Compression Moulding
INTRODUCTION Moulding is the shaping of raw material using a solid frame of a particular shape called a pattern.It is a process used in the manufacturing of materials and mostly include elastomers,Plastic,metal,glass and ceramic. It consists of placing a pre cut rubber compound into a two piece heated mold kept in a press. The pressure applied by the press forces the material to flow and fill the mold. Compression mold are simple and many rubber products like conveyer belts,seals and gaskets are made by the method. A simple punching or cutting procedure directly from the rubber slabs produces blanks or alternatively the rubber compound is squeezed into shape with the aid of a plunger or screw through an extruder die. The strip obtained is then cut into suitable lengths. The supply of heat depends on the rate of heat conduction from the mould to the rubber. Since the heat conductivity of rubber is poor, heating is slow and the curing time is therefore relatively long...