A Rotomolding Company
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When you consider to custom rotomolding, product design under rotational plastic molding technology shows strong flexibility, such as being suitable for the production of large, complex-shaped hollow items. Injection molding technology cannot handle large hollow objects flexibly.
Rotomolding molds are usually made of aluminum and are less expensive than injection molding steel molds. This makes roto molding more cost-effective when producing small batches. Injection molding molds are usually made of hard steel, and for complex product designs, mold costs can be very high. This can significantly increase the cost per unit of product when producing small batches.
Rotary molding has a longer production cycle, especially the heating and cooling processes that are time-consuming. Injection molding has a short production cycle and is especially suitable for mass production.
Rotational molding mainly uses polyethylene (PE) and polypropylene (PP), such as the well-known polyethylene rotational molding technology. But the material options are not as rich as injection molding. Injection molding can use a variety of plastic materials, including but not limited to ABS, polycarbonate (PC), polyethylene (PE), etc.
Consistent wall thickness, even a bit thicker at the corner, free stress in forming, plus double wall design and kiss-off design, makes the rotomolded product very stable, in high strength, with high impact resistance compared with other processes, so very durable in application with good life time.
As one of the advantages of rotational molding, a low operating press means not much strength request on the tooling but a good heat transfer rate, so cheap metal like sheet metal and CNC aluminum(from extruded block or cast shape) is used a lot, and only one side of the tooling needs to be precisely shaped. All these make the roto-molded plastic products cost the lowest compared with other plastic processes.
Except for the main parting line demolding, sliding blocks can be handled in any direction as needed, which will make shape/feature design quite flexible, and easily adapt innovative/creative shape design. The rotomold tool uses soft metal, easy for surface finish features like texture, logos, symbols, and letters.
As a good replacement for metals, concrete, and fiberglass, also different from other plastic processes, roto-molding has very little material waste and no chemicals or dangerous toxins in the manufacturing process. And also plastic is 100% recyclable, therefore products made by rotational moulding reduce the impact on the environment greatly in both manufacturing and applications.
