The concept of Rotational Molding is very simple. 

• Powdered resin is placed in a sealed metal mold. 
• The mold is attached to a machine that rotates the mold in two directions (two axis). 
• The mold is moved into an oven where it heats up while continuing to rotate. 
• After heating long enough for the plastic to melt, the entire inside of the mold will be covered with molten plastic. 
• The mold is removed from the oven for a cooling cycle which may involve the use of fans or water mist while the mold continues to rotate on 2 axis. 
• Once the mold and plastic have sufficiently cooled, the mold is opened and the part is removed. 
• The one-piece molded part will be in the shape of the mold and the wall thickness of the part will be generally consistent.  
• There will be more thickness in the outside corners of the item giving it more stength and durability. 
• The plastic will be formed stress free.