Custom Rotational Molding
The rotational mold design, plastic material, additives, color and finishing processes, which include cutting, polishing, painting and welding, are all customizable options. Rotational molders cater to many different industries, including the food and beverage processing, pharmaceutical, agricultural, waste management, chemical, marine, sporting goods and storage industries. Common products include tanks, containers, bottles and boxes for industrial use. However, many other commercial products are fabricated by rotational moulding that are more likely to be custom made, like seating, toys, lawn ornaments, kayaks, playground equipment, musical instrument carrying cases and football helmets. They may be produced in high volumes or low runs as little as a single product. Rotationally molded products also have the option of surface texture, reinforcing beams, multi-wall construction, linings and inserts. The plastic powder can contain additives to enhance chemical resistance, prevent corrosion, protect against water damage and ensure flame retardancy.
The first step to design a custom made rotomolded product is to fabricate a unique mold. They are made from either stainless steel or aluminum. Since aluminum is a softer metal, their molds tend to be thicker than steel. They are either welded, for larger, simpler constructions, or die cast, for molds with a lot of detail. Often, the manufacturers are involved in the design, mold fabrication and finishing processes in addition to the actual plastic molding process. Finishing operations include cutting, which is required for any product with holes or openings, as well as painting, polishing, welding on smaller parts, coatings (usually polyurethane) that protect against corrosion and leaking and graphics or labeling. Many products made for the medical, food and beverage processing and pharmaceutical industries must be FDA approved and contain no dyes or recycled plastic, have a smooth surface and high temperature resistance. For enhanced aesthetics, the polymer resin powders can be custom made in any color, many different textures and finishes like stone or speckled effects. The option of inserts, threads, handles and fine surface details are also available.
