Rotational Moulding Process | Introduction In the past, it was not widely commercially used compared to other plastic processes as it is considered a slow process. However, new material, substantial development in the process technology, mould making methods and production equipments have contributed to its expansion of the limit beyond those known for traditional applications Certain restrictions and limitations on the blow moulding and injection moulding make them uneconomical to produce large, thick walled and complex parts. Rotational moulding process is unique as compared to the latter processes as all essential subsequent steps such as melting, shaping and solidification take place without any shear force in the mould. Process Overview The process also has a number of inherent design strength, 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. Inserts, threads, handles, minor undercuts, flat surfaces that eliminate draft angles or fine surface detail can be part of the design. Rotational moulded parts can have the option of multi-wall moulding that can be either hollow or foam filled. Rotational moulding can easily produce large and small parts in a cost effective manner. Tooling is less expensive because there is no internal core to manufacture and minor changes can be easily made to an existing mould. Product costs for product conversion are reduced because lightweight plastics replace heavier, often more costly materials. These makes rotational moulding are cost effective for prototype part as it is for large production runs. |
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