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Filtration System for Melt Polymer filtration

For melt polymer filtration, there are several types of filtration systems commonly used, including: screen changers; melt filtration systems; candle filters; disc filters; spinneret filters.

The selection of the most appropriate filtration system for melt polymer filtration depends on factors such as the type of polymer, process requirements, desired filtration efficiency, flow rate, and operating conditions. Please consult with Futai who can help determine the most suitable system for specific needs.


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Melt Polymer Filtration System

A melt polymer filtration system is essential in many applications where polymers are processed or used, such as in the production of PET/PA/PP polymer industry, pre-polymerizaton, final polymerization, filament yarn, polyester staple fiber spinning, BOPET/BOPP films, or membranes. This system helps remove impurities, contaminants, and viscosity-affecting particles from the molten polymer, ensuring the quality and consistency of the final product.

Melt-Polymer-Filtration-System-2
Melt-Polymer-Filtration-System-1

In order to improve the quality of the melt polymer and prolong the service life of the spin pack components, a continuous melt filter (CPF) is installed on the main melt pipe. It can remove mechanical impurities particles with a diameter greater than 20-15μm in the melt, and also has the function of homogenizing the melt. Generally the filtration system consists of two filter chambers, and the three-way valves are connected to the melt pipeline. The three-way valves can be switched periodically to alternate the use of the filter chambers to ensure continuous filtration. The housing of the filter chamber is cast in one piece with stainless steel. The large-area filter is composed of multiple pleated candle filter elements. The candle filter element is supported by a core cylinder with holes, and the outer layer is equipped with a single or multi-layer metal mesh or sintered metal powder disc or multi-layers metal mesh & sintered fiber or sintered metal wire mesh, etc.. in different filtration rate which is based on the requirements of final products.

In general there are different types of filtration system, such as Horizontal continuous filtration system, vertical continuous filtration system. For example, during the PET chips spinning process, the vertical candle-type filter type is commonly proposed, which is with a filtration area of 0.5㎡ per candle core. There are commonly used configurations of 2, 3, or 4 candle cores, corresponding to filtration areas of 1, 1.5, or 2㎡, and the corresponding melt filtration capacities are 150, 225, 300 kg/h. The vertical filtration system has a larger size and more complex operation, but it has many advantages from a process perspective: (1) It has a large thermal capacity, small melt temperature variation, and no dead zones when the material flows. (2) The insulation jacket structure is reasonable, and the temperature is uniform. (3) It is convenient to lift the filter core when switching the filter.

The pressure difference before and after the newly used filter is low. As the usage time increases, the filtering medium holes gradually become blocked. When the pressure difference reaches the setting value, e.g, such as for PET chips spinning, generally the figure is about 5-7MPa, the filter chamber must be switched. When the allowed pressure difference is exceeded, the filter mesh may be twisted, the mesh size increases, and the filtration precision decreases until the filter medium is ruptured. The switched filter core must be cleaned before reuse. The clarity of the effect is best determined by the "bubble test" experiment, but it can also be judged based on the pressure difference before and after the newly switched filter. Generally, when the candle filter has been ruptured or cleaned 10-20 times, it should no longer be used.

For example, for Barmag NSF series filters, they are heated by Biphenyl steam in the jacket, but the temperature of the heat transfer fluid should not exceed 319℃, and the maximum Biphenyl steam pressure is 0.25MPa. The maximum design pressure of the filter chamber is 25MPa. The maximum allowed pressure difference before and after the filter is 10MPa.

Technical Parameters

Model L B H H1 H2 FIX(H3) Inlet&Outlet DN(Φ/) Filter Area(m2) Applicable Screw Bar(Φ/) Designed Flow Rate(kg/h) Filter Housing Filter Element Total Weight(kg)
PF2T-0.5B 900 1050 1350 As customer's Site 2200 22 2x0.5 65 40-80 Φ158x565 Φ35x425x4 660
PF2T-1.05B 900 1050 1350 2200 30 2x1.05 90 100-180 Φ172x600 Φ35x425x7 690
PF2T-1.26B 900 1050 1390 2240 30 2x1.26 105 150-220 Φ178x640 Φ35x485x7 770
PF2T-1.8B 950 1140 1390 2240 40 2x1.8 120 220-320 Φ235x620 Φ35x425x12 980
PF2T-1.95B 950 1140 1390 2240 40 2x1.95 130 250-350 Φ235x620 Φ35x425x13 990
PF2T-2.34B 1030 1200 1430 2330 40 2x2.34 135 330-420 Φ235x690 Φ35x485x13 1290
PF2T-2.7B 1150 1200 1440 2350 50 2x2.7 150 400-500 Φ260x690 Φ35x485x15 1320
PF2T-3.5B 1150 1250 1440 2350 50 2x3.5 160 500-650 Φ285x695 Φ35x485x19 1450
PF2T-4.0B 1150 1250 1500 2400 50 2x4.0 170 600-750 Φ285x735 Φ35x525x19 1500
PF2T-4.5B 1150 1250 1550 2400 50 2x4.5 180 650-900 Φ285x785 Φ35x575x19 1550
PF2T-5.5B 1200 1300 1500 2350 50 2x5.5 190 800-1000 Φ350x755 Φ50x500x15 1650