Plastic Injection Molding Service
At Star Rapid we specialize in producing high-quality plastic injection molded parts and mold tools. We have all equipment and expertise in-house to provide full production-quality CNC machining services to make tools from a variety of materials, and can produce 50 to 100,000+ finished parts in a wide variety of resins.
Using advanced raw material verification and quality assurance, we excel at making tools and finished parts to exceed your expectations. If you’re ready to start your next project, upload your product design information for a competitive injection molding quote today.
How Injection Molding Works
Plastic injection molding is by far the most common way to produce large volumes of finished plastic parts for every kind of commercial and industrial use. In this process, melted liquid resin is injected under high pressure into the cavity of a metal die and then rapidly cooled, forming a solid shape. A single cycle to make a finished part may take anywhere from a few seconds to minutes depending on part complexity and size.
Know Your Injection Molding Raw Materials
Virtually any type of thermoforming resin can be used in the injection molding process, and there are thousands of kinds to choose from in order to achieve just about any performance that you need for your project. Check out our list of frequently used materials.
The Molding Process
Once your mold tools have been carefully designed and manufactured, the molding process consists of the following basic steps:
Step 1. The plastic resin comes in raw pellets. These are dried to the right moisture content, and then if necessary they can be blended with pigments or master batch colorants.
Step 2. The dried pellets are poured into the hopper of the molding machine. A reciprocating screw inside the barrel of the machine will transport these pellets towards the mold while at the same time heating them.
Step 3. Within the barrel, the pellets are mixed and heated until fully molten, forming the liquid resin.
Step 4. The heated mold closes automatically and resin, under great pressure, is injected through a gate and into the mold cavity.
Step 5. The mold is cooled to solidify the part inside.
Step 6. The mold opens and the part is ejected to begin a new cycle.
Want to learn more about injection molding?
Advantages Of Plastic Injection Molding
There are many advantages to plastic injection molding. These include the ability to make large volumes of parts quickly, high surface quality, many resins to choose from, and durable tooling that can last for years.
Thousands of plastic resins
Scalable for larger volumes
Stable, repeatable and efficient
Excellent surface quality
Overmolding for more options
Production quality tools
Injection Molding Resources
Design For Manufacturing
Our engineers work closely with you to optimize your part design for maximum molding efficiency and part quality.
We have a robust supply chain of engineering grade thermoforming resins. Learn more.
Visual Quality Standards
Visual quality inspection is an important part of ensuring your complete satisfaction.
Avoidance Of Sink Marks
Sink marks can be a concern but there are strategies for controlling them. Here’s how.
All plastics expand and contract to a certain extent under the influence of heat and moisture. Our tolerance guide gives you general information on the shrinkage characteristics of most common resin types to help guide your design decisions.
We work closely with all of our customers to optimize their designs. We indicate any areas where poor design may produce thermal stress, shrinkage, warping or other avoidable defects. For more information, consult our design guide on common defects and how to avoid them.
Unless otherwise specified, we comply with the DIN 16742 standard tolerances for injection moldings.
Plastic Injection Molding Quickfacts
What is the injection molding process?
First, raw material usually arrives in the form of plastic pellets. These pellets must be carefully dried to the correct moisture content, at which time they can also be colored with pigments. The pellets are then mixed and heated by the machine’s reciprocating screw until the resin is completely molten. Under high pressure this liquid plastic is injected into the hollow cavity of a mold tool and allowed to cool, forming a solid part that is then ejected from the cavity to begin the next cycle.
What are the advantages of injection molding?
Once a tool is made, plastic injection molding is the fastest and most cost-effective way to make up to hundreds of thousands of finished plastic parts. Molded parts have excellent surface finishes with reliable and repeatable dimensional tolerances.
How long does it take to make an injection mold tool?
Depending on the complexity of the design and possible heat treatment, a plastic injection mold tool can be made in five days to two weeks.
Why Choose Star Rapid for Plastic Injection Molding?
The finest production mold tools start with quality raw materials, strict process control and expert toolmakers. Only a supplier with years of experience supporting Fortune 500 companies can ensure repeatable results for your production tooling needs. Here are some of the advantages that Star Rapid offers for high-volume production toolmaking and injection molding services:.
✓ An Extensive Range of Services
We can support projects of any size, with clamping pressures from 10 to 500 tons. In addition, we have a full suite of machining, finishing and assembly services to offer a complete product development solution.
