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Register to Remove Trial Watermark!! In a rock-and-roll machine, usually a single mold is mounted in the mold frame, the rotational speed is low (typically 4 rev/ min), and the rocking angle is less than 450. Direct gas impingement is an effective method of heating for sheet-metal molds and is often used in rock-and-mold machines. If the gas jets are played against the bottom or lower portion of the mold assembly, a simple sheet-metal shroud over the top portion of the mold assembly is sufficient to carry away combustion products. The proximity of the gas jets to the metal mold is an important factor in mold heating. The gas gets should always be a fixed distance from the outside surface of the mold to avoid hot spots. Obviously this is easiest to achieve in cylindrical molds. 5.1.2 Rock and Roll machine with rocking oven Rock and Roll machine with rocking oven machine the mold is surrounded by an oven, heated by hot air, and the oven rocks with the mold as shown below. The rocking oven must contain appropriate burner assemblies, ducting and blowers, as well as an adequate shroud. In some cases the mold assembly is mounted on a rail carriage, so that it can be rolled from the oven chamber to the cooling area. Frequently the cooling area is also the servicing station. For smaller rock-and-roll machines, the oven can be shuttled, or crane-lifted, over the mold assembly. For larger machines, the oven is stationary and the mold assembly is moved into it through a single door. 5.1.3 Clamshell Machine This machine is characterized by an oven that closes in a “clamshell” action over the mold. These machines have the attraction of a small floor footprint. The machine provides full biaxial rotation and has the advantage that the horizontal shaft can be supported at both ends. The molds are located on assemblies that are in turn mounted on turntables geared through the main shaft / axle. 23 Register eDocPrinter PDF Pro Online Now!!PDF Image | ANALYSIS OF ROTO-MOULDED PLASTIC CONTAINERS
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