by Multi7Adm Multi7Adm

Rotational Molding main differences and advantages over other techniques

Rotational Molding main differences and advantages over other techniques. Rotomoldin offers great advantages when compared to other techniques.

The main differences between Rotational Molding and other plastics production techniques such as blow molding or injection molding machines are the following:

• powdered material instead of granules is used
• material melts in the molds rather than being molded under pressure in molds in melting mode.
• the die has biaxial rotation.
• molds are considerably more economical than other molds, e.g. injection molds due to their simplicity
• operating pressures are relatively low, allowing molds to be made of less expensive materials.
• wall thickness is controlled by the amount of powder placed in the mold.
• uniformity of the wall thickness can be maintained within ± 10 percent, which is better than what is usually feasible with the blow molding process.

Advantages of Rotational Molding

• the costs for molds and tools are relatively low.
• The rotomolding technique easily adapts to the production of many different products
• hollow, completely enclosed objects as well as open-ended pieces can easily be produced
• there is little or no waste.
• Wall thickness and piece weight can be easily controlled.
• uniform wall thickness.
• Deviations can be controlled within a maximum tolerance of ± 10 percent.
• Pieces with complex shapes and embossed patterns (eg logo, motif, etc.)
• Any size of a track can be easily created
• there is little or no shrinkage or distortion.
• Excellent surface detail and finish.
• Similar objects or different parts of a product or in different colors are produced simultaneously.
• Plastic or metal inserts may already be embedded as an integral part of the manufactured article
• double wall constructions, color mixing and special effects creation are feasible.