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Register to Remove Trial Watermark!! means of slop rings in the rotating joints. Cooling is provided by blowing air through channels that are cast into the mold, as shown in figure. This machine concept has the advantage of direct heating of the mold and so it is very energy efficient. It is claimed that up 80% of the energy being input to the system is used to melt the plastic, compared with about 10% to 40% on a hot air oven machine. As the electrical machine does not use an oven, it also facilitates easy access to the mold for instrumentation, extra charges of material, etc. The disadvantages are that the molds cannot easily be modified and cycle times are long since heating, cooling and servicing take place sequentially rather than in parallel as in shuttle or carousel machine. 5.2 Selection of technology As mentioned above, various types of technologies and machines are used for production of overhead water containers and tanks. Conventionally rock and roll machines where being used for the production of overhead water tanks. However, these have now being replaced by turret machines which lead to better quality of production and much lesser environmental pollution. 5.2.1 Factors influencing the choice of technology A number of factors need to be taken into considerations while deciding the choice in favour of a process technology. These factors mainly include Factor inputs Market findings viz size of market and recurrence of repeat demand Purchasing power of consumers and prevailing price spectrum Future projections of market demand Availability of skilled manpower and support facilities Availability of infrastructure and transport facilities Environmental considerations 5.2.2 Technology recommended As the main product proposed to be manufactured in the unit would be the over head water storage tanks it is recommended that free arm turret machine with a molding capacity of around 1.5 to 2.0 million liters per month being installed alongwith turbo mixture, extruder, pulverizer and scrap grinder of matching capacity. Keeping in view that the color mixing and strength characteristics in polythene materials are best achieved by using of process of execution followed by pulverizing, installation of mixture unit, extruder and pulverizer unit is being recommended. A scrap grinding unit is also recommended to be installed in order to re-grind the scrap produced during the process. 27 Register eDocPrinter PDF Pro Online Now!!PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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