Double Piston Backflush Screen Changer with 4 Screen Cavities for Twin Screw Extruder
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Product Description
Double Piston Backflush Screen Changer with 4 Screen Cavities for Twin Screw Extruder
The GM-DP-BF series automatic backflush screen changer (double piston screen changer with four working positions) is designed to significantly extend the life of filter media. It ensures continuous operation while maintaining high filtration efficiency. The system automatically initiates backflushing when a pre-defined level of contamination is reached. Contaminants are removed through a spillway, and the contaminated material exits via heated backflush outlet pipes installed on the screen changer housing. This process ensures minimal disruption to your production line.
Working Principle (Backflush Process)
These systems operate as follows: When a pre-defined pollution level is reached, the backflushing process begins automatically. The contaminants from the screen pack are directed out of the machine through a spillway. The contaminated backflush mass leaves the machine using heated backflush outlet pipes installed at the screen changer housing. Small quantities can be removed or collected. With channel screen changers, additional slide valves are used in the backflush channels, ensuring no interference during the backflushing process.
Features Included
1. Continuous melt filtering
2. Four working stations
3. Venting groove to discharge gas mixed in raw materials
4. No interference during backflushing
5. Screen cleaning reaches 85%
6. Long lifespan of filtration screen pack/mesh, capable of up to 100 backflush cycles
The Self-Cleaning Backflush Screen Changer Finished
Screen Change Process
The screen changer and gas venting process of this type of double piston backflush screen changer with 4 screen cavities for twin screw extruder. The following process is based on standing face to the screen changer and extruder. One rod is pushed out on the left side of the housing of the screen changer by hydraulics. The blocked filter screen pack is removed and replaced by a fresh one. The rod is pushed into the housing of the screen changer. This rod is pushed out on the right side of the housing of the screen changer by hydraulics. The other blocked filter screen pack on this rod is removed and replaced by a fresh one. The other rods repeat the above steps. The gas venting system begins to work when the rod is pushed into the housing of the screen changer, and the following picture shows the process of gas venting of this type of dual rods continuous extrusion screen changer for polymer melt filtration.
Main Application Fields
For compounding, semi-finished production, recycling, manufacturing of fibers, polymerization, film extrusion, and fully automatic production processes.
Technical Data
Type
ScreenD&A
Â
Overall Dimension
Heating Power
(KW))
Output
(kg/h)
Â
Dia(mm)
Filtration Area(C)
L1
L2
L3
Â
Â
GM-DP-BF-120
100
78x4
220
180
1160
2.4/3.2
260-760
GM-DP-BF-135
115
104x4
250
205
1280
3.5/4.7
400-1100
GM-DP-BF-155
135
143x4
270
225
1420
5.0/7.2
600-1400
GM-DP-BF-160
145
165x4
310
260
1600
8.2/11.1
800-2000
GM-DP-BF-170
150
177x4
370
310
1750
9.4/12.7
1350-3000
GM-DP-BF-195
175
240x4
380
320
1900
10.2/13.8
1600-3800
GM-DP-BF-220
200
314x4
410
350
2100
13/17.5
1800-4500
GM-DP-BF-250
230
415x4
460
405
2760
15/21.5
2000-5000
Shipment and Service
Optional Choice
Adapters
Support Stands
Downstream Equipment: Such as GMACH Melt Gear Pump
Filter Mesh/Screen
Vacuum Cleaning Furnace
Tips for Customers
How to choose the most suitable type of screen changer for your extrusion line? After the equipment supplier makes a size recommendation, you should perform your own analysis to confirm appropriate sizing. This way, you'll benefit from independent analysis and avoid additional costs. Learn the difference between price and cost. Consider all variables and factors to determine the real cost of ownership for the screen changer. Hidden variables may include:
- Product quality
- Maintenance, time, and cost of parts
- Process downtime and cost
- Life expectancy of the equipment and amortized cost of ownership
- Cost and availability of filtration media
- Pressure loss and its effect on line output and product quality
- Operator safety
- Required operator intervention and labor cost
If you consider all these factors, you can choose the most suitable solution and expect a better return on investment.
For more information, please contact us.