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Self-cleaning backflush extrusion screen changer for twin screw extruder
GM-DP-BF series Automatic backflush screen changer( double piston screen changer with four working positions)
In order to considerably increase the lifetime of the filter media GMACH offers automatic backflush screen changers.
Working principle (backflush process)of this double piston backflush screen changer with 4 screen cavities fortwin screw extruder
These systems work as follows: When a pre-defined pollution degree is reached, the backflushing automatically starts.
Then the contaminations from the screen pack are led out of the machine via a spillway. The contaminated backflush mass leaves the machine by means of heated backflush outlet pipes which are installed at the screen changer housing. There the small quantity may be removed or collected.
With the-channel screen changers additional slide valves are used at the backflush channels. There is no interference of the process during backflushing.
1,Continuously working melt filter
2,Four working stations
3,venting groove can discharge the gas mixed in the raw material
4, no interference during the process of backflushing
5,the screen cleaning reached 85%
6, long life span of the filtration screen pack/mesh , it owning to up to 100 times backflushing at most.
The screen changer finished
screen change process
The screen changer and gas venting process of this kind of Double piston backflush screen changer with 4 screen cavities fortwin 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 hydraulically
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 rignht side of the housing of the screen changer by hydraulically.
the other one 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 systen begins to work when the rod is pushed into the housing of the screen changer, and the following picture show the process of gas venting of this type of dual rods continuous extrusion screen changer for polymer melt filtration.
Main application fields of Double piston backflush screen changer with 4 screen cavities fortwin screw extruder
for compounding, semi-finished production, recycling, manufacturing of fibers, polymerization, film extrusion
for fully automatic production processes
down stream equipments: suach as Gmach melt gear pump
vacuum cleaning furnace
Tips for customers
How to choose a most suitable type of screen changer for your extrusion line ?
After the equipment supplier making a size recommendation and then you should perform your own analysis to confirm appropriate sizing. That way, you will have the advantage of independent analyses and, best of all, there is no additional cost.
Learn the difference between price and cost. Be sure to take into consideration all of the variables and look at all the factors to determine the real cost of ownership for the screen changer. Some of the hidden variables to consider may be:
Maintenance, time and cost of parts.
Process downtime and cost.
Life expectancy for the equipment and amortized cost of ownership.
Cost and availability of filtration media.
Pressure loss and effect on line output and product quality.
Required operator intervention and labor cost.
If all of these and other factors are taken into consideration, you can choose the most suitable solution, and then you can expect a much better return on investment.