the raw material used for rotation moulding is generally in a powder form. the only exception to this is PVC which is in a liquid form. the raw material is dispensed into the tool when open
the tool is then close and the rotation begins in the oven. the tool is rotated on 2 axis simultaneously at a ratio of 1:4. this rotation ensures that the the material washes around the inside of the tool.
when the tool achieves optimum temperature the material begins to sinter to the inside of the wall and then develop wall thickness. the temperature of the over will get to around 270 degrees C.
once the melt cycle is complete and the powder has been transformed to a cohesive skin on the inside of the tool the cooling cycle begins.
the tool continues to rotate throughout the cooling cycle. the cooling effect achieved through forcing air onto the outside tool surface. at the end of the cooling cycle the rotation is stopped and the tool can be demoulded.
the mould is allowed to cool prior to any secondary operation.