US3098785A - Method of making lignocellulosic fiberboard - Google Patents

Method of making lignocellulosic fiberboard Download PDF

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Publication number
US3098785A
US3098785A US796920A US79692059A US3098785A US 3098785 A US3098785 A US 3098785A US 796920 A US796920 A US 796920A US 79692059 A US79692059 A US 79692059A US 3098785 A US3098785 A US 3098785A
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Prior art keywords
chips
fibers
fiberboard
pressure
mat
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US796920A
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English (en)
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John G Meiler
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Bowater Board Co
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Bowater Board Co
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Priority to US796920A priority Critical patent/US3098785A/en
Priority to AT156860A priority patent/AT240033B/de
Priority to DEB56868A priority patent/DE1291504B/de
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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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D1/00—Methods of beating or refining; Beaters of the Hollander type
    • D21D1/20—Methods of refining
    • D21D1/30—Disc mills

Definitions

  • a pulp mat is prepared from an aqueous slurry of wood fibers and formed into a thick sheet in a manner somewhat similar to the conventional paper manufacturing process and the mat is pressed into a fiberboard panel.
  • a wet mat is formed in the same general manner as in the wet process; but instead of being pressed while wet, the mat is dried prior to final pressing to produce a product which is initially a low density board such as the common insulation board. This low density board is subsequently subjected while dry to heat and pressure to increase its density and produce a panel or board.
  • the fibers are not dry in the sense of having no moisture content. Indeed, in various prior art processes, the moisture content of fibers is varied from or even below to above 100% based on the dry weight of the fiber.
  • the term dry process or dry formed indicates that the moist fibers are conveyed in a gaseous rather than a liquid vehicle to a felter and formed into a mat which is consolidated while still moist into hardboard by the application of heat and pressure.
  • the wood fibers have commonly been initially produced by subjecting wood chips to an atmosphere of steam under sufficient pressure and for a suificient time to soften the chips to the degree that they may be easily defibered in a refiner.
  • such treatment of wood chips with steam forms water-soluble materials, chiefly polysaccharides.
  • the amount of water solubles which are formed is dependent upon the steaming time and pressure. If such water solubles are allowed to remain in the fibers in appreciable percentages, the finished boards are low in resistance to moisture absorption.
  • the water solubles apparently have somewhat the effect of a wetting agent and thus increase the tendency of the board to absorb moisture.
  • a prirnary object of the invention is to manufacture highquality fiberboard of lignocellulose material by an improved dry process characterized by great efiiciency and high yield.
  • a further object of the invention is to provide a dry process of manufacturing lignocellulose fiber-board which includes the production of high-quality fibers without producing excessive water-soluble materials.
  • Another object of the invention is to provide an improved process for rendering more susceptible to defibration lignooellulose chips which have been steamed to an extent suificient to effect some softening'but insufiicient to produce appreciable quantities of water-soluble materials and insufficient to permit adequate defibration by conventional techniques.
  • a specific object of the invention is to provide an improved dry process of producing hardboard which includes the steps of steaming wood chips to a limited extent to effect some softening while maintaining the formation of water solubles .at a minimum, subjecting the steamed chips to great pressure in a screw press to render the chips more susceptible to defibering and thereafter defibering such chips.
  • the invention embraces a process for producing fibers to be dry formed into a mat and consolidated into fiberboard which comprises exposing chips of lignocellulosic material to an atmosphere of steam at a pressure and for a time sufficient only to soften the chips but insufficient to form appreciable quantities of water solubles from lignocellulose constituents of the chips, subjecting the steamed chips to sufficient high pressure work in a screw press to render the chips more suitable for defibering, and thereafter reducing the chips to fibers.
  • the resulting fibers are then dry formed into a mat which is subjected to consolidating temperature and pressure to produce said fiberboard.
  • lignocellulose material may be used in the process including wood of both coniferous species, such as pine, cedar, hemlock and Douglas fir; and deciduous species, such as hickory, oak, beech, birch and maple.
  • FIGURE 1 is a schematic diagram of the cooking and defibering apparatus
  • FIGURE 2 is a sectional view of one form of screw press
  • FIGURE 3 is a fragmentary sectional view showing the arrangement of barrel bars in the pressing chamber of the screw press of FIGURE 2;
  • FIGURE 4 is a view partially in section of a modified form of screw press
  • FIGURE 5 is a sectional view of the refiner
  • FIGURE 6 is a flow sheet showing a dry process for forming hardboard according to the invention.
