Rotomoulding machines come in two basic configurations: biaxial and rock & roll. Each configuration has its own benefits and draw-backs. I have designed and built both types in the past, so now that I need a new machine for my company, I had to think carefully which type of machine I want to build this time.
For most rotomoulding companies, quick moulding cycles and fast turnaround time between cycles is of the highest priority, making biaxial machines the first choice for the vast majority of applications. To be frank, for most rotomoulded products that approach works perfectly fine. On the contrary, I specialise in the rotomoulding of complex products that routinely require multi-segment moulds, a variety of moulded inserts, moulded-in graphics and also negative draft angles, while at the same time having critical specs regarding wall thicknesses that may vary between different parts of the product.
Having substantial experience with both types of machines, I feel that I can control the process better with a rock & roll machine. I’m happy to compromise on the speed of the moulding cycles if I can get a better quality product, consistently. I am not interested in making products that become consumables. I prefer to make products that last.
Below are screenshots of the CAD design for my new machine. The completed machine will naturally have more things added than what the CAD design shows, such as the cladding and insulation on the oven shell, the rotating components, electrical wiring, gas and pneumatic pipes, control panel, etc. But when I design a machine that I build for in-house use, I rarely add these final details in the CAD phase. I’m pretty hands-on with the building of my machines, so those details are perfectly stored in my head until my crew gets to that point in the building process.
I’ll post some pics of the completed machine in a few weeks’ time.