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Register to Remove Trial Watermark!! 5.1.7 Independent-Arm Machine Recently, independent-arm machines have been developed in an effort to improve the versatility of rotary machines. The current machines have five designated stations, and can have two, three, or four arms that sequence independently of one another. The first key to versatility is having fewer arms than stations. This allows the operator to designate the “empty” stations as auxiliary oven stations, auxiliary-cooling stations, and/or to separate the loading and unloading steps in the servicing stations. Figure shows on configuration, a four-arm machine with an auxiliary cooling station. Although these machines are more expensive than the other machine designs discussed above, they are ideal for custom rotational molding operations and now dominate the market for new machine sales. 5.1.8. Oil Jacketed Machines Direct heating of mold with liquid is much more efficient than heating by air in an oven. It is not surprising therefore that the heating of molds by circulating a fluid in a jacket surrounding the mold has been attempted and is being used commercially in a small number of specialized application areas. It is particularly attractive where the material has to be heated to high temperatures. For example, with polycarbonate, mold temperatures over 3000 (5720 F) are needed and heated oil jacketed molds have been found to be very successful with this material. 5.1.9 Electrically Heated Machines One of the most innovative types of rotational molding machine too have emerged in recent years is an electrically heated system in which a network of fine electrical wires are embedded in a cast, nonmetallic mold. The machine, illustrated in figure, provides full biaxial rotational and the power supply to the heating elements is by 26 Register eDocPrinter PDF Pro Online Now!!PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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