✓ A History of Success
We’ve helped thousands of clients, from startups to Fortune 500’s, bring their new product ideas to life. Check out our “See Our Past Projects” section below to learn more about what we can do for you.
✓ Material Verification and Testing
We use only the most sophisticated analytical and testing instruments to verify the exact chemical and physical characteristics of all incoming raw materials. This is not just a part of our careful quality control but also ensures your product’s performance and regulatory compliance.
✓ Design for Manufacturing Support
Our skills and services extend beyond manufacturing. We work closely with every client on every project to optimize your design so you get superior product performance. And of course, sales and technical support is available 24/7.
✓ Intelligent Quotations for Every Project
We support your development goals by having no minimum order volumes or value. In addition, we have a proprietary AI quoting algorithm that provides fast, accurate and transparent pricing on every project, every time.
See Our Past Injection Molding Projects
Powelectrics Sensing and Telemetry Solutions designed its flagship IoT hardware device, the Metron4, to make remote monitoring simple. Portable and durable, the Metron4 is outfitted with a wide range of sensors capable of monitoring temperature, pressure, humidity, vibration, energy consumption and more. Read this case study to learn how we developed the Metron4 housing while optimizing for durability and functionality. Read more…
Harnessing the power of the portable Raspberry Pi controller, the OTTO digital camera allows users to capture photos in fully-customizable modes and upload them to their smartphones in seconds. OTTO partnered with Star Rapid to develop a prototype that was portable, aesthetically pleasing and easy to use. Learn how we brought OTTO to life in this case study. Read more…
Working with Marco Beverage, our injection molding technicians helped to design and manufacture a reservoir from Eastman Tritex 2001 polyester. Read about the step-by-step process used to develop this product and learn how we finished with a food-grade, high-gloss, ultra-durable product that met Marco Beverage’s expectations in every respect. Read more…
Injection Molding: Further Reading
When developing a new product, you should choose the type of plastic resin that offers the best performance for your application. In this review we offer some useful tips to help you find the plastic that’s best suited for your needs. Read more…
As a premier provider of plastic injection molding services, Star Rapid has manufactured countless products to support a variety of industries. Please check out this blog for useful tips on improving designs in four important areas. Read more…
For injection molding, the type of resin is not the only material choice you need to make. The type of metal used to make the mold tool also plays a large role in the success of production. In this guide, our molding team gives you the information you need to make an educated decision before production.Read more…
Getting the best results from injection molding requires that the manufacturer has a keen understanding of how several forms of pressure interact during the molding process. In this blog, we explain the interaction of injection, holding, clamping and back pressure.Read more…
Star Rapid Injection Molding Service FAQ
What makes Star Rapid’s injection molding service special?
Our molding service is strengthened by our extensive expertise and a wide range of production capabilities. Our industry-leading facilities allow us to handle projects ranging from micromolding (10 tons) to large projects over 500 tons. This means we are capable of producing parts ranging from millimeters to cubic meters in size. Further, we have unique access to tooling experts with decades of experience. They are available for video conferencing and customer support.
Can Star Rapid provide design services, industrial design support, or product development support as an extension of their molding services?
All orders are carefully reviewed by our tooling engineers to provide design for manufacturing optimization. We also work closely with outside design consultancies who can offer expert advice on moving a product from the concept stage to production-ready.
What are Star Rapid’s quality standards for their molding services?
Our quality-control system includes several steps to ensure safe, high-performing products for our clients. As with all of our services, we conduct comprehensive material verification and testing before molding begins. During production, we carefully control all processing conditions — including temperature and humidity — to maintain repeatable results. Many molding companies neglect to do this, which can lead to flaws in the finished parts. We also 3D scan complex shapes to ensure accuracy.
What types of tools and resins do you offer?
We make tools and dies from S136H, 2316H, H13 hardened, 2316H, P20, 8407 and NAK80 semi-hardened steels. We offer standard SPI finishes, EDM texturing and several different types of etched textures. We also have thousands of thermoforming plastics available – contact us for details.
Request Your Free Injection Molding Quote Today
Our improved AI algorithm decreases quotation times by up to 90%. Most quotes are delivered within 24 hrs. and usually much faster, depending on project details.
Your customer support partner will contact you directly to ensure you’ve received and understand all aspects of your quotation and to answer any questions you may have.Request a Quote