Screenchangers and melt fi ltration | process feature
Clean game
Screenchangers play a crucial role in improving melt quality and performance. They prevent damage to downstream equipment, enhance product appearance and help to prevent mechanical failure of fi nished parts. They can also add value to recycled material and contaminated melt sources. Blown fi lm line producer Hosokawa Alpine has used
several K-SWE continuous screenchangers from Kreyenborg of Germany to increase the productivity of its lines. Screen changer systems in blown fi lm plants are
usually simple, discontinuous models that make it necessary to shut down the line for fi lter change, says Kreyenborg. These are commonly known as slide plate fi ltration systems. The K-SWE screenchanger is a modern fi ltration
system that allows the mesh to be changed without interrupting production. This means that the system can keep running while dirty fi lter elements are replaced, or fi ltration fi neness for different production batches are changed. To guarantee a smooth, reliable
fi lter change during operation, the screenchangers are provided with a separate control. These retrofi ts should eliminate production line shutdowns during fi lter change, while improving fi ltration result. Kreyenborg says that the number of start-up processes is reduced to
www.fi lmandsheet.com
Melt fi ltration helps to maintain machine performance and boost product quality. We look at some of the latest screenchangers
a minimum, as are reject parts and start-up losses due to fi lter changes.
At the same time, Kreyenborg’s V-Type back-fl ush screenchanger is designed so that only one of its four screens is taken out of production during the back- fl ush or screen-change procedure to ensure higher constant melt pressure.
Additional benefi ts of the K-SWE-4K-75-V/RS are its higher back-fl ush effi ciency, longer screen life and constant volume fl ow during back-fl ush. It also has
optimised screen retainers with increased pressure capabilities to deliver a more effi cient back-fl ush operation. In addition, the displacement pistons and fl ow channels are confi gured to minimise the melt residence times.
The latest screenchanger from PSI-Polymer Systems includes a unique back fl ushing system, where the contaminated screen packs are fl ushed and discharged
Hosokawa
Alpine has used several K-SWE continuous screen-
changers from Kreyenborg to increase the
productivity of its blown fi lm lines
The KCH was designed for low viscosity resins but has delivered broader benefi ts
December 2012/January 2013 | FILM & SHEET EXTRUSION 33
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