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Rotational molding, also known as rotomolding, is a thermoplastic molding process best suited for large, one-piece hollow parts and double-walled open containers such as tanks, kayaks, and coolers. It’s most cost-effective for production volumes of less than 3,000 annually, making it ideal for inventors, start-ups, and small businesses.http://www.rotomoldingchina.co....m/rotomolding-machin