Plastic rotational molding is a thermoplastic fabrication technique that manufactures hollow products by using heat and a revolving metal mold. Rotomolded products are seamless, uniform in wall thickness and of single construction, which eliminates costly fabrication processes and the need for replacement parts.
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MOD Custom RotomoldingAshtabula, OH 800-772-7659 For plastic rotational molding, turn to MOD Custom Rotomolding. The friendly customer service and expert manufacturing staff are skilled at creating the high quality, custom product you need. With manufacturing facilities around the United States, they are able to provide fast, efficient product distribution at the lowest freight cost possible throughout the country and the world.
Quality Industries, LLCHartwell, GA 800-241-8044 For almost fifty years, Quality Industries has been a manufacturer of plastic rotational molding products. A family run business that values their skilled employees for their dedication and years of knowledge, they have the experience and talent needed to make the precise products you have been looking for. For all needs, be sure to contact Quality so they can get started assisting you!
Dakota MoldingFargo, ND 701-281-0001 Dakota Molding has been in the plastic rotational molding business since 1996, and is one of the largest companies for this process in the Midwest. They specialize in both short-run and volume production using linear low density polyethylene, high density cross-linked polyethylene and nylon six plastic resins. For the precise product to meet all your requirements, call Dakota.
Roto Dynamics Inc.Anaheim, CA 714-630-6399 Roto Dynamics, custom rotational molders serving rotomolding needs nationwide. Our team is dedicated to our customers' rotational molding requirements; we do not manufacture our own proprietary products. Long term customer relationships help us develop a competitive advantage. We produce quality parts at competitive prices; offer stocking options, secondary ops assemblies and short lead times.
Assmann Corporation of AmericaGarrett, IN Marshall, TX - 888-357-3181 Assmann Corporation is an NSF & ISO certified rotational molder of large and small double wall, vertical, horizontal and conical plastic tanks, and also chemical feed stations plus secondary containment basins. Our rotomolding process and extensive experience makes the difference... We offer many accessories, including full drain outlet, seismic restraints and more.
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While the most common thermoplastic material used for plastic rotational molding is polyethylene, other materials include polypropylene, polyvinylidene fluoride, nylon and polyvinyl chloride. These plastics are exposed to high heat and therefore must exhibit good thermal stability. To enhance properties like flame retardancy, water and chemical resistance as well as the ability to withstand extreme temperatures, many resin powders contain additives, which can also alter the color, texture, finish and appearance of the cured plastic's surface. Plastic rotational molding is an alternative to blow molding, injection molding and thermoforming, but is not as common because of the large, expensive machinery that is used to form the products. Still, this molding process is used within the sporting goods, waste water management, marine, pharmaceutical, construction, toy manufacturing, food and beverage processing, chemical, plumbing, agricultural, furniture, packaging and material handling industries, among others. Rotomolded products include safety cones, plastic tanks, footballs, helmets, kayaks, playground slides, pipe fittings and outdoor planters.
The plastic rotational molding process starts with mold fabrication via welding, for simpler designs, or die casting, for more complex constructions. The molds are made of stainless steel, aluminum or a combination of both, when wall thickness is not intended to be uniform. The plastic rotational molding machine is composed of a series of different molds, which are mounted on rotating spindles, which revolve on one or two axes. The polymer resin powder, which must be very fine in order to coat all areas of the mold, is then poured. The plastic rotational molding machines are then transported to an oven chamber while they continuously revolve. Once under high heat, the powder melts and evenly covers the mold walls. Next, it travels to a cooling chamber, which uses a combination of cold water and air to cure the plastic. This takes about 20 minutes. Once the plastic has fully dried, the molds are manually unloaded, which can be difficult if the plastic shrinks. Right out of the mold, rotomoulded products are hollow parts without any openings or holes; they must be cut out if needed. The plastic is often cleaned, polished, painted or welded with small components as final post-forming fabrications.
