Rotomolded products are seamless, single piece plastic parts that are thin-walled and hollow. They are made from lightweight thermoplastics like polyurethane, polypropylene, nylon and polyvinyl chloride that form aluminum or steel molds to fabricate many different shapes. Rotational molded plastics are subjected to high heat and therefore must exhibit good thermal stability.
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MOD Custom RotomoldingAshtabula, OH 800-772-7659 At MOD Custom Rotomolding, in addition to their molding and custom design engineering services, the company also offers a host of ancillary in-house services. These include a state-of-the-art powder coating operation, metal fabrication and cut and sew options. For all your needs, including rotomolded products, be sure to contact MOD today to get started.
Quality Industries, LLCHartwell, GA 800-241-8044 Since they began almost fifty years ago, Quality Industries has been a quality manufacturer and distributor of rotomolded products. They combine their staff's experience along with an aggressive attitude toward investing in new technology and continual staff training on current manufacturing ideas. For the products you need, contact Quality today!
Dakota MoldingFargo, ND 701-281-0001 Operating out of their state-of-the-art facility, Dakota Molding provides products, including rotomolded products, which are well suited for industrial, recreational, merchandising, safety and home use. These products provide many advantages, including economically produced large products, minimum design constraints, very low residual stresses and no polymer weld lines.
Roto Dynamics Inc.Anaheim, CA 714-630-6399 Roto Dynamics Inc. is committed to meeting the requirement of its customers by continually producing quality parts at competitive prices. We produce an array of rotomolded products for various industries ranging from, material storage units, automotive accessories, fluid treatment systems and water tanks. Our team is dedicated to providing high quality rotational molding products to our customers.
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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Rotomolded products require no assembly and have even, smooth walls every time. Rotational moulding is an inexpensive process that fabricates high quality and durable products, but works slowly in small runs. Rotomolded products are found in many different industries, including the sporting goods, marine, materials handling, packaging, office, school, recreation, toy manufacturing, medical, construction, plumbing, agricultural, automotive, promotional/display, road safety and furniture industries. Many different containers are rotomolded, including plastic tanks, cases, packaging containers, bins and trash cans. Other products include doll parts, lawn ornaments, road cones, kayaks, playground slides, outdoor chairs, footballs, sleds, pipe fittings, hoppers and plastic planters. These products are usually medium to medium-large in size, but cannot exceed 20 feet because of machinery constraints. They are sometimes multi-wall, often hollow, and the resin can contain additives for moisture protection, flame retardancy, static elimination, color and texture.
The rotational molding process is simple, but requires huge, expensive machinery that uses lots of space and needs a fully insulated walk-in oven. Specialty or stock molds are fabricated by welding or die casting and then attached to a massive, round revolver that spins and revolves on two axes simultaneously. Fine grain plastic resin powder is dumped inside the mold, which is then closed. Multiple products may be formed at one time, regardless of their shape or size difference. Each machine has two to four revolvers that hold molds. The revolvers are either enclosed in an oven or travel to a heated environment, where the process begins. They operate slowly under low pressure and high heat. Inside the molds, the plastic powder becomes molten and smoothly and evenly coats the interior walls. They are then transferred to a cooling station, where they continue to rotate and are exposed to cold water and air for about 20 minutes in order to cure. Next, the newly formed product is manually removed from the mold, which can be a difficult process. Some products need further finishing, like welding, where parts are attached, or cutting, to add openings and holes. After the plastic has been cleaned and polished, it is ready to be shipped.
