Multi-component injection molding for complex molded parts
Multifunctional 2K and 3K injection-molded parts
Multi-component injection molding combines the best properties of Plastic, elastomer and Metal in a single component. This creates highly functional components that specifically combine mechanical strength, soft sealing zones, transparent elements, or tactile surfaces.
Thanks to proven manufacturing processes, we process multiple components into 2K and 3K molded parts. With our many years of experience in plastic injection molding and the production of technically sophisticated silicone components, we can implement even complex projects with precision. For example, metal elements can be overmolded with plastic and simultaneously provided with an elastomer seal.
This integrated manufacturing technology not only reduces assembly steps and lowers costs, but also significantly increases design freedom and technical precision. The homogeneous bonding of the materials also ensures lasting stability and tightness – even under demanding conditions.
We accompany you through the entire project process – from tool and sample production through to production and optional assembly of the series parts.
References of our molded parts in multi-component injection molding
Here you will find selected reference projects that illustrate the versatility, precision, and efficiency of our multi-component injection molding manufacturing solutions. Our projects demonstrate how different materials can be combined in a single component to achieve maximum functionality and optimal performance. We rely on innovative processes to precisely implement even our customers' complex requirements.
Application examples for multi-component injection molding
Multi-component injection molding allows for the combination of different materials in a single component. Here are some examples from various industries:
Electronic enclosures
Electronic devices benefit from robust housings reinforced by multi-component technology. Integrated seals provide additional protection, while special materials ensure electrical conductivity or shock resistance.
In addition, we also develop and manufacture tailor-made plastic molded parts with integrated magnetic connectors. This involves powerful Spring contact pins and magnets are integrated directly into the housing design – for a compact, reliable and intuitive connection solution.
Handles with cushioning
Ergonomic handles are manufactured for tools, handheld devices or bicycles. While the hard component ensures stability, the soft component offers pleasant cushioning. This improves grip, comfort and vibration absorption.
automotive sealing systems
In the automotive industry, multi-component injection molded parts are used in seals, bearings, steering components and shock absorbers. They offer optimal protection against moisture, dirt and noise. At the same time, they reduce vibrations and increase driving comfort.
Medical equipment
In medical devices, the hard plastic component ensures a stable structure, while the soft silicone component improves skin compatibility. This increases wearing comfort and enables safe use.
Domestic appliances
Multi-component components increase the longevity and safety of household appliances. In coffee machines, for example, special material combinations improve durability and ensure effective insulation.
lightweight constructions
In the aerospace industry, multi-component injection molding helps reduce weight without compromising strength. This creates lightweight but durable components that can withstand high loads.
sports and leisure items
Ergonomic handlebar grips for bicycles, ski and snowboard grips or shock-absorbing sports equipment are just a few examples of multi-component injection molding in the leisure sector.
Electronic components
Multi-component injection molded parts are also used in the electronics industry. For example, they are used for housings of smartphones or tablets in order to achieve a combination of durability and modern design.
Advantages of multi-component injection molding
material combination for optimal properties
Multi-component injection molding allows thermoplastics, elastomers, and metals to be combined in a targeted manner. combination of different Shore hardnesses Flexible yet stable structures can be created. It is also possible to provide metal inserts with a protective layer of TPE to make components vibration-damping. In the electronics industry, the use of conductive plastics contributes to shielding electromagnetic radiation.
A typical example is a 2K housing with an integrated seal, which provides reliable IP68 protection while simplifying installation.
Design diversity and precise geometries
Multi-component injection molding allows the realization of complex shapes that would not be possible with conventional manufacturing methods. Filigree structures with wall thicknesses from 0,5 mm enable precise design, while the seamless connection of different materials ensures greater stability.
Weight reduction for lightweight constructions
Weight reduction plays a crucial role in the automotive and aerospace industries. The use of fiber-reinforced plastics or hybrid components made of aluminum and TPE allows for the production of lighter yet stable components.
The targeted selection of materials enables a weight reduction of up to 30%without compromising mechanical strength. The reduced weight not only improves energy efficiency but also reduces material usage, thereby lowering production costs.
Cost efficiency through functional integration
The ability to combine multiple functions in a single component makes multi-component injection molding particularly cost-effective. While the initial investment in tools and machinery may be higher, the reduced assembly effort results in long-term cost savings.
Fewer assembly steps and a lower scrap rate lead to optimized production with lower material consumption. One example is a rubber-metal damping element that is manufactured using 2K injection molding without separate bonding. Production time is reduced by up to 40%, which enables companies to significantly increase their efficiency.
Improved functionality and durability
The targeted combination of hard and soft materials Components can be optimized for extreme operating conditions. TPU overmolding can protect sensitive metal components from corrosion and abrasion, while vibration-damping elastomers reduce vibrations.
An overmolded metal bolt with a special protective coating is an example of the increased durability of these components. Particularly in the machine and automotive industries, such solutions help to extend the service life of components and minimize maintenance effort.
Wear resistance and longer service life
Components exposed to high mechanical stress benefit from additional protective coatings. The use of abrasion-resistant elastomers or PTFE-coated materials can reduce wear and extend service life.
Housing edges with integrated TPU reinforcements provide improved shock resistance and increase resistance to mechanical impacts. Another example is a grip system for tools that combines a hard plastic base with a non-slip rubber overmold.
