WO2022269205A1 - Panels based on sunflower pith - Google Patents

Panels based on sunflower pith Download PDF

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Publication number
WO2022269205A1
WO2022269205A1 PCT/FR2022/051244 FR2022051244W WO2022269205A1 WO 2022269205 A1 WO2022269205 A1 WO 2022269205A1 FR 2022051244 W FR2022051244 W FR 2022051244W WO 2022269205 A1 WO2022269205 A1 WO 2022269205A1
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WO
WIPO (PCT)
Prior art keywords
sunflower
panel
panel according
pith
pigment
Prior art date
Application number
PCT/FR2022/051244
Other languages
French (fr)
Inventor
Henna BURNEY
Original Assignee
Luma/Arles
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 Luma/Arles filed Critical Luma/Arles
Publication of WO2022269205A1 publication Critical patent/WO2022269205A1/en

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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
    • D21J3/00—Manufacture of articles by pressing wet fibre pulp, or papier-mâché, between moulds
    • 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
    • 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
    • D21J1/16—Special fibreboard
    • D21J1/20—Insulating board

Definitions

  • the invention relates to panels based on sunflower pith, usable in the field of construction, and having advantageous properties in terms of thermal and sound insulation as well as against fire.
  • the invention also relates to their method of manufacture.
  • Bio-based material means a material derived from biomass of animal or plant origin.
  • the panels based on sunflower pith according to the invention make it possible to manufacture wall covering panels allowing their application on curved surfaces, in particular curved surfaces in 3 axes.
  • the panels based on sunflower pith according to the invention made it possible to manufacture wall covering panels with “non-standard” dimensions (dimensions which exceed the standard dimensions of wallpaper) and easy to install on a surface.
  • panel based on sunflower pith is meant a panel whose composition comprises sunflower pith, preferably in ground form.
  • a panel designates here an element of any type of outline and/or of any three-dimensional geometric shape. It can be for example a flat panel, as well as a curved panel, or comprising at least two faces inclined with respect to each other. Such a panel is for example configured to be used as a facing for a building wall, whatever the shape of the wall to be coated.
  • Sunflower pith is the inner part of the sunflower stem.
  • the preparation of the raw material involves separating the stem pith from the stems harvested from the fields after harvesting the sunflower flowers.
  • a sunflower mash comprising the marrow and the stem of the sunflower.
  • the invention therefore relates, according to a first aspect, to a panel based on sunflower pith, comprising, in percentage by weight:
  • said panel based on sunflower pith consists of, in weight percentage:
  • binder In the present description, the quantity of binder is expressed in dry form (powder).
  • said panel based on sunflower pith comprises, in percentage by weight:
  • said panel based on sunflower pith consists of, in weight percentage:
  • said panel based on sunflower pith comprises, in weight percentage:
  • said panel based on sunflower pith consists of, in weight percentage:
  • the stems are crushed and sieved to separate the pith from the sunflower.
  • Sunflower pith can, for example; be separated from the stalks by suction through a sieve.
  • the sunflower pith is also then ground and sieved, in order to obtain, preferably, a particle size of between 3 and 15 mm, in particular between 5 and 12 mm.
  • the ground sunflower seed After grinding and sieving, the ground sunflower seed preferably has a particle size of between 3 and 50 mm, in particular between 5 and 20 mm.
  • the sunflower marrow is used at the rate of a density of 50 kg/m 3 to 200 kg/m 3 .
  • the panels based on sunflower pith according to the invention can be manufactured by a process comprising the following steps:
  • drying at a temperature between 30 and 100° C., for example in an oven can be carried out to facilitate handling.
  • the mixture of the sunflower pith or the ground sunflower seed, the binder and, where appropriate, the powdered pigment can be carried out by usual means, for example in a cement mixer.
  • the mixing is carried out for the time necessary to obtain a homogeneous mixture, for example at least 30 minutes.
  • the pigment can, for example, be chosen from inorganic or organic pigments (for example, algae, microalgae or bacteria, higher plants, etc.).
  • the binder is an adhesive which may be chosen, for example, from adhesives of natural origin such as starch adhesive, cellulose-based adhesives such as methylcellulose, adhesives animal protein (from chitin, for example) or vegetable protein (from sunflower, for example), or wallpaper glues of the “Quelyd® M2” type (Bostik).
  • adhesives of natural origin such as starch adhesive, cellulose-based adhesives such as methylcellulose, adhesives animal protein (from chitin, for example) or vegetable protein (from sunflower, for example), or wallpaper glues of the “Quelyd® M2” type (Bostik).
  • binder for example, a mixture comprising an adhesive, a mineral binder (for example plaster, cement, lime) and at least one additional filler such as sand, marble powder to provide more rigidity to the panels.