  • logs are run through a conventional chipper as is common practice in the paper-making industry.
  • the chips are fed by a conveyor 11 and deposited in chip silos 12 for storage.
  • the term chip as used herein denotes fragments of any shape, however formed.
  • From the silos 12, the chips are conveyed by endless belt conveyor 13 to a lower surge chamber 14 from which they are passed into an elevator 15 and then into an upper surge bin 16.
  • Any suitable conventional cooker such as the Grenco continuous cooker, may be used.
  • the water solubles which are formed by the cooking operation be insufiicient to cause the fiberboard product to exhibit excessive Water absorption or a substantially stained surface or to cause clogging of the pressing equipment during certain hot pressing operations.
  • Excellent quality boards may be produced when the steaming time and pressure is insufficient to produce over about 5% of water solubles by weight of dry fiber.
  • the amount of water solubles produced under any given set of cooking conditions will depend upon the particular wood species cooked. It has been found that, with most species of hardwood, not over about 5% of water solubles are formed when the chips are steamed for a time of from about 1 to about 6 minutes at a pressure of from about 25 to about 50 p.s.i.
  • the relatively lower pressures are employed for the relatively longer times; the pressure which is used being increased progressively as the time is correspondingly decreased.
  • the relatively higher pressures are employed for the relatively shorter times.
  • the steamed chips are discharged from the cooker through a valve '21 and into a conveyor 22. Portions of the chips in the conveyor 22 are discharged into screw conveyors 23 for passage into screw presses 25, and then into the refiners 26. A slight excess of chips is cooked and the excess is returned to the lower surge bin .14.
  • the screw press 25 is the well-known Anderson Expeller which is illustrated and described only in sufficient detail to enable a complete understanding of its use in practicing the process of the invention.
  • the Anderson Expeller embodies a horizontal inlet screw conveyor 30, a vertical pressing section 27, a horizontal pressing section 28, a choke 29, and an outlet 31.
  • the vertical pressing section 27 contains screw 56 which is driven by a suitable electric motor 33.
  • the screw 50 embodies a plurality of short screw flights 29 separated by spaces 40. Breaker bars 32 extend into at least some of the spaces 40 to break up the stock and prevent its rotating with the screw.
  • Another screw 34 is positioned in the horizontal pressing section 28 and is driven by a motor 35.
  • the screw 34 also embodies a plurality of short screw flights 36 separated by spaces 37 into which breaker bars 38 extend to break up the stock and prevent its rotating with the screw.
  • Surrounding the screws 50 and 34 are cylindrical barrels 41 and 42, respectively.
  • the inner walls of one or both of the barrels are defined by the inner faces of a plurality of radial barrel bars 43 as shown in FIGURE 3.
  • each of the barrel bars 43 is inclined at an angle of about 7 degrees to the tangent of the circular barrel at such bar to provide a plurality of ridges around the circumference of the barrel to increase the amount of work to which material passing through the press is subjected.
  • Stock is discharged from the horizontal pressing section 28 through the choke 29 which may be adjusted to vary the amount of pressure to which the stock is subjected.
  • the steamed chips are fed into the conveyor 30' and then successively passed through the vertical pressing section 27 and the horizontal pressing section 28, and discharged through the choke 29.
  • the chips which have been cooked only to a limited extent as described and thus are relatively tough are subjected to an enormous amount of work and pressure in the screw press.
  • One measure of the preferred amount of such work and pressure is obtained from the fact that, in the Anderson Expeller, from about 11 to about 13 h.p./ton/day is expended. In other screw presses, however, the amount of work expended to render the chips susceptible to satisfactory defiberation in the refiner may be more or less than in the Anderson Expeller depending upon the characteristics of the particular machine used.
  • FIGURE 4 Illustrated in FIGURE 4 is an alternative form of screw press which may be used.
  • the screw press shown in FIGURE 4 is the Bauer Pressafiner which, like the Anderson Expeller, is conventional and is shown and described only to the extent necessary for a complete understanding of its use in the practice of the process of the invention.
  • the Pressafiner the chips are introduced into the inlet 60 and moved through the compression chamber 44 by screw 45 which embodies a plurality of spaced screw flights 46.
  • the screw flights 46 are mounted on a shaft 47 which has a plurality of ridges 48 and a progressively increasing diameter toward the discharge end of the compression chamber to subject the stock to increasing work and pressure as it is passed along the chamber.
