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1、Blow moulding is used to manufacture bottles and containers with very thin walls. Blow moulding first requires a tube of plastic to be extruded. The tube of molten plastic is extruded between the two halves of a mould. Before the plastic cools the two halves of the mould are brought together and air

2、 is blown into the centre of the material through a blow pin. This forces the plastic out forming the shape of the mould. The plastic can then be cooled and removed.This technique is used to produce plastic bottles.Advantages - High production rates.Disadvantages - Poor quality s

3、urface finish. Can only be used for thin walled materials. This process is widely used to form metal and plastic components that have constant cross sectional shapes such as pipes, curtain rails etc.The extrusion process is similar to injection moulding. Plastic granules are heated in a hopper and a screw thread forces the material through a die.The material is then cooled. Extrusion can only be used for simple shapes and the

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