Melt filtration | processing feature
into a spillway for expulsion. Wöstmann says that up to 100 back-flushes have been achieved with the automatic power back-flush system before a screen change is required. “Thus, screen costs are reduced significantly, compared with a screen-changer without a back-flush function,” he adds. A screen change, moreover, can be done during compounding, eliminating downtime. The V-Type screen cavities come in diameters of 125 to 340 mm, which yield filter areas of 4 by 122 to 4 by 908 cm2 The screen-changer works well with “sensitive
.
processes,” Wöstmann notes, and provides a fast return on investment.
High-volume systems One specialty that Coperion brings to filtration is the construction of screen-changing systems for large- volume compounding. Jürgen Bartl, product manager for downstream equipment at the company, says that typical throughputs of these lines start at 6 to 7 tonnes/ hour, with many at 50 to 70 tonnes/hour. The trend towards ultra-high-volume compounding is producing lines with capacities of 100 tonnes/hour. Coperion has,
in fact, supplied screen-changing equipment (and compounding lines) for such lines, and has additional systems on order. The filtration units Coperion builds for high-volume
compounding generally use candles, long circular screens with mesh wrapped around the outer circum- ference. Candles are up to 20 cm long, while the standard range of screen filtration measurements is 20 to 325 mesh, with special applications available up to 500 mesh and in multilayer constructions. Each cavity in
Coperion’s
high-volume lines use candles to
increase the filtration area
POLYMER PROCESSING SYSTEMS
200+ Years of Combined Plastics Industry Experience
info@nordsonpolymerprocessing.com
www.nordsonpolymerprocessing.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 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68 |
Page 69 |
Page 70 |
Page 71 |
Page 72