Rotationally Molded Plastics banner

Roto Moulders

A reliable source for Rotationally Molded Plastic information and leading Rotationally Molded Plastic Companies & Suppliers.

Rotomoulding is an alternative to thermoforming, blow molding and injection molding, and although it is lower in cost, this process is not as common because of the complex and large machinery required for the fabrication process. Read More…

Roto Moulders Roto moulders are large machines that economically fabricate many different seamless, single part plastic products. They use a combination of high heat, rotation and metal moulds to create plastic constructions that may be as small as a water bottle and or the size of a large storage tank.
Request for Quote

Leading Manufacturers

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!

Request A Quote

Roto Dynamics Inc. $$$

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.

Request A Quote

Sherman Roto Tank $$$

Ootsburg, WI  |  920-564-3633

In business since 1967, Dutchland is one of the top 5 manufacturers of custom rotational molded plastic products in North America. Whether it’s the size of your plastic product or the need to scale your production quickly, Dutchland gives your company the ability to Go BIG.

Request A Quote

Dutchland $$$

Rochester, IN  |  800-633-9173

RRM is a manufacturer of Rotationally Molded products, as well as a custom mold builder. Recently we have focused on advanced and innovative designs for our own proprietary products as well as for our custom products. These solutions are developed in order to add quality, value, and integrity to the products that we produce. RRM has been involved in the process of rotational molding since1988.

Request A Quote

Rochester Rotational Molding, Inc. $$$

Fountain, CO  |  719-382-9300

RMB Products offers custom plastic fabrication using thermoplastics. We perform the plastic machining as well. Some of the plastic parts we have produced include hydraulic reservoirs, pressure dispense vessels, sump tanks, process vessels and plastic tanks.

Request A Quote

RMB Products $$$
placeholder image Roto Dynamics Inc. Sherman Roto Tank Dutchland Rochester Rotational Molding, Inc. RMB Products

Roto moulders produce many different parts and products for the food and beverage processing, medical, pharmaceutical, waste management, marine, sporting goods, recreation, toy, packaging, materials handling, automotive, plumbing and construction industries.

They are composed of a series of moulds, an oven, a cooling chamber and large mould spindles that are mounted on a rotating axis. The roto molding process begins with the fabrication of the mould, which is made either of stainless steel or aluminum.

Rotomolded 185 Gallon Containment Basin Roto Moulders - Sherman Roto Tank

Depending on the complexity, they are either welded or die cast. Aluminum moulds are thicker, since it is a softer metal. The polymer resin, in the form of fine powder, is poured into the mould. The spindles begin rotating in two directions into the oven chamber.

Under high heat, the plastic melts and evenly coats the inside walls of the mould. To cure, the moulds are then taken to a cooling chamber.

There are several different types of roto moulders, and they include rock and roll, clamshell, vertical rotational, shuttle and carousel machines. Rock and roll machines are composed of an arm that holds a large mould.

Clamshell machines are also single-arm configurations and are considered small. Vertical rotational machines are energy efficient and can fit into compact heating and cooling chambers. Shuttle machines move the moulds from different heating and cooling areas.

They can fabricate large numbers of products at once, but require a lot of operating space. Finally, carousel machines, which are the most common type, have several arms that can be in the heating or cooling chambers simultaneously. The cooling process takes about 20 minutes.

Once the plastic has cured, the newly formed product is unloaded manually, which can be difficult if the plastic has shrunk during the process. Parts that emerge from roto moulders, if they are intended to have holes or openings, must be sent for additional processing like cutting and surface finishing.

Roto Moulder Informational Video

 
Plastic Molding Processes
Featured Industries