  • a mineral binder for example plaster, cement, lime
  • additional filler such as sand, marble powder
  • At least one additive for example a preservative, such as an anti-mold agent.
  • an essential oil or a mixture of essential oils will be used, such as, for example, the essential oils of lavender and lemongrass.
  • the mixture can then be placed in the mold in order to be pressed at high temperature, for example between 80° C. and 100° C. under pressure, for example a pressure of the order of 50 bar.
  • the mold is left under pressure for a period of at least 1 hour.
  • the pressing can be carried out at ambient temperature (for example, between 15°C and 30°C).
  • the thickness of the panel according to the invention is between 1 and 100 mm, preferably 2 to 50 mm.
  • the panels based on sunflower pith according to the invention have interesting properties in terms of thermal regulation, sound absorption and fire resistance.
  • the panels based on sunflower pith according to the invention have particularly advantageous sound absorption properties at low frequencies (between 0 and 1000 Hz), with an absorption coefficient greater than 0.5.
  • the panels according to the invention can be glued using a strong high-performance universal glue.
  • the invention also relates, according to subsequent aspects, to the use of the panels based on sunflower pith for coating a support, in particular for wall cladding and/or as panels for thermal regulation and/or sound insulation.
  • the invention also relates to a process for thermal regulation of a surface, in which a panel based on sunflower pith as described above is applied to said surface.
  • the invention also relates to a method for soundproofing a surface, in which a panel based on sunflower pith as described above is applied to said surface.
  • said surface is a building wall.
  • Figure 1 shows the plane wave sound absorption coefficient on a 50 mm thick sunflower pith panel.
  • FIG. 2 illustrates a panel comprising several sides, in particular here three sides, inclined with respect to each other, for example at right angles.
  • Example 1 preparation of a panel based on sunflower pith
  • the sunflower pith has been separated from the bark. It is sieved manually using a 0.4mm sieve to remove dust residues. 600g of sieved marrow are then placed in a 67L electric concrete mixer. The marrow alone rotates for 2 min in the cement mixer.
  • the mixture is still allowed to turn for 15 minutes in the cement mixer.
  • a bakelite wooden mold was specially made: this mold consists of a rectangular frame divided into two squares of 1.20x1.20m. The bottom and the top of the mold are detached from the frame to facilitate demoulding. The frame is laid out on a work surface, then the bottom plates are laid out in the frame.
  • Sheets of Teflon® previously folded on two sides are placed at the bottom of the mold, to facilitate the release of the panel once pressed.
  • the sunflower pith is poured over the Teflon® sheets, ensuring a uniform layer over the entire surface.
  • a 2cm template is used to control a uniform thickness.
  • a sheet of custom-cut kraft paper is laid over the pith layer in each space of the frame.
  • a thin layer of water is sprayed on the kraft paper (about 100g).
  • the second bakelite wooden panel is placed on the kraft paper sheet.
  • the loaded mold is lifted and placed on the lower platen of a veneer press with two heated platens of 3x1.3m (Ital Press) ensuring a layout in the center of the platen.
  • the press should already be heated to a temperature of 80-90°C.
  • the mold is pressed at 90°C and 50bar until the upper plate touches the edge of the mould. The mold is then left under pressure for 1 hour.
  • the press is opened to release the pressure, then the entire mold is taken out of the press and the top panel of bakelite wood is removed.
  • the sheet of kraft paper is kept to ensure a good hold of the material, and it can also be used for gluing on the walls.
  • the panels 120cm ⁇ 120cm ⁇ 0.3 cm) are then removed using the folds of the Teflon® sheets, then the Teflon® sheets are removed.
  • Example 2 acoustic behavior The plane wave absorption coefficient of samples of 15cmx15cm panels with a thickness of 50 mm was measured. For each sample, a cylindrical specimen with a diameter of 45 mm was taken.
  • the absorption measurement of the material is carried out under plane wave conditions in a standing wave tube (Kundt tube) with the classic two-microphone technique.
  • the absorption coefficient a depends on the transfer function H12 measured between the two microphones separated by a distance s and on the wave number k.
  • the samples are cylindrical in shape, prepared to the diameter of the standing wave tube.

Abstract

The invention relates to panels based on sunflower pith, which are able to be used in the building sector, in particular for a wall covering.

Description

Panneaux à base de moelle de tournesol Sunflower Pith Panels
L’invention concerne des panneaux à base de moelle de tournesol, utilisables dans le domaine du bâtiment, et présentant des propriétés avantageuses sur le plan de l’isolation thermique, phonique ainsi que contre le feu. The invention relates to panels based on sunflower pith, usable in the field of construction, and having advantageous properties in terms of thermal and sound insulation as well as against fire.
L’invention concerne également leur procédé de fabrication. The invention also relates to their method of manufacture.
