In recent decades Plastic industries are enlarging its field. Thus Plastic industries and Field Covers Such types of Processes like Injection, Blow, Rotational, Extrusion etc. this all molding processes are based on its principles and rules.
Rotational Molding Process is one of the main above processes in the Plastic Field. In this process mould is mounted on Turret Arm (Rotating Spindle). And with fed Plastic Raw material Heated into Oven (Furnace). Continuous process of heating gives results the shape of plastic raw material into mould Shape.
Rotational molding machines are made in a wide range of sizes. They normally consist of molds, an oven, a cooling chamber, and Turret (mould spindles).
Molds are fabricated from welded steel sheet. The fabrication method is often driven by part size and complexity. Moulds are typically manufactured from stainless steel, Mild Steel or aluminum. Aluminum molds are usually much thicker than an equivalent steel mold, as it is a softer metal. This thickness does not affect cycle times significantly since aluminum's thermal conductivity is many times greater than steel.
The main advantage of rotational molding field over the other plastic fields is, there is low budget in investment of machinery and Place. While, the main Disadvantages of Other Molding fields is large Equipments cost and other machinery cost to produce small product piece. There is high investment of machinery and Place to produce even small product.
Rotational Molding Process:-
Rotational Molding involves a heated hollow mold which is filled with a charge of material. It is then slowly rotated around two perpendicular axes causing the softened material to disperse and stick to the walls of the mold. In order to maintain even thickness throughout the part, the mold continues to rotate at all times during the heating phase and to avoid sagging or deformation also during the cooling phase.
In Rotational Molding Process there are mainly Four Steps involved to get desired Shape.