Plastic Injection Molding & Comprehensive Manufacturing Solutions in Duluth, MN
Ronningen is proud to provide high-quality plastic injection molding and manufacturing services to businesses in Duluth, Minnesota. With over 50 years of experience, we specialize in delivering precision-molded plastic parts for industries such as medical devices, aerospace, automotive, and consumer electronics. Our advanced manufacturing facility is equipped with the latest injection molding technology, allowing us to efficiently handle everything from small prototype runs to high-volume production.
In addition to plastic injection molding, we offer a full suite of secondary services, including over molding, insert molding, ultrasonic welding, and electroplating. These services help streamline production, reduce lead times, and ensure that each part meets your functional, aesthetic, and performance requirements. Ronningen is committed to providing reliable, cost-effective manufacturing solutions that help businesses in Duluth stay competitive in their industries.
Comprehensive Plastic Manufacturing Solutions for Duluth Industries
At Ronningen, we offer a comprehensive range of plastic manufacturing services designed to meet the unique needs of businesses in Duluth. Our services include plastic injection molding, over molding, insert molding, and structural foam molding, providing durable, high-performance parts that meet your specifications. Whether you’re producing small quantities for prototyping or high volumes for mass production, we ensure that every part is produced with precision and care.
We also provide a range of secondary operations such as machining, leak testing, electroplating, pad printing, and custom packaging. By offering all of these services in-house, we streamline production and reduce lead times, ensuring your parts are delivered with the highest quality and efficiency. Ronningen is your trusted partner for high-quality plastic manufacturing solutions in Duluth.
Precision Injection Molding and Manufacturing Excellence for Duluth, MN
Ronningen is dedicated to providing precision plastic injection molding services to businesses in Duluth, MN. Our high-tonnage injection molding machines and cutting-edge technology enable us to produce parts with tight tolerances and complex geometries. We also offer specialized services such as ultrasonic welding, spin welding, and structural foam molding, ensuring that each part is both durable and lightweight, meeting your design and performance requirements.
In addition to injection molding, we provide in-house machining, milling, custom cutting, and leak testing services to ensure your parts meet the highest standards of accuracy and quality. Our comprehensive approach helps streamline your production process, saving you time and reducing costs while ensuring the reliability and functionality of your parts.
Why Duluth, MN Manufacturers Choose Ronningen
Ronningen is the trusted partner for manufacturers in Duluth, MN because we offer a full range of services that simplify the production process and meet the unique needs of local industries. We provide precision plastic injection molding, over molding, insert molding, and structural foam molding, allowing us to produce parts that meet the most demanding specifications. Our in-house capabilities also include machining, electroplating, leak testing, and custom packaging, all of which help streamline your production and reduce lead times.
By offering all of these services under one roof, we reduce complexity and eliminate the need for multiple suppliers. Ronningen’s experienced team ensures that every part is produced with the highest quality, and we’re committed to helping you bring your product to market faster and more cost-effectively.
Fast and Efficient Plastic Injection Molding Solutions for Duluth, MN
Ronningen’s facility in Duluth is designed to provide fast, reliable, and cost-effective plastic injection molding services to local businesses. Whether you need quick-turn prototypes or large-scale production runs, we have the capacity and expertise to handle it all. Our high-tonnage machines and advanced molding technology allow us to produce parts with precision and efficiency, meeting tight deadlines without sacrificing quality.
We also offer secondary services such as machining, leak testing, part marking, and packaging, which are all performed in-house to streamline your production process. By offering these services under one roof, we reduce the complexity of your supply chain and ensure that your parts are delivered on time, meeting your exact specifications. Ronningen is committed to helping businesses in Duluth get high-quality products to market faster.
Our Certifications




Our ISO 9001 certified quality management system is registered and certified by NSF International Strategic Registrations and based on a number of quality management principles including:
- A strong customer focus
- Support of top management
- Adherence to a process approach
- Continual improvement
Under the scope of our registration are the following services:
- Prototype plastic injection tooling for molded parts
- Engineering evaluation samples
- Pilot and production plastic components
Our accreditation from NSF provides assurance to our customers that our certified components and products comply with the technical requirements of ISO 9001.
QMMY2.E116158 Fabricated Parts – Component
Underwriters Laboratories is an independent product safety testing and certification organization working for public safety since 1894. Since its founding, U/L has held the reputation as the undisputed leader in product safety and certification, giving consumers peace of mind about the products they use.
("ITAR," 22 CFR 120-130) REGISTERED
All manufacturers of defense articles, related data, and defense services as defined on the United States Munitions List (Part 121 of ITAR) are required to register with the Directorate of Defense Trade Controls (DDTC). ITAR registration is a means to provide the U.S. Government with necessary information on who is involved in certain manufacturing, brokering, and exporting activities.
(MBP3)
Commitment to our air, land, and water quality is paramount at Ronningen. Since 1999, we've served as a Michigan Business Pollution Protection Partner, adopting pollution prevention policies, committing to reductions, and sharing our successes with other MBP3 members.
Our Comprehensive Manufacturing Services: Plastic Injection Molding & More
Assembly & Sub-Assembly
At Ronningen Research and Development, we provide expert Assembly & Sub-Assembly services for seamless integration of components. Whether it's simple assemblies or complex multi-part solutions, we ensure precision and efficiency in every process.
Custom Coloration
Our Custom Coloration services offer tailored color options to meet your design and branding needs. We use advanced Plastic Injection Molding techniques to ensure long-lasting, consistent colors for your products.
Custom Cutting Parts
Ronningen Research and Development specializes in Custom Cutting Parts using state-of-the-art machinery. We provide accurate cuts for a variety of materials, meeting the specific needs of your project.
