US3750962A - Disintegration process for fibrous sheet material - Google Patents

Disintegration process for fibrous sheet material Download PDF

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Publication number
US3750962A
US3750962A US00182796A US3750962DA US3750962A US 3750962 A US3750962 A US 3750962A US 00182796 A US00182796 A US 00182796A US 3750962D A US3750962D A US 3750962DA US 3750962 A US3750962 A US 3750962A
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US
United States
Prior art keywords
sheet
sheet material
fibrous sheet
drylap
tips
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00182796A
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English (en)
Inventor
G Morgan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
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Procter and Gamble Co
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Filing date
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Publication of US3750962A publication Critical patent/US3750962A/en
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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

  • ABSTRACT A process for continuously converting dried cellulosic fibrous sheet material into a dispersion of individual fibers in air.
  • the fibrous sheet is advanced into a disintegrating device wherein the end of the sheet is repeatedly impacted at a predetermined velocity by one or more impacting elements at a critical distance from the support elements for the sheet.
  • the fibrous sheet is entirely disintegrated into individual fibers at relatively high rates.
  • the principal object of the present invention is to improve the operation of the prior art device of US. Pat. No. 3,519,2l1.
  • Another object of the present invention is the provision of a process for disintegrating dried cellulosic fibrous sheet material into individual cellulose fibers in such a way as to minimize the scorching and burning of the fibers.
  • Still another object of the present invention is the provision of a disintegration process for fibrous sheet material which increases the capacity and efficiency of the previously known processes and apparatus of this kind without need for artificial cooling.
  • the nature and substance of the invention can be briefly summarized as comprising a process for converting dried cellulosic fibrous sheet material into a dispersion of individual fibers in air.
  • the fibrous sheet material is fed inwardly to a disintegrating device having a plurality of impacting elements.
  • the fibrous sheet is advanced continuously between support elements for the sheet such that its end is disintegrated by the impact of the tips of the impacting elements on the free end of the sheet at a distance of from about 0.020 in. to about 0.050 in. from the end of the support elements.
  • the sheet is advanced at a relatively constant rate between successive impacts.
  • the fibers are freed from the cellulosic sheet whereupon they are dispersed in air and conducted away from the impact zone of disintegration by way of unobstructed passageways.
  • Such drylap sheets are typically between about 100 and about 200 pounds 1,000 ft. 2 basis weight, and generally have a caliper of at least about 0.04 inch or greater, e.g., from about 0.04 to about 0.06.
  • a drylap sheet of this type usually has a moisture content of less than about percent, e.g.,
  • dried cellulosic fibrous sheet describes any type of fibrous-sheet material capable of disintegration by the process of the invention.
  • a drylap sheet will be understood to mean a wood-fiber material of the above described characteristics to which the invention is preferably applied.
  • a roll 11 of drylap sheet material is unrolled into a web of sheet material 12 which is advanced to the disintegrator 13.
  • the sheet 12 is fed radially into the disintegrator 13.
  • a pair of metering infeed rolls l4 and 15 are mounted on one side of the disintegrator 13.
  • a motive power source which may typically be an electric motor is connected to the rolls in a conventional manner, to provide a driving force.
  • the disintegrator 13 comprises a casing 16 having a generally cylindrical bore".
  • the internal configuration of the casing 16 is not critical to the practice of the invention and it will be understood that a-cylindrical bore is shown in the preferred embodiment only as a matter of convenience.
  • a shaft 18 is joumaled in the casing such that one end extends outside the casing to permit coupling the shaft in some conventional manner to a motive source such as an electric motor. The motor continuously drives the shaft 18.
  • the casing 16 is provided with a slotted inlet opening 19 to receive the drylap sheet 12.
  • a relatively large discharge outlet 20 is provided in the bottom of the casing 16.
  • An air inlet opening 21 is provided near the discharge outlet 20 to permit air to be forced into the casing at a slight positive pressure from a suitable blower (not shown) or the like, for the purpose of preventing recycling of the fibers through the disintegrator. Additional air inlets 21a can be provided as necessary to carry out the function of adjusting the air flow.
  • Rotors 22 are keyed to the shaft 18 and are provided with a plurality of teeth 23 extending radially outwardly which serve as impacting elements 24. A critical small clearance is provided between the teeth 23 and the supports for the sheet 12 at the inner end 19a of the inlet opening 19. The inner end 19a forms a sheet support for the sheet 12.
  • successive teeth 23 impact the ends of the sheet 12 as the rotor 22 is turned.
  • the path of travel and the manner of supporting the teeth 23 is not critical to the practice of the invention. The only necessary requirement is that the teeth 23 are moved such that their tips 24 impact the sheet 12 with at least one force component normal or perpendicular to the free ends of the sheets as the tips move past the sheet support 19a.
  • the clearance between the tips 24 and the edge of the sheet support 19a should be maintained within a range of from about 0.023 in. to about 0.050 in.
  • this clearance is from about 0.027 in. to about 0.033 in. and most preferably about 0.028 in.
  • the gap range below about 0.035 is especially desirable with dry lap feed rates of from about 30 100 fpm where with this gap distance range there is essentially no scorching. With larger gap sizes there is scorching with these drylap feed rates unless auxilliary cooling means, e.g., a water spray, are provided; and with gaps smaller than about 0.023 in. the disintegration quality is much poorer. With higher feed rates gap sizes closer to 0.050 in.
  • the impact on the free end of the sheet material is preferably controlled by turning the rotor such that the impact velocity of the tips 24 is at least about 6,000 feet per minute, although an impact speed of at least about 12,000 feet per minute is preferred. About 15,500 feet per minute has been found to be a most desirable impact velocity. Velocities in excess of about 30,000 feet per minute are not practical with presently available materials.
  • the individual disintegrated fibers which have been disengaged from the sheet 12 are removed from the impact zone whereupon they are dispersed and discharged from the casing 16 by air flow and/or the velocity imparted to the fibers by the teeth 23.
  • the air flow is generated, at least in part, by rotation of the rotor, although it can be supplemented significantly by forced air flow into the casing from the inlet 21.
  • the individual fibers are removed at the discharge outlet 20 from where they can be conducted to a suitable collecting device.
  • a process for disintegrating dried cellulosic fibrous sheet material comprising the steps of feeding a fibrous sheet into a disintegrator comprising a casing, supporting said sheet in a slotted opening terminating in a sheet support in said casing, moving a plurality of impacting elements having tips so that the tips move at a velocity of at least about 6,000 feet per minute, and impacting said tips against the end of the fibrous sheet so that impact is substantially normal to the plane of the sheet whereby said fibrous sheet is disintegrated into individual fibers, the tips of said impacting elements moving past the sheet at a distance from the end of the sheet support of from about 0.023 in. to about 0.050 in., said distance being from about 0.023 in. to about 0.035 in.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Nonwoven Fabrics (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)
US00182796A 1971-09-22 1971-09-22 Disintegration process for fibrous sheet material Expired - Lifetime US3750962A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18279671A 1971-09-22 1971-09-22

