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Bi Axial Moving Type |
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Bi-Axial Rotomoulding Machine |
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The process offers following lucrative benfits. |
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Low Investment in project compared to other plastics projects. |
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Easy and operator friendly process. |
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Low tooling costs. |
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Development of new products is faster and economical. |
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Mfg of Sheet metal moulds is faster and cheaper. |
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Uniform wall thickness of products. |
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Comparatively low skilled staff and operators required. |
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Easy and practically feasible for insertion of metal parts |
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Offers great business potential in many untapped segments |
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Great possibilities to develop products in newer application. |
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Stress free products as no plastics melt or pressure involved. |
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Most suitable for hollow and large volume articles. |
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Economical process for short run and R &D purpose. |
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Raw material for Rotational Molding |
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LLDPE ( Liner Low density Polyethelene) is being used with density of 0.930 to 0.936 gms/ Cm cube and Melt Flow Index in the range of 3 to 6 gm per 10 minutes. To produce the good quality water tanks by Rotational Molding, the material should have following properties. |
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Good mechanical strength. |
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Good material stability over a wide range of temperature and cycle time. |
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Good resistance over warpage. |
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Consistency in Shrankage at least 2.5 % or slightly more. |
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High ESCR ( Environmental stress crack resistance ). |
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Other Ingredients |
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The original LLDPE granules are of natural colour which have to be converted in to either black, white, blue or other colours as per requirement of final product. To produce the coloured granules , basic LLDPE granules have to be mixed with colour concentrate which are called as master batches.
These master batches are readily available in market which are to be added alongwith LLDPE.The master batch should be of grade which is LD based. The master batch with antioxidants are more preferred. Anti oxidants protects the material from oxidation during the molding process which helps to avoid the pin holes on surface of finished product.
Incase of black master batch, carbon contents are very important. Carbon contents act as UV stabilizer. It helps to improve the life of tanks if tanks are exposed to sunlight for longer period and to avoid the crack on tanks.Some other common additives like flame retardants, anti static agents, foaming agents, are also used as per requirements.
A three-arm turret machine is generally used in applications where the oven (1), cooling (2), and servicing (3), cycles for the parts on each arm require relatively equal process time. Four-arm turret machines are used where one part of the process (heating, cooling or servicing) requires up to twice as much time as the other functions. |
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