EP0138657A2 - Verfahren zum Verbessern des Oberflächenzustands einer Faserplatte - Google Patents

Verfahren zum Verbessern des Oberflächenzustands einer Faserplatte Download PDF

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Publication number
EP0138657A2
EP0138657A2 EP84401794A EP84401794A EP0138657A2 EP 0138657 A2 EP0138657 A2 EP 0138657A2 EP 84401794 A EP84401794 A EP 84401794A EP 84401794 A EP84401794 A EP 84401794A EP 0138657 A2 EP0138657 A2 EP 0138657A2
Authority
EP
European Patent Office
Prior art keywords
mud
layer
sludge
improving
surface condition
Prior art date
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.)
Withdrawn
Application number
EP84401794A
Other languages
English (en)
French (fr)
Other versions
EP0138657A3 (de
Inventor
François Tharrault
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.)
PAPETERIES SIBILLE STENAY
Original Assignee
PAPETERIES SIBILLE STENAY
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by PAPETERIES SIBILLE STENAY filed Critical PAPETERIES SIBILLE STENAY
Publication of EP0138657A2 publication Critical patent/EP0138657A2/de
Publication of EP0138657A3 publication Critical patent/EP0138657A3/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21J—FIBREBOARD; MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS OR FROM PAPIER-MACHE
    • D21J1/00—Fibreboard
    • D21J1/08—Impregnated or coated fibreboard

Definitions

  • the present invention relates to a method for improving the surface condition of a fiberboard.
  • the fibreboards have a relatively porous surface, sensitive to humidity and of an appearance which is not acceptable for certain applications. Also, generally, a coating is applied to improve the surface condition. For this purpose, paint is generally used at a rate of at least 120 g / m 2 , which significantly increases the cost of the panels.
  • the present invention aims to allow the use, as a coating material improving the surface condition, of residues, that is to say very inexpensive materials.
  • the subject of the present invention is a method of improving the surface of a fiberboard, characterized in that a layer of mud having a similar humidity is deposited on a fiber cake which is still wet and the cycle is continued. usual panel manufacturing.
  • mud essentially denotes a medium comprising water and industrial waste comprising short fibers and / or fine fillers.
  • This waste is in particular that obtained in the paper industry, such as sludge and other residues obtained during the manufacture of paper.
  • This sludge in the dry state contains approximately 50% of very short fibers and 50% of fillers.
  • the short fibers advantageously have a size less than 4 mm and the fine fillers advantageously have a size less than 100 ⁇ .
  • a binder can be added to this waste, such as a phenolic resin dispersed in a liquid medium such as water.
  • the fiber cake is brought, by wringing, to a water content of about 80 to 50% by weight (generally 70% by weight) before applying the sludges having substantially the same water content. We then continue the spin and the following normal operations in the manufacture of fiber panels.
  • the application of the layer of sludge can be carried out continuously by application to the cake of fibers with a spray gun, using rollers or rakes. It can also be carried out by applying to the fiber cake a wet paper or "sludge paper" formed on the machine itself (on a secondary box, a suction box) or formed on another machine and brought by a second canvas.
  • the amount of sludge that is deposited can vary between wide limits.
  • the layer of sludge can represent only 100 g / m 2 (by dry weight). However, it is possible to apply larger quantities of up to 5 kg / m 2 (by dry weight) for example, so as to obtain a substantial coating on the fiberboard.
  • the finish can be improved not only by the polish of the heating plate of the machine for manufacturing the fiber panels, but also by various agents (wax, teflon, ...) or by interposition of a material (film, paper, ...), which then give a superficial quality.
  • a panel is thus obtained directly having a very good surface appearance.
  • the properties of the panels are improved: thus, the panels have greater rigidity, better resistance to humidity and better qualities of thermal and sound insulation.
  • the fiber cake is produced continuously at 30% dryness according to the usual process.
  • Stationery sludge is deposited on the surface (waste at around 30% dryness), at a rate of 300 g / m2.
  • the application is done with four nozzles (like a spraying machine) which cover the width.
  • a system of two blades allows to regulate the deposit (the first with bead, the second without bead).
  • a diluted layer containing 4 to 5% of stationary sludge is then sprayed with a system of conical nozzles.
  • the deposited weight is 40 to 50 g / m 2 of layer.
  • the cake is then cut to give the usual panel of 5 m x 1.7 m.
  • This panel is then pressed and dried for 7 minutes at 200 ° C according to the usual cycle.

