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. Rotationally molded plastics are subjected to high heat and therefore must exhibit good thermal stability.
Quick links to Rotomolded Products Information
Applications of Rotomolded Products
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.
Industries Using Rotomolded Products
Rotomolded products are found in many different industries, including:
- Sporting Goods
- Materials Handling
- Toy Manufacturing
- Road Safety
- Furniture Industries
Examples of Rotomolded Products
Many different containers are rotomolded, including:
Other products include:
- Doll Parts
- Lawn Ornaments
- Road Cones
- Playground Slides
- Outdoor Chairs
- Pipe Fittings
- 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.
Rotational Molding Process
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, such as:
- Welding, where parts are attached.
- Cutting to add openings and holes.
- After the plastic has been cleaned and polished, it is ready to be shipped.