What is Rotational Molding?

Rotational molding, also known as rotomolding, is a manufacturing process used to produce hollow plastic parts. It is a technique that involves the heating, melting, and shaping of plastic materials in a rotating mold to create a wide range of products.
The rotational molding process typically involves the following steps:
Mold Preparation: A hollow mold, typically made of metal, is prepared to the desired shape of the final product. The mold is typically divided into two or more parts to allow for easy removal of the finished product.
Material Loading: A measured amount of powdered or liquid plastic resin is placed into the mold. The choice of material depends on the desired properties of the final product.
Heating and Melting: The mold is sealed and placed in an oven or heating chamber. The mold is slowly rotated bi-axially along two perpendicular axes while the chamber is heated. The rotation ensures even distribution of the molten plastic inside the mold.
Coating and Cooling: As the mold rotates, the melted plastic adheres to the inner walls of the mold, gradually forming a hollow shape. After a specific time, the mold is cooled, either by air or water, to solidify the plastic.
Demolding: Once the plastic has cooled and solidified, the mold is opened, and the finished product is removed. In some cases, additional post-processing steps like trimming, painting, or assembly may be required.
Rotational molding offers several advantages. It allows for the production of large, seamless, and structurally strong parts with uniform wall thickness. It also enables the manufacturing of complex shapes, including products with intricate details, without the need for additional assembly. Additionally, the process is relatively low-cost compared to other molding techniques and is suitable for both small and large production runs.
The applications of rotational molding are diverse and include products such as storage tanks, containers, automotive parts, playground equipment, toys, furniture, and even medical devices. The process is particularly well-suited for producing large, hollow objects or products that require durability and impact resistance.
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