  • a restricted throat 49 at the discharge end of the screw increases the pressure on the stock.
  • the stock is discharged from the Pressafiner through the outlet 51.
  • the Anderson Expeller the chips are subjected to an enormous amount of pressure in the Pressafiner.
  • the refiner comprises a housing 52 having a chip inlet 53 and a fiber outlet 54.
  • a pair of conventional grinding discs 55 and 56 which are mounted at closely spaced positions and are rotatable about a common axis in opposite directions to grind the stock between the faces of the discs.
  • disc 55 is mounted on shaft 57 which is driven by motor 58
  • disc '56 is mounted on shaft 59 which is rotated by motor 61.
  • the high pressure screw pressing enables the fibers to be reduced in the refiner to very high quality fibers comprising substantially all ultimate fibers :and opened-up aggregates of ultimate :fibers, i.e., loosened collections of a axially through the shaft 59.
  • the resin is supplied through a conduit 63 which is connected to the opening 62 by a rotatable joint 64.
  • a conduit 63 which is connected to the opening 62 by a rotatable joint 64.
  • the resin must be introduced through the chip inlet 53, and it tends to col lect on the surfaces inside the refiner housing. In certain areas within the refiner, the resin collects between moving parts and is heated to the degree that it sets. The hardened resin is frequently ignited by friction caused by its rubbing against metal parts. [introduction through the opening 62. prevents or minimizes such resin collection in the housing.
  • a typical overall process for forming hardboard according to the present invention is schematically illustrated in the flow sheet of FIGURE 6. The portion of the process through the refining step whereby the chips are separated into fibers which has been described in detail hereinbefore is shown in its relation to the remaining steps in the process in the flow sheet.
  • the fibers are felted into a mat, they are subjected to any desired combination of steps of air separation, classification, resin binder mixing, and the like to meet special requirements.
  • the fibers are conveyed to cyclones where a desired amount of air is removed.
  • the semi-dry fibers are transferred to a classifier and separated into fine and coarse components which are deposited in different layers of the mat in the felter.
  • the resin may be added separately to the fine and coarse fibers after classification rather than in the refiners.
  • the resin content of the fibers is in the range of from about 0.5% to about
  • a water repellent such as wax may be added in a ratio of from about 0.5% to about 4%.
  • the wax is All percentages are based on the dry weight of the fibers.
  • the fibers having been dried to the desired moisture content, classified into fine and coarse components and mixed with resin and wax, are air conveyed to a felter.
  • the fibers are blown downwardly onto a moving foraminous belt to form a multiple layer mat with coarse fibers in the middle layers and fine fibers in one or both of the outside layers.
  • a single layer mat may be formed in the felter, in which case no classification of the fibers prior tofelting is necessary.
  • the mat may be pre-compacted to a substantially selfsustaining condition and then placed in a hydraulic press between a pair of smooth heated caul plates for final curing. Sufficient temperature and pressure are applied in the press to set the resin and to consolidate the mat into fiberboard having the desired specific gravity, typically from about 0.8. to about 1.2.
  • the screw press eifects little or no complete separation of the tough chips into fibers.
  • the function of the screw press is to loosen, not defiber, the chips. Defibering is performed in the refiner. It is be lieved that the fibers of chips steamed sufficiently lightly to avoid formation of appreciable quantities of water solubles are so stiff and tenaciously adherent to each other that, in the absence of prior screw pressing, the refiner discs tend (l) to reduce the size of the wood particles without effecting good fiber separation, and (2) to damage the stiff fibers which are separated.
  • the screw press also has the effect of removing some moisture from the chips and thus a portion of whatever small amount of water solubles are produced in the cooking operation is removed with the screw press effiuent. This removal of water solubles increases the strength and water resistance of the final product to a slight degree, but naturally decreases the yield. It has also been found that both the resistance to moisture absorption and the strength of the board may be somewhat increased by adding water to the stock in the cooker, thereby increasing the chip moisture content so that more water and thus more water solubles will be removed in the screw press.
  • the essence of this invention resides in a process wherein limited cooking leaves most of the lignoce'llulosic materials in the chips with very little production of water solubles and therefore little or no need to eliminate water solubles, but leaves the chips relatively tough and tenacious; high pressure screw pressing in any of various forms of screw press loosens the tough chips; and a refining operation produces a high yield of extremely high quality fibers which may be formed into fiberboard which is high in strength, lov. in moisture absorption and relatively stainfree.