L’utilisation de matériaux biosourcés concourt significativement au stockage de carbone atmosphérique et à la préservation des ressources naturelles. On entend par « matériau biosourcé » un matériau issu de la biomasse d’origine animale ou végétale. The use of biosourced materials contributes significantly to the storage of atmospheric carbon and the preservation of natural resources. “Bio-based material” means a material derived from biomass of animal or plant origin.
Toutefois, pour être utilisables dans le secteur du bâtiment, ces matériaux doivent non seulement présenter des propriétés respectant les normes de sécurité en vigueur, mais également des propriétés physiques, mécaniques etc. permettant de les mettre en œuvre dans toutes les dispositions souhaitées (comme isolant thermique ou phonique, comme revêtement sur des surfaces planes ou non etc.). On a maintenant trouvé que de panneaux fabriqués à partir de moelle de tournesol et d’un liant permettaient d’obtenir les propriétés recherchées. However, to be usable in the construction sector, these materials must not only have properties that comply with the safety standards in force, but also physical, mechanical properties, etc. allowing them to be implemented in all the desired arrangements (as thermal or sound insulation, as a coating on flat or uneven surfaces, etc.). It has now been found that panels made from sunflower pith and a binder provide the desired properties.
En particulier, on a trouvé que les panneaux à base de moelle de tournesol selon l’invention permettaient de fabriquer des panneaux de revêtement mural permettant leur application sur des surfaces courbes, notamment des surfaces courbes en 3 axes. In particular, it has been found that the panels based on sunflower pith according to the invention make it possible to manufacture wall covering panels allowing their application on curved surfaces, in particular curved surfaces in 3 axes.
On a également trouvé que les panneaux à base de moelle de tournesol selon l’invention permettaient de fabriquer des panneaux de revêtement mural ayant dimension « hors standard » (dimensions qui dépassent les dimensions standard des papier peint) et facile à installer sur une surface. It was also found that the panels based on sunflower pith according to the invention made it possible to manufacture wall covering panels with “non-standard” dimensions (dimensions which exceed the standard dimensions of wallpaper) and easy to install on a surface.
Par « panneau à base de moelle de tournesol », on entend un panneau dont la composition comprend de la moelle de tournesol, de préférence sous forme broyée. By “panel based on sunflower pith”, is meant a panel whose composition comprises sunflower pith, preferably in ground form.
Un panneau désigne ici un élément de tout type de contour et/ou de toute forme géométrique en trois dimensions. Il peut s’agir par exemple d’un panneau plan, aussi bien que d’un panneau courbe, ou comportant au moins deux pans inclinés l’un par rapport à l’autre. Un tel panneau est par exemple configuré pour être utilisé en parement de paroi de bâtiment, quelle que soit une forme de la paroi à revêtir. A panel designates here an element of any type of outline and/or of any three-dimensional geometric shape. It can be for example a flat panel, as well as a curved panel, or comprising at least two faces inclined with respect to each other. Such a panel is for example configured to be used as a facing for a building wall, whatever the shape of the wall to be coated.
La moelle de tournesol est la partie intérieure de la tige de tournesol. Sunflower pith is the inner part of the sunflower stem.
Selon un aspect de l’invention, on utilise uniquement la moelle de tournesol.According to one aspect of the invention, only sunflower pith is used.
La préparation de la matière première consiste à séparer la moelle de la tige à partir des tiges récoltées dans les champs après la récolte des fleurs de tournesol. The preparation of the raw material involves separating the stem pith from the stems harvested from the fields after harvesting the sunflower flowers.
Selon autre aspect de l’invention, on peut utiliser également un broyât de tournesol comprenant la moelle et la tige de tournesol. According to another aspect of the invention, it is also possible to use a sunflower mash comprising the marrow and the stem of the sunflower.
L’invention concerne donc, selon un premier aspect, un panneau à base de moelle de tournesol, comprenant, en pourcentage pondéral : The invention therefore relates, according to a first aspect, to a panel based on sunflower pith, comprising, in percentage by weight:
- 55 à 75%, de préférence de 60 à 75%, de moelle de tournesol ou de broyât de tournesol, - 55 to 75%, preferably 60 to 75%, of sunflower pith or crushed sunflower,
- 10 à 40%, de préférence de 10 à 15%, de liant, - 10 to 40%, preferably 10 to 15%, of binder,
- 0 à 30%, de préférence de 10 à 20%, d’au moins un pigment, - 0 to 30%, preferably 10 to 20%, of at least one pigment,
- 0 à 5%, de préférence de 1 à 3%, d’au moins un additif, en particulier un agent conservateur, - 0 to 5%, preferably 1 to 3%, of at least one additive, in particular a preservative,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
Avantageusement, ledit panneau à base de moelle de tournesol, consiste en, en pourcentage pondéral : Advantageously, said panel based on sunflower pith consists of, in weight percentage:
- 55 à 75%, de préférence de 60 à 75%, de moelle de tournesol ou de broyât de tournesol, - 55 to 75%, preferably 60 to 75%, of sunflower pith or crushed sunflower,
- 10 à 40%, de préférence de 10 à 15%, de liant, - 10 to 40%, preferably 10 to 15%, of binder,
- 0 à 30%, de préférence de 10 à 20%, d’au moins un pigment, - 0 to 30%, preferably 10 to 20%, of at least one pigment,
- 0 à 5%, de préférence de 1 à 3%, d’au moins un additif, en particulier un agent conservateur, - 0 to 5%, preferably 1 to 3%, of at least one additive, in particular a preservative,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
Dans la présente description, la quantité de liant est exprimée sous forme sèche (poudre). In the present description, the quantity of binder is expressed in dry form (powder).
