Plastic Injection Molding

50 to 100,000+ Parts

Molds and Moldings

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Plastic Injection Molding Service

At Star Rapid we specialize in producing high-quality plastic injection molded parts and mold tools. We offer machining and finishing services to make tools from a variety of materials, and can produce 50 to 100,000+ finished parts in all a wide variety of plastics.

With advanced material verification, inspection and testing processes we can ensure your tools and parts exceed your expectations. If you’re ready to start your next project, contact our injection molding team for a free quote today.

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How Plastic 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. Molten 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.

Plastic Injection Molded Watch

Plastic Injection Molded Watch

Advantages Of Plastic Injection Molding

Thousands of plastic materials
to choose from

surface quality

Make large
volumes fast

Overmolding for more
design options

Stable and reliable

Tools can last up to
millions of cycles

The Plastic Injection Molding Process

Once your plastic injection mold tools are ready, 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.

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.

Injection Molded Pens

Production Of Injection Molded Parts

” Star took the utmost care to create our tooling and consulted with us every step of the way. “

Lee, Glass on the Grass

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Plastic Injection Molding Resources

Design For Manufacturing

It’s important to design for manufacturing when developing new products to avoid costs and delays. Learn more about design for manufacturing.

Visual Quality Standards

Learn more about the visual quality standards we apply to plastic injected molded parts to ensure high quality.

Plastic Injection Molding Materials

We offer a range of materials for your mold tools and injected parts. Learn more about what we have to offer.

Cause And Avoidance Of Sink Marks

Read our white paper on what causes sink marks in plastic injection molding, and how to avoid them on your next project.

Color Consistency

Challenges can arise when trying to achieve color consistency in your parts. Read our color consistency white paper to learn more.

One Man One Mold Service

OMOM provides injection tooling in half the time by streamlining the process using one machinist who owns the project from start to finish.

Plastic Injection Molding Tolerances

All plastic material will expand and contract under the influence of heat and moisture. Our tolerance guide will give more general information on the characteristics of most common resin types for typical part features.

We will work closely with you to optimize your designs for manufacturing. We will indicate any areas where poor design may produce thermal stress, shrinkage, warping, etc. Consult our design guide for more information on common defects and how to avoid them.

Unless otherwise specified, we comply with the DIN 16742 standard tolerances for plastic injection moldings. Read about the visual quality standards that we apply to injection molded parts.

Tooling for Injection Molding

Tool For Injection Molding

Plastic Injection Molding Articles

The Ten Most Popular Plastic Injection Molding Materials

One of the most important aspects of any product development project using plastic injection molding is choosing the right material, as it directly affects the molding operation and also the part performance. There are thousands of plastic materials available in the...

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The Top 7 Methods For Forming Plastics

  Plastic objects are of course found everywhere in our daily lives, but many people don’t know that there are different ways to form it for commercial or industrial use. Here are the seven most common methods, and what you need to know to decide which one is best for...

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