US3916825A - Apparatus for coating fibers with binder to produce fiberboard - Google Patents

Apparatus for coating fibers with binder to produce fiberboard Download PDF

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Publication number
US3916825A
US3916825A US425135A US42513573A US3916825A US 3916825 A US3916825 A US 3916825A US 425135 A US425135 A US 425135A US 42513573 A US42513573 A US 42513573A US 3916825 A US3916825 A US 3916825A
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US
United States
Prior art keywords
drum
baffle
fibers
wall
fleece
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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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US425135A
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English (en)
Inventor
Erwin Schnitzler
Ulrich Schnitzler
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E SCHNITZLER AND CO GmbH Co
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E SCHNITZLER AND CO GmbH Co
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Filing date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27N—MANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N1/00—Pretreatment of moulding material
    • B27N1/02—Mixing the material with binding agent
    • B27N1/0227—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer
    • B27N1/0236—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings
    • B27N1/0245—Mixing the material with binding agent using rotating stirrers, e.g. the agent being fed through the shaft of the stirrer with the stirrers rotating about an horizontal axis, e.g. in consecutive casings with a single stirrer shaft

Definitions

  • An arbor having arms is rotated in a drum such that the ends of the arms sweep the inner wall of the drum and advance a mass of fibers or chips as a flowable fleece along the drum from an inlet to an outlet thereon.
  • the inside wall of the drum is provided with at least one V-shaped baffle extending radially in from this wall and directed in the direction of displacement of the fleece so that it forms a dead-fluid region and a vortex street in the fleece.
  • the binder is injected into the fleece at the dead-fluid region and mixes with the fibers in the vortex street.
  • the baffle has relative to the arbor rotation axis a tangential length and a radial height both many times greater than the average fiber length.
  • Fibers here including chips or other elongated pieces of material used in the production of construction chipboard or fiberboard (pressed board), are usually fed into a horizontal cylindrical drum at one end. This drum is rotated or an axially extending arbor in the center of the drum is rotated so that arms on this shaft displace the fibers axially toward an outlet. Binder in liquid form is injected into the drum usually through nozzles which open either radially or tangentially relative to the inner surface of the drum.
  • the rotationspeed is generally maintained high enough so that the mass of fibers forms a cylindrically hollow body or fleece lying against the inside of the drum, with the ends of the advancing or mixing arms serving to mix the binder with the fibers. Too slow a rotation speed causes the fibers to tumble and break.
  • the so coated fibers are then formed into mats as discussed in the commonly assigned U.S. Pat. No. 3,655,098 of Ulrich Schnitzler. The mats are then pressed into rigid boards.
  • Another object is the provision of an improved system which uniformly coats fibers for the production of fiberboard.
  • a further object is to provide a coating system which overcomes the above-given disadvantages.
  • the binder is injected at a rate (volume/unit time) which is between 45 and 55 percent the rate necessary to eliminate separation in back of the baffle.