Drilling
We offer high-precision Drilling services to create exact holes in various materials. Our advanced equipment ensures accuracy and quality for projects requiring tight tolerances and consistent results.
Electroplating
Our Electroplating services enhance part durability and corrosion resistance with high-quality metallic coatings. We provide superior finishes for applications in automotive, electronics, and more.
Heat Staking
Heat Staking at Ronningen Research and Development creates strong, reliable bonds between plastic components without the need for additional materials. This process is ideal for parts requiring secure assembly and durability.
Hot Stamping
Hot Stamping services provide a high-quality finish with precision and efficiency. We use advanced techniques to apply logos, designs, and text to parts, ensuring a clean and lasting imprint.
Insert Molding
Insert Molding allows us to mold plastic around metal or other materials to create strong, integrated components. This service provides enhanced functionality and durability for complex applications.
Labeling
We provide precise Labeling services that ensure clear, durable markings for traceability, branding, and compliance. Our labeling process guarantees that your parts are correctly identified and meet industry standards.
Leak Testing
Our Leak Testing services verify the integrity of your products, ensuring they meet safety standards. We provide airtight and watertight testing to prevent failures and guarantee quality.
Machining
We offer high-precision Machining services for custom parts. Using advanced CNC equipment, we deliver consistent, high-performance components for a variety of industries.
Milling
Our Milling services create intricate parts with high accuracy. We use advanced equipment to ensure precise cuts and finishes for your custom projects.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Over Molding
Over Molding at Ronningen Research and Development creates multi-material components for enhanced durability and functionality. We mold plastic over existing parts to meet complex design requirements.
Packaging, Custom
Our Custom Packaging services protect your products during transportation and storage. We offer tailored solutions to ensure your parts arrive safely and in excellent condition.
Pad Printing
We provide Pad Printing services for high-quality markings on various materials. Ideal for branding, labeling, and customization, our process ensures precise, durable prints.
Part Marking
Our Part Marking services at Ronningen Research and Development ensure clear and accurate markings for identification and traceability. We use advanced techniques to apply markings that meet industry standards.
Painting
At Ronningen Research and Development, our Painting services enhance the aesthetic and protective qualities of your parts. We apply durable coatings for both functional and cosmetic purposes.
Silk-screening
We offer Silk-screening services at Ronningen Research and Development for durable, high-quality prints on parts. This process is ideal for logos, designs, and labels, providing precise results for a variety of materials.
Shielding
Our Shielding services at Ronningen Research and Development protect components from electromagnetic interference. We use advanced materials and techniques to ensure reliable performance and compliance with industry standards.
Shipping
At Ronningen Research and Development, we handle Shipping with care, ensuring that your products are securely packaged and delivered on time. Our reliable shipping services help you get your products to the market quickly and safely.
Spin Welding
Spin Welding services at Ronningen Research and Development provide strong, durable bonds for plastic parts. This technique is ideal for creating seamless joints without the need for additional materials.
Structural Foam Molding
We offer Structural Foam Molding at Ronningen Research and Development for lightweight, durable plastic parts. This service provides strong components with a reduced weight, ideal for applications that require high strength without the added bulk.
Taping
Our Taping services at Ronningen Research and Development are designed to provide secure adhesion and protection for your products. We offer custom taping solutions to meet the needs of various industries.
Trimming
At Ronningen Research and Development, we provide Trimming services to finish and refine your parts. Our precise trimming process ensures clean edges and perfect finishes for your molded components.
Ultrasonic Welding
Ultrasonic Welding at Ronningen Research and Development uses high-frequency sound waves to create strong, precise bonds between plastic parts. Ideal for delicate applications, this process ensures high-quality, durable results without the need for adhesives.
Frequently Asked Questions About Plastic Injection Molding in Duluth, MN
At Ronningen, we frequently receive questions from businesses in Duluth, MN, about our plastic injection molding services. To help you make an informed decision, we’ve provided answers to some of the most commonly asked questions. Whether you’re new to injection molding or looking to scale up production, our team is here to provide all the information you need.
Q1: What plastic injection molding services does Ronningen offer in Duluth?
Ronningen offers a comprehensive range of plastic injection molding services, including traditional injection molding, over molding, insert molding, and structural foam molding. We also provide secondary services like machining, electroplating, leak testing, pad printing, and custom packaging, all completed in-house. This approach reduces lead times and ensures that your parts are produced to the highest standards.
Q2: Can Ronningen handle both small prototypes and high-volume production?
Yes, Ronningen is equipped to handle both small-batch prototypes and high-volume production runs. Our equipment and systems allow us to scale production to meet your needs, whether you require a few hundred parts or millions. We maintain precision and quality throughout all production volumes, ensuring that each part meets your exact specifications.
Q3: How does Ronningen ensure the quality of molded parts?
Ronningen follows ISO 9001:2015 quality standards and uses advanced inspection tools such as CMMs, vision cameras, and leak testers to ensure that each part is produced to your exact specifications. Our team conducts rigorous quality checks at every stage of production to guarantee that your parts meet the required performance and aesthetic standards.
Q4: What materials does Ronningen work with for plastic injection molding?
Ronningen works with a wide variety of materials, including polypropylene, ABS, polycarbonate, and high-performance thermoplastics. Our team helps you select the best material for your part based on its function, durability, and environmental requirements. Additionally, we offer custom coloration services to meet your specific design needs.
Q5: Does Ronningen provide prototype injection molding services?
Yes, Ronningen specializes in prototype injection molding. Our rapid prototyping services help you test and refine your designs before full-scale production. We work closely with you to ensure that the prototype meets all functional and aesthetic requirements, saving you time and reducing the risk of costly errors during production.