  • chips comprising a mixture of 45% oak, 45% hickory, and miscellaneous hardwoods were used.
  • the chips were subjected to an atmosphere of steam for from 46 minutes at 25 p.s.i.
  • the steamed chips were first subjected to high pressures work in an Anderson Expeller with an expenditure of power of from about 11 to about 14 H.P./ton/day.
  • the screw pressed chips were then defibered in a Bauer refiner with an expenditure of power of from about 8 to about 10 H.P./ton/day.
  • the chips were defiberized in the Bauer refiner with an expenditure of power of about 16 to about 18 H.P./ton/day without pre-treatment in a screw press.
  • the thus-formed fibers were mixed with 2.5% resin binder and 2.5% wax and air-laid into a mat which was consolidated at high pressure for two minutes at a temperature of 465 F. to an average thickness of about inch.
  • Each example represents tests of a plurality of boards produced in the same run. Moreover, about eight samples from various positions in each board were tested. Thus, the test data for each example represents the average results of tests of multiple samples from each of several boards produced in the same run.
  • Table I shows that subjection of the chips to high 0 pressure work in a screw press prior to defiberization materially increases both the strength and the resistance to moisture absorption and expansion caused by moisture absorption of the finished boards. It is important to note that, in Examples 6-16, the grinding conditions in the refiner, including disc setting, grinding time, power expenditure, and the like, were such as to achieve optimum or near optimum results. Thus, it is apparent that the improved results which characterize Examples 1-5 are due to the subjection of the chips to high pressure work in the screw press prior to treatment in the refiner.
  • a process for producing consolidated lignocellulosic fiberboard which comprises exposing chips of lignocellulosic material to an atmosphere of steam at a pressure and for a time sufiicient only to soften the chips but insufiicient to form more than about 5% by weight of dry fiber of water solubles from constituents of the chips, subjecting the steamed chips to sufiicient high pressure essentially non-defibering work in a screw press to render 5% the chips more suitable for defibering, and thereafter reducing the chips to fibers in a disc refiner, dry forming the resulting fibers into a mat, and subjecting the mat to consolidating temperature and pressure to produce said fiberboard.
  • a process for producing consolidated Wood fiberboard which comprises exposing wood chips to an atmosphere of steam at a pressure and for a time sufiicient only to soften the chips but insuflicient to form more than about 5% by weight of dry fiber of water solubles from constituents of the wood, subjecting the steamed chips to sufiicient high pressure essentially non-defibering work in a screw press to render the chips more suitable for defibering, thereafter reducing the chips to fibers in a disc refiner, dry forming the resulting fibers into a mat, and subjecting the mat to consolidating temperature and pressure to produce said fiberboard.
  • a process for producing consolidated wood fiberboard which comprises exposing wood chips to an atmosphere of steam at a pressure of from about 25 to about p.s.i. for a time of from about 1 to about 6 minutes, within the specified ranges the relatively lower pressures being employed for the relatively longer times and progressively higher pressures being employed for correspondingly shorter time periods, thus only to soften the chips while minimizing the formation of water solubles from constituents of the wood, subjecting the steamed chips to sufiicient high pressure essentially non-defibering work in a screw press to render the chips more suitable for defibering, thereafter reducing the chips to fibers in a disc refiner, dry forming the resulting fibers into a mat, and subjecting the mat to consolidating temperature and pressure to produce said fiberboard.
  • a process for producing a consolidated wood fiberboard which comprises exposing wood chips to an atmosphere of steam at a pressure of from about 25 to about 50 p.s.i. for a time of from about 1 to about 6 minutes, within the specified ranges the relatively lower pressures being employed for the relatively longer times and progressively higher pressures being employed for correspondingly shorter time periods, thus only to soften the chips while minimizing the formation of water solubles from constituents of the wood, subjecting the steamed chips to sufiicient high pressure essentially non-defibering work in a screw press to render the chips more suitable for defibering, thereafter reducing the chips to fibers in a disc refiner, dry forming the resulting fibers into a mat, and subjecting the mat to consolidating temperature and pressure to produce said fiberboard.
