US3804340A - Method and apparatus for producing dry-defibrated cellulose - Google Patents

Method and apparatus for producing dry-defibrated cellulose Download PDF

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Publication number
US3804340A
US3804340A US00271101A US27110172A US3804340A US 3804340 A US3804340 A US 3804340A US 00271101 A US00271101 A US 00271101A US 27110172 A US27110172 A US 27110172A US 3804340 A US3804340 A US 3804340A
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United States
Prior art keywords
bale
cutting
pulp
knife
accordance
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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
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US00271101A
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English (en)
Inventor
K Ekman
N Blomqvist
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.)
FIBRE CONVERTING MACHINERY AB
Original Assignee
Mo och Domsjo AB
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Assigned to FIBRE CONVERTING MACHINERY AB reassignment FIBRE CONVERTING MACHINERY AB ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: MO OOCH DOMSJO AB
Anticipated expiration legal-status Critical
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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/566—Interrelated tool actuating means and means to actuate work immobilizer
    • Y10T83/5815—Work-stop abutment
    • Y10T83/5842—Stop partakes of tool motion
    • Y10T83/5851—Carried by tool or tool support

Definitions

  • ABSTRACT Method and apparatus are provided for producing dry disintegrated cellulose pulp such as cellulose fluff from bales of cellulose pulp in sheet form, by cutting the pulp sheets in the bale into strips while still located in the bale, and thereafter defibrating the strips, with an optional intermediate shredding step prior to defibrating.
  • the present .invention relates to a method and an apparatus for producing dry-disintegrated (fluffed) cellulose pulp from bales of cellulose pulp in sheet form.
  • individual sheets of pulp are normally separated from the bale and then shredded into small pieces, which are later disintegrated.
  • Known apparatus hitherto used for this purpose normally include a shredder, which breaks the pulp sheets down into coin-size pieces, and means for defibrating (fluffing) the shredded pulp.
  • the shredder is normally in the form of a hammer mill. To avoid overheating of the shredder and also ignition of the pulp sheets during the shredding process, it is necessary to feed the sheets of pulp separately to the shredder.
  • One serious disadvantage with this method of feeding the pulp to the shredder is that the sheets of pulp often stick firmly together in the bale and can only be separated with great diffiwhy, or cannot be separated at all without disintegrating.
  • the invention relates to a method for producing dry-defibrated cellulose pulp (so-called fluff) from bales of cellulose pulp in sheet form and is mainly characterized by the fact that the pulp sheets are cut into strips while still located in the bale, after which the severed pulp strips are optionally shredded in a shredding device and the shredded pulp or pulp strips defibrated in a defibrating means.
  • fluff dry-defibrated cellulose pulp
  • the invention also relates to an apparatus for carrying out the method.
  • the apparatus is characterized by a combination of means for cutting the pulp bales into strips, means for feeding thebales to the cutting means, and when desiredto a shredding means for shredding the pulp stripscutin the cutting means into smaller pieces, and means fordefibrating the pulp strips or the shredded pulp pieces.
  • FIG. 1 is a side view of the apparatus according to the invention, comprising a cutting means, a shredding means and a defibrating means, the Figure also illustrating a consumer system for the defibrated cellulose pulps,
  • FIG. 2 illustrates the cutting means provided with knife means anda stop, seen from the shredding means
  • FIG. 3 illustrates the cutting means with the knife means and stop during a downward movement when cutting strips from a bale of pulp sheets
  • FIG. 4 illustrates the cutting means with the knife means and stop in a lower turn or limit position.
  • the reference numeral 1 indicates a cutting means, 2 a shredding means and 3 a defibrating means.
  • the cutting means 1 and the shredding means 2 are connected together by means of an obliquely upwardly extending belt conveyor 4 provided with guide edges, while the shredding means 2 is connected to the defibrating means 3 by means of a screw conveyor 5.
  • the cutting means 1 comprises an endless belt conveyor 6, a knife means 7 having a downwardly directed cutting edge 8, a stop 9, a press 10 and a press table 11 arranged externally of the conveyor 6 in the conveying direction, the cutting edge 8 having a bevelled surface facing towards the stop 9.
  • the knife means and the stop are fixedly mounted on a bracket structure 12 (FIG.