  • a rate volume/unit time which is between 45 and 55 percent the rate necessary to eliminate separation in back of the baffle.
  • FIG. 1 is a longitudinal section partially in diagrammatic form through the apparatus according to this invention.
  • FIG. 2' is a cross section taken along line IlII of FIG. 1;
  • FIG. 3 is a view of the detail indicated by arrow III of FIG. 2;
  • FIG. 4 is a view in the direction of arrow IV of FIG.
  • FIG. 5 is a sectional view similar to FIG. 4 another form of this invention.
  • FIG. 6 is a perspective view illustrating the function ing of the present invention. r
  • the apparatus comprises basically a cylindrical treatment drum'l formed with an inlet 2 in which fiber from a hopper 21' is fed and formed with an outlet 3 whence the coated fiber leaves.
  • An arbor 4 extending along the axis A of the drum 1 has a plurality of axially staggered and diametrically opposed arms 5 whose ends sweep the interior of the drum as the arbor 4 is rotated about the axis A by a drive 6.
  • This relative rotation which could also be effected by rotating the drum concurrently with or instead of the arbor 4, forms all of the individual fibers F (FIG. 3) into a flowable fleece 9 lining the inside of the drum 1.
  • Two injectors 7 axially between the arms 5 at the upstream end of the drum 1 are connected through a pipe 18 and a pump 19 to a source 20 of fluid binder.
  • FIGS. 3 and 4 show how each injector 7 is formed of a generally V-shaped baffle 10 having an apex directed indicating against the direction D of displacement of the arms t and of the fleece 9 and having front surfaces 10a extending radially to the axis A. Located between the flanks of this baffle 10 is a pair of nozzles 8 directed back in the direction D.
  • the baffle has a length T measured tangentially to the drum 1 and a height R measured radially which are both multiples of the average length L of the fibers F. The relationship is maintained.
  • R 6L, and T z 5L are both multiples of the average length L of the fibers F.
  • FIG. 6 shows the fleece 9 as if it were planar.
  • a dead-fluid region 11 is formed in back of the baffle 10.
  • a pair of vortices 16 are formed from the normally laminar flow 15 and are shed periodically to form a Karman vortex street 17 as discussed on page 9-6 of the above-cited Handbook of Fluid Dynam-
  • An injector 13 as shown in FIG. 5 can be used in place of the injector 7 of FIG. 4.
  • This arrangement is a single piece of metal of triangular section having a pair of sides 10' constituting the baffle and a bore l2terminating in a pair of nozzle orifices 8' opening in a back face 14 of the injector 13 in flow direction D.
  • the sides have like but opposite inclinations, here 25, to the direction D.
  • EXAMPLE Fibers having a length between 1 mm and 5 mm, a width between 0.5 mm and 2 mm, and a thickness between 0.1 mm and 0.3 mm are used in fine fiberboard, the average length (L) being 3 mm.
  • the chips In coarser fiberboard the chips have a length between 3 mm and mm, a width between 2 mm and 8 mm, and a thickness between 0.4 mm and 0.5 mm, the average length being 10 mm.
  • T and R of the baffle 10 and 13 lie between 30 mm and 35 mm.
  • the flow speed in direction D is between m/sec and 35 m/sec.
  • An apparatus for coating fibers with a binder comprising:
  • a drum having an axis and an axially spaced inlet and outlet;
  • an arbor extending axially in said drum and having axially spaced radially extending arms with ends adjacent the inner wall of said drum;
  • baffle on said inner wall between axially spaced arms having a height in a radial direction and a length in a tangential direction, each many times greater than the average length of said fibers, said baffle having a pair of sides inclined to the direction of displacement of said fleece thereby and 4 terminating in a common apex pointing opposite this displacement direction;

