Extrusion is a material process used to make objects in a fixed cross-sectional shape. The material is pushed into the design of the mold so that all of the extruded strips have the same cross-sectional shape.Extrusion has two main advantages. The first is that it can make complex shapes,Website:http://www.etlink-precision.com, and the second is that brittle materials can also be applied because it is only subject to shear and pressure . Drawing is a similar process. The difference is that the extrusion pushes the material into the mold, and the draw is to pull the material out of the mold, so it can only be used for simple shapes. Pumping is often used to make wire rods, while extrusion is used to make bars and tubes.Extrusion can be continuous (making very long materials) or semi-continuous (making a lot of material). The extrusion process can be heated or carried out at room temperature and is referred to as hot extrusion or cold extrusi......url:http://www.etlink-precision.com