What Exactly Is Rotational Molding? Check This Guide!

The history of plastic molding dates back to 1800s, and while there are varied kinds of techniques used for creating plastic products, rotational molding or rotomolding has emerged as one of the popular options. The molding technique is used extensively for creating large, hollow parts made of plastic, such as manholes, tanks, coolers, and kayaks. Rotational molding is used for creating products that require uniform wall thickness, and also for plastic parts that need a superior finish. You can find more information on plastic molding techniques online, but for this post, we are discussing all that you must know about the benefits, limitations and other aspects of rotational molding.

How is rotational molding different?

In case of injection molding, the resin material is usually forced into the mold by pressure, this taking the shape of the desired object as per the mold. On the other hand, rotational molding is done by coating the inner surface of the mold with liquid plastic resin material. This kind of molding just ensures that the products created have walls with uniform thickness.

What are the benefits?

While rotational molding does offer a few benefits over regular injection molding methods, it should be noted that this is not ideal for every product. The foremost advantage of rotational molding is low cost of molds, because the operating pressure is much lower. The molds can be, therefore, made of low-cost materials, including aluminum. Since the mold is rotated to coat the material, the thickness of walls is ensured, and it is possible to make products that require a double-walled design. Probably one of the biggest benefits of rotational molding is durability and stability of the products created. Products can made as a single, one-piece item, so there is no further need for processing or joining, which may otherwise require more investment. Products made using rotational molding are also easy to design, so additional logos, textures can be added as required.

In conclusion

Whether rotational molding is ideal for creating certain products can be best discussed while talking to a reliable manufacturer. The good news is many manufacturers do take orders for smaller numbers and prototyping, so if you need certain plastic parts that are expected to perform and have great strength, this is the technique to go for. Of course, the costs must be considered, more so because the time required for production can be a tad higher with this form of plastic molding.