EP0138657A2 - Process for improving the surface condition of a fibre board - Google Patents

Process for improving the surface condition of a fibre board 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Withdrawn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
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German (de)
French (fr)
Other versions
EP0138657A3 (en
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/en
Publication of EP0138657A3 publication Critical patent/EP0138657A3/en
Withdrawn legal-status Critical Current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.

Abstract

The process is characterised in that a layer of sludge of similar moisture content is deposited onto a still moist fibre cake and the usual cycle of manufacture of the panel is continued.

Description

La présente invention concerne un procédé d'amélioration de l'état de surface d'un panneau de fibres.The present invention relates to a method for improving the surface condition of a fiberboard.

Les panneaux de fibres ont une surface relativement poreuse, sensible à l'humidité et d'un aspect peu acceptable pour certaines applications. Aussi, généralement, on applique un revêtement pour améliorer l'état de surface. A cet effet, on utilise généralement une peinture à raison d'au moins 120 g/m2, ce qui augmente de façon importante le coût des panneaux.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.

La présente invention vise à permettre l'utilisation, comme matériau de revêtement améliorant l'état de surface, de résidus, c'est-à-dire de matériaux très peu coûteux.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.

La présente invention a pour objet un procédé d'amélioration de surface d'un panneau de fibres, caractérisé en ce que l'on dépose sur un gâteau de fibres encore humide une couche de boue ayant une humidité voisine et l'on poursuit le cycle habituel de fabrication du panneau.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.

Dans la présente invention, on désigne essentiellement par boue un milieu comprenant de l'eau et des déchets industriels comprenant des fibres courtes et/ou des charges fines. Ces déchets sont notamment ceux obtenus dans l'industrie papetière, tels que les boues et autres résidus obtenus lors de la fabrication du papier. Ces boues à l'état sec contiennent environ 50 % de fibres très courtes et 50 % de charges.In the present invention, the term “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.

Mais on peut également utiliser d'autres déchets, tels que de la sciure de bois, des déchets de carton, de la craie, du kaolin, du charbon, du noir de fumée.But you can also use other waste, such as sawdust, cardboard waste, chalk, kaolin, charcoal, black smoke.

Les fibres courtes ont avantageusement une taille inférieure à 4 mm et les charges fines ont avantageusement une taille inférieure à 100µ.The short fibers advantageously have a size less than 4 mm and the fine fillers advantageously have a size less than 100 μ.

Si besoin est, on peut ajouter à ces déchets un liant, tel qu'une résine phénolique en dispersion dans un milieu liquide tel que l'eau.If necessary, a binder can be added to this waste, such as a phenolic resin dispersed in a liquid medium such as water.

En pratique, on amène le gâteau de fibres, par essorage, jusqu'à une teneur en eau d'environ 80 à 50 % en poids (généralement 70 % en poids) avant d'appliquer les boues ayant sensiblement la même teneur en eau. On poursuit alors l'essorage et la suite des opérations habituelles de la fabrication des panneaux de fibres.In practice, 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.

L'application de la couche de boues peut être effectuée en continu par application sur le gâteau de fibres au pistolet, à l'aide de rouleaux ou de râcles. Elle peut être effectuée également par application sur le gâteau de fibres d'un papier humide ou "papier de boues" formé sur la machine elle-même (sur une caisse secondaire, une caisse aspirante) ou formé sur une autre machine et amené par une deuxième toile.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.

La quantité de boues qui est déposée peut varier entre de larges limites.The amount of sludge that is deposited can vary between wide limits.

Pour obtenir un effet de bouche-pore la couche de boues peut représenter seulement 100 g/m2 (en poids à sec). Mais, on peut appliquer des quantités plus importantes allant jusqu'à 5 kg/m2 (en poids à sec) par exemple, de façon à obtenir un enduit important sur le panneau de fibres.To obtain a sealant effect, 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.

La finition peut être améliorée non seulement par le poli de la plaque chauffante de la machine de fabrication des panneaux de fibres, mais aussi par divers agents (cire, téflon, ...) ou par interposition d'un matériau (film, papier, ...), qui donnent alors une qualité superficielle.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.

