What is Rotomoulding?
Rotational plastic molding is an extremely versatile and economic process that relies on gravity and heat to produce parts with exceptional strength. The finished result is a stress-free, lightweight and seamless design that is very durable.
A variety of plastic resins are available to use, depending upon the product specifications, strength requirements and resistance to other substances required. Materials that may be selected include polyethylene, nylon, polycarbonate, polypropylene, polyvinylchloride (PVC) and custom formulated compounds,
The flexibility of RDP’s process allows for a wide range of shapes and sizes to be manufactured. RDP also offers products in a wide range of colors, with graphics molded directly into the part.
Steps in the rotational molding process:
- After the type of resin is selected, a premeasured amount of plastic resin is placed into a mold.
- The resin melts and fuses in a three-stage process. After the resin is loaded into a mold, the mold is inserted into an oven and rotated on two axes at low speed until the resin coats the inside surface of the mold cavity, fusing into a uniform wall thickness.
- While still rotating, the mold is removed from the oven and is cooled gradually.
- The rotation ends when it reaches the temperature that the part can be safely removed from the mold.