Les pourcentages pondéraux sont exprimés par rapport au poids total des composants du panneau. Selon un aspect préféré, ledit panneau à base de moelle de tournesol, comprend, en pourcentage pondéral : The weight percentages are expressed relative to the total weight of the components of the panel. According to a preferred aspect, said panel based on sunflower pith, comprises, in percentage by weight:
- 60 à 75% de moelle de tournesol ou de broyât de tournesol, - 60 to 75% sunflower marrow or crushed sunflower,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, - 2 to 3% anti-mold agent,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
Avantageusement, ledit panneau à base de moelle de tournesol, consiste en, en pourcentage pondéral : Advantageously, said panel based on sunflower pith consists of, in weight percentage:
- 60 à 75% de moelle de tournesol ou de broyât de tournesol, - 60 to 75% sunflower marrow or crushed sunflower,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, la somme des composants n’excédant pas 100%. - 2 to 3% anti-mold agent, the sum of the components not exceeding 100%.
Selon un autre aspect préféré, ledit panneau à base de moelle de tournesol, comprend, en pourcentage pondéral : According to another preferred aspect, said panel based on sunflower pith, comprises, in weight percentage:
- 60 à 75%, de préférence 70 à 75%, de moelle de tournesol, - 60 to 75%, preferably 70 to 75%, of sunflower marrow,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, - 2 to 3% anti-mold agent,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
Avantageusement, ledit panneau à base de moelle de tournesol, consiste en, en pourcentage pondéral : Advantageously, said panel based on sunflower pith consists of, in weight percentage:
- 60 à 75%, de préférence 70 à 75%, de moelle de tournesol, - 60 to 75%, preferably 70 to 75%, of sunflower marrow,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, - 2 to 3% anti-mold agent,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
Les tiges sont broyées et tamisées pour séparer la moelle de tournesol. La moelle de tournesol peut, par exemple ; être séparée des tiges par aspiration à travers un tamis. La moelle de tournesol est également ensuite broyée et tamisée, afin d’obtenir, de préférence, une granulométrie comprise entre 3 et 15 mm, en particulier entre 5 et 12 mm. The stems are crushed and sieved to separate the pith from the sunflower. Sunflower pith can, for example; be separated from the stalks by suction through a sieve. The sunflower pith is also then ground and sieved, in order to obtain, preferably, a particle size of between 3 and 15 mm, in particular between 5 and 12 mm.
Après broyage et tamisage, le broyât de tournesol a, de préférence, une granulométrie comprise entre 3 et 50 mm, en particulier entre 5 et 20 mm. After grinding and sieving, the ground sunflower seed preferably has a particle size of between 3 and 50 mm, in particular between 5 and 20 mm.
De préférence, la moelle de tournesol est utilisée à raison d’une masse volumique de 50 kg/m3 à 200kg/m3. Preferably, the sunflower marrow is used at the rate of a density of 50 kg/m 3 to 200 kg/m 3 .
Les panneaux à base de moelle de tournesol selon l’invention peuvent être fabriqués par un procédé comprenant les étapes suivantes : The panels based on sunflower pith according to the invention can be manufactured by a process comprising the following steps:
- préparation du mélange comprenant la moelle de tournesol ou le broyât de tournesol, le liant, et de manière optionnelle, au moins un pigment, - preparation of the mixture comprising the sunflower pith or the ground sunflower, the binder, and optionally, at least one pigment,
- pulvérisation d’eau sur le mélange, - spraying water on the mixture,
- pressage à chaud du mélange dans un moule, et - hot pressing of the mixture in a mould, and
- démoulage du panneau ainsi obtenu. - demoulding of the panel thus obtained.
Le cas échéant, un séchage à une température comprise entre 30 et 100°C, par exemple en étuve, peut être effectué pour faciliter la manipulation. If necessary, drying at a temperature between 30 and 100° C., for example in an oven, can be carried out to facilitate handling.
