Heater removal can be very difficult, if the heater has arc welded itself to the inside of the heater hole. You will continue to experience heater failure if the heater is not removed with care. When a heater is removed by drilling with a size-for-size drill, the drill will cause scallops in the heater hole, [...]
Rotationally molded parts have to follow some restrictions that are different from other plastic processes. As it is a low pressure process, sometimes designers face hard to reach areas in the mold. Good quality powder may help overcome some situations, but usually the designers have to keep in mind that it is not possible to [...]
Rotational molding offers design advantages over other molding processes. With proper design, parts assembled from several pieces can be molded as one part, eliminating high fabrication costs. […]
Product designThere are many considerations for a designer when designing a part. Which factors are most important to a client? […]
The rotational molding process is a high-temperature, low-pressure plastic-forming process that uses heat and biaxial rotation (i.e., rotation on two axes) to produce hollow, one-piece parts. […]
Rock and roll machineThis is a specialized single arm machine. It rotates or rolls the mold 360 degrees in one direction and at the same time tips and rocks the mold 45 degrees above or below horizontal in the other direction. […]
Molds (or tooling) are either fabricated from welded sheet steel or cast. The fabrication method is often driven by part size and complexity; most intricate parts are likely made out of cast tooling. […]
In 1855 R. Peters of Britain documented the first use of biaxial rotation and heat. This rotational molding process was used to create metal artillery shells and other hollow vessels. The main purpose of using rotational molding was to create consistency in wall thickness and density. In 1905 in the United States F.A. Voelke used [...]
Rotational molding, also known as rotomolding, is a molding process for creating many kinds of mostly hollow items, typically of plastic. […]