Rotomolding could make small product at the size of 10mm only and could make large product at meters like big chemical containers made by Rock N Roll machine, so offering great variety the sizes. However, rotomolding has much more advantage at big/large size of products rather than small for its labor and time consumption.
The quality of the finished products is affected by the mold design, process parameters as well as demoulding time, and cooling jigs etc. Resin quality also have big impact on quality in recent years as the heavy work of compounders in this industry.
Same with other plastic processes, it is quite crucial to customize the design at the earlier R&D stage by considering its application, mounting request and working environment etc. And The best to use rotomolding is the process offering more flexibility to the designers for its free stress forming process and allowing demoulding from any direction.
The unique features of rotomolding is free stress manufacturing, flexible/innovative/creative shape/appearance and low tooling investment, which is very good for startup project especially hollow articles.
Rotomolding is a hollow product making process by plastic powder melt and formed in a cavity mold heated when rotating at 360° degree. Each production cycle usually takes 45 minutes or so from resin poured into the mold to the formed plastic demolded.
PE(polyethylene) is the most used in rotomolding, incluing LLDPE, MDPE, HDPE and XLPE, PP(polyprepylene) and PA(nylon) can also be rotomolded. Other material like PTFE, ABS, PC are not so popular with also more limits for production.
Three options could be offered when this question asked. First is PVC casting(PVC powder needs be mixed into a sticky liquid before put into the mold) and PE casting(using powder directly), 2nd is classified by types of molds like metal fabrication, cast and machined, the 3rd is by types of machine i.e. shuttle machine, clamshell machines, vertical wheel machines, rock and roll machines, and turret machines. Recent years, new trials comes such as new electronic heating machine like using robot arm...
It is a perfect process for tank, containers, decorations, as well as functional bodys/shells like pet kennel, machine housings, and electronic box etc.