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Accessories For Mixers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US425135A 1972-12-15 1973-12-17 Apparatus for coating fibers with binder to produce fiberboard Expired - Lifetime US3916825A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722261598 DE2261598A1 (de) 1972-12-15 1972-12-15 Beleimmaschine

Publications (1)

Publication Number Publication Date
US3916825A true US3916825A (en) 1975-11-04

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Family Applications (1)

Application Number Title Priority Date Filing Date
US425135A Expired - Lifetime US3916825A (en) 1972-12-15 1973-12-17 Apparatus for coating fibers with binder to produce fiberboard

Country Status (6)

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US (1) US3916825A (es)
JP (1) JPS4989247A (es)
BE (1) BE807576A (es)
DE (1) DE2261598A1 (es)
IT (1) IT1000251B (es)
SE (1) SE397799B (es)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3974307A (en) * 1975-02-05 1976-08-10 Bowen Michael E Method for coating wood chips with resinous liquid
US4183676A (en) * 1976-12-03 1980-01-15 Draiswerke Gmbh Method of and apparatus for gluing wood chips
US4237814A (en) * 1972-12-13 1980-12-09 Laszlo Balla Apparatus for the continuous production and coating of granulates in fluidized layer
US4402896A (en) * 1982-04-26 1983-09-06 The Celotex Corporation Blow line addition of thermosettable binder in fiberboard manufacture utilizing cooled nozzle
US4478896A (en) * 1982-11-15 1984-10-23 Macmillan, Bloedel Limited Apparatus for blending wood strands with a liquid resin
US4533436A (en) * 1982-04-26 1985-08-06 The Celotex Corporation Apparatus for blow line addition of thermosettable binder in fiberboard manufacture including a cooling nozzle
US5057166A (en) * 1989-03-20 1991-10-15 Weyerhaeuser Corporation Method of treating discontinuous fibers
US5064689A (en) * 1989-03-20 1991-11-12 Weyerhaeuser Company Method of treating discontinuous fibers
US5071675A (en) * 1989-03-20 1991-12-10 Weyerhaeuser Company Method of applying liquid sizing of alkyl ketene dimer in ethanol to cellulose fibers entrained in a gas stream
US5093058A (en) * 1989-03-20 1992-03-03 Medite Corporation Apparatus and method of manufacturing synthetic boards
US5188785A (en) * 1989-03-20 1993-02-23 Medite Corporation Apparatus and method of manufacturing synthetic boards including fire-retardant boards
US5200267A (en) * 1989-03-20 1993-04-06 Medite Corporation Fire-retardant synthretic board product
US5432000A (en) * 1989-03-20 1995-07-11 Weyerhaeuser Company Binder coated discontinuous fibers with adhered particulate materials
US5498478A (en) * 1989-03-20 1996-03-12 Weyerhaeuser Company Polyethylene glycol as a binder material for fibers
US5516585A (en) * 1989-03-20 1996-05-14 Weyerhaeuser Company Coated fiber product with adhered super absorbent particles
US5582644A (en) * 1991-12-17 1996-12-10 Weyerhaeuser Company Hopper blender system and method for coating fibers
US6551401B1 (en) 2000-10-19 2003-04-22 Becker-Underwood, Inc. Machine for coloring landscaping material
US20100104761A1 (en) * 2007-03-19 2010-04-29 Basf Se Method for Coating Water-Absorbing Polymer Particles
US20100186470A1 (en) * 2004-11-30 2010-07-29 Agrium, Inc. Process and apparatus for coating a controlled release product in a rotating drum
US20120058267A1 (en) * 2009-05-18 2012-03-08 Basf Se Coating Process for Water-Absorbing Polymer Particles
US20150016211A1 (en) * 2013-07-09 2015-01-15 Wenger Manufacturing, Inc. Steam/water static mixer injector for extrusion equipment
US11731310B2 (en) * 2017-08-09 2023-08-22 Sika Technology Ag Device including an agitator shaft and a conveyor for applying a building material

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3913384A1 (de) * 1989-04-24 1990-10-25 Henkel Kgaa Mischer, verwendung dieses mischers und verfahren zum herstellen von pulvermischprodukten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US149820A (en) * 1874-04-14 wilkie
US254371A (en) * 1882-02-28 puffer
US3130070A (en) * 1960-08-10 1964-04-21 Potters Robert Coating method and apparatus
US3346240A (en) * 1965-01-15 1967-10-10 Ready T Pour Inc Mixing apparatus
US3841262A (en) * 1970-06-18 1974-10-15 Boehringer Mannheim Gmbh Apparatus for coating tablets

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US149820A (en) * 1874-04-14 wilkie
US254371A (en) * 1882-02-28 puffer
US3130070A (en) * 1960-08-10 1964-04-21 Potters Robert Coating method and apparatus
US3346240A (en) * 1965-01-15 1967-10-10 Ready T Pour Inc Mixing apparatus
US3841262A (en) * 1970-06-18 1974-10-15 Boehringer Mannheim Gmbh Apparatus for coating tablets

