Rotational Molding Could Help Skyrocket Your Business’ Success

Rotational molding is a highly specialized manufacturing method that’s ideal for creating everything from storage tanks to playground equipment. Also known as rotomolding, this manufacturing process has the ability to produce parts within tight tolerances, making it a popular choice to create a wide variety of hollow products. In fact, so many companies rely on this process that the industry is expected to surpass $9 billion by the end of 2033. So, could it be the right choice for your business? Our experts answer the question, “what is rotomolding” and help you decide if you should pursue it.

What is Rotational Molding?

Rotational molding is similar to injection molding, with some key differences. Like injection molding, this process involves using a pre-manufactured mold to shape a plastic polymer. However, the two methods differ slightly. Injection molding involves injecting an already-melted polymer into the mold. In the rotational molding process, the polymer is heated inside the mold, which is then spun around two perpendicular axes. The polymer then coats the inside of the mold, which creates a tight-tolerance, hollow part. Here are the steps you can expect during the rotational molding process:

Mold loading: a technician will measure an amount of polymer powder — usually polyethylene — into the mold. Though it’s possible to use other polymers, polyethylene is favored for its excellent melt flow properties, and resistance to impact, chemicals, and UV rays.
Heating: the mold is then heated as it rotates along both horizontal and vertical axes, which causes the plastic to melt and coat the interior surface of the mold. The heating process includes external and internal heat sources to ensure adequate melting of the polymer.
Cooling: once the molten plastic has covered the entire mold, it’s cooled to solidify and set the desired shape. This process is usually done using either air or water.
Product extraction: the final step is to extract the product from the mold. In some machines, the mold halves are separated, allowing for easy removal of the product. In other cases, there might be additional mechanisms or tools to aid in the extraction process.

Applications of This Production Process

Rotational molding is widely known for its ability to produce large, complex shapes with consistent wall thickness. That’s why it’s used in a wide range of industries, including:

Storage tanks: this manufacturing process is commonly used to manufacture large storage tanks for liquids and chemicals due to its ability to create seamless, durable containers.
Playground equipment: slides and swings often utilize rotational molding due to its capacity to produce smooth, rounded shapes with no sharp edges.
Automotive components: certain automotive parts, such as fuel tanks and air ducts, rely on this process for its cost-effectiveness and the ability to create complex shapes.
Agricultural equipment: corn snouts are a common product created using rotational molding, allowing for more strength and flexibility than traditional metal components.

Advantages of Rotational Molding

Now that we’ve answered the question, “what is rotational molding,” let’s talk about the benefits. This process comes with several advantages that contribute to its widespread use in manufacturing:

Design flexibility: the process allows for the creation of intricate and complex shapes that may be challenging or costly to produce through other methods.
Cost-effective: rotational molding is a cost-effective solution, especially for large, hollow products with low production volumes.
Durable and seamless: products manufactured through rotational molding are known for their durability and seamless construction. Therefore, this manufacturing process is ideal for a variety of applications.

Work with GVL Poly for Your Rotational Molding Needs

Still have questions surrounding “what is rotational molding?” Reach out to our team for answers! With more than 30 years of experience, we’re happy to help determine if this process is the right choice for your business. And when you’re ready to begin the process, we’ll be here to support you. Our services are backed by experienced machine operators, engineers, designers, tool builders, and other professionals. When you work with us, you can be sure you’re getting the best products possible.

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Ready to learn more about our services? Reach out to our team for a no-strings-attached consultation.