COP series
Hydraulically controlled intermittent flow screenchanger
COP is a hydraulic controlled screenchanger, with discontinuous flow of the filtered melt.
The great advantage of this type of screenchanger is the possibility of replacing the filtering screens with great facility and rapidity, thanks to the screens installed on a sliding plate which is automatically controlled.
Operation
The melted material which needs to be filtered flows through a channel inside the screenchanger. The channel is fitted with a sliding plate on which there are two filtering units, each of which can be provided with a filtering screen.
When the filtering screen in operation needs to be replaced, the control hydraulic unit pushes the plate and brings the dirty filter to the outside in order to make it accessible for cleaning. With this movement the second filter is moved into a working position so that the filtering process can continue.
Only a fraction of second is necessary for these operations. The moving system of the plate is very fast and it allows keeping the efficiency of the equipment at the top levels. The extreme speed of the change allows operating without stopping the extruder activity.
Advantages
COP is QUICK
To move from the filtering screen in use to the clean screen takes only a fraction of second.
- Extraction and replacement of the filtering screens take place very quickly and maintenance can be carried out in a short time
- The speed of the change from one screen to the other means that the action of the extruder is not interrupted
COP is FLEXIBLE
COP can be mounted both horizontally and vertically without affecting performance; in addition COP can be controlled by just one hydraulic unit.
- Mounted both horizontally and vertically, the COP screenchanger can be introduced very successfully onto pre-existing installations or where the space available is restricted, but without compromising high quality processing
- Several COP screenchangers can be controlled by the same hydraulic unit, resulting in large savings and maximum use of space
COP is SAFE
The screenchanger is provided with several devices which guarantee its safe use.
- The safety blocking system of the doors and the hydraulic unit protects from the movements of the plates and from accidental opening during maintenance
- The block of the accumulator prevents the hydraulic unit to exceed the adjusted maximum pressure
- Bushings and Teflon rings or special materials (PEEC, Rulon) chosen according to the requirements of the plant, guarantee a perfect seal during the sliding of the plates
| Technical data | |
|---|---|
| Processing | Hydraulic control with intermittent flow |
| Type of material | Steel |
| Diameters of filtering unit | From 50 to 350 mm |
| Heaters | Vertical, Flat, Circular |
| Material status | From low pollution to recycled |
| Operating temperature | Up to 280° |
| Pressure | Up to 500 bar |
| Hourly capacity | Up to 2000 kg/h |
| Machined material | PE, PP, ABS, PET, PS, etc. |
| Resulting product | Bioriented films, bubble films, casts, sheets, flat head plates, pipes, profiles, Hot Melt |
Special installations
The COP series screenchanger can be installed both horizontally and vertically and can be introduced into pre-existing installations or where the space available is restricted but without compromising high quality processing.
For maximum use of space, and economic advantage, several COP series screenchangers can be connected to one hydraulic unit.
The applications
the COP series is a solution for granulation, re-granulation and regeneration installations as well as processing lines of bioriented films, bubble, films, casts, sheets, flat head plates, pipes, profiles, Hot Melt.
Polymer extrusion gear pumps
The polymer feed gear pump AT was designed and created on the basis of first hand experience by highly qualified gear experts and specialists in the field of thermoplastics extrusion.
During the research and preliminary design stages, particular attention was paid to the profile of the gear teeth and their geometrical proportions.
The construction materials are accurately selected and tested, and subjected to special thermal treatments and rigorous controls during the various machining phases.
ALFATECH’s in-depth capability in the field of research and in the development of solutions capable of increasing the technological level and productivity of extrusion lines, has produced an integrated polymer feed system called SIDOP, particularly indicated for rapidly resolving production problems; the SIDOP system may be applied independently or interfaced with the management logic of the extrusion line.
The enthusiasm and satisfaction of users of our SIDOP system are proof of the productivity and reliability of the AT pumps and our customers can confirm the benefits and the advantages, a few of which are summarised below:
- improved product quality, with more accurate and uniform dimensional tolerances, guaranteed by a constant melt flow rate, even during variations in viscosity and temperature or inconsistencies from screw surging;
- increased production capacity, thanks to optimisation of screw speed and extrusion pressure, both being regulated and controlled by the systems control modules;
- "energy/capacity" ratio reduced, thanks to optimisation of the entire productive process;
- reduced raw material consumption, a consequence of the reduction in waste and of an increase in the quantity of recycled material;
- extended extruder life, guaranteed by the remarkable decrease in work pressure thereby benefiting the screw, barrel and thrust bearing of the reduction gear.
The SIDOP system developed by ALFATECH signifies integration on the following components:
- AT gear pump, representing the fundamental element of the feed process;
- control module, which manages and regulates the process;
- DC/AC gearmotor group, appropriately dimensioned for the maximum operative conditions of the system;
- Telescopic cardanic coupling, providing motor drive between the reduction gear and the pump, allowing also for thermal dilatation of the extruder.
The function of SIDOP are characterised by the complete automation of coordination between extruder-pump, thereby guaranteeing that the pump is 100% full at all times.
In these conditions the major benefits, deriving from maintaining the pressure downstream of the pump in constant values and eliminating variations in parameters during processing, are obtained.
Automatic control of extruder speed is the ideal solution for guaranteeing optimal operative conditions of the pump.