  • bracket structure 12 with the knife means and the stop are arranged at the end of the press table 11 adjacent the conveyor 4 for movement between an upper and a lower turn or limit position. In the upper limit position, the bracket structure 12 is located with the upper edge of the stop 9 slightly above a bale 13 of pulp sheets located on the conveyor 6 and the press table 11 (FIG. I). When the bracket structure occupies its lower limit position, the edge of the knife means bears against a plastic member 14 let into the press table 11 and ex tending transversely across the whole width of the press table.
  • the purpose of the plastic member 14 is to enable the knife means to cut throughthe lowermost sheet in a bale lying on the press table (as will be described hereinafter).
  • the bracket structure 12 is connected to a drive mechanism (not shown), which drives the bracket structure between its limit positions.
  • the press 10 is movably arranged adjacent the movement path of the knife means 7 and serves to urge a bale lying on the press table 11 against the press table, thereby to facilitate cutting of the knife means through the bale.
  • the movement of the press and the movement of the bracket structure 12 are synchronized with each other in a manner such that the press holds the bale firmly pressed against the press table, with the exception of the time during which the whole of the knife means is located above the bale.
  • a receiving bin 15 (FIG. 1) is arranged above the belt conveyor 4 at the input end of and immediately adjacent the movement path of the stop 9.
  • the shredding means 2 comprises a hammer mill and the defibrating means 3 a disc refiner.
  • the defibrating means is connected to a sheet feed roll and conveyor assembly 17 for manufacturing diapers.
  • the shredding means 2, the defibrating means 3, the diaper manufacturing assembly 17 and the conveyors 4 and 5 are only illustrated diagrammatically in the Figure.
  • the illustrated apparatus operates in the following manner. Subsequent to moving the press 10 and the bracket structure 12 with the knife means 7 and stop 9 to the upper limit position, the shredding means 2, the defibrating means 3, the conveyors 4, 5 and-6 and the diaper manufacturing assembly 17 are set into operation. A number of bales 13 of pulp sheets are then supplied sequentially to the conveyor 6 at its in-feed end. The bales are successively moved by the conveyor in the direction of the arrow A (FlGS. l, 3 and 4) until the major portion of the first bale in the line is located on the press table 11, where it is stopped by the stop 9. The following bales are then stopped in sequence by the preceding bales, until the row of bales is at rest on the conveyor.
  • the bales are constantly held pressed against each other and the stop 9.
  • the means driving the bracket structure 12 and the press are then started up, whereupon the press moves downwards into abutment with the bale lying on the press table 11 and presses the bale firmly against the press table.
  • the knife means and the stop 9 move towards the lower limit position.
  • the sheets of pulp in the bale clamped between the press 10 and the press table 11 are cut into strips (indicated at 18 in FIG. 3). In the lower limit position of the bracket structure 12, the cutting edge.
  • the width of the strips corresponds to the horizontal distance between the knife means and the stop. Since the vertical distance between the knife means and the stop is always constant and since the bevelled or chamfered surface of the knife edge is turned towards the stop, the pulp strips are thrown out between the knife means and the stop, down into the receiving bin 15 (FIG. 1) as they are cut by the knife means. The strips of pulp fall, via the receiving bin, down onto the belt conveyor 4, which transports the strips to the shredding means 2.
  • the knife means 7 When the bracket structure 12 has reached its lower limit position, the knife means 7 has cut a strip of pulp from each sheet in the front bale. Thus, when a strip has been cut from the bale, the bale and similarly the remaining bales in the row of bales on the conveyor 6 is no longer supported by the stop 9, but lies instead against the rear side of the knife means 7, which together with the press 10 prevents the bales from moving in the feed direction.
  • the bracket structure 12 Immediately after the bracket structure 12 has reached the lower limit position, it turns and moves upwardly. During this upward movement, the knife means 7 slides with its rear side surface against the front bale. When the knife means has moved clear of the bale, the press 10 moves upwards, away from the bale.
  • bales are therefore automatically moved by the continuously operating conveyor 6 until the front bale again bears against the'stop 9, whereupon movement of the bales ceases.
