Rotational Molding - 旋转成型

Rotational MoldingRotational molding, also known as rotomolding, is a manufacturing process that involves heating a hollow mold and introducing a measured amount of powdered or liquid plastic resin into it. The mold is then rotated continuously around multiple axes, causing the resin to uniformly coat the interior walls of the mold as it melts.Process Steps1. Mold Preparation: The mold is typically made of metal, usually aluminum, and designed in the shape of the desired product. It consists of two halves that are clamped together.2. Loading Resin: The appropriate amount of plastic resin, such as polyethylene (PE), polypropylene (PP), or polyvinyl chloride (PVC), is placed into the mold cavity.3. Heating and Rotation: The mold is heated in an oven or using other heating methods to a temperature where the resin melts. As the mold rotates, the molten resin evenly coats the inner surface of the mold.4. Cooling: Once the resin has cooled and solidified, the mold is opened, and the finished product is removed.Advantages- Complex Shapes: Can produce products with intricate and complex geometries, including those with internal features.- Seamless Construction: Results in seamless products, eliminating weak points associated with seams.- Low Tooling Costs: Compared to some other molding processes, the tooling for rotational molding is relatively inexpensive.- Material Savings: Due to the nature of the process, less material is typically wasted.ApplicationsRotational molding is widely used in various industries. Some common applications include:- Consumer Products: Toys, storage containers, coolers, and furniture components.- Automotive Parts: Interior and exterior trim pieces, fuel tanks, and air ducts.- Marine Equipment: Boat hulls, fenders, and buoyancy aids.- Industrial Equipment: Chemical tanks, bins, and protective enclosures.