US3596840A - Process for disintegrating dry cellulose pulp - Google Patents

Process for disintegrating dry cellulose pulp Download PDF

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Publication number
US3596840A
US3596840A US660451A US3596840DA US3596840A US 3596840 A US3596840 A US 3596840A US 660451 A US660451 A US 660451A US 3596840D A US3596840D A US 3596840DA US 3596840 A US3596840 A US 3596840A
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United States
Prior art keywords
pulp
milling
accordance
disk
shredded
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Expired - Lifetime
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US660451A
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English (en)
Inventor
Nils Verner Blomqvist
Ingemar Liss-Albin Croon
Lars Goran Eriksson
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Mo och Domsjo AB
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Mo och Domsjo AB
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
    • D21B1/066—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being pulp sheets

Definitions

  • PROCESS FOR DISINTEGRA'I'ING DRY CELLULOSE PULP It is understood that disintegrating cellulose pulp to fluff means that the-pulp is broken up so that the fibers are laid bare while simultaneously trying to avoid fiber cutting and formation of fiber bundles.
  • cellulose fluff can be advantageously produced starting from pulp in sheet form obtained by conventional methods if the pulp is shredded in dry v condition and then, still in dry condition, defibrated in a disk refiner.
  • the use of a disk refiner as disintegrator in the production of fluff according to the present invention has proved to be very advantageous not only econoniically but also purely technically because disk refiners deliver a pulp containing only 10-15 percent' of fiber bundles which is much lower than in previously known methods in spite of the fact that a harder pressed pulp is used as starting material.
  • disk refiner means an apparatus for disintegrating pulp comprising two opposite milling disks of which one is rotating and the other: commonly fixed.
  • the opposite surfaces of the milling disks have milling means in the form of substantially radial and/or transverse bars, projections or similar.
  • the pulp to be treated is-fed through an opening at the center of the fixed milling disk into a central feeding chamber which is formed by opposite recesses in the central part. of the d'uks whereby the distance between the disks is greater in the central part and successively decreases outwards to turn into a rather narrow gap having parallel sides along the outer parts of the disks.
  • Pulp is fed from the chamber outwards through the gap between the outer parts of I the two disks.
  • a distributor e.g.
  • the pulp in the form of a spider, is usually mounted on the rotating disk in the feeding chamber to feed the pulp outwards. 1n the gapbetween the milling disks the pulp is subjected to the desired disintegration and is then fed peripherally in order to be removed through an opening in the housing surrounding the milling disks.
  • the width of the gap is adjustable by axial displacement of one of the milling disks whereby the effect of the treatment can be controlled.
  • the milling means ought to be substantially radial bars of substantially constant height over the fiat part of the disk;
  • the substantially radial bars should not run into each other near the center of the milling disk, the interspaces between them should instead be open inwards.
  • Milling disks of the type which have short tooth shaped projections both in radial and peripheral direction and those having only peripheral bars have proved to be unsuitable for the invention as they are easily blocked and the pulp is burnt so that it sticks to the disks.
  • the width of the gap between the milling disks measured where the surfaces of the milling means are nearest each other is important for achieving a good result.
  • the width of the gap should be from 0.1 to 5 mm., preferably 0.5-3 mm.
  • the percentage of fiber bundles in the resulting fluff decreases with decreasing value of the width of the gap but the fiber cutting increases on the other hand wherefore a distance less than 0.1 mm. gives a disadvantageously high percentage of shortfibered pulp in the fluff and therewith lower bulk and somewhat poorer absorption characteristics.
  • the width of the gap exceeds 5 mm. the percentage of fiber bundles increases in an unacceptable degree.
  • the number of revolutions of the rotating milling disk should be 500-2000 r.p.m., preferably 1000-1800 r.p.m.
  • the sheet pulp is subjected to shredding before being disintegrated in the disk refiner.
  • This treatment may be carried out in any suitable shredder.
  • a specially suitable type of shredder is the hammer-type mill or the pin-type mill.
  • Such a shredder comprises a rotor with fixed or movable hammer-shaped milling means which operate against a fixed strainer.
  • Shredders of this type have earlier been employed for the shredding of bark, pieces of wood, waste cardboard and waste paper and the like and have provided suitable for achieving a shredded pulp which can be fed to the refiner.
