About Rotomolding

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Rotomolding, or rotational molding, is also called spin-casting or roto-casting and is a process for molding many types of hollow-centered items made out of plastic.

Rotomolding Plastic Process

Rotational Molding Process – Courtesy Laurens VanLieshout

Step 1: Load the mold

Empty or hollow molds are filled with the desired resin material and loaded onto a large device called a spider.

Step 2: Heat the mold

The molds are then rotated slowly in a large oven, allowing the material to be dispersed and softened until it is forced out onto the mold surface to form the desired product.

Step 3: Cool the mold

After the material has been heated, it continues to spin on the spider through a cooling process, which helps to harden and set the plastic material.

Step 4: Unload the mold

Once the part has been properly cooled, operators at Elkhart Plastics facilities unload the mold. Depending on the product, the part will then move on to secondary finishing operations or the quality lab.

This process was first used in the 1950s and has since been perfected and enhanced over the years to allow for larger molds and many different types of materials for various specific applications.

Elkhart Plastics, Inc. has been working in the rotomolding industry for more than 25 years and has the experience and knowledge to make any unique part using this rotomolding process. Our facilities in Middlebury, Elkhart, South Bend, Littleton, and Ridgefield, use the most advanced rotation molding equipment in the industry. By employing an independent arm carousel, we can produce custom plastic parts in an endless variety of shapes and thickness.

Contact Elkhart Plastics, Inc. today for a consultation. We’ll talk about what we can do for you.