Rotational Molding Specializations and Embellishments
It’s easy to grasp how the rotomolding process works. An open casting is made, plastic is inserted, the casting is closed, the plastic is melted, the casting is rotated, the plastic forms around the contours of the casting, the plastic cools, the casting is opened, the product is finished. Simple, right? Well, maybe. Goodness knows if someone told me, “Make a rotomolding casting!” I wouldn’t know where or how to start. But I don’t want to talk about the actual molding part of rotomolding in this post. I want to talk about how all of those specializations – the imprinting of text, texturing, dimpling and other surface embellishments – come into being during the rotational molding process.
There are a lot of ways to impart the surfaces of rotationally molded products with specializations. Take, for example, a customer who is making the switch from metal assemblies to plastic ones. This customer specializes in the distribution of fuel tanks, and the customer wants their new plastic tanks to feature permanent raised warning labels that appear on the surface of the tanks. In order for the warning label to be raised, the casting pattern would have to be designed with raised letters placed at the right spot. This is a piece of cake for any experienced casting engineer, and rotomolding, by virtue of its process, is well-suited to creating plastic products with raised surface lettering.
Suppose, in another example, that a customer wants a plastic part with a bumpy surface. In that case, the original casting could be shot peened with steel bearings. There’s virtually no limit to the number of variations and embellishments that can be imparted to a rotational molding casting, which means that the rotational molding process offers customers a large variety of design possibilities.