PlusTio

Solid Cross - 1. A Typical Die Design for extruding a solid rod is show in figure. 2. In the figure, DD is the diameter of die orifice,  DB is the diameter of bore of extruder barrel, α is the lead -in angle ,  and  P is the die land. 3. Because of the screen pack and breaker plate assembly,   the pressure in the extruder (PE)  is reduced by the pressure loss across the assembly (PL). 4. Since the die outlet is at atmospheric pressure,  the working pressure is the die pressure (PD)   given by the difference : PD = PE -- PL

Straight - Through Dies : √ Those die whose axes are arranged to be in line with the direction of supply of melt. √ Spider,  mandrel is needed for tubes . √ Used for the extrusion of pipe ,  rod ,  profiles and sheet . Crosshead  Dies - • Arranged with their axes at an angle of 908 (458 and 308 are also used)  to the melt feed.  •No need to for Spider assembly . Used for the production of insulated wires,  cables.  Offset Dies - • Combination of both straight - through die and off-set dies.  • Used for the production of pipe.