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Process
PROCESS OF MANUFACTURING THREE- LAYERED JOINLY EXTRUDED PE PIPE
There is a known sentence saying "the thing that has brought you to your today position isn’t enough to keep you in that position tomorrow". The experts of this company decided to realize that sentence by unique designing and using up- to -date equipment and succeeded to invent a new manufacturing process known as three-layered jointly extrusion to meet previous shortages. After inventing the process of manufacture three-layered PE pipe, the parameters effective in quality of PE pipe like temperature, pressure and thermal history have become controllable. In this new process known as three-layered jointly extrusion, always three similar PE types are used in three layers with front layered structure. Using two registered inventions have caused promotion of the quality of the products of this company:
-Using direct drive systems of extruder without gearbox and with zero slip
-Using SGP system for eliminating axial tolerance and preventing PE' s thermal degradation in melt pumping area .
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تصویر |
Parameter |
Old process |
New process |
 |
Temperature |
Because of screw and barrel's axial pumping, temperature in extruder's outlet area is increased and becomes uncontrollable |
Because of eliminating screw and barrel's axial pumping, temperature in extruder's outlet area becomes adjustable and controllable |
 |
Thermal Degradation |
Increase in temperature in pumping area causes thermal degradation of PE and decreases molecular mass of PE and generates free radical in PE Chain |
Because of controllability of temperature in all areas of extruder, thermal degradation doesn't happen. |
 |
Pressure |
Production of high pressure in melt pumping area because of role of screw and barrel's axial pumping |
Adjustability of pressure in melt pumping area because of eliminating screw and barrel's axial pumping |
 |
Pressure alterations |
At least %8 melt pressure alteration because of screw and barrel's axial pumping |
Eliminating melt pressure alteration because of eliminating screw and barrel's axial pumping and melt pumping with uniform pressure into die |
 |
Thickness alterations in length of pipe |
At least %7 thickness alteration in length of pipe because of melt pressure alteration |
Eliminating thickness alteration in length of pipe because of keeping melt pressure constant |
 |
Kg/hr |
At least %5 alteration in extruder outlet because of motor slip and gearbox mechanical losses |
Eliminating alteration in extruder outlet because of using direct drive system without gearbox with zero slip |
 |
Kg/m |
At least %5 alteration in product because of using open loop control system |
Eliminating alteration because of using servo system and closed loop control |
 |
Energy consumption |
High energy consumption per one kilogram of produced pipe because of indirect energy transfer into screw and barrel |
At least%20 decrease in energy consumption per one kilogram of produced pipe because of direct energy transfer into screw and barrel |