Rotomoulding is a method of manufacturing plastic products for today's market place. Rotational Moulding has the creativity, the productivity, the quality, the simplicity, the professional standards you're looking for in product design and production.

The Process

The rotational moulding process starts with a good quality mould that is placed in a moulding machine that has a loading, heating, and cooling area. Several moulds may be placed on the machine at the same time. Pre-measured plastic resin is loaded into each mould, and then the moulds are moved into the oven where they are slowly rotated on both the vertical and horizontal axis.

The melting resin sticks to the hot mould and coats every surface evenly. The mould continues to rotate during the cooling cycle so the parts retain an even wall thickness. Once the parts are cooled, they are released from the mould. The rotational speed, heating and cooling times are all controlled throughout the process.

Design Advantages

Rotational moulding offers design advantages over other moulding processes. With proper design, parts that are assembled from several pieces can be moulded as one part, eliminating expensive fabrication costs.

The process also has a number of inherent design strengths, such as consistent wall thickness and strong outside corners that are virtually stress free. If additional strength is required, reinforcing ribs can be designed into the part. Rotational moulding delivers the product the designer envisions. Designers can select the best material for their application, including food-grade materials.

Additives to help make the part weather resistant, flame retardant, or static free can be specified. Inserts, threads, handles, minor undercuts, flat surfaces that eliminate draft angles or fine surface detail can all be part of the design. Designers also have the option of multi-wall moulding that can be either hollow or foam filled.

Cost Advantages

When cost is a factor, rotational moulding has the advantage over other types of processes as well. In comparison to injection and blow moulding, rotational moulding can easily produce large and small parts in a cost effective manner. Tooling is less expensive because there's no internal core to manufacture. Since there is no internal core, minor changes can be easily made to an existing mould.

And because parts are formed with heat and rotation, rather than pressure, moulds don't need to be engineered to withstand the high pressure of injection moulding.

Production costs for product conversions are reduced because lightweight plastics replace heavier, often more costly materials. Which makes rotational moulding as cost effective for one-of-a-kind prototypes as it is for large production runs.

Design and development based on our 30 years of rotational moulding experience

1) Resin is loaded into a custom constructed mould.

2) The charged mould is loaded into an oven and generally rotated on two axes at low speed, creating a tumbling action. As the heat penetrates the mould, the resin adheres to the mould's inner surface until it is completely fused.

3) The complete part is ready for cooling.

Rotational Moulding is a plastics moulding process for making simple and complex shapes ranging from components weighing less than 1kg to large vessels holding several tonnes. We have been leading rotomoulders since 1966 and hold the highest attainable quality rating for design and manufacture.

PD Rotomouldings , Maes Y Clawdd Ind. Est., Maesbury Road, Oswestry, Shropshire SY10 8NN, United Kingdom

Tel: +44 (0)1691 659905 Fax: +44 (0)1691 659344
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