  • the distance moved by the bales corresponds to the horizontal distance between the edge of the knife means and the rear side surface of the stop, i.e. the width of each strip cut from the bale.
  • the shredding means 2 may be in the form of a hammer mill, but that any suitable shredding means may be used.
  • the shredding means may be of the type which includes a rotatable roll provided with shredding members and an anvil suitably constructed for the roll.
  • the defibrating means 3 may also differ from the illustrated example and the disc refiner of the exemplary machine may suitably be replaced with a peg mill or hammer mill provided with grinding means for pulp defibrating purposes.
  • the knife means 7 and the stop 9 may also be arranged at other distances apart than those illustrated with the exemplary embodiment.
  • the horizontal distance between the knife means and the stop, corresponding to the width of the cut strips, should, however, not be so great that the strips cannot be readily treated in subsequent machines.
  • the vertical distance between the knife means and the stop should be sufficient to enable the cut strips to be thrown therebetween unhindered.
  • the cutting means can be provided with means by which the horizontal and vertical distance between the knife means and the stop can be regulated, thereby enabling any desired strip width to be set on the machine. This enables the use of shredding means of greatly varying capacity and heat conductivity.
  • the cutting means with means by which the length of the movement of the knife means and the stop 7, 9 can be adjusted to pulp bales of varying height.
  • a system suitable therefor thus includes all the aforementioned means described with reference to the illustrated embodiment of the invention, with the exception of the shredding means and its discharge conveyor.
  • the defibrating means In order for the defibrating means to be able to expose the fibres in the pulp strips, it must comprise a hammer mill provided with a screen of suitable mesh.
  • a method in accordance with claim 1, which comprises cutting off a first series of strips, one strip from each pulp sheet in the bale, in sequence, proceeding across the pulp sheets in the bale, from one side of the bale to the other, while holding the bale in a fixed position, then cutting off a second series of strips from each pulp sheet in the bale in like manner, and continuing until the entire bale has been cut into strips.
  • An apparatus for producing dry defibrated cellulose pulp from bales of cellulose pulp sheet baledin parallel juxtaposed relationship comprising, in combination, means for cutting off strips from the baled sheet pulp, proceeding across the pulp sheets in the bale, from one side of the bale to the other, and means for defibrating the cut strips.
  • An apparatus'in accordance with claim 7, including means for feeding the pulp sheet bale to the cutting means, means for retaining the bale in a position for cutting strips of desired width, and means for feeding the cut pulp sheet strips to the defibrating means.
  • the cutting means comprises a knife with a cutting edge extending across and facing the bale, and movable reciprocably from one side of the bale through the bale to the other side; and means reciprocably movable with the knife and spaced from the knife edge a distance equal to the width of the strip to be cut off, holding the bale in the spaced width position during the cutting.
  • An apparatus in accordance with claim 11, comprising means for feeding a pulp bale to the cutting means; stop means for-arresting movement of a pulp bale conveyed by the feed means in the feed direction when in a position for cutting; and retaining means holding the bale fixed in the cutting position relative to the knife to be cut thereby.
  • An apparatus in accordance with claim 12, comprising means for supporting a bale during the cutting, the retaining means holding the bale against the support means under compression.
  • the support means comprises a supporting surface of a material softer than the cutting knife edge, and arranged to engage the knife edge and serve as a stop for the knife after the knife has cut through the last sheet of the bale in juxtaposition to the supporting surface.
  • An apparatus in accordance with claim 12, comprising drive means operatively synchronizing movement of the knife, bale feeding means, and baleretaining means so that whenever the knife is being reciprocatingly returned to its initial cutting position, after cutting the last pulp sheet in a pulp bale, the pulp bale feed means advances the next bale forward against the stop and the bale-retaining means engages and fixes that bale in a position to be cut by the next cutting movement of the knife.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Paper (AREA)
US00271101A 1971-07-13 1972-07-12 Method and apparatus for producing dry-defibrated cellulose Expired - Lifetime US3804340A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE09076/71A SE355613B (de) 1971-07-13 1971-07-13

