Rotational Moulding

In rotational molding, the plastic raw material placed in the mold as powder is rotated in the oven to take the shape of the mold. After the oven, the rotation process continues until the mold is cooled to a certain temperature. It is also called roto-moulding. It is more advantageous than other production technologies in the production of large size, low and medium quantity plastic parts. Many plastic parts of heavy vehicles, commercial vehicles, construction machines, agricultural machines, tractors, special purpose vehicles are produced by rotational molding. Fuel and urea tanks, wiper water tanks, hydraulic oil tanks, air ducts, resonance boxes, fenders, cabin roofs are the best examples.

Although the production speed is slow and limited raw materials are used, it has been preferred in many different areas due to the developments in rotational molding and material technology. It can compete with other molding methods in the production of complex shaped hollow parts. It has become a common method as a result of the realization by designers that large-volume parts with complex shapes can be produced in one piece, without tension stress accumulation and cheaper with rotation molding. For many sectors, high quality plastic products from different raw materials are produced by rotational molding at competitive costs.

The Advantages of Rotational Moulding

  • Mold and investment costs are low.
  • Mold production time is short.
  • It is suitable for complex shaped products that cannot be made in other technologies.
  • Production can be made with many engineering plastics.
  • Double-walled products can be produced by adding filler (foam, etc.).
  • During the molding process, detailed pieces can be combined with the part. (Insert, flange etc.)
  • Production can be made in different colors.
  • Double colors are possible at the same time.
  • Hollow parts can be produced without welding and in one piece.
  • Since it is a non-pressure production method, no tension occurs on the product.
  • Easy to apply changes on the mold.

The Disadvantages of Rotational Moulding

  • The production speed is slow (approximately 5.000 pieces of production per year with one mold).
  • Tolerance class is wider than injection moulding.
  • Plastic raw material must be produced specially for rotation.

About Rotational Moulding