machinery feature | Screenchangers At K2016, Fimic also presented a third filter model
following eight years of research. Its NET filters will use a metal mesh that filters continuously without any stop – and with no need to modify the extruder.
Flush with success Gneuss presented a number of modified filtration systems at K2016, focusing on self-cleaning (or backflushing).
The highlight, says the company, was its RSFgenius 330 – the second largest filtration system in its range. The unit on display was destined for a BOPET line in Asia, where it will operate with a filtration fineness of 20 microns. The patented RSFgenius system operates automati-
The RSFgenius system from Gneuss has an efficient
back-flushing system
enables the screen to be changed without stopping the production line, using two filters in parallel. At the same time, Fimic has developed the Era filter
– first seen at Plast 2015 – which filters twice in sequence. It is aimed at highly contaminated material, which requires two filtering stages in order to obtain a usable material. In the past, this required high capital investment, as it needed two filters and a gear pump or a shorter extruder in the middle. The Era is formed by two inside filtering chambers, each of them mounting a screen with different filtration level. This removes need to have two filtering machines. The first chamber is typically 400 microns – produced using punched screens – while the second chamber is a 150 micron laser screen, which refines the quality of the material. However, the screens can be modified by the customer to suit their individual needs. The two chambers are independently managed, as
they have separate discharge valves. When a set pressure is reached in the first chamber, the related valve will perform the discharge after the blade holder has collected the contamination. The quality of the material will be higher than it would from a single filtration stage, with a difference in pressure between the two chambers of around 15 bars. Both the RAS and Era models can also use the backflushing feature, which enables filtration as low as 40 microns. However, backflushing has some limits: it produces a high level of plastic waste when the mesh is cleaned (about twice that discharged in the scraping technology) and can only operate with a lower level of contamination. Fimic recently installed an RAS700 unit at an
expanded polystyrene (EPS) recycling line in Spain. The line, which features a Starlinger extruder, is designed to process fish boxes and includes the Fimic filter to recycle 2,800kg/h of EPS, with 400 microns filtration.
18 FILM & SHEET EXTRUSION | December 2016
cally, and includes a highly efficient back-flushing system. The range is suitable for demanding applica- tions with high quality requirements, says Gneuss. It also exhibited an RSFgenius 175, together with a
process-constant automatic filtration system SFXmag- nus 150 and SFXmagnus 90 R with integrated back- flushing. The SFXmagnus range of automatic screen- changers is characterised by a large active area in a compact unit. This range of screenchangers is available with or without an integrated back-flushing piston, depending on the requirements of the process. Both RSFgenius and SFXmagnus ranges have been
revised during 2016. Modifications to the screenchanger housings permit operation on a wider range of applica- tions at higher pressures, while offering enlarged active filtration areas. Components and modules are shared between the two ranges in order to boost value for money and reduce delivery lead times. New for PVC processing is the SFpvc R, a develop- ment of the SFpvc that was launched at K2013. Both models are designed for challenging PVC recycling applications but the new SFpvc R offers an integrated back flushing system while maintaining process-con- stant operation. Finally, the KF 75 screenchanger, part of a range of
continuous rotary disc filtration systems, is designed for applications with frequent material type, grade or colour changes. KF screenchangers are compact and allow fast and simple screen changes on the fly, says Gneuss.
Click on the links for more information: ❙
www.nordson.com ❙
www.ettlinger.com ❙
www.screenchanger.com (Hitech) ❙
www.psi-polymersystems.com ❙
www.fimic.it ❙
www.gneuss.de
www.filmandsheet.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58