  • the shredder should be provided with a strainer which does not let through too great pieces of pulp so that a suitable degree of shredding is achieved.
  • the openings in the strainer should preferably be 1-5 cm., especially 2-3 cm.
  • FIG. 2 A suitable shredder is shown in FIG. 2. It is provided with a rotor 7 having fixed or hinged hammers 8 which operate against a strainer through which the shredded pulp falls.
  • the strainer should have openings from 1 to cm. and is preferably formed of curved rods mounted parallel to the main axis of the rotor and of transverse rods.
  • FIG. 3 shows diagrammatically a disk refiner comprising a housing 10, a fixed milling disk 11 and a rotatable milling disk 12.
  • the pulp is fed through an inlet 13 and is distributed by means of a spider 14 mounted on the rotating milling disk.
  • the resulting fluff is removed through the peripheral outlet 15.
  • FIG. 4 A suitable embodiment of the milling disks is shown in FIG. 4.
  • the shown milling disk has radial bars 16 of varying lengths with suitably inwards open interspaces and transverse bars 17 suitably with inwards decreasing height as being mentioned above.
  • FIG. 5 shows in larger scale a cross section of two milling disks illustrating the form of the radial bars 16.
  • the width of the manufacture are enlarged. it is for instance possible to mix percent spruce pulp with 50 percent semichemical birch pulp and get lower raw material costs.
  • Suitable starting materials for the method according to the present invention. are spruce sulfite pulp, spruce sulfate pulp, pine sulfate pulp, pine sulfite pulp, birch sulfate pulp mixed with spruce or pine sulfite or sulfate pulp, eucalyptus sulfate pulp etc.
  • EXAMPLE '1 A spruce sulfite pulp having a refinement degree ofRl8-83. l and a dry content of 90 percent was treated according to the invention.
  • the speed of rotation of the disk in the refiner was about 1500 r.p.m.
  • the milling means were radial bars having a height of 8 mm. in the milling zone and a distance from each other of 10 mm. at the periphery.
  • the height of the transverse bars was 8 mm. at the periphery and 4 mm. in the middle of the milling zone.
  • the space between the milling means on the two disk was varied so that it amounted to 0.5, 1.0, 2.0 and 3.0 mm. respectively.
  • the obtained fluff was tested on bulk and absorption characteristics, content of fiber bundles (percent) and fiber length distribution (according to the Bauer-Mc Nett-method described in Svensk Papperstidning 68 (1965), p. 230).
  • the obtained results are given in table 1 below in which table also the characteristics for the starting pulp and from this by conventional method using a hammer mill produced flufi are given.
  • the content of fiber bundles is a measure of fiber agglomerates which do not pass a screen having a mesh of 3 mm.
  • the process according to the the milling disks is in the following referred to as the disk present invention makes it possible to produce adisintegrated spa dry cellulose having a fiber distribution equivalent to the one Roll pulp is only produced by a few manufacturers which is Obtained y the convemmnal method but improved pa disadvantage and only from long-fibered pulp, i.e. spruce tron characteristics and weight by volume and a considerably pulp.
  • the process according to the invention makes it possible l'edlwed Content of fiber bundles- Moreover, y using Sheet to use any type of pulp provided that it contains or h h pulp the costs of the produced disintegratedcellulose are remixing with another pulp is brought to contain enough longmarkably reducedfibered material, which is necessary for the absorption characteristics of the obtained fluff.
  • the pulp being fed into the EXAMPLE shredder should contain at least 50 percent of long-fibered A pine sulfate pulp having a refinement degree of Rl8-83.7 material, i.e. material having an average fiber length of about d a d i h f 94 percent was tr t d according t the l mm.
  • rotation of the rotating milling disk is within the range from about 500 to about 2000 r.p.m.
  • a process for producing disintegrated dry cellulose fibers from cut pulp sheets which comprises shredding dry cut pulp sheets having a dry content above about 85 percent by weight into particles, entraining the shredded pulp particles in a stream of carrier gas, transporting the gas-entrained particles to the gap between two milling disks of which one is fixed and one is rotatable, the width of the gap being within the range from about 0.1 to about mm., subjecting the particles while in said gap to milling by the milling disks until the shredded pulp particles are disintegrated, and the fibers liberated, and then removing the disintegrated pulp fibers peripherally from the gap while entrained in the gas stream.
  • milling disks are provided with milling means in the form of substantially radial and transverse bars or projections.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US660451A 1966-08-17 1967-08-14 Process for disintegrating dry cellulose pulp Expired - Lifetime US3596840A (en)

Applications Claiming Priority (1)

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SE11152/66A SE320876B (es) 1966-08-17 1966-08-17