Le mélange de la moelle de tournesol ou du broyât de tournesol, du liant et, le cas échéant, du pigment en poudre peut être réalisée par des moyens usuels, par exemple dans une bétonnière. Le mélange est effectué pendant la durée nécessaire à l’obtention d’un mélange homogène, par exemple au moins 30 minutes. The mixture of the sunflower pith or the ground sunflower seed, the binder and, where appropriate, the powdered pigment can be carried out by usual means, for example in a cement mixer. The mixing is carried out for the time necessary to obtain a homogeneous mixture, for example at least 30 minutes.
Le pigment peut, par exemple, être choisi parmi les pigments minéraux ou organiques (par exemple, algues, microalgues ou bactéries, végétaux supérieurs etc.). The pigment can, for example, be chosen from inorganic or organic pigments (for example, algae, microalgae or bacteria, higher plants, etc.).
Selon un aspect de l’invention, le liant est une colle qui peut-être choisie, par exemple, parmi des colles d’origine naturelle telles que la colle d’amidon, les colles à base de cellulose telles que la méthylcellulose, les colles de protéine animale (de chitine, par exemple) ou végétale (de tournesol, par exemple), ou encore les colles à papier peint de type « Quelyd® M2 » (Bostik). According to one aspect of the invention, the binder is an adhesive which may be chosen, for example, from adhesives of natural origin such as starch adhesive, cellulose-based adhesives such as methylcellulose, adhesives animal protein (from chitin, for example) or vegetable protein (from sunflower, for example), or wallpaper glues of the “Quelyd® M2” type (Bostik).
On peut également utiliser comme liant, par exemple, un mélange comprenant une colle, un liant minéral (par exemple du plâtre, ciment, chaux) et au moins une charge supplémentaire de type sable, poudre de marbre pour apporter plus de rigidité aux panneaux. It is also possible to use as binder, for example, a mixture comprising an adhesive, a mineral binder (for example plaster, cement, lime) and at least one additional filler such as sand, marble powder to provide more rigidity to the panels.
Lors de la pulvérisation de l’eau sur le mélange, on peut ajouter à l’eau, de manière optionnelle, au moins un additif, par exemple un agent conservateur, tel qu’un agent anti-moisissures. When spraying water on the mixture, it is possible to add to the water, optionally, at least one additive, for example a preservative, such as an anti-mold agent.
On utilisera, de préférence, une huile essentielle ou un mélange d’huiles essentielles, telles que, par exemple, les huiles essentielles de lavande et de citronnelle. Preferably, an essential oil or a mixture of essential oils will be used, such as, for example, the essential oils of lavender and lemongrass.
Le mélange peut être ensuite placé dans le moule afin d'être pressé à température élevée, par exemple comprise entre 80°C et 100°C sous pression, par exemple une pression de l’ordre de 50 bar. De préférence, le moule est laissé sous pression pendant une durée d’au moins 1 h. The mixture can then be placed in the mold in order to be pressed at high temperature, for example between 80° C. and 100° C. under pressure, for example a pressure of the order of 50 bar. Preferably, the mold is left under pressure for a period of at least 1 hour.
Alternativement, le pressage peut être réalisé à température ambiante (par exemple, entre 15°C et 30°C). Alternatively, the pressing can be carried out at ambient temperature (for example, between 15°C and 30°C).
Avantageusement, l’épaisseur du panneau selon l’invention est comprise entre 1 et 100 mm, de préférence 2 à 50 mm. Advantageously, the thickness of the panel according to the invention is between 1 and 100 mm, preferably 2 to 50 mm.
Les panneaux à base de moelle de tournesol selon l’invention présentent des propriétés intéressantes en termes de régulation thermique, d’absorption acoustique et de résistance au feu. The panels based on sunflower pith according to the invention have interesting properties in terms of thermal regulation, sound absorption and fire resistance.
Les tests au feu effectués avec panneau seul ou collé sur un support plaque de plâtre à faces cartonnées M1 , ou sur des supports en pose libre, avec différentes compositions et épaisseurs, ont été réalisés par un laboratoire agréé, et ont conduit à la certification M1 pour tous les essais. The fire tests carried out with the panel alone or glued to a plasterboard support with M1 cardboard faces, or on freestanding supports, with different compositions and thicknesses, were carried out by an approved laboratory, and led to M1 certification. for all tests.
Les panneaux à base de moelle de tournesol selon l’invention présentent des propriétés d’absorption acoustique particulièrement intéressantes à des fréquences basses (entre 0 à 1000Hz), avec un coefficient d’absorption supérieur à 0,5. The panels based on sunflower pith according to the invention have particularly advantageous sound absorption properties at low frequencies (between 0 and 1000 Hz), with an absorption coefficient greater than 0.5.
Pour une utilisation en revêtement mural, les panneaux selon l’invention peuvent être collés à l’aide d’une colle universelle forte à haute performance. For use as a wall covering, the panels according to the invention can be glued using a strong high-performance universal glue.
