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Register to Remove Trial Watermark!! CHAPTER 5 – THE PLANT 5.1 Roto moulding technologies and machines The basic principle of rotational molding involves heating of plastic inside a hollow shall like mold which is rotate so that the molten plastic forms a coating on the inside surface of the mold. The rotating mold is then cooled so that the plastic solidifies to the desired shape and the molded part is removed. There are many methods/ technologies that can be used to achieve the essential requirement of mold rotation, heating & cooling. Accordingly a number of technologies / commercial molding machines have been developed and are used in the industry. We shall focus on a few that have seen mainstream commercial application in the roto molding industry. The varieties of machines that are available are as under: Rock and Roll machines Rock and Roll machine with rocking oven Clamshell machines Vertical machine Shuttle machines Carousel, turret or rotary machine Independent arm machine Oil Jacketed machine Electrically heated machine 5.1.1 Rock-and-Roll Machine: This design concept of a rocking action about one axis (“rock”) and a full 3600 rotation about a perpendicular axis (“roll”) as one of the earliest used for rotational molding. This type of machine is shown a schematic in below. It has been generally accepted that machines that are capable of providing full 3600 rotation about two perpendicular axes have superseded the “rock-and-roll” concept. For a long time it has been thought that rock-and-roll machines are best suited to end products that are approximately symmetrical about a central axis, such as lamp-posts, canoes, and kayaks. However, in recent years there has been a renewed interest in rock-and-roll machines because they offer simplicity in design and have the major advantage that it is easier to get services to and from the mold. It has also been found that the control over te wall thickness distribution can be just as good as that achieved on a biaxial rotation machine, for the vast majority of mold shapes. Register eDocPrinter PDF Pro Online Now!! 22PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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