Landscapes

  • Dry Formation Of Fiberboard And The Like (AREA)
  • Paper (AREA)
EP84401794A 1983-09-12 1984-09-11 Verfahren zum Verbessern des Oberflächenzustands einer Faserplatte Withdrawn EP0138657A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314491A FR2551779B1 (fr) 1983-09-12 1983-09-12 Procede d'amelioration de l'etat de surface d'un panneau de fibres
FR8314491 1983-09-12

Publications (2)

Publication Number Publication Date
EP0138657A2 true EP0138657A2 (de) 1985-04-24
EP0138657A3 EP0138657A3 (de) 1985-05-22

Family

ID=9292135

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84401794A Withdrawn EP0138657A3 (de) 1983-09-12 1984-09-11 Verfahren zum Verbessern des Oberflächenzustands einer Faserplatte

Country Status (2)

Country Link
EP (1) EP0138657A3 (de)
FR (1) FR2551779B1 (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647129A1 (fr) * 1989-05-22 1990-11-23 Pym 71 Panneau de fibres vegetales et son procede de fabrication
EP1016757A1 (de) * 1998-12-31 2000-07-05 Johns Manville International, Inc. Mehrschichtiger Vliesstoff, daraus hergestelltes Laminat und Verfahren zur Herstellung des Vliesstoffs
WO2008019507A1 (en) * 2006-08-18 2008-02-21 Uniboard Canada, Inc. Fiberboards, uses and methods of preparation thereof
US8187418B2 (en) 2005-07-12 2012-05-29 Johns Manville Method of making multilayer nonwoven fibrous mats

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2757114A (en) * 1954-11-08 1956-07-31 Weyerhaeuser Timber Co Manufacture of glazed hardboard
GB876037A (en) * 1958-09-22 1961-08-30 Abitibi Power & Paper Co Improvement in hardboard having an overlay
US3054717A (en) * 1959-08-19 1962-09-18 Masonite Corp Method of producing lignocellulose hardboard
SE305795B (de) * 1963-05-24 1968-11-04 Mo Och Domsjoe Ab
SE327126B (de) * 1968-07-08 1970-08-10 Perstorp Ab
US3663673A (en) * 1969-10-01 1972-05-16 Exxon Research Engineering Co Process for making a bagasse pith composite structure
US4089740A (en) * 1976-01-30 1978-05-16 Conwed Corporation Apparatus for applying secondary layer on board surface

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647129A1 (fr) * 1989-05-22 1990-11-23 Pym 71 Panneau de fibres vegetales et son procede de fabrication
EP1016757A1 (de) * 1998-12-31 2000-07-05 Johns Manville International, Inc. Mehrschichtiger Vliesstoff, daraus hergestelltes Laminat und Verfahren zur Herstellung des Vliesstoffs
US8187418B2 (en) 2005-07-12 2012-05-29 Johns Manville Method of making multilayer nonwoven fibrous mats
WO2008019507A1 (en) * 2006-08-18 2008-02-21 Uniboard Canada, Inc. Fiberboards, uses and methods of preparation thereof

Also Published As

Publication number Publication date
FR2551779A1 (fr) 1985-03-15
FR2551779B1 (fr) 1985-11-22
EP0138657A3 (de) 1985-05-22

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Inventor name: THARRAULT, FRANCOIS