Plastipedia HomeHistory of PlasticsA-Z AdditivesAnti Counterfeiting Antimicrobials / BiostabilisersFragrances A-Z ProcessesBlending and DosingBlown FilmDrying of PolymerExtrusion Blow MouldingExtrusion Profiles and SheetInjection Blow MouldingInjection Moulded (Gas Assisted)Injection MouldingInjection Stretch Blow MouldingMoulding Expanded Polystyrene (EPS)Rotational MouldingStructural FoamThermoformingVacuum Forming Polymer: Thermoplastics(ABS)Aramids PI Aromatic PolymideCellulosics CA, CAB, CAP, CNEthylene Vinyl Acetate EVAExpanded Polypropylene (EPP)Fluoroplastics PTFE FEPNylons (Polyamides) PAPEEK (tm)Polyacetals POMPolybutene-1 (PB-1)Polycarbonate PCPolyesters PETP, PBT, PETPolyethylene (High Density) HDPEPolyethylene (Low Density) LDPE, LLDPEPolymethylpentene PMPPolyphenylene Oxide PPOPolyphenylene Sulphide PPSPolypropylene PPPolystyrene (High Impact) HIPSPolyvinyl Chloride PVCStyrene Acrylonitrile (SAN) & Acrylonitrile Styrene Acrylate (AS Polymers: ThermosetsAlkyds AMCAllylics DAP, DAIP, ADCEpoxies EPFuranMelamines/Ure (Aminos) MF, UFPhenolics PFPolyurethane cast elastomers (EP)Unsaturated Polyester UPVinyl Esters Polymer: Bio-Based/DegradablesBio-based plastics: Feedstocks, Production and the UK MarketCase Study: Compostable Bags for Organic Waste CollectionPackaging waste directive and standards for compostability Testing TechniquesImpact Testing - Drop TowerImpact Testing - PendulumMechanical TestingMelt Flow TestingRheologySample PreparationThermal Testing Applications (Plastics in Use)About Plastics PackagingConstructionPlastics in Electrical and Electronic ApplicationsTransport Polymer PricesRecycling & SustainabilityEnergyStandardsBPF Literature & Guides Join the BPF Related CategoriesPlastipedia Rotational Moulding Overview Rotational moulding (often referred to as Rotamoulding or Rotomoulding) is a process used for producing hollow plastic products. By using additional post-moulding operations, complex components can be produced enabling the process to compete effectively with other moulding and extrusion practices. From 13 - 15 September 2015 the BPF will be hosting ARMO2015, an international Rotational Moulding Conference at Nottingham Conference Centre. To find out more and book your place please visit the ARMO webpage Click Here To View Large Animation Overview Rotational moulding differs from other processing methods in that the heating, melting, shaping, and cooling stages all occur after the polymer is placed in the mould, therefore no external pressure is applied during forming. This provides the following advantages: Economically produced large products Minimum design constraints Stress-free products No polymer weld lines Comparatively low mould costs To visit the BPF Rotational Moulding page Click Here A range of Rotamoulded Tanks CLICK HERE FOR MORE EXAMPLES OF ROTAMOULDED PRODUCTS The Process The Rotational Moulding process is essentially split into four operations: Charging Mould A pre-determined amount of polymer powder is placed in the mould. With the powder loaded, the mould is closed, locked and loaded into the oven. The powder can be pre-compounded to the desired colour. Heating & Fusion Once inside the oven, the mould is rotated around two axis, tumbling the powder – the process is not a centrifugal one. The speed of rotation is relatively slow, less than 20 rev/min. The ovens are heated by convection, conduction and, in some cases, radiation. As the mould becomes hotter the powder begins to melt and stick to the inner walls of the mould. As the powder melts, it gradually builds up an even coating over the entire surface. Cooling When the melt has been consolidated to the desired level, the mould is cooled either by air, water or a combination of both. The polymer solidifies to the desired shape. Unloading/Demoulding When the polymer has cooled sufficiently to retain its shape and be easily handled, the mould is opened and the product removed. At this point powder can once again be placed in the mould and the cycle repeated. Typical Materials Used Polyethylene (Low Density) LDPE, LLDPE Polypropylene PP Ethylene Vinyl Acetate EVA Polyvinyl Chloride PVC Typical Products Produced Manhole inspection chambers Rainwater tanks Slides and climbing frames Diesel fuel tanks Childrens playhouses Traffic cones Canoes and kayaks Pallets CLICK HERE FOR MORE EXAMPLES OF ROTAMOULDED PRODUCTS Contact A Moulder The BPF Rotational Moulding Group represents and promotes the interests of all those involved in the rotational moulding process (also known as rotamoulding and rotomoulding) - these include small and large sized moulders, material suppliers, machinery manufacturers, ancillary equipment suppliers and service providers. The information you submit on this form will be sent directly to this group of companies and they will then contact you . Please fill out the form with as much information as possible as this will allow you to receive a timely response. If you have any queries about this service please contact Sara Cammarano: email@example.com or call 0207 457 5013 Fill out my online form. Contact: Tel: +44 (0)1224 859000 Email: firstname.lastname@example.org Web: www.balmoral-group.com We are grateful to Balmoral for their assistance in the preparation of this processes page.