Rotational molding may surely be beneficial for creating benefits, but it is not the best process for manufacturing every part. You need to determine according to your requirements, if this process is right for you or not. You need to understand its pros and cons as well. Rotational molding or rotomolding is a thermoplastic molding process which is ideal to make large, one piece hollow parts and double walled open containers like kayaks, tanks, and coolers. It is also the most cost effective process. This process comes in handy for making parts that need high quality finishes, even wall thickness and high stability. You can include features like inserts and spin weld attachment from the rotomold. Foaming can be done to make thermal insulation and stiffness.
- The powdered plastic resin is added to the hollow mold.
- Then the mold is rotated biaxally into the oven.
- As it rotates, it begins to melt and coats the mold walls.
- The mold cools down and the resin hardens into a shape.
- Then the rotation is halted, mold is opened for getting the finished part.
Rotomold tooling is made of low pressure and needs high heat and can be made from a soft metal like aluminum. Click here to know more.
- Low cost tooling
The low operating pressures let the rotomold tooling to be made from low cost materials like aluminum.
- Even wall thickness
The consistent rotation of the mold coats the walls in the ongoing heating and cooling processes. Low-cost tooling: low operating pressures allow rotomold tooling to be crafted from low-cost metals such as aluminum
- Double wall construction
You can also manufacture double walled open containers with no kind of secondary processing.
- High durability
The parts are molded as a single solid piece that removes the requirement for the joining techniques like welding and joint fabrication which causes weak spots.
- High stability
As the material isn’t exposed to external pressure, it makes the material stable and keeps the defects away.
- High cycle times
This process takes around 8 rotations per minute and around 3 hours to complete a single part.
- Limited material options
The raw material being used for rotomolding must be transformed from granules to a fine powder and must bear high thermal stability and has limited material options.
- High cost of raw material
This is because the materials have high thermal stability, cost of the additives, and cost to grind the material into powder.