How to improve the dimensional accuracy in Plastic Extrusion

How to improve the dimensional accuracy of Plastic Extrusion

 

Source :http://news.bjx.com.cn/html/20130401/426122.shtml

 

extruder outlet pressure is affected by various factors, there are large fluctuations , will be able to affect the dimensional accuracy of the product , if we export between extruder and die installation of a the melt pump , the extruder outlet may be used to stabilize pressure fluctuations , making the linear extrusion becomes possible to improve the dimensional accuracy of plastic products, improve the yield of the extruder per unit time . Heiko melt pump is a positive displacement transportation equipment, precision gear clearance and volume structure design, extrusion stable equilibrium possible in fiber , granulation, plastic film, sheet, plate , extrusions , pipes , wire and cable , wire drawing , composite extrusion production line is widely used , and achieved good results :

 

1 , to achieve a stable extrusion , extrusion products to improve the dimensional accuracy , reduce scrap rates. In the extrusion process, the material uniform charging amount , the volatility of the barrel and the die temperature , screw speed pulsation phenomenon is difficult to avoid . Use melt gear pump feeding system eliminates feeding errors can be greatly reduced fluctuations upstream process passed quickly into the stable working condition, improve the dimensional accuracy of extruded products , reduce scrap rates.

 

2 , increase production, reduce energy consumption and achieve low-temperature extrusion, extend the life of the machine . Since the installation of the extruder the polymer melt pump , the pressure is transferred to the function of the extruder gear pump is completed , the extruder can be operated at low temperature and pressure state , the leakage flow is greatly reduced, the yield is improved. Gear pump more efficiently than the extruder head pressure established , and reduce the back pressure of the extruder , the screw withstand axial forces fall and prolong life.

 

3 , a linear extrusion characteristics , easy on the downstream device coordination. As the gear pump leakage is less traffic , transport capacity and speed of the pump basically a linear relationship , the gear pump speed changes , the flow can know exactly , because you can determine the downstream equipment and gear pump operating speed sync , use a gear pump inlet pressure at the outlet collection , temperature and other information , the entire extrusion process throughout the on-line monitoring and feedback control.