LDPE Reprocess Pelletizing Extrusion Plant with Self Cleaning Backflush Screen Changer

• Type: Sheet Extruder
• Plastic Processed: PE
• Product Type: Granulating Extruder
• Model NO.: GM-DP-BF series
• Feeding Mode: Multiple Feed
• Assembly Structure: Integral Type Extruder
• Screw: Twin-Screw
• Engagement System: Full Intermeshing
• Screw Channel Structure: Deep Screw
• Exhaust: Exhaust
• Automation: Automatic
• Computerized: Computerized
• Belong to: Auxiliary Part of The Whole Extrusion Line
• Function: Pelletizing Line/Granules Making Machine
• Application: TPU ,PA,POM,PMMA Reaction Extrusion
• Transport Package: Sea Worthy Packaging
• Specification: CE, SGS
• Trademark: Gmach
• Origin: Zhengzhou
• Production Capacity: 200 Sets/Year

Product Description

LDPE reprocess pelletizing extrusion plant with self cleaning backflush 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 process
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.


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