Classifications

• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
  • D21F1/00—Wet end of machines for making continuous webs of paper
  • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
• • D—TEXTILES; PAPER
  • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
  • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
  • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor

Definitions

• the invention relates to a method for producing a finished pulp suspension for producing a paper, board, tissue or another fibrous web by mixing at least one high consistency flow formed from recycled fiber and filler with at least one of residues and fragments of the fibrous web Waste stream and at least one of fresh water, white water or similar formed low-consistency stream, wherein the streams are fed to a headbox of a machine for producing the fibrous web.
• the invention also relates to an arrangement for producing a finished pulp suspension for producing a paper, board, tissue or another fibrous web from at least one high consistency flow formed by newly processed fiber and filler, at least one reject flow formed from residues and fragments of the fibrous web and at least one, preferably fresh water, white water or the like formed low-consistency stream in the constant part of a machine for producing the fibrous web, wherein the streams are fed to a headbox of the machine.
• the object of the invention is to reduce the effort in the constant part. According to the invention the object was achieved in that the waste stream is processed separately before mixing with the high-consistency stream and the high-consistency stream in the constant part of the machine does not undergo cleaning.
• the broke usually comes from the downstream portion of the machine and essentially comprises lengths of fiber web or scrap resulting from the start-up of the paper machine or a pulp web tear.
• the low consistency stream should be cleaned before mixing with another stream.
• High consistency flow in the constant part of the machine also does not undergo degassing.
• the high consistency stream after stock preparation should be designed accordingly and the broke stream and low consistency stream should be degassed prior to its admixture.
• the degassing of the waste stream can take place during the treatment thereof.
• the waste stream prior to mixing with the high consistency stream with a low consistency stream and / or the high consistency stream before
• Mixing with the waste stream is mixed with a low consistency stream.
• the pulp suspension already has approximately the consistency required for the headbox.
• the high-consistency stream can be passed directly to the headbox of the machine even after mixing other streams in one or more mixing devices.
• High consistency stream after mixing is not diluted further or supplied in a headbox of the machine another low-consistency stream and mixed with the high-consistency stream.
• the fabric densities should be as high as possible. It is therefore advantageous if the consistency of the high-consistency stream before mixing with the waste stream is at least 1.2%, preferably at least 1.6% and in particular at least 2.1% and at most 12%, preferably at most 4% and in particular at most 3. 5%.
• the consistency of the waste stream should be between 2 and 5%, preferably between 2 and 4% after its preparation, in particular before mixing with the high-consistency stream.
• the high-consistency stream can be fed directly to one or more mixing devices from the stock preparation, in particular a chest to the headbox.
• the low-consistency stream and / or the waste stream before admixture by a degassing in particular a hydrocyclone, a centrifuge, a vacuum vessel o.a. and / or a cleaning device, in particular a Schireilabscheider, a sorter o.a. be directed.
• the fibers or the pulp suspension are essentially dissolved, bleached, ground, cleaned and dehydrated.
• the so prepared Pulp suspension with a high consistency of not more than 12% in a Stapelbütte 4 the constant part 6 provided.
• the high consistency stream 1 removed from the stack 4 is mixed with a plurality of low consistency streams 2 and a broke stream 3 until a material consistency of substantially between 1, 0 and 4%, preferably between 1, 0 and 10, required for the headbox 7 of the paper machine 2.0% is reached.
• the paper machine starts with the headbox 7 and a subsequent former 16 to form the fibrous web.
• the finished pulp suspension is applied via one or more nozzles of the headbox 7 on the forming wire of the former 16.
• the white water is collected and returned to the constant part 6.
• the use of white water to form the low-consistency stream 2 is not only associated with savings compared to the use of fresh water, but it can also be reused in the white water contained fiber and fillers.
• the committee comes from the paper machine, in which in particular during a demolition or the start-up of the machine always web remnants or longer track sections incurred as broke and are dissolved in a reject pulper.
• the high consistency stream 1 coming from the stacking chest 4 is diluted in a mixing device 8 with a low-consistency stream 2 and subsequently mixed with the reject stream 3 in a mixing device 9.
• the high-consistency stream 1 is continued directly to the headbox 7.
• headboxes are suitable in which streams of different consistency are mixed to regulate the basis weight transverse profile, as described, for example, in EP 1 645 684.
• the supply of at least one stream 1, 2 should be regulated for Basisthesquerprofiltechnik the fibrous web.
• the admixture takes place via an injection of the stream of higher consistency, wherein the inlet velocity of this stream is preferably 3 to 15 times the flow velocity of the stream having the lower consistency should.
• a mixing device 8,9,10 described in DE 100 50 109 is suitable.
• the low-consistency streams 2 are cleaned before being added to a cleaning device 15 in the form of a cleaner or sorter (police function) and then degassed in a degassing device 14.
• a cleaning device 15 in the form of a cleaner or sorter (police function) and then degassed in a degassing device 14.
• the waste stream 3 passes through a separate treatment device 11, which likewise comprises a cleaning device 13 and a degassing device 12.
• the waste stream 3 Before mixing the waste stream 3 with the high-consistency stream 1, the waste stream 3 may also be mixed with a low-consistency stream 2 in a mixing device 10 as required.
• the processed waste stream 3 can be passed directly to the stacking chest 4, where then the mixing with the high-consistency stream 1 takes place.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Paper (AREA)

Applications Claiming Priority (2)

Publications (1)

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Family Applications (1)

Country Status (4)

Family Cites Families (8)

• 2009
  • 2009-01-29 DE DE102009006715A patent/DE102009006715A1/de not_active Withdrawn
  • 2009-12-16 CN CN2009801557185A patent/CN102301067A/zh active Pending
  • 2009-12-16 WO PCT/EP2009/067250 patent/WO2010086065A1/de active Application Filing
  • 2009-12-16 EP EP09795755A patent/EP2391767A1/de not_active Withdrawn

Non-Patent Citations (1)

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