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US (1) US3596840A (es)
BE (1) BE702749A (es)
CH (1) CH460518A (es)
DK (1) DK117676B (es)
FI (1) FI53002B (es)
GB (1) GB1129695A (es)
NL (1) NL6711311A (es)
SE (1) SE320876B (es)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3802630A (en) * 1971-10-13 1974-04-09 Int Paper Co Process for utilizing high-density pulp in fluff
US3804340A (en) * 1971-07-13 1974-04-16 Mo Och Domsjoe Ab Method and apparatus for producing dry-defibrated cellulose
US4036679A (en) * 1975-12-29 1977-07-19 Crown Zellerbach Corporation Process for producing convoluted, fiberized, cellulose fibers and sheet products therefrom
DE2708307A1 (de) * 1977-02-25 1978-08-31 Vn Proizv Ob Celljuloszno Verfahren zur herstellung von zellulosefasern aus einem zellulosehaltigen halbstoff und anlage zur durchfuehrung des verfahrens
US4125493A (en) * 1977-04-01 1978-11-14 The Gates Rubber Company Fibrated admix or polymer and process therefore
US4191335A (en) * 1979-01-08 1980-03-04 Westvaco Corporation Dry refining process and apparatus
DE3345623A1 (de) * 1982-12-20 1984-06-20 Kimberly-Clark Corp., Neenah, Wis. Verfahren zur entfernung von druckfarbe aus sekundaerfaserquellen, sekundaerfasern und verfahren zur herstellung von papier unter deren verwendung
WO1986002116A1 (en) * 1984-10-01 1986-04-10 Dalkiaer Peter A process for manufacturing a liquid absorbing pad, in particular for use in soft hygiene articles and sanitary products
US4668339A (en) * 1983-11-22 1987-05-26 Kimberly-Clark Corporation Process for dry deinking of secondary fiber sources
US5906894A (en) * 1994-03-25 1999-05-25 Weyerhaeuser Company Multi-ply cellulosic products using high-bulk cellulosic fibers
WO2000029665A1 (en) * 1998-11-16 2000-05-25 Pragmatic Vision, Inc. Device for defibrating fibrous sheets
US6120648A (en) * 1994-11-21 2000-09-19 Thermo Black Clawson Inc. Apparatus for pulping and deinking
US20050045297A1 (en) * 2003-08-28 2005-03-03 Philip Morris Usa, Inc. Method and apparatus for preparing a slurry of add-on material to be applied to a web
US20100304440A1 (en) * 2008-04-30 2010-12-02 Xyleco, Inc. Processing biomass
US20120100577A1 (en) * 2010-10-20 2012-04-26 Xyleco, Inc. Processing biomass
US20130037635A1 (en) * 2011-08-09 2013-02-14 Anirudh Singh Process for defiberizing pulp
US8716537B2 (en) 2008-04-30 2014-05-06 Xyleco, Inc. Processing biomass
CN111535064A (zh) * 2020-04-17 2020-08-14 华夏瑞天(北京)生物科技有限公司 一种利用含水溶性硅素的工业废水制备生态纤维的方法及应用

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3475791A (en) * 1967-05-08 1969-11-04 Johnson & Johnson Method for separating,conveying and collecting woodpulp fibers as a uniform layer and apparatus for carrying out the same
FI81642C (fi) * 1988-05-20 1990-11-12 Yhyneet Paperitehtaat Oy Walki Matarsystem foer en former vid en torrpappersmaskin.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1880045A (en) * 1930-05-24 1932-09-27 Brown Co Paper manufacture
US2035994A (en) * 1934-10-03 1936-03-31 Jr Daniel Manson Sutherland Fiber refining and refiner
US2364721A (en) * 1942-06-03 1944-12-12 Libbey Owens Ford Glass Co Method of producing fine wood flour
US2444929A (en) * 1946-01-07 1948-07-13 Weyerhauser Timber Company Method of treating bark
US2513344A (en) * 1946-09-19 1950-07-04 Buffalo Electro Chem Co Method of bleaching high-density pulp

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1880045A (en) * 1930-05-24 1932-09-27 Brown Co Paper manufacture
US2035994A (en) * 1934-10-03 1936-03-31 Jr Daniel Manson Sutherland Fiber refining and refiner
US2364721A (en) * 1942-06-03 1944-12-12 Libbey Owens Ford Glass Co Method of producing fine wood flour
US2444929A (en) * 1946-01-07 1948-07-13 Weyerhauser Timber Company Method of treating bark
US2513344A (en) * 1946-09-19 1950-07-04 Buffalo Electro Chem Co Method of bleaching high-density pulp

