created by the fermentation of canola oil or sugar, and they decompose under the right temperature and humidity conditions.
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Two-shot injection molding often results in a higher consistency and stronger bond between materials, as the process is fully automated and materials are chosen for their chemical compatibility. This can lead to improved structural integrity and performance. Overmolding, while providing good quality and functional enhancements, may face challenges with material bonding if not properly designed, potentially affecting durability.
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Starch-based thermoplastics (TPS) are cheap and abundantly available. They are often combined with other materials for use in plastic injection molding. They can be used for food packaging, carryout packages for fast food, and disposable utensils. Starch-based plastics are completely biodegradable and may end up being completely carbon neutral, an important consideration given the increased awareness that average consumer have regarding carbon emissions and global warming.
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Two-shot injection molding, also known as dual injection, multi-shot, or 2K molding, is a highly specialized process that combines two different materials or colors into a single injection molded part. This advanced molding technique involves injecting two types of polymers into the same mold through separate injections but within the same molding cycle. The result is a complex part that can have varying colors, textures, or material properties, seamlessly integrated without the need for post-molding assembly.
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PHA (polyhydroxyalkanoates) is a plastic resin created by the action of bacteria on sugars or lipids. By combining various molecules, the resulting plastic resin takes on a variety of properties. PHAs are stable under exposure to UV, highly moisture resistant and do not easily absorb odors, making them ideal for food and cosmetics packaging, as well as certain medical devices, such as surgical mesh or sutures.
The entire process is highly automated and controlled, requiring less labor and minimizing the risk of human error, which is crucial for the high-volume production of complex parts.
In the world of injection molding services, manufacturers and designers have several techniques at their disposal to create high-quality, functional, and aesthetically pleasing plastic parts. Among the most advanced and versatile techniques are two-shot injection molding and overmolding. Both techniques offer unique advantages and are suited for different applications, yet they are often confused or misunderstood. By understanding the intricacies of each method, professionals can optimize their manufacturing processes and leverage the strengths of each technique for their specific project needs.
Kasirajan also points out the importance of precision throughout the process, “Because the mold shifts or rotates along the axis, the interchangeability of the core and cavity at both sides must be ensured.”
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By thoroughly assessing the requirements of your specific application and considering the pros and cons of each method, the injection molding experts at Fictiv can help you select the most appropriate injection molding process to achieve your manufacturing goals.
Hemp plastics may be made from 100 percent hemp and infused with hemp fibers for strength and durability, or they may be mixed with other plastics. Hemp plastics can be up to five times stiffer and 2.5 times stronger than polypropylene, and it can be used in standard plastic injection molding machines without requiring any machine modifications.
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The versatility of overmolding makes it ideal for customizing parts that require tactile and aesthetic qualities in addition to functional performance. This method is especially beneficial where the production scale or budget constraints do not justify the higher initial costs associated with two-shot injection molding.