Efficient manufacturing with shorter production times
A major advantage of multi-component injection molding is the shortened production timeThe ability to combine different materials in a single injection molding process reduces assembly effort and saves valuable production time. At the same time, optimized process control minimizes waste and ensures consistently high quality.
A 3K connector housing, manufactured in a single manufacturing step, combines the hard housing, the flexible seal and the conductive shield. This technology not only improves product quality but also significantly reduces manufacturing costs.
Sustainability
In addition to economic and functional advantages, multi-component injection molding also offers ecological benefits. The targeted combination of materials reduces raw material consumption and minimizes material wasteThe use of lighter components also reduces energy consumption in vehicles and machines.
technology in multi-component injection molding
Insert technology – overmolded metal inserts
Insert technology enables the form-fitting and force-fitting integration of metallic inserts into injection-molded plastic components. Elements such as Threaded inserts, contact pins or fastening elements specifically inserted into the tool and precisely in the injection process overmolded with the carrier materialThe result is a highly stable hybrid solution that combines mechanical strength with the functional properties of the plastic – without any downstream assembly steps.
Outsert technique – plastic on metal
Outsert technology is a special process in which plastic structures are applied directly to prefabricated metal supports. The metal component is first inserted into the mold, followed by targeted overmolding with thermoplastic material. This creates a high-strength bond that combines the mechanical stability of metal with the functionality and design freedom of plastic.
In contrast to the insert technique the metal content predominates in outsert components – ideal for designs where structural strength and precise dimensional accuracy are paramount. This method has proven particularly effective in areas with high demands on robustness and precision – such as the automotive sector, mechanical engineering, or medical technology.
Metal components in elastomer composites – flexibility and damping
In addition to the combination of plastic and metal, we also offer the integration of machined metal components with elastomers Here, a milled Metal component bonded to elastomerThis technology enables highly functional solutions for applications with special requirements for damping, flexibility and durability.
Elastomer materials such as silicone, EPDM or NBR offer excellent damping properties and high chemical resistance. By combining different color and hardness variations, components can be tailored precisely to customer-specific requirements. This creates high-precision components that are used, for example, as shock absorbers in the automotive industry, sealing elements in mechanical engineering or transport rollers in industrial plants.
Thermoplastics – Perfect material combinations for optimal results
The multi-component injection molding offers a variety of possibilities to create functional and visually appealing products. This process allows combine hard and soft plastics in one component or produce multi-colored products efficiently. To ensure that the desired material properties are achieved, the correct selection of materials is crucial.
We've compiled a material overview that shows which combinations combine particularly well and which are less suitable. This overview helps developers and designers select the optimal material pairing for their individual requirements. The right material combination contributes significantly to the quality, durability, and performance of the final product.
You can also find this table in our Design Guide Plastic Molded Parts >>
Design Guide Plastic Molded Parts & Free Sample Card
Our Design Guide for Plastic Molded Parts and the free sample card with plastic EDM structures are aimed specifically at developers, designers and buyers who are intensively involved in the development and production of plastic molded parts.
The guide provides a comprehensive and detailed overview of engineering plastics and their diverse practical applications. It also focuses on important topics such as material selection and design. This guide will help you manage your projects more efficiently and achieve better results.
Our N&H plastic sample card made of ABS plastic shows 12 different SPI surface treatments, ranging from polished to rough textures. In addition, the sample card contains the 12 most common VDI 3400 surface texturesthat can support you in the planning and implementation of your plastic molded parts.
Thanks to this comprehensive overview, you can more easily select the right surfaces for your projects. At the same time, you can optimize the quality of your plastic parts in a targeted manner. The sample card is a valuable tool that will accompany you during every phase of your planning and help you make precise decisions.
Comprehensive service in multi-component injection molding
In the area of multi-component injection molding, we offer you a comprehensive service package – flexible and modular. You decide whether you want to use individual development services or let us support you throughout the entire product development process – from concept development and tool design to series production.
Our experienced product designers develop precise component solutions according to your specifications – whether as a single component or as a complex hybrid component. Optimizing existing designs with regard to function, manufacturability, and cost is also part of our portfolio.
Our range of services at a glance:
- Design and development of 2K/3K components
- Feasibility analyses for multi-component parts including material recommendations
- Development of technical alternatives for cost and process optimization
- Mould flow analyses to ensure tool and component geometry
- Prototype construction via 3D printing (also multi-material models)
- Creation of detailed DFM (Design for Manufacturing) reports
- Tool design and construction based on your or our designs
This is how we start your project
In order to make you an initial offer, we need the following information:
- A technical drawing, sketch or sample of your product
- Technical Specifications
- Information on desired equipment extras
- required quantity or your annual requirement
To protect your data and ideas, we can conclude a non-disclosure agreement (NDA) in advance. If you do not have your own NDA, we will be happy to provide you with our template.
NDA templateContact Please contact us by email info@nh-technology.de oder telefonisch +49 (0)2154-81250. We look forward to your inquiry.
Personal Meeting
A personal meeting is very important to us when getting to know each other and discussing complex or new projects. This way we can ensure that we fully understand your requirements and needs.
In our showroom you can see for yourself the quality and functionality of our products. Get individual advice and try out the different models. Our team of experts is ready to answer all your questions. Together with you we will find the optimal solution for your requirements.
Of course, you can also arrange an online meeting.
Contact Simply contact us to arrange an appointment and get to know us. We look forward to discussing your requirements with you and finding the optimal solution for your project.