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REQUIREMENTS FOR CORNER ANGLES In addition to the space needed between parallel walls, corner angles must also be designed to ensure even wall thickness throughout an irregularly shaped part. Corners measuring 90 degrees or more require no special treatment. Anything under 90 degrees will require special attention and a closer look at the materials used for the process. Harder flow materials such as polycarbonate should not be used in a part requiring angles less than 45 degrees. DRAFT ANGLES FOR EASY REMOVAL Draft angles are tapers applied to the part making removal from the cavity easier. Draft angles reduce the force placed on a part during the removal and, therefore, minimizing cool- ing time, cost, induced stress, and part warpage. One advan- tage that rotational molding has over other molding forms is that many parts can be manufactured successfully without using draft angles. As the part cools, it shrinks away from the mold, making it easy to remove. There are no specific rules for determining the use of draft angles. Certain materials such as polyethylene are used for softer pieces and can be removed without difficulty. However, the designer must take in consideration the materials used, shape of the part, and inside shrinking of the piece during the cooling process. When it does not interfere with the design, draft angles should be used liberally to ensure easy removal. Sterling Technologies | 10047 Keystone Drive • Lake City, PA 16423 | 814.774.2500 | SterlingRotationalMolding.comPDF Image | GUIDE TO PLASTIC ROTATIONAL MOLDING
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