PAPER RECYCLING PLANTS - AR Thomson Group

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RREECCYCCLLEED PPAAPPEERR AESSEAL® PAPER RECYCLING PLANTS L-UK/US-RECYCLE-03 IN 4540 - 02/2002 10 It is often the case that centrifugal cleaners are followed by a series of COARSE Pressure Screens. Typical Vertical Pressure Screen. HEAVY REJECTS STATIONARY PERFORATED SCREEN PLATE MULTI BLADE ROTOR REJECTS TRAP © Copyright 2002 AESSEAL plc All Rights Reserved. STOCK IN ACCEPTS SEAL POSITION Thin stock typically 0.4 to 2% having had sand and grit removed still contains other contaminants e.g. plastic, synthetic fibres which can be screened out using Pressure Screens. The Pressure Screen works as follows (see above). The thin stock enters the screen tangentially at the top and the flow is obstructed by a weir separating the heavy particles which exit through the TRAP. The pulp flows over the weir and passes through the annular space between a rapidly moving rotor and a stationary basket (see above). The rotor is designed to create RADIAL PULSATIONS within the flow which assist in forcing the pulp fibres through the screen slots. Typical slot/holes widths are 0.030" (0.4mm). The screened pulp fibres pass through to the ACCEPTS branch of the screen. In order to maintain continuous throughput the screen must contain means to prevent “Blinding” of the basket (i.e. blocking), a common method is to use screen plate dilution water flow, which dislodges debris on the rejects side of the screen (see above). Rejects fall to the bottom of the screen and exit via the Rejects Port. The pressure screens are periodically removed for thorough cleaning on a planned maintenance routine.
TYPICAL SCREEN SEAL DESIGNS © Copyright 2002 AESSEAL plc All Rights Reserved. RECCYCCLLEEDD PAAPEER AESSEAL® PAPER RECYCLING PLANTS L-UK/US-RECYCLE-03 IN 4540 - 01/2002 11
Page 1 and 2: A Guide to Sealing PAPER RECYCLING
Page 3 and 4: CONTENTS Description Page Introduct
Page 5 and 6: WHY RECLAIM? The World consumption
Page 7 and 8: FEEDSTOCK STORAGE The process requi
Page 9: Typical Fiberizer seal design Typic
Page 13 and 14: DE - INKING The Thin Stock still co
Page 15 and 16: DISPERSER (DISPERGER) Even at this
Page 17 and 18: TYPICAL PUMPS USED IN A PAPER RECYC
Page 19 and 20: Typical Mechanical Seal Specificati
Page 21 and 22: Double seals will always out perfor
Page 23 and 24: Seal Locations on a Paper Recycling
Page 25 and 26: FLOTATION CELL PUMP Concentration O
Page 27 and 28: POST FLOTATION STOCK PUMP Concentra
Page 29 and 30: WASTE WATER DISPERSION PUMP Option
Page 31 and 32: FIBERIZER Option Minimum Spec. Best

PAPER RECYCLING PLANTS - AR Thomson Group

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