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About Rotomoulding |
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In plastic Industries three main processes were known to the industries (1) Extrusion (2) Blow Moulding (3) Injection Moulding. In all these processes the main draw back is the tooling or die cost of the equipment against the single piece weight of the product. For the large Hollow component the Rotational Moulding is most economical process. The basic advantages of the process are as below.
• Economic tooling costs, • One-piece construction, • Weight reduction as compared to most metals, • Uniform wall thickness • Variety of finishes and colours, • The ability to produce multi-wall Mouldings, • Metal inserts as integral parts. • Minor undercuts are possible with no draft angle required, • Short lead-time, • Products from this process can offer excellent load-bearing properties and resistance to stress cracking and corrosion. |
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Applications |
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Agricultural |
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• Spray Tanks • Horse troughs Grain Storage Hoppers • Feed Crates |
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Industrial |
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• Chemical Storage • Textiles Trolleys • Ducting • Material Handling • Food Processing • Pharmaceutical / Chemical |
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Safety And Constructional |
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• Road barriers • Septic tanks • Construction toilets • Traffic signals • Workmen's huts |
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Domestic |
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• Drinking Water Storage Tank • Rain water Storage • Slim line Tank • Office Waste Containers • Furniture • Planters • Playground Equipment • Toys • Wheel Barrows •i Dog kennels • Light Globes *Cabins |
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Process |
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Basically, the rotational Moulding process contains Three steps:
Rotational moulding,also called Roto casting or Roto moulding is a unique process because the heating shaping and cooling of the process take place inside a mould with no application of pressure. The process is being carried out at the ambient pressure, which leads the products to withstand environmental stress and crack resistance quality during use.
• A predetermined quantity of blended polyethylene resin powder is placed inside a cold mould (usually of aluminum or steel sheet metal]
• The mould is then rotated (bi axial) and gradually heated inside the oven as the metal mould gets heated the polymer resin powder melts and the molten resin eventually distributed (Coated) along the inner surface of the mould when all the powder has melted and distributed, the mould is transferred to a cooling chamber keeping the moulds in rotating.
• The bi axial rotation is continued until the cooling process is finished and the polyethylene has solidified. The mould is then opened and the finished product is removed. |
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