L’invention concerne également, selon des aspects ultérieurs, l’utilisation des panneaux à base de moelle de tournesol pour revêtir un support, en particulier pour un revêtement mural et/ou en tant que panneaux de régulation thermique et/ou pour isolation phonique. The invention also relates, according to subsequent aspects, to the use of the panels based on sunflower pith for coating a support, in particular for wall cladding and/or as panels for thermal regulation and/or sound insulation.
L’invention concerne également un procédé de régulation thermique d’une surface, dans lequel on applique sur ladite surface un panneau à base de moelle de tournesol tel que décrit plus haut. The invention also relates to a process for thermal regulation of a surface, in which a panel based on sunflower pith as described above is applied to said surface.
L’invention concerne également un procédé d’isolation phonique d’une surface, dans lequel on applique sur ladite surface un panneau à base de moelle de tournesol tel que décrit plus haut. The invention also relates to a method for soundproofing a surface, in which a panel based on sunflower pith as described above is applied to said surface.
Avantageusement, ladite surface est une paroi de bâtiment. Advantageously, said surface is a building wall.
Brève description des dessins Brief description of the drawings
La figure 1 représente le coefficient d’absorption acoustique en onde plane sur un panneau à base de moelle de tournesol de 50 mm d’épaisseur. Figure 1 shows the plane wave sound absorption coefficient on a 50 mm thick sunflower pith panel.
Un panneau désigne ici un élément de tout type de contour et/ou de toute forme géométrique en trois dimensions. Par exemple, la figure 2 illustre un panneau comportant plusieurs pans, en particuliers ici trois pan, inclinés les uns par rapport aux autres, par exemple à angles droits. A panel designates here an element of any type of outline and/or of any three-dimensional geometric shape. For example, FIG. 2 illustrates a panel comprising several sides, in particular here three sides, inclined with respect to each other, for example at right angles.
L’invention est illustrée par les exemples qui suivent. The invention is illustrated by the following examples.
Exemple 1 : préparation d’un panneau à base de moelle de tournesol Example 1: preparation of a panel based on sunflower pith
1) Préparation du mélange 1) Preparation of the mixture
La moelle de tournesol a été séparée de l’écorce. Elle est tamisée manuellement à l’aide d’un tamis de 0,4mm afin d’éliminer les résidus de poussière. 600g de moelle tamisée sont ensuite placés dans une bétonnière électrique de 67L. La moelle seule tourne pendant 2 min dans la bétonnière. The sunflower pith has been separated from the bark. It is sieved manually using a 0.4mm sieve to remove dust residues. 600g of sieved marrow are then placed in a 67L electric concrete mixer. The marrow alone rotates for 2 min in the cement mixer.
Pendant que la bétonnière tourne avec la moelle, 72g de pigment vert Montecarlo (Ocres de France) en poudre est ajouté sur la moelle, en continuant à mélanger pendant 3 min afin de bien distribuer le pigment. While the cement mixer rotates with the marrow, 72g of powdered Montecarlo green pigment (Ocres de France) is added to the marrow, continuing to mix for 3 min in order to distribute the pigment well.
On ajoute au mélange 121 ,7g de méthylcellulose en poudre en continuant sans arrêter la bétonnière pendant 15 min. On pulvérise ensuite, 727,71g d’eau auxquels on additionne quelques ml d’un mélange d’huiles essentielles de lavande et de citronnelle à l’aide d’un pulvérisateur professionnel sur le mélange et sans arrêter la bétonnière. 121.7 g of powdered methylcellulose are added to the mixture, continuing without stopping the mixer for 15 minutes. 727.71 g of water are then sprayed to which a few ml of a mixture of essential oils of lavender and lemongrass are added using a professional sprayer on the mixture and without stopping the mixer.
On laisse encore le mélange tourner pendant 15 min dans la bétonnière. The mixture is still allowed to turn for 15 minutes in the cement mixer.
2/ Disposition dans le moule et pressage 2/ Arrangement in the mold and pressing
Un moule en bois bakélite a été spécialement fabriqué: ce moule est constitué d’un cadre rectangulaire divisé en deux carreaux de 1 ,20x1 ,20m. Le fond et la partie supérieure du moule sont détachés du cadre pour faciliter le démoulage. Le cadre est disposé sur un plan de travail, puis les plaques inférieures sont disposées dans le cadre. A bakelite wooden mold was specially made: this mold consists of a rectangular frame divided into two squares of 1.20x1.20m. The bottom and the top of the mold are detached from the frame to facilitate demoulding. The frame is laid out on a work surface, then the bottom plates are laid out in the frame.
Des feuilles de Téflon® préalablement pliée sur deux côtés sont disposées au fond du moule, pour faciliter le démoulage du panneau une fois pressé. Sheets of Teflon® previously folded on two sides are placed at the bottom of the mold, to facilitate the release of the panel once pressed.
