What is Plastic Rotational Molding?

Jul 10, 2023

Rotational Molding Overview

Rotational molding is a process for manufacturing hollow plastic products.  The process consists of introducing a known amount of plastic (in powder, granular, or liquid form) poured into a hollow, shell-like mold.  The mold is rotated about on two principal axes at relatively low speeds. As it is heated so that as the plastic melts it adheres to the mold surface.  The mold rotation will continue during the cooling phase, this way the plastic retains the desired shape as it solidifies.  Once the mold has cooled, the part can be “demolded” and any secondary work such as trimming/assembling can take place.

Rotational Molding has several benefits including the ability to produce thicker-walled parts than blow or injection molding by simply increasing the amount of resin introduced to the mold. Another advantage of rotational molding is the molds/tools are much more economical to produce than blow or injection mold tooling. One disadvantage of rotational molding is the time necessary to produce parts. This makes rotational molding best suited for lower estimated annual units (EAUs).

Revolv Manufacturing

Revolv Manufacturing (formerly known as Stern Companies Incorporated & sister company to AxisNorth Solutions) produces rotationally molded plastic products in our 50,000 sq. ft. production facility located in Brainerd, MN.  We currently run four Ferry RotoSpeed machines in our facility 5 days a week / 24 hours a day.  Industries we support are agriculture, recreational, marine, waterworks, snow removal, as well as a variety of other industries.  We have engineers on staff to help answer questions you may have regarding your roto-molded project.

Revolv MFG has a full assembly shop as well with the ability to procure and assemble components to customer specifications.  Revolv is ISO 9001 certified and has a strong supplier base providing customers with quality products, delivered on time, at the lowest achievable cost.  Get in touch today and let us help you with your next rotationally molded project!