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Register to Remove Trial Watermark!! time, then this system can approach the optimum in terms of maximum output rates. The key to longevity of this machine is the protection of the drive engine from the high oven temperatures and the corrosiveness of the cooling water. Since the scheduling of time in the oven is at the discretion of the operator, the dual-carriage machine is more versatile than the fixed-arm carousel or rotary machine sometimes. 5.1.6 Carousel, Turret or Rotary Machine The carousel, turret, or rotary machine was developed for long production runs of medium to moderately large parts. It is now one of the most common types of machine in the industry. The earliest machines had three arms 1200 apart that were driven from a single turret. All arms rotate together on fixed-arm machines. One arm is at each of the three stations -heating, cooling, servicing- at all items, as shown in figure below. The carousel machine exemplifies the advantages of the rotational molding process in that different molds, and perhaps different materials can be run on each arm. It is possible to change the combinations of molds on one arm or on the other arms at regular intervals so that there is great versatility in production schedules. A disadvantage of the fixed-arm machines is that for optimum use, heating, cooling, and servicing times have to be matched. If they are not, then the cycle time is dictated by the slowest event and time is wasted in the other areas. This disadvantage has been overcome extent with the development of the independent arm carousel machine discussed subsequently. Four-arm fixed-arm machines, with the arm 900 apart, are also available. Usually the fourth arm resides in an auxiliary cooling station when the other three are in heating, cooling and servicing stations. As a result, four-arm machines are popular when the process is controlled by the cooling cycle. 25 Register eDocPrinter PDF Pro Online Now!!PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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