La moelle de tournesol est versée sur les feuilles de Téflon® en assurant une couche uniforme sur la totalité de la surface. Pour ce faire, un gabarit de 2cm sert à contrôler une épaisseur uniforme. The sunflower pith is poured over the Teflon® sheets, ensuring a uniform layer over the entire surface. To do this, a 2cm template is used to control a uniform thickness.
Une feuille de papier kraft coupée sur mesure est disposée sur la couche de moelle dans chaque espace du cadre. Une couche fine d’eau est pulvérisée sur le papier kraft (environ 100g). A sheet of custom-cut kraft paper is laid over the pith layer in each space of the frame. A thin layer of water is sprayed on the kraft paper (about 100g).
Le deuxième panneau en bois bakélite est disposé sur la feuille de papier kraft. Le moule chargé est soulevé est placé sur le plateau inférieur d’une presse de placage à deux plateaux chauffants de 3x1 ,3m (Ital Press) en assurant une disposition au centre du plateau. La presse doit être déjà chauffée à une température de 80-90°C. The second bakelite wooden panel is placed on the kraft paper sheet. The loaded mold is lifted and placed on the lower platen of a veneer press with two heated platens of 3x1.3m (Ital Press) ensuring a layout in the center of the platen. The press should already be heated to a temperature of 80-90°C.
On presse le moule à 90°C et à 50bar jusqu’à que le plateau supérieur touche le bord du moule. On laisse ensuite le moule sous pression pendant 1 h. The mold is pressed at 90°C and 50bar until the upper plate touches the edge of the mould. The mold is then left under pressure for 1 hour.
3/ Démoulage 3/ Demolding
La presse est ouverte pour relâcher la pression, puis on sort le moule entier de la presse et on retire le panneau supérieur de bois bakélite. The press is opened to release the pressure, then the entire mold is taken out of the press and the top panel of bakelite wood is removed.
La feuille de papier kraft est conservée afin d’assurer une bonne tenue du matériau, et elle pourra servir également au collage sur les murs. On retire ensuite les panneaux (120cmx120cm x0,3 cm) à l’aide des plis des feuilles deTéflon®, puis on retire les feuilles de Téflon®. The sheet of kraft paper is kept to ensure a good hold of the material, and it can also be used for gluing on the walls. The panels (120cm×120cm×0.3 cm) are then removed using the folds of the Teflon® sheets, then the Teflon® sheets are removed.
Exemple 2 : comportement acoustique Le coefficient d’absorption en onde plane d’échantillons de panneaux de 15cmx15cm avec une épaisseur de 50 mm a été mesuré. Pour chaque échantillon, on a prélevé une éprouvette cylindrique de diamètre 45mm. Example 2: acoustic behavior The plane wave absorption coefficient of samples of 15cmx15cm panels with a thickness of 50 mm was measured. For each sample, a cylindrical specimen with a diameter of 45 mm was taken.
Les deux faces de chaque éprouvette sont mesurées. Both sides of each specimen are measured.
La mesure d'absorption du matériau est réalisée en conditions d'ondes planes dans un tube à ondes stationnaires (tube de Kundt) avec la technique classique des deux microphones. Le coefficient d'absorption a dépend de la fonction de transfert H12 mesurée entre les deux microphones espacés d'une distance s et du nombre d'onde k.
Figure imgf000010_0001
Les échantillons sont de forme cylindrique, préparés au diamètre du tube à ondes stationnaires. The absorption measurement of the material is carried out under plane wave conditions in a standing wave tube (Kundt tube) with the classic two-microphone technique. The absorption coefficient a depends on the transfer function H12 measured between the two microphones separated by a distance s and on the wave number k.
Figure imgf000010_0001
The samples are cylindrical in shape, prepared to the diameter of the standing wave tube.
La procédure de mesure du coefficient d'absorption en incidence normale (tube de Kundt) s’appuie sur la norme ISO 10534-2. The procedure for measuring the absorption coefficient at normal incidence (Kundt tube) is based on standard ISO 10534-2.
Les résultats sont représentés sur la figure 1 et montrent des propriétés d’absorption acoustique particulièrement intéressantes à des fréquences basses (entre 0 et 1000Hz), avec un coefficient d’absorption supérieur à 0,5. The results are shown in Figure 1 and show particularly interesting sound absorption properties at low frequencies (between 0 and 1000Hz), with an absorption coefficient greater than 0.5.

