Rotomolding Process What is the Rotomolding Process? The rotomolding process allows products to be manufactured in a way that creates extremely strong, long lasting, durable parts. Rotomolded parts are resistant to deterioration from chemicals, the elements or environmental stresses. The applications of this process range from playground equipment to nuclear warhead covers, from agricultural tanks to tornado shelters, from furniture to construction materials. The rotational molding process as well as the materials used during rotomolding pair to create these extraordinary parts.

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What Is Rotational Molding? Rotational molding also referred to as rotomolding or rotational casting is a low pressure process used to manufacture hollow plastic parts. It involves placing a powdered plastic material resin or polymer powder into a mold that is slowly rotated around two perpendicular axes, relative to each other, while heated in a large, very hot oven. The powdered material slowly tumbles in the rotating mold, reaching internal temperatures of degrees as it melts together and sticks to the inside wall of the mold.

After the plastic resin is melted and cured, the molds are moved into the cooling chamber, while still rotating, where the heated plastic material is slowly cooled as it continues to retain the shape of the inside of the mold. There are many methods for crating plastic parts. Injection molding is the most recognizable form because we use injection molded parts everyday such as typical water pitchers, cell phone housings, plastic drinking glasses, and a variety of familiar everyday use items.

Injection molding involves melting plastic pellets and introducing the molten material by a high pressure screw injector into a mold then cooled. Both the inside and outside surface of the part is defined by the mold; hence, hollow parts are not created. Other popular plastic forming processes are extrusion or thermoforming vacuum forming. Hollow parts are generally made with either blow molding or rotational molding.

Blow molding is a process by which a bubble of molten plastic is expanded inside a mold through air pressure to take the shape of that mold creating high volume products such as milk jugs or shampoo bottles. Rotational molding is fundamentally different because it is a low-pressure process that relies on gravity to distribute the plastic to form the desired shape. What Does Rotational Molding Produce? Rotational molding allows for production of a countless number of usable items in a variety of shapes and sizes.

We are surrounded by hollow products in everyday life including city garbage cans, fuel containers, toys, and a variety of decorative items.


How the Rotational Molding Process Works

We use this technology in a wide range of applications due to its ability to produce different shapes and sizes utilising various material properties. Rotational molding in 4 steps Rotational moulding process can be explained in 4 key stages : Once the mould has cooled and the part solidified it can be unloaded. The rotomoulding production cycle lasts between 20 minutes and a few hours depending on the size and thickness of the part to be produced. Finishing: to control deformation, the parts are held in conformers and subjected to leak tests. Then, parts can be deburred, flamed, finished manually or by a mechanised process. Get started Why to choose rotomoulding?



Products created through the rotational molding process consist of a variety of colors, finishes, materials, performance characteristics, and surface textures. Rotational molding also economizes product design and manufacturing better than blow molding or conventional injection molding. Rotational molding is a 3-stage, no-pressure plastic molding process: Heating — The mold slowly rotates in two planes biaxial rotation. Heat transfer causes the plastic charge inside the mold to melt and uniformly coat the interior of the mold. Unloading — The part is removed from the mold and a new charge of material is loaded into the mold. RotoSpeed rotational molding machines enhance this process with design styles that vary the configuration of these three stages.


What Is Rotational Molding?

Rotational Molding is one of many plastics manufacturing processes producing extremely durable parts and components with a very long usable lifespan. It has began growing immensely in popularity and functionality, thus growing in a larger demand in some industries in comparison to other plastics processes such as plastic injection molding, thermoforming or blow molding in some aspects. The Rotational Molding process provides a number of advantages including cost effectiveness, quality finishing, little to no size limitations and the fact that it is considered eco-friendly in many aspects due to its ability to recycle and re-use materials easily and readily. With Granger Plastics Company , you will find an American industry leader and rotomolding authority with extensive and specialized experience with complex products and a company offering a complete set of secondary services including trim, assembly, foam filling, packaging, drop shipping, material conversion from less durable materials to polyethylene and more. Granger Plastics can also provide engineering and rotational molding design expertise that can aide in bringing your products to market faster or can help determine if the rotational molding process is right for your project! Learn more across the links below for additional Rotational Molding Information. What exactly is Rotomolding?

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