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The Rodon Blog - A Focus on Plastic Injection Molding and American Manufacturing

Hydraulic, Electric, and Hybrid Plastic Injection Molding: Which Process is Right for You?

Posted by Jill Worth

11/18/16 1:30 PM

Design engineers have various options when choosing a plastic injection molding process to best suit their specific application. Each of the three primary methods — hydraulic, electric, and hybrid — feature unique benefits and drawbacks. To make the right selection for your project, it’s important to have a full understanding of how these methods differ and what they can offer you.

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Topics: Plastic Injection Molding, Plastic Manufacturing, Plastic Injection Molds and Presses

Injection Molds 101: Cold Runner vs. Hot Runner Molds

Posted by Jill Worth

4/26/16 6:00 AM

Every plastic part starts in a mold. Injection molds are classified into two main types, cold runner and hot runner. Each has its advantages and disadvantages. Your plastic injection molder will be able to give you the costs and benefits of using these different systems. However, by understanding the key differences of these technologies, you can have a more educated discussion on the type of mold that would best fit your project. 

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Topics: Injection Molding Basics, Plastic Injection Molds and Presses

Plastic Injection Molding Basics 101 - The Injection Press

Posted by Jill Worth

3/15/16 10:48 AM

Our website is frequently visited by product designers, engineers and purchasing agents who are looking for information on plastic injection molding. With this in mind, we created a series of "Basics 101" type articles that are developed to give our readers a better understanding of the presses, processes and pitfalls in our industry. 

We begin our series with information on the basics of plastic injection molding presses. We hope you find this information useful.  If you have specific questions, please do not hesitate to contact us.

Injection Press Basics

While plastic injection molders will help you determine the size of the machine needed to get the best result, a project designer or engineer can get a good estimate based on some basic information. By knowing approximately what size machine will be required, you can better source a plastic injection molder that will meet your needs.

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Topics: Plastic Injection Molding, Injection Molding Basics, Plastic Injection Molds and Presses

Top tooling tips to ensure perfect plastic parts

Posted by Jill Worth

3/10/16 9:30 AM

A perfect, precision part begins with the mold. Building the tool takes time and a great deal of accuracy. It can also represent the largest investment in the manufacturing process, so getting it right is critical to the success of a project. If your goal is to manufacture parts with a high degree of precision in large-volume, the tooling becomes even more complex.

When plastic meets the mold

The tool and the molding process are customized based on the type of plastic. Plastics that are amorphous are less free-flowing and tend to shrink less than crystalline or semi-crystalline plastics, which offer better flow, but higher shrinkage. For this reason, many projects call for engineering resins that provide a better melt and less shrinkage. Plastic suppliers provide information on the shrinkage rate of their resins along with temperature and melt flow rate recommendations.

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Topics: Plastic Injection Molding, Plastic Injection Molds and Presses

Plastic Injection Molding 101 - Costs of Manufacturing a Mold

Posted by The Rodon Group Marketing Team

12/10/15 9:30 AM

A common question for designers and engineers is “How much will a plastic injection mold cost?”  It makes sense. Injection molds represent the greatest expense in upfront production costs. And, there are many factors that go into determining the cost. With any custom injection molding project, your injection molder will be able to give you the final price tag.

In this article, we will review the variables that can impact the cost so that you can be better informed in making a mold purchasing decision. 

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Topics: Plastic Injection Molding, Injection Molding Basics, Plastic Injection Molding Costs, Plastic Injection Molds and Presses

The Heavy Truth about Injection Molds

Posted by The Rodon Group Marketing Team

11/5/15 5:30 AM

Seven hundred pounds of hardened stainless steel. That’s the average weight of an injection mold. Some can weigh over a ton, some just a few hundred pounds, but any way you slice it, you certainly wouldn’t want one to fall on your foot.

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Topics: Plastic Injection Molding, Plastic Manufacturing, Plastic Injection Molds and Presses

How to Build a Precision Mold for Perfect Parts

Posted by Paula Hynes

9/24/15 11:30 AM

A perfect, precision part begins with the mold.  Building the tool takes time and a great deal of accuracy.  It can also represent the largest investment in the manufacturing process, so getting it right is critical to the success of a project.  If your goal is to manufacture parts with a high degree of precision in large-volume, the tooling becomes even more complex.

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Topics: Plastic Injection Molding, Plastic Injection Molds and Presses

Top 5 Types of Plastic Molding 

Posted by Paula Hynes

8/11/15 10:00 PM

In today’s manufacturing environment, plastics are being used to make everything from automotive body parts to human body parts. Each application requires a special manufacturing process that can mold the part based on specifications. This article provides a brief overview of the different types of molding and their advantages and applications.

Blow Molding – Well suited for hollow objects, like bottles

The process follows the basic steps found in glass blowing. A parison (heated plastic mass, generally a tube) is inflated by air. The air pushes the plastic against the mold to form the desired shape. Once cooled, the plastic is ejected.

The blow molding process is designed to manufacture high volume, one-piece hollow objects. If you need to make lots of bottles, this is the process for you. Blow molding creates very uniform, thin walled containers. And, it can do so very economically.

Compression Molding – Well suited for larger objects like auto parts


The name of this molding method says everything.  A heated plastic material is placed in a heated mold and is then compressed into shape. The plastic can be in bulk but often comes in sheets. The heating process, called curing, insures the final part will maintain its integrity. As with other molding methods, once the part has been shaped, it is then removed from the mold. If sheeting plastic material is used, the material is first trimmed in the mold before the part is removed.

This method of molding is very suitable to high-strength compounds like thermosetting resins as well as fiberglass and reinforced plastics. The superior strength properties of the materials used in compression molding make it an invaluable process for the automotive industry.

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Topics: Plastic Injection Molding, Plastic Injection Molds and Presses, The Rodon Group

A Well-Designed Injection Mold Leads to Manufacturing Success

Posted by Paula Hynes

7/7/15 11:05 AM

In our first installment in this series of articles on how to make a quality custom plastic part, we discussed the design factors you need to consider when developing your product.  Designing for manufacturability is the first step in making a high-quality part.  In this article, we focus on building and testing a plastic injection molding tool.

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Topics: Plastic Injection Molding, Plastic Injection Molds and Presses

Plastic Part Design and Manufacturability

Posted by Paula Hynes

5/12/15 9:00 AM

There are four key factors that go into making a high-quality plastic injection molded part: part design, tool building, material selection and manufacturing.

In this article, we will start at the beginning of the process, with the part design.

The process of plastic injection molding is designed to produce precision parts at a low cost.  The part design must be developed to maximize the efficiency inherent in high-volume molding.  With the right design, parts can be made consistently and with quality.  Without a good design, costly processing mistakes can be made.

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Topics: Plastic Manufacturing, Manufacturing, Plastic Injection Molds and Presses

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