Publications (1)

Publication Number Publication Date
US3750962A true US3750962A (en) 1973-08-07

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ID=22670079

Family Applications (1)

Application Number Title Priority Date Filing Date
US00182796A Expired - Lifetime US3750962A (en) 1971-09-22 1971-09-22 Disintegration process for fibrous sheet material

Country Status (17)

Country Link
US (1) US3750962A (xx)
JP (1) JPS5225445B2 (xx)
AT (1) AT320417B (xx)
AU (1) AU459658B2 (xx)
BE (1) BE789034A (xx)
CA (1) CA976320A (xx)
CH (1) CH544582A (xx)
DE (1) DE2245936C2 (xx)
DK (1) DK133606B (xx)
ES (1) ES406759A1 (xx)
FI (1) FI56565C (xx)
FR (1) FR2154195A5 (xx)
GB (1) GB1389606A (xx)
IE (1) IE36902B1 (xx)
IT (1) IT967713B (xx)
NL (1) NL7212810A (xx)
NO (1) NO142450C (xx)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388056A (en) * 1981-07-06 1983-06-14 The Procter & Gamble Company Apparatus for continuously making an air-laid fibrous web having patterned basis weight distribution
EP0169174A2 (en) * 1984-06-20 1986-01-22 FAMECCANICA S.p.A. Apparatus for the dry defibration of sheets of fibrous cellulose material and like materials, particularly for the preparation of absorbent masses for disposable nappies and the like
US4650127A (en) * 1985-01-31 1987-03-17 Kimberly-Clark Corporation Method and apparatus for fiberizing fibrous sheets
US5253815A (en) * 1990-10-31 1993-10-19 Weyerhaeuser Company Fiberizing apparatus
US5324391A (en) * 1990-10-31 1994-06-28 Weyerhaeuser Company Method for crosslinking cellulose fibers
US5437418A (en) * 1987-01-20 1995-08-01 Weyerhaeuser Company Apparatus for crosslinking individualized cellulose fibers
US5556976A (en) * 1987-01-20 1996-09-17 Jewell; Richard A. Reactive cyclic N-sulfatoimides and cellulose crosslinked with the imides
US6059924A (en) * 1998-01-02 2000-05-09 Georgia-Pacific Corporation Fluffed pulp and method of production
US6517017B1 (en) * 2001-08-07 2003-02-11 Masco Corporation End mill fiber chopper
US20120097351A1 (en) * 2010-01-06 2012-04-26 Sustainable Health Enterprises (She) Highly absorbent and retentive fiber material

