Ulla Wally March 12, 2018

Rotational Molding is a thermoplastic method for producing hollow plastic goods and components. It is an extraordinarily techno scientific and unique plastic product production method. In this method, resin is set in a vacant mold, and the frame is rotated until the resin softens and covers the inner wall of the mold. Next, the apparatus is cooled, and the component is withdrawn from the frame.

Rotational Molding Process

There are many excellent plastic manufacturing processes that help in the development of highly precise finished products. However, every process has its limits. Rotational Molding is a specific technique that is practiced to form hollow plastic goods with high precision. In this method, heat melts and fuses the plastic resin in a sealed mold. Unlike other manufacturing processes, no pressure is involved while developing a new product.

Mainly, the Plastic Rotational Molding can be classified into four different stages:-

  • Loading the resin in the mold
  • Heating and fusing the resin
  • Cooling
  • Finally extracting the product from the mold

Once the powered or liquid resin is placed in the frame, the charged frame is positioned into an oven and rotated upon a rotating two axis arm at a slow speed. The mold containing resin is heated, and the resin sticks to the frame’s internal wall until it is fully fused. The mold is then cooled with the help of a water spray or air or a mixture of both while rotating. This is to guarantee a slow drop in the temperature. After cooling, the mold is opened, the finished component is removed, and the mold is again filled with more resin for the next manufacturing cycle.

With the development of the production technology, a vast variety of substances such polyurethane, and elastomers are used to manufacture plastic components with rotational molding. It is one of the most cost-effective plastic goods manufacturing processes. Products and parts can be made in a vast variety of sizes and shapes that would be impossible to produce by any other method.

Advantages of Rotational Molding

There are many manufacturing methods; however, Rotational Molding offers a unique set of benefits. Rotational molding is a plastic product production process that is used to develop highly enduring and long-lasting plastic products and parts. This production process gives the freedom to use the raw element of your choice. However, polyethylene is the most popular material. Ease of use is another benefit of this process. This method requires a mold, which can be built using different methods such as, casting, machining or fabricating a frame. If you are interested in rotational molding, you can click here to learn more.