Recycling/Pelletzing Extrusion Line used automatic back flush screen changer
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.
Features included
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.
screen change proces
The screen changer and gas venting process of this kind of Automatic backflush screen changer with four working positions for plastic extrusion machine
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.
Pictures of the finished products
Main application fields of Automatic backflush screen changer with four working positions for plastic extrusion machine
for compounding, semi-finished production, recycling, manufacturing of fibers, polymerization, film extrusion
for fully automatic production processes
Technical data
Type |
ScreenD&A
|
Over all dimension |
Heating power
(KW)) |
Output
(kg/h) |
|
Dia(mm) |
Filtration area(C) |
L1 |
L2 |
L3 |
|
|
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 |
Service of Gmach
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