Proven and sophisticated: Shaft seals in waste paper treatment
Waste paper is fiberized in pulpers using large amounts of water with the addition of chemicals and is sorted into slightly and heavily contaminated fractions. In the de-inking process, the printing ink is chemically and mechanically removed and is skimmed as foam from the surface in the subsequent flotation.
The shafts of bleaching agent pumps, MC pumps, dispersers, slurry pumps, sorters, pulpers and fiberizers are successfully equipped with EagleBurgmann single and double seals. Our compression packings reliably seal bleaching agent pumps and separators.
The Palm Paper Ltd. paper mill produces newsprint for national and international newspapers. Production is based solely on waste paper pulp. A TotalSealCare service agreement having a duration of several years includes servicing of all installed mechanical seals for pulp pumps, mixers and various pressure screens. Additional contractually agreed services are on-site presence during start-ups, troubleshooting and providing seal-related schooling and training courses for plant personnel.
In the waste paper treatment at Palm in Wörth, Germany, four TL200/TL300 type Metso Screens with LP-D-ST-D15/130-DE were retrofitted to non-flow operation and have been running in continuous operation (24 hrs./day) since 2004.
Medium: Pulp 3 % abs. dry and water, t = 50 °C (122 °F), p3 = 4 bar (58 PSI), n = 800 min⁻¹.
At UPM Kymmene Shotton in England, nine Voith pressure screens in waste paper treatment are being used successfully with EagleBurgmann HR-D type double cartridge seals. Medium to be sealed: Pulp fibers 1.5 ... 4 % abs. dry and water, p = 8 bar (116 PSI), t = max. 40 °C (104 °F).
In Kartonsan, Turkey, numerous pumps for pulp treatment and in the de-inking system have been successfully equipped with EagleBurgmann Burasoft 6225-L type compression packings.
At Stora Enso Maxau, Germany, Voith slot sorters in a waste paper treatment plant for the production of standard and upgraded newsprint paper are sealed with EagleBurgmann HR10 type seals (“dead-end“). Flushing with circuit water (return water) is used only when the medium has a too high solids content.
Face material combination SiC/SiC, shaft diameter d₁ = 46 – 130 mm (1.81" – 5.12"), p1 = 1 bar (15 PSI), t = 60 °C (140 °F), n = 980 min-1, medium: Paper pulp (0.2 ... 5 % abs. dry).
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