Toutefois, le procédé le plus économique consiste à déposer à la surface des boues après essorage et pressage et juste avant le chauffage, une couche très diluée de boues. Cette méthode empêche le collage sur la plaque de chauffage et donne une bonne finition. A cet effet, on peut

  • - soit déposer une couche très diluée (avec ou sans résines) par les moyens habituels (pulvérisation),
  • - soit diluer la boue en surface par un procédé quelconque (à l'aide d'un rouleau de mousse par exemple) en utilisant de l'eau normale ou même de l'eau industrielle.
However, the most economical method consists in depositing on the surface of the sludge after spinning and pressing and just before heating, a very dilute layer of sludge. This method prevents sticking to the heating plate and gives a good finish. To this end, we can
  • - either deposit a very diluted layer (with or without resins) by the usual means (spraying),
  • - or dilute the mud on the surface by any process (using a foam roller for example) using normal water or even industrial water.

On obtient ainsi directement un panneau ayant un très bon aspect de surface.A panel is thus obtained directly having a very good surface appearance.

Il convient de souligner en outre que les propriétés des panneaux sont améliorées : ainsi, les panneaux ont une plus grande rigidité, une meilleure résistance à l'humidité et de meilleures qualités d'isolation thermique et phonique.It should also be emphasized that 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.

L'exemple suivant illustre la présente invention.The following example illustrates the present invention.

EXEMPLEEXAMPLE

Le gâteau de fibres est fabriqué en continu à 30 % de siccité suivant le procédé habituel.The fiber cake is produced continuously at 30% dryness according to the usual process.

Des boues de papeterie sont déposées sur la surface (déchets à 30 % de siccité environ), à raison de 300 g/m2. Stationery sludge is deposited on the surface (waste at around 30% dryness), at a rate of 300 g / m2.

L'application se fait avec quatre buses (genre machine à projeter) qui couvrent la largeur.The application is done with four nozzles (like a spraying machine) which cover the width.

Un système de deux râcles permet de régulariser le dépôt (la première avec bourrelet, la deuxième sans bourrelet).A system of two blades allows to regulate the deposit (the first with bead, the second without bead).

Une couche diluée contenant 4 à 5 % de boues de papeterie est ensuite pulvérisée avec un système de buses coniques. Le poids déposé est de 40 à 50 g/m2 de couche.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.

Le gâteau est alors découpé pour donner le panneau habituel de 5 m x 1,7 m.The cake is then cut to give the usual panel of 5 m x 1.7 m.

Ce panneau est ensuite pressé et séché 7 minutes à 200°C suivant le cycle habituel.This panel is then pressed and dried for 7 minutes at 200 ° C according to the usual cycle.

Claims (10)