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2708307C2 (de) * 1977-02-25 1983-04-28 Vsesojuznoe naučno-proizvodstvennoe ob"edinenie celljulozno-bumažnoj promyšlennosti, Leningrad Verfahren zum Zerfasern einer aus Zellstoff bestehenden Bahn und Vorrichtung zur Durchführung des Verfahrens
US4241881A (en) * 1979-07-12 1980-12-30 Kimberly-Clark Corporation Fiber separation from pulp sheet stacks
JP4596520B2 (ja) * 2004-08-25 2010-12-08 株式会社リブドゥコーポレーション パルプ粉砕装置
CN111778588B (zh) * 2020-06-03 2022-09-13 艾达索高新材料芜湖有限公司 一种单向碳纤维边角料机械回收方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1417961A (en) * 1920-10-07 1922-05-30 Williams Patent Crusher & Pulv Method of reducing fibrous sheet material
US2812790A (en) * 1954-10-04 1957-11-12 Hercules Powder Co Ltd Preparation of shredded wood pulp
US2830772A (en) * 1954-02-24 1958-04-15 Johns Manville Nodulator for mineral wool
US3519211A (en) * 1967-05-26 1970-07-07 Procter & Gamble Disintegration process for fibrous sheet material

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1417961A (en) * 1920-10-07 1922-05-30 Williams Patent Crusher & Pulv Method of reducing fibrous sheet material
US2830772A (en) * 1954-02-24 1958-04-15 Johns Manville Nodulator for mineral wool
US2812790A (en) * 1954-10-04 1957-11-12 Hercules Powder Co Ltd Preparation of shredded wood pulp
US3519211A (en) * 1967-05-26 1970-07-07 Procter & Gamble Disintegration process for fibrous sheet material

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4388056A (en) * 1981-07-06 1983-06-14 The Procter & Gamble Company Apparatus for continuously making an air-laid fibrous web having patterned basis weight distribution
EP0169174A2 (en) * 1984-06-20 1986-01-22 FAMECCANICA S.p.A. Apparatus for the dry defibration of sheets of fibrous cellulose material and like materials, particularly for the preparation of absorbent masses for disposable nappies and the like
EP0169174A3 (en) * 1984-06-20 1987-01-21 Fameccanica S.P.A. Apparatus for the dry defibration of sheets of fibrous cellulose material and like materials, particularly for the preparation of absorbent masses for disposable nappies and the like
US4650127A (en) * 1985-01-31 1987-03-17 Kimberly-Clark Corporation Method and apparatus for fiberizing fibrous sheets
US5437418A (en) * 1987-01-20 1995-08-01 Weyerhaeuser Company Apparatus for crosslinking individualized cellulose fibers
US5556976A (en) * 1987-01-20 1996-09-17 Jewell; Richard A. Reactive cyclic N-sulfatoimides and cellulose crosslinked with the imides
US6436231B1 (en) 1987-01-20 2002-08-20 Weyerhaeuser Method and apparatus for crosslinking individualized cellulose fibers
US5324391A (en) * 1990-10-31 1994-06-28 Weyerhaeuser Company Method for crosslinking cellulose fibers
US5253815A (en) * 1990-10-31 1993-10-19 Weyerhaeuser Company Fiberizing apparatus
US6059924A (en) * 1998-01-02 2000-05-09 Georgia-Pacific Corporation Fluffed pulp and method of production
US6517017B1 (en) * 2001-08-07 2003-02-11 Masco Corporation End mill fiber chopper
US20120097351A1 (en) * 2010-01-06 2012-04-26 Sustainable Health Enterprises (She) Highly absorbent and retentive fiber material
US8936697B2 (en) * 2010-01-06 2015-01-20 Sustainable Health Enterprises Highly absorbent and retentive fiber material
US20150152597A1 (en) * 2010-01-06 2015-06-04 Sustainable Health Enterprises (She) Highly absorbent and retentive fiber material
US9365972B2 (en) * 2010-01-06 2016-06-14 Sustainable Health Enterprises (She) Highly absorbent and retentive fiber material

Also Published As

Publication number Publication date
DE2245936C2 (de) 1983-02-24
JPS5225445B2 (xx) 1977-07-07
CH544582A (de) 1973-11-30
BE789034A (fr) 1973-03-20
NO142450B (no) 1980-05-12
FI56565C (fi) 1980-02-11
FR2154195A5 (xx) 1973-05-04
NO142450C (no) 1980-08-20
AT320417B (de) 1975-02-10
DK133606C (xx) 1976-11-01
JPS4872401A (xx) 1973-09-29
CA976320A (en) 1975-10-21
ES406759A1 (es) 1975-10-01
IE36902L (en) 1973-03-22
DK133606B (da) 1976-06-14
FI56565B (fi) 1979-10-31
NL7212810A (xx) 1973-03-26
AU4659772A (en) 1974-03-21
IT967713B (it) 1974-03-11
IE36902B1 (en) 1977-03-16
GB1389606A (en) 1975-04-03
DE2245936A1 (de) 1973-03-29
AU459658B2 (en) 1975-04-10

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