  • a process for producing consolidated wood fiberboard which comprises exposing Wood chips to an atmosphere of steam at a pressure of from about 25 to about 100 p.s.i. for a time of from about 1 to about 6 minutes, within the specified ranges the relatively lower pressures being employed for the relatively longer times and progressively higher pressures being employed for correspondingly shorter time periods, thus only to soften the chips while minimizing the formation of water solubles from constituents of the wood, subjecting the steamed chips to sufficient high pressure essentially non-defibering work in a screw press to render the chips more suitable for 'defibering, thereafter reducing the chips to fibers between a pair of spaced grinding discs relatively rotating about a common axis, dry forming the resulting fibers into a mat, and subjecting the mat to consolidating temperature and pressure to produce said fiberboard.
  • a process for producing consolidated wood fiberboard which comprises exposing wood chips to an atmosphere of steam at a pressure of from about 25 to about 50 p.s.i. for a time of from about 1 to about 6 minutes, within the specified ranges the relatively lower pressures being employed for the relatively longer times and pro- References Cited in the file of this patent UNITED STATES PATENTS Re. 8,877 Taylor Sept. 2, 1879 10 219,034 Sturdevant Aug. 26, 1879 718,003 Kemp Jan. 6, 1903 2,008,892 Asplund July 23, 1935 2,581,654 Hallonquist Jan.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Paper (AREA)
  • Dry Formation Of Fiberboard And The Like (AREA)
US796920A 1959-03-03 1959-03-03 Method of making lignocellulosic fiberboard Expired - Lifetime US3098785A (en)

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US796920A US3098785A (en) 1959-03-03 1959-03-03 Method of making lignocellulosic fiberboard
AT156860A AT240033B (de) 1959-03-03 1960-02-29 Verfahren zur Herstellung von Fasern für die trockene Formung zu einer Matte und Verfestigung zu einer Faserplatte
DEB56868A DE1291504B (de) 1959-03-03 1960-02-29 Trockenverfahren zur Herstellung von Holzfasern

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367820A (en) * 1963-02-01 1968-02-06 Weyerhaeuser Co Reinforced moldable wood fiber mat and method of making the same
US3533906A (en) * 1967-10-11 1970-10-13 Haigh M Reiniger Permanently reacted lignocellulose products and process for making the same
US3943033A (en) * 1973-04-05 1976-03-09 Lennart Wallen & Co Ab Screw thickener
US4517228A (en) * 1983-12-23 1985-05-14 Reliance Universal, Inc. Pigmented prepress coatings for composition board
US4869783A (en) * 1986-07-09 1989-09-26 The Mead Corporation High-yield chemical pulping
US5616419A (en) * 1995-06-07 1997-04-01 Rohm And Haas Company Method of producing coating on reconstituted wood substrate
WO1999007935A1 (en) * 1997-08-08 1999-02-18 Andritz Inc. Method of pretreating lignocellulose fiber-containing material for the pulp making process
US6368528B1 (en) 1998-10-30 2002-04-09 Masonite Corporation Method of making molded composite articles
US20060006264A1 (en) * 2004-07-08 2006-01-12 Sabourin Marc J Energy efficient TMP refining of destructured chips
US20070164143A1 (en) * 2004-07-08 2007-07-19 Sabourin Marc J Disc refiner with increased gap between fiberizing and fibrillating bands
US20130199743A1 (en) * 2012-02-03 2013-08-08 Christine M. Lee Binderless panel made from wood particles and cellulosic fibers
US20130303751A1 (en) * 2010-09-17 2013-11-14 Titan Wood Limited Treatment of Wood Pieces
US9879361B2 (en) 2012-08-24 2018-01-30 Domtar Paper Company, Llc Surface enhanced pulp fibers, methods of making surface enhanced pulp fibers, products incorporating surface enhanced pulp fibers, and methods of making products incorporating surface enhanced pulp fibers
US9920484B2 (en) 2014-02-21 2018-03-20 Domtar Paper Company, Llc Surface enhanced pulp fibers at a substrate surface
US10710930B2 (en) 2014-02-21 2020-07-14 Domtar Paper Company, Llc Surface enhanced pulp fibers in fiber cement
US11441271B2 (en) 2018-02-05 2022-09-13 Domtar Paper Company Llc Paper products and pulps with surface enhanced pulp fibers and increased absorbency, and methods of making same
US11473245B2 (en) 2016-08-01 2022-10-18 Domtar Paper Company Llc Surface enhanced pulp fibers at a substrate surface
US11499269B2 (en) 2016-10-18 2022-11-15 Domtar Paper Company Llc Method for production of filler loaded surface enhanced pulp fibers
US11608596B2 (en) 2019-03-26 2023-03-21 Domtar Paper Company, Llc Paper products subjected to a surface treatment comprising enzyme-treated surface enhanced pulp fibers and methods of making the same

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US2008892A (en) * 1932-03-29 1935-07-23 Defibrator Ab Method of manufacture of pulp
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US2757150A (en) * 1953-01-30 1956-07-31 Weyerhaeuser Timber Co Preparing hot-moldable thermosetting resin and cellulose fiber mixtures
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US219034A (en) * 1879-08-26 Improvement in machines for manufacturing paper-stock
US718003A (en) * 1902-02-27 1903-01-06 George Millard Kemp Mill.
