By Energywise Consortium
Do you need to minimize strength intake whilst plastics processing? This ebook supplies accomplished assistance on powerful strength administration for organizations within the polymer processing undefined. This ebook is one in every of 3 which help the ENERGYWISE Plastics venture eLearning platform for eu plastics processors to extend their wisdom and figuring out of power administration. issues lined contain: o Injection Moulding o Extrusion o Rotational Moulding o Compression Moulding o Moulds and Tooling o different strategies the opposite books during this sequence are: useful advisor to power administration for Managers and sensible advisor to strength administration of amenities and Utilities.
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Extra info for A Practical Guide to Energy Management for Processors
1 Comparison of Heating Characteristics of Different Mould Materials . J. P. Kearns, Practical Guide to Rotational Moulding, Rapra Technology, Shrewsbury, UK, 2003 . 3). This can provide significant savings in demoulding and charging the moulds and reduce cycle time. During rotomoulding the plastic will naturally tend to adhere to the mould surface due to the higher surface energy of the mould material. This adhesion reduces the ease with which the plastic part can be removed from the mould and may result in a poor surface finish.
6 Materials for Rotational Moulding The majority of polymers used in rotational moulding are thermoplastics. Polyethylene in the form of a powder or pellets accounts for approximately 90% and PVC plastisols accounts for about 7% of all polymer materials that are rotationally moulded. The remainder consists primarily of materials such as polycarbonate, polypropylene, polystyrene, polyurethane, Nylon, unsaturated polyesters, acrylics, cellulosic, phenolics and silicone . The prevalence of thermoplastics in rotomoulding stems from their intrinsic advantages, in particular the ability to re-melt them without degrading their physical or cosmetic properties.
In addition, as the moulds do not require purging, different colour thermoplastics can be used between each moulding without the risk of colour contamination. Unlike competing techniques, the wall thickness of a part can be easily altered by varying the mass of plastic raw material in the mould, the mould itself does not need to be changed. The limitations of rotomoulding compared to alternative techniques are: • Long Processing Cycles: Unlike injection and blow moulding, rotomoulding requires the mould and plastic charge to be heated from room temperature to above the melting point of the plastic, held at an elevated temperature during rotation of the mould and then cooled to back to room temperature.
A Practical Guide to Energy Management for Processors by Energywise Consortium