There are many structural advantages of rotational molding over processes like injection molding. Although the machines can handle these very large parts, they can also take parts that are much smaller in scale that can be excellent candidates for the job as well. Since these parts are smaller, several molds can be completed at the same time if a company has multiple molds.
Rotational molding is made by taking a pulverized type of thermoplastic and placing it inside a mold that is mounted on a rotating machine. This machine rotates the mold on the horizontal and vertical axis. It is then heated to melt down the resin. This will help to evenly distribute the resin over the surfaces of the mold. When the cycle is completed, the mold is cooled down and will then show a cured and rigid part. The finishing and trimming work can then begin. The rotational molding can then be conformed into a single piece, rather than taking several parts and putting them together separately. This benefit helps to reduce tooling and machine costs, as well as finishing and fabrication labor costs.
When looking to source a job out to a rotational molding company, there are several factors that need to be considered. First, can the manufacturing company complete the process in the way you demand? Second, can they work with tight timeframes with reliable distributors? Third, what type of insurance do they offer the customer that the job will be completed adequately?