US2008892A (en) * 1932-03-29 1935-07-23 Defibrator Ab Method of manufacture of pulp
US2581654A (en) * 1949-11-21 1952-01-08 Plywood Res Foundation Dry process for making composite consolidated products with controlled presteaming of the raw materials
US2757150A (en) * 1953-01-30 1956-07-31 Weyerhaeuser Timber Co Preparing hot-moldable thermosetting resin and cellulose fiber mixtures
US2893909A (en) * 1954-06-09 1959-07-07 Bauer Bros Co Combined digestion and refining of paper pulp
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Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3367820A (en) * 1963-02-01 1968-02-06 Weyerhaeuser Co Reinforced moldable wood fiber mat and method of making the same
US3533906A (en) * 1967-10-11 1970-10-13 Haigh M Reiniger Permanently reacted lignocellulose products and process for making the same
US3943033A (en) * 1973-04-05 1976-03-09 Lennart Wallen & Co Ab Screw thickener
US4517228A (en) * 1983-12-23 1985-05-14 Reliance Universal, Inc. Pigmented prepress coatings for composition board
US4869783A (en) * 1986-07-09 1989-09-26 The Mead Corporation High-yield chemical pulping
US5616419A (en) * 1995-06-07 1997-04-01 Rohm And Haas Company Method of producing coating on reconstituted wood substrate
US5635248A (en) * 1995-06-07 1997-06-03 Rohm And Haas Company Method of producing coating on reconstituted wood substrate
US5741823A (en) * 1995-06-07 1998-04-21 Rohm And Haas Company Polymerized latex emulsion suitable for producing coating on reconstituted wood substrate
WO1999007935A1 (en) * 1997-08-08 1999-02-18 Andritz Inc. Method of pretreating lignocellulose fiber-containing material for the pulp making process
US20010050151A1 (en) * 1997-08-08 2001-12-13 Marc J. Sabourin Method of pretreating lignocellulose fiber-containing material for the pulp making process
US6899791B2 (en) 1997-08-08 2005-05-31 Andritz Inc. Method of pretreating lignocellulose fiber-containing material in a pulp refining process
US6368528B1 (en) 1998-10-30 2002-04-09 Masonite Corporation Method of making molded composite articles
US20080078854A1 (en) * 2004-07-08 2008-04-03 Sabourin Marc J Composite refiner plate
US20070164143A1 (en) * 2004-07-08 2007-07-19 Sabourin Marc J Disc refiner with increased gap between fiberizing and fibrillating bands
US7300540B2 (en) * 2004-07-08 2007-11-27 Andritz Inc. Energy efficient TMP refining of destructured chips
US20070272778A1 (en) * 2004-07-08 2007-11-29 Sabourin Marc J TMP Refining of destructured chips
US20060006264A1 (en) * 2004-07-08 2006-01-12 Sabourin Marc J Energy efficient TMP refining of destructured chips
US7713381B2 (en) 2004-07-08 2010-05-11 Andritz Inc. TMP refining of destructured chips
US7758726B2 (en) 2004-07-08 2010-07-20 Andritz Inc. Disc refiner with increased gap between fiberizing and fibrillating bands
US7846294B2 (en) 2004-07-08 2010-12-07 Andritz Inc. Method of refining destructured chips
US20130303751A1 (en) * 2010-09-17 2013-11-14 Titan Wood Limited Treatment of Wood Pieces
US9151000B2 (en) * 2010-09-17 2015-10-06 Titan Wood Limited Treatment of wood pieces
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AT240033B (de) 1965-05-10
DE1291504B (de) 1969-03-27

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