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4237814A (en) * 1972-12-13 1980-12-09 Laszlo Balla Apparatus for the continuous production and coating of granulates in fluidized layer
US3974307A (en) * 1975-02-05 1976-08-10 Bowen Michael E Method for coating wood chips with resinous liquid
US4183676A (en) * 1976-12-03 1980-01-15 Draiswerke Gmbh Method of and apparatus for gluing wood chips
US4402896A (en) * 1982-04-26 1983-09-06 The Celotex Corporation Blow line addition of thermosettable binder in fiberboard manufacture utilizing cooled nozzle
US4533436A (en) * 1982-04-26 1985-08-06 The Celotex Corporation Apparatus for blow line addition of thermosettable binder in fiberboard manufacture including a cooling nozzle
US4478896A (en) * 1982-11-15 1984-10-23 Macmillan, Bloedel Limited Apparatus for blending wood strands with a liquid resin
US6270893B1 (en) 1989-03-20 2001-08-07 Weyerhaeuser Company Coated fiber product with adhered super absorbent particles
US5064689A (en) * 1989-03-20 1991-11-12 Weyerhaeuser Company Method of treating discontinuous fibers
US5071675A (en) * 1989-03-20 1991-12-10 Weyerhaeuser Company Method of applying liquid sizing of alkyl ketene dimer in ethanol to cellulose fibers entrained in a gas stream
US5093058A (en) * 1989-03-20 1992-03-03 Medite Corporation Apparatus and method of manufacturing synthetic boards
US5188785A (en) * 1989-03-20 1993-02-23 Medite Corporation Apparatus and method of manufacturing synthetic boards including fire-retardant boards
US5200267A (en) * 1989-03-20 1993-04-06 Medite Corporation Fire-retardant synthretic board product
US5432000A (en) * 1989-03-20 1995-07-11 Weyerhaeuser Company Binder coated discontinuous fibers with adhered particulate materials
US5498478A (en) * 1989-03-20 1996-03-12 Weyerhaeuser Company Polyethylene glycol as a binder material for fibers
US5516585A (en) * 1989-03-20 1996-05-14 Weyerhaeuser Company Coated fiber product with adhered super absorbent particles
US5057166A (en) * 1989-03-20 1991-10-15 Weyerhaeuser Corporation Method of treating discontinuous fibers
US5582644A (en) * 1991-12-17 1996-12-10 Weyerhaeuser Company Hopper blender system and method for coating fibers
US6551401B1 (en) 2000-10-19 2003-04-22 Becker-Underwood, Inc. Machine for coloring landscaping material
US20100186470A1 (en) * 2004-11-30 2010-07-29 Agrium, Inc. Process and apparatus for coating a controlled release product in a rotating drum
US9878959B2 (en) * 2004-11-30 2018-01-30 Agrium Inc. Process and apparatus for coating a controlled release product in a rotating drum
US20150376078A1 (en) * 2004-11-30 2015-12-31 Agrium Inc. Process and apparatus for coating a controlled release product in a rotating drum
US8663734B2 (en) * 2007-03-19 2014-03-04 Basf Se Method for coating water-absorbing polymer particles
US20100104761A1 (en) * 2007-03-19 2010-04-29 Basf Se Method for Coating Water-Absorbing Polymer Particles
US20120058267A1 (en) * 2009-05-18 2012-03-08 Basf Se Coating Process for Water-Absorbing Polymer Particles
US20150016211A1 (en) * 2013-07-09 2015-01-15 Wenger Manufacturing, Inc. Steam/water static mixer injector for extrusion equipment
US9776355B1 (en) * 2013-07-09 2017-10-03 Wenger Manufacturing, Inc. Extruder with static mixer injector
US9776356B1 (en) * 2013-07-09 2017-10-03 Wenger Manufacturing, Inc. Method of extruder operation using static mixer injector
US20170297249A1 (en) * 2013-07-09 2017-10-19 Wenger Manufacturing, Inc. Method of extruder operation using static mixer injector
US9713893B2 (en) * 2013-07-09 2017-07-25 Wenger Manufacturing, Inc. Method of preconditioning comestible materials using steam/water static mixer
US9908090B2 (en) * 2013-07-09 2018-03-06 Wenger Manufacturing, Inc. Steam/water static mixer injector for preconditioners
US9981416B1 (en) * 2013-07-09 2018-05-29 Wenger Manufacturing, Inc. Extruder with static mixer injector
US11731310B2 (en) * 2017-08-09 2023-08-22 Sika Technology Ag Device including an agitator shaft and a conveyor for applying a building material

Also Published As

Publication number Publication date
IT1000251B (it) 1976-03-30
BE807576A (fr) 1974-03-15
JPS4989247A (es) 1974-08-26
DE2261598A1 (de) 1974-06-20
SE397799B (sv) 1977-11-21

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