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5. Filter changer
It is always necessary to filter the melt at the extruder exit to retain any foreign matter in order to :
prevent contamination of the sheet or plate, especially when very high levels of ground material are involved;
avoid clogging the material channels in the coextrusion box and die;
to eliminate the risk of damaging the chrome-plated polishing-calendering rollers.
Fine-mesh and/or very fine-mesh sieves are used, inserted against cylindrical plates with holes. When degassing occurs, as the sieve clogs and the pressure upstream of the sieve increases, the second stage of the screw, whose pumping capacity decreases, fills up with more and more material until the degassing zone backs up, at which point the filter has to be changed....
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Filter changer
Gear pump
Bibliography
Software tools
Contour TM Die (EDI)
BEMflow, Boundary Element Fluid and Heat Transfer Simulation Program
Inverted preland Die (Cloeren)
Websites
Octal
Rauwendall
The Madison Group
Verbruggen...
Standards and norms
- Management environnemental. Exigences et lignes directrices pour son utilisation. - ISO 14000 - Nov. 2004
- Food safety management systems – Requirements for all organisms in the food chain. - NF EN ISO 22000 - Oct. 2005
Directory
Manufacturers – suppliers (non-exhaustive list)
Robert Barr, Inc.
HPM
Extrusion Dies Industry, LLC
Statistical and economic data
Figure 1 compares the performance of two equivalent systems in terms of instantaneous available flow:
1 production unit, 1,300 kg/h, investment value €1.5 M ;
2 production units...
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