1. Procédé d'amélioration de l'état de surface d'un panneau de fibres, caractérisé en ce que l'on dépose sur un gâteau de fibres encore humide une couche de boue ayant une humidité voisine et l'on poursuit le cycle habituel de fabrication du panneau.1. Method for improving the surface condition 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 usual cycle is continued panel manufacturing. 2. Procédé selon la revendication 1, caractérisé en ce qu'on essore le gâteau de fibres jusqu'à une teneur en eau d'environ 80 à 50 % en poids avant d'appliquer la boue.2. Method according to claim 1, characterized in that the fiber cake is wrung to a water content of about 80 to 50% by weight before applying the mud. 3. Procédé selon la revendication 2, caractérisé en ce qu'on essore le gâteau de fibres jusqu'à une teneur en eau d'environ 70 % avant d'appliquer la boue.3. Method according to claim 2, characterized in that the fiber cake is wrung to a water content of about 70% before applying the mud. 4. Procédé selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'on applique la boue sous forme d'un papier humide.4. Method according to any one of claims 1 to 3, characterized in that the mud is applied in the form of a wet paper. 5. Procédé selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'on applique la boue à raison de 100 g/m2 à 5 kg/m2, ces poids étant exprimés par rapport à la matière sèche.5. Method according to any one of claims 1 to 4, characterized in that the mud is applied at a rate of 100 g / m 2 to 5 kg / m 2 , these weights being expressed relative to the dry matter. 6. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'on applique sur la couche de boue après essorage et pressage et juste avant le chauffage une couche de boue diluée.6. Method according to any one of claims 1 to 5, characterized in that a layer of diluted mud is applied to the mud layer after wringing and pressing and just before heating. 7. Procédé selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'on dilue la couche de boue en surface par application d'eau, après essorage et pressage et juste avant le chauffage.7. Method according to any one of claims 1 to 5, characterized in that the surface layer of mud is diluted by applying water, after wringing and pressing and just before heating. 8. Procédé selon l'une quelconque des revendications 1 à 7, caractérisé en ce que la boue est formée de déchets de l'industrie papetière.8. Method according to any one of claims 1 to 7, characterized in that the sludge is formed of waste from the paper industry. 9. Procédé selon la revendication 8, caractérisé en ce que la boue est une boue de papeterie.9. Method according to claim 8, characterized in that the mud is a stationery mud. 10. Panneau de fibres ayant un bon aspect de surface obtenu par un procédé selon l'une quelconque des revendications 1 à 9.10. Fiberboard having a good surface appearance obtained by a process according to any one of claims 1 to 9.
EP84401794A 1983-09-12 1984-09-11 Process for improving the surface condition of a fibre board Withdrawn EP0138657A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8314491A FR2551779B1 (en) 1983-09-12 1983-09-12 METHOD FOR IMPROVING THE SURFACE CONDITION OF A FIBER PANEL
FR8314491 1983-09-12

Publications (2)

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EP0138657A2 true EP0138657A2 (en) 1985-04-24
EP0138657A3 EP0138657A3 (en) 1985-05-22

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EP84401794A Withdrawn EP0138657A3 (en) 1983-09-12 1984-09-11 Process for improving the surface condition of a fibre board

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EP (1) EP0138657A3 (en)
FR (1) FR2551779B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647129A1 (en) * 1989-05-22 1990-11-23 Pym 71 Panel of vegetable fibres and its process of manufacture
EP1016757A1 (en) * 1998-12-31 2000-07-05 Johns Manville International, Inc. Multiple layer nonwoven mat, laminate made therefrom and method of making the mat
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

Citations (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
GB1057054A (en) * 1963-05-24 1967-02-01 Mo Och Domsjoe Ab Method of improving the surface of board material and products
DE1934127A1 (en) * 1968-07-08 1970-02-12 Perstorp Aktiebolag Process for the production of hard fiber panels
US3663673A (en) * 1969-10-01 1972-05-16 Exxon Research Engineering Co Process for making a bagasse pith composite structure
DE2657942A1 (en) * 1976-01-30 1977-08-04 Conwed Corp METHOD AND DEVICE FOR APPLYING AN ADDITIONAL LAYER TO A PLATE-SHAPED PRODUCT

Patent Citations (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
GB1057054A (en) * 1963-05-24 1967-02-01 Mo Och Domsjoe Ab Method of improving the surface of board material and products
DE1934127A1 (en) * 1968-07-08 1970-02-12 Perstorp Aktiebolag Process for the production of hard fiber panels
US3663673A (en) * 1969-10-01 1972-05-16 Exxon Research Engineering Co Process for making a bagasse pith composite structure
DE2657942A1 (en) * 1976-01-30 1977-08-04 Conwed Corp METHOD AND DEVICE FOR APPLYING AN ADDITIONAL LAYER TO A PLATE-SHAPED PRODUCT

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2647129A1 (en) * 1989-05-22 1990-11-23 Pym 71 Panel of vegetable fibres and its process of manufacture
EP1016757A1 (en) * 1998-12-31 2000-07-05 Johns Manville International, Inc. Multiple layer nonwoven mat, laminate made therefrom and method of making the mat
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
EP0138657A3 (en) 1985-05-22
FR2551779A1 (en) 1985-03-15
FR2551779B1 (en) 1985-11-22

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