Leading Rotomoulding Manufacturers

Rotomolded products are seamless, uniform in wall thickness and of single construction, which eliminates costly fabrication processes and the need for replacement parts. Rotomolded products include safety cones, plastic tanks, footballs, helmets, kayaks, playground slides, pipe fittings and outdoor planters. Read More…

Rotomoulding Rotomoulding is a thermoplastic fabrication technique that manufactures hollow plastic products by using heat and a revolving metal mold.

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 ...

Roto Dynamics Inc. $$$

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.

Sherman Roto Tank $$$

Western Industries Plastic Products, LLC, specializes in large-part plastic blow molding. We provide expertise and services in product design, process improvement, and product assemblies. We offer our customers comprehensive services and turnkey opportunities to achieve their specific project goals. We can assist with: R&D, product design, product improvement, and secondary-fixture design. For...

Western Industries Plastic Products LLC $$$

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!

Fibertech Plastics $$$

Michiana Rotational Molding provides unparalleled rotational molding services that ensure efficient design, innovation, and functionality. Based in southwest Michigan, the company offers engineering, prototyping, finishing, design consulting, and quality control services. It has experience creating solutions for clients in the marine, home and garden, RV, and material handling industries and more ...

Michiana Rotational Molding $$$

Our warehouses and equipment are designed to protect the quality and condition of the rotationally molded plastic products we sell and process. Our facilities feature state of the art equipment, and are run by a team of dedicated staff members who will help you find what you need. Contact us today!

Lerner Molded Plastics $$$

At Gator OEM Solutions, we take pride in being a leading provider of innovative rotational molding solutions, dedicated to delivering high-quality products and exceptional services to our clients across various industries. With years of experience and a passion for excellence, we have established ourselves as a trusted partner in the field of rotational molding. Our product portfolio encompasses...

Gator OEM Solutions $$$

At D&M Plastics Inc, our expertise lies in delivering exceptional rotational molding solutions, elevating the standards of custom plastic manufacturing. With a legacy rooted in innovation and a relentless pursuit of excellence, we stand as leaders in crafting superior-quality plastic products through the rotational molding process.

D&M Plastics Inc $$$
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The most common thermoplastic material used in the rotomoulding process is polyethylene, other materials include polypropylene, polyvinylidene fluoride, nylon and polyvinyl chloride. These high purity plastics are exposed to high heat and therefore must exhibit good thermal stability. To enhance properties like flame retardancy, water and chemical resistance as well as the ability to withstand extreme temperatures, many resin powders contain additives, which can also alter the color, texture, finish and appearance of the cured plastic's surface.

Rotomoulding is an alternative to blow molding, injection molding and thermoforming, but is not as common because of the large, expensive machinery that is used to form the products. Still, this molding process is used within the sporting goods, waste water management, marine, sporting goods, pharmaceutical, construction, toy manufacturing, food and beverage processing, chemical, plumbing, agricultural, furniture, packaging and material handling industries, among others.

The rotomoulding process begins with fabricating the mold by welding, for simpler designs, or die casting, for more complex constructions. The molds are made of stainless steel, aluminum or a combination of both, when wall thickness is not uniform. The rotomoulding machine is composed of a series of different molds, which are mounted on rotating spindles and revolve on one or two axes. The polymer resin powder, which must be very fine in order to coat all areas of the mold, is poured and sealed in. The rotomoulding machines are then transported to an oven chamber while they continuously revolve. Once under high heat, the powder melts and evenly covers the mold walls.

Next, it travels to a cooling chamber, which uses a combination of cold water and air to cure the plastic. This takes about 20 minutes. Once the plastic has fully dried, the molds are manually unloaded, which can be difficult if the plastic shrinks. Right out of the mold, rotomoulded products are hollow parts without any openings or holes; they are cut out if needed. The plastic is often cleaned, polished, painted or welded with small components as final post-forming fabrications.

Rotomoulding Informational Video

 

Rotational Molding Power Pages

Rotational Molding

Blow Molding

Rotational molding, commonly referred to as "rotomolding", is a plastic casting technique used to produce large hollow, seamless, and double-walled parts. It is a three-stage process that involves a mold on a rotating frame, a heating chamber, and a cooling chamber. Molds for the rotomolding process are specially designed....

Blow Molding

Blow Molding

Blow molding is a type of plastic forming process for creating hollow plastic products made from thermoplastic materials. The process involves heating and inflating a plastic tube known as a parison or preform. The parison is placed between two dies that contain the desired shape of the product...

Compression Molding

Compression Molding

Molding is a manufacturing process that uses a mold - the latter being a solid container used to give shape to a piece of material. It is a forming process. The form is transferred from the mold to the material by...

Plastic Coating

Plastic Coating

Plastic coating is the application of liquid polymers or plastic on the surface of a workpiece by dipping or immersion. The result is a thick plastic finish for protective and decorative purposes. This gives the material additional resistance against...

Fiberglass Molding

Fiberglass Molding

Fiberglass molding is a method for forming complex and intricate parts using fiberglass resin. Though there are several reasons for producing parts and components from fiberglass, the most pressing reasons are the...

Polyurethane Molding

Polyurethane Molding

Polyurethane molding is the process of fabricating or manufacturing plastic parts by introducing a urethane polymer system into a tool or mold and allowing it to cure. Like any other type of plastic, the excellent processability...

Plastic Injection Molding

Plastic Injection Molding

Plastic injection molding, or commonly referred to as injection molding, is a manufacturing process used in the mass fabrication of plastic parts. It involves an injection of molten plastic material into the mold where it cools and...

Rubber Molding

Rubber Molding

Rubber molding is a process of transforming uncured rubber or an elastomer into a usable product by transferring, compressing, or injecting raw rubber material into a metal mold cavity...

Rubber Injection Molding

Rubber Injection Molding

Rubber injection molding is when uncured rubber is transformed into a usable product by injecting raw rubber material into a mold cavity made of metal. The applied pressure produces a chemical reaction like...

Plastic Molding Processes
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