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3804340A (en) * 1971-07-13 1974-04-16 Mo Och Domsjoe Ab Method and apparatus for producing dry-defibrated cellulose
US3802630A (en) * 1971-10-13 1974-04-09 Int Paper Co Process for utilizing high-density pulp in fluff
US4036679A (en) * 1975-12-29 1977-07-19 Crown Zellerbach Corporation Process for producing convoluted, fiberized, cellulose fibers and sheet products therefrom
DE2708307A1 (de) * 1977-02-25 1978-08-31 Vn Proizv Ob Celljuloszno Verfahren zur herstellung von zellulosefasern aus einem zellulosehaltigen halbstoff und anlage zur durchfuehrung des verfahrens
US4125493A (en) * 1977-04-01 1978-11-14 The Gates Rubber Company Fibrated admix or polymer and process therefore
US4191335A (en) * 1979-01-08 1980-03-04 Westvaco Corporation Dry refining process and apparatus
DE3345623A1 (de) * 1982-12-20 1984-06-20 Kimberly-Clark Corp., Neenah, Wis. Verfahren zur entfernung von druckfarbe aus sekundaerfaserquellen, sekundaerfasern und verfahren zur herstellung von papier unter deren verwendung
US4668339A (en) * 1983-11-22 1987-05-26 Kimberly-Clark Corporation Process for dry deinking of secondary fiber sources
WO1986002116A1 (en) * 1984-10-01 1986-04-10 Dalkiaer Peter A process for manufacturing a liquid absorbing pad, in particular for use in soft hygiene articles and sanitary products
US5906894A (en) * 1994-03-25 1999-05-25 Weyerhaeuser Company Multi-ply cellulosic products using high-bulk cellulosic fibers
US6120648A (en) * 1994-11-21 2000-09-19 Thermo Black Clawson Inc. Apparatus for pulping and deinking
WO2000029665A1 (en) * 1998-11-16 2000-05-25 Pragmatic Vision, Inc. Device for defibrating fibrous sheets
US20050045297A1 (en) * 2003-08-28 2005-03-03 Philip Morris Usa, Inc. Method and apparatus for preparing a slurry of add-on material to be applied to a web
US8142620B2 (en) * 2008-04-30 2012-03-27 Xyleco, Inc. Processing biomass
US9132407B1 (en) 2008-04-30 2015-09-15 Xyleco, Inc. Processing biomass
US10533195B2 (en) 2008-04-30 2020-01-14 Xyleco, Inc. Processing biomass
US9968905B2 (en) 2008-04-30 2018-05-15 Xyleco, Inc. Processing biomass
US8716537B2 (en) 2008-04-30 2014-05-06 Xyleco, Inc. Processing biomass
US8946489B2 (en) 2008-04-30 2015-02-03 Xyleco, Inc. Processing biomass
US9062328B2 (en) 2008-04-30 2015-06-23 Xyleco, Inc. Processing biomass
US20100304440A1 (en) * 2008-04-30 2010-12-02 Xyleco, Inc. Processing biomass
US9187769B1 (en) 2008-04-30 2015-11-17 Xyleco, Inc. Processing biomass
US9278896B1 (en) 2008-04-30 2016-03-08 Xyleco, Inc. Processing biomass
US9283537B2 (en) 2008-04-30 2016-03-15 Xyleco, Inc. Processing biomass
US20120100577A1 (en) * 2010-10-20 2012-04-26 Xyleco, Inc. Processing biomass
US20130037635A1 (en) * 2011-08-09 2013-02-14 Anirudh Singh Process for defiberizing pulp
CN111535064A (zh) * 2020-04-17 2020-08-14 华夏瑞天(北京)生物科技有限公司 一种利用含水溶性硅素的工业废水制备生态纤维的方法及应用
CN111535064B (zh) * 2020-04-17 2022-03-22 华夏瑞天(北京)生物科技有限公司 利用含水溶性硅素的工业废水制备生态纤维的方法及应用

Also Published As

Publication number Publication date
DE1561638A1 (de) 1972-02-10
SE320876B (es) 1970-02-16
FI53002B (es) 1977-09-30
GB1129695A (en) 1968-10-09
DK117676B (da) 1970-05-19
BE702749A (es) 1968-01-15
CH460518A (de) 1968-07-31
NL6711311A (es) 1968-02-19

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