Rotomolder Manufacturers and Companies

IQS Directory provides a detailed list of rotomolder companies and suppliers. Find rotomolder companies that can design, engineer, and manufacture rotomolder to your specifications. Peruse our website to review and discover top rotomolder companies with roll over ads and complete product descriptions. Connect with the rotomolder companies through our hassle-free and efficient request for quote form. You are provided company profiles, website links, locations, phone numbers, product videos, and product information. Read reviews and stay informed with product new articles. Whether you are looking for manufacturers of plastic rotomolded products, high speed rotomolding boxes, and polyethylene rotomoldings of every type, IQS is the premier source for you.

  • Orange, CA 877-768-6585

    As a full-service rotational molding company, Roto Dynamics is your source for high quality, custom rotomolded products. Since our inception, we have continued to earn success by closely working with our customers, developing innovative and tailored solutions. We are with you every step of the way, from design and development to production and assembly. For a complete view of our capabilities and services, check out our website, or submit a request for quote to see how we can serve you!

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  • Pearland, TX 281-648-0909

    We are a custom manufacturer of rotationally molded products. Our state of the art technology creates precise, cost effective and dependable products. Whether your order is large or small, we want to be sure you are satisfied. We also manufacture a standard line of chemical storage and process tanks. All of our products go through rigorous testing. The safety of those working with or near our tanks and the environment is a top priority for us.

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  • Winfield, KS 620-221-9464

    No matter what your blow molding needs are Western Industries is ready to assist you. We believe in thinking outside the mold and using unique methods to come up with large-part blow molding solutions for our customers. We have access to state-of-the-art technology and over 100 years of combined experience serving a variety of industries. When you choose Western Industries, you have the Western Advantage. Call today for more information!

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  • Elberfeld, IN 800-304-4600

    We provide outstanding custom plastic rotational molding. Our teams offer short lead times and we will assist you from concept to production. All of our materials and designs are FDA approved and we can handle the most complex projects. We are your one stop shop for all of your rotational molding needs. Give us a call today to learn more information!

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  • Port Washington, WI 262-988-2002

    CPI Products specializes in custom rotomolding and metal fabrication solutions. We offer full product assembly and offer distribution, shipping, and handling support for our customers. We are dedicated to building long-term relationships with our customers and helping them achieve their goals. We pride ourselves on our ability to work closely with our customers to develop tailored solutions that meet their specific needs and requirements.

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  • Kansas City, MO 816-741-3000

    At Forte Products, we specialize in the design, manufacturing, and distribution of high-quality rotational molding plastics products. With years of experience in the industry, we have developed a reputation for excellence, providing durable, versatile, and cost-effective solutions to our client's needs. Forte Products has the expertise and capabilities to deliver rotational molding plastics products and services for various industries.

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Rotomolder Industry Information


"Rotomolder" is one of many names for the large manufacturing machines used to create hollow and seamless plastic parts. They are also known as rotational molding machines, rotomolding machines, or rotational molders. Rotomolders present overall lower costs than other forms of plastic manufacturing, like blow molding, injection molding, or thermoforming, but they are less common because they are quite complex.

Quick links to Rotomolders Information

Applications of Rotomolders

Manufacturers use rotomolders to create such products as:

  • Large Industrial Tanks
  • Water Bottles
  • Outdoor Planters
  • Construction Cones and Safety Cones
  • Pink Flamingos
  • Playground Slides
  • Helmets
  • Footballs
  • Pipe Fittings
  • Kayaks

Additionally, rotomolders are used in these industries:

  • Agriculture
  • Automotive Manufacturing
  • Chemical Processing
  • Construction
  • Food and Beverage Processing
  • Furniture
  • Marine Manufacturing
  • Material Handling
  • Packaging and Assembly
  • Pharmaceuticals
  • Plumbing
  • Recreation and Sporting Goods
  • Toy Manufacturing
  • Wastewater Management

Rotomolder Design and Function

A rotomolder typically consists of a mold, rotating spindles, an oven, a cooling chamber, and arms. It is capable of processing a variety of different thermoplastic materials, such as high density polyethylene (HDPE), low density polyethylene (LDPE), nylon, polyethylene terephthalate (PET), polycarbonate, and polyvinyl chloride (PVC).

To work, any one of these plastics are poured in powdered form onto the mold, which is made from stainless steel, aluminum, or both. Once the mold is coated, it is transferred into the oven chamber, where it continuously revolves on the rotating spindles as the metal powder melts and evenly coats the mold walls. Once the metal has completely covered the mold, the mold is transferred to the cooling chamber, where a combination of air and cold water cool and cure the molten plastic. Cooling usually takes around 20 minutes to complete.

After the plastic has dried completely, it is removed from the mold. This is typically done manually. If the plastic has shrunk during the process, as it sometimes does, this part can prove difficult. Regardless, once off the mold, the new hollow plastic part can either be sent on for shipping or sent on for further processing. Common processing procedures they undergo include cutting to size, welding with small components, painting, polishing, and cleaning.

Notable Types of Rotomolders

Rock and Roll Machines
Specially designed with small heating chambers to create long, narrow parts.
Clamshell Machines
Actually a type of rock and roll machine, though it distinguishes itself by its use of a single primary rotational arm (not counting the support arms it usually has on its ends.) Most other plastic rotational molding machines use at least two arms.
Shuttle Machines
Typically have two arms that work independently, moving the mold back and forth in between the heater and the cooler as it turns biaxially. Some shuttle machines do, however, have only one arm. In this case, the arm moves the mold horizontally from the heater to the cooler as it spins.
Vertical Rotational Machines
Smaller than most other rotomolding machines. They are considered small to medium in size. They are valued for their energy efficiency, which comes from their compact heating and cooling chambers.
Carousel Machines
One of the most commonly used rotational molding machines. Carousel machines may have up to four arms and six stations, and they come as either fixed or independent equipment. Typically, fixed arm carousel machines consist of three arms that are required to move together, while independent arm carousel machines have between three and four arms, all which move separately from one another. Both types of carousel machines are available in a wide variety of sizes.
Swing Arm Machines
Can have up to four arms, all of which move biaxially. The arms, which do not all have to be engaged at the same, are mounted on the respective corners of the machine, where they swing in and out of the oven.

Benefits of Using Rotomolders

While there are many other types of molding machines available, the rotomolder stands apart as a machine that eliminates unsightly seams in both small products in large quantities and large products in small quantities. It also creates plastic formations that are uniform in both quality and precision wall width. To find out more, share your specifications with one of the skilled manufacturers we have listed on this page!

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Rotomolders Informational Video