Publications (1)

Publication Number Publication Date
US3804340A true US3804340A (en) 1974-04-16

Family

ID=20275771

Family Applications (1)

Application Number Title Priority Date Filing Date
US00271101A Expired - Lifetime US3804340A (en) 1971-07-13 1972-07-12 Method and apparatus for producing dry-defibrated cellulose

Country Status (10)

Country Link
US (1) US3804340A (de)
JP (1) JPS5134482B1 (de)
BE (1) BE786158A (de)
CH (1) CH547393A (de)
DE (1) DE2233340C3 (de)
FR (1) FR2146073A5 (de)
GB (1) GB1385402A (de)
IT (1) IT965102B (de)
NL (1) NL150867B (de)
SE (1) SE355613B (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605604A1 (de) * 1975-02-12 1976-08-26 Joa Curt G Inc Verfahren und vorrichtung zur herstellung von zerfaserten zelluloseflocken
US4146183A (en) * 1976-09-17 1979-03-27 Westvaco Corporation Pressed pulp bale shredder
US5324389A (en) * 1992-06-19 1994-06-28 The Black Clawson Company Waste paper disintegration, classification and pulping system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE469504B (sv) * 1992-03-23 1993-07-19 Dan Brodin Apparat foer soenderdelning av balar

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US282052A (en) * 1883-07-31 Feed-cutter
US2014947A (en) * 1934-09-20 1935-09-17 Rayon Proc Co Coating
US3406916A (en) * 1965-03-02 1968-10-22 Celanese Corp Attrition
US3596840A (en) * 1966-08-17 1971-08-03 Mo Och Domsjoe Ab Process for disintegrating dry cellulose pulp
US3692246A (en) * 1971-06-14 1972-09-19 Williams Patent Crusher & Pulv Fluff preparation system and apparatus

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5038365Y2 (de) * 1971-04-21 1975-11-06

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US282052A (en) * 1883-07-31 Feed-cutter
US2014947A (en) * 1934-09-20 1935-09-17 Rayon Proc Co Coating
US3406916A (en) * 1965-03-02 1968-10-22 Celanese Corp Attrition
US3596840A (en) * 1966-08-17 1971-08-03 Mo Och Domsjoe Ab Process for disintegrating dry cellulose pulp
US3692246A (en) * 1971-06-14 1972-09-19 Williams Patent Crusher & Pulv Fluff preparation system and apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2605604A1 (de) * 1975-02-12 1976-08-26 Joa Curt G Inc Verfahren und vorrichtung zur herstellung von zerfaserten zelluloseflocken
US4146183A (en) * 1976-09-17 1979-03-27 Westvaco Corporation Pressed pulp bale shredder
US5324389A (en) * 1992-06-19 1994-06-28 The Black Clawson Company Waste paper disintegration, classification and pulping system

Also Published As

Publication number Publication date
SE355613B (de) 1973-04-30
CH547393A (de) 1974-03-29
DE2233340A1 (de) 1973-02-01
JPS5134482B1 (de) 1976-09-27
DE2233340B2 (de) 1978-01-12
GB1385402A (en) 1975-02-26
BE786158A (fr) 1972-11-03
NL150867B (nl) 1976-09-15
NL7209573A (de) 1973-01-16
DE2233340C3 (de) 1978-08-31
IT965102B (it) 1974-01-31
FR2146073A5 (de) 1973-02-23

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AS Assignment

Owner name: FIBRE CONVERTING MACHINERY AB, INGENJORSCENTRUM, S

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:MO OOCH DOMSJO AB;REEL/FRAME:005110/0338

Effective date: 19890519

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Free format text: PATENTED FILE - (OLD CASE ADDED FOR FILE TRACKING PURPOSES)