Claims

REVENDICATIONS
1. Panneau à base de moelle de tournesol, comprenant, en pourcentage pondéral : 1. Panel based on sunflower pith, comprising, in percentage by weight:
- 55 à 75%, de préférence de 60 à 75%, de moelle de tournesol ou de broyât de tournesol, - 55 to 75%, preferably 60 to 75%, of sunflower pith or crushed sunflower,
- 10 à 40%, de préférence de 10 à 15%, de liant, - 10 to 40%, preferably 10 to 15%, of binder,
- 0 à 30%, de préférence de 10 à 20%, d’au moins un pigment, - 0 to 30%, preferably 10 to 20%, of at least one pigment,
- 0 à 5%, de préférence de 1 à 3%, d’au moins un additif, en particulier un agent conservateur, - 0 to 5%, preferably 1 to 3%, of at least one additive, in particular a preservative,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
2. Panneau selon la revendication 1 , comprenant, en pourcentage pondéral :2. Panel according to claim 1, comprising, in weight percentage:
- 60 à 75% de moelle de tournesol ou de broyât de tournesol, - 60 to 75% sunflower marrow or crushed sunflower,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, - 2 to 3% anti-mold agent,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
3. Panneau selon les revendications 1 ou 2, comprenant, en pourcentage pondéral : 3. Panel according to claims 1 or 2, comprising, in weight percentage:
- 60 à 75%, de préférence 70 à 75%, de moelle de tournesol, - 60 to 75%, preferably 70 to 75%, of sunflower marrow,
- 12 à 15% de liant, - 12 to 15% binder,
- 8 à 10% d’au moins un pigment, - 8 to 10% of at least one pigment,
- 2 à 3% d’agent anti-moisissure, - 2 to 3% anti-mold agent,
- la somme des composants n’excédant pas 100%. - the sum of the components not exceeding 100%.
4. Panneau selon l’une quelconque des revendications 1 à 3, dans lequel la moelle de tournesol est utilisée à raison d’une masse volumique de 50 kg/m3 à 200kg/m3. 4. Panel according to any one of claims 1 to 3, wherein the sunflower pith is used at a density of 50 kg/m 3 to 200 kg/m 3 .
5. Panneau selon l’une quelconque des revendications 1 à 4, dans lequel la moelle de tournesol a une granulométrie comprise entre 3 et 15 mm, de préférence entre 5 et 12 mm, ou le broyât de tournesol a une granulométrie comprise entre 3 et 50 mm, de préférence entre 5 et 20 mm. 5. Panel according to any one of claims 1 to 4, in which the sunflower pith has a particle size between 3 and 15 mm, from preferably between 5 and 12 mm, or the sunflower mash has a particle size of between 3 and 50 mm, preferably between 5 and 20 mm.
6. Panneau selon l’une quelconque des revendications 1 à 5, caractérisé en ce qu’il a une épaisseur comprise entre 1 et 100 mm, de préférence 2 à 50 mm. 6. Panel according to any one of claims 1 to 5, characterized in that it has a thickness of between 1 and 100 mm, preferably 2 to 50 mm.
7. Panneau selon l’une quelconque des revendications 1 à 6, caractérisé en ce que le pigment est choisi parmi les pigments minéraux ou organiques. 7. Panel according to any one of claims 1 to 6, characterized in that the pigment is chosen from mineral or organic pigments.
8. Panneau selon l’une quelconque des revendications 1 à 7, caractérisé en ce que l’agent conservateur est un agent anti-moisissures. 8. Panel according to any one of claims 1 to 7, characterized in that the preservative is an anti-mold agent.
9. Panneau selon l’une quelconque des revendications 1 à 8, qui est un panneau plan, un panneau courbe, ou un panneau comportant au moins deux pans inclinés l’un par rapport à l’autre. 9. Panel according to any one of claims 1 to 8, which is a flat panel, a curved panel, or a panel comprising at least two sides inclined relative to each other.
10. Procédé de fabrication d’un panneau selon l’une quelconque des revendications 1 à 9, comprenant les étapes suivantes : 10. A method of manufacturing a panel according to any one of claims 1 to 9, comprising the following steps:
- préparation du mélange comprenant la moelle de tournesol ou le broyât de tournesol, le liant, et de manière optionnelle, au moins un pigment, - preparation of the mixture comprising the sunflower pith or the ground sunflower, the binder, and optionally, at least one pigment,
- pulvérisation d’eau sur le mélange, - spraying water on the mixture,
- pressage à chaud du mélange dans un moule, et - hot pressing of the mixture in a mould, and
- démoulage du panneau ainsi obtenu. - demoulding of the panel thus obtained.
11. Utilisation d’un panneau selon l’une quelconque des revendications 1 à 9 pour revêtir un support, en particulier pour un revêtement mural. 11. Use of a panel according to any one of claims 1 to 9 for covering a support, in particular for a wall covering.
12. Utilisation d’un panneau selon l’une quelconque des revendications 1 à 9 en tant que panneau de régulation thermique et/ou pour isolation phonique.12. Use of a panel according to any one of claims 1 to 9 as a thermal control panel and / or for sound insulation.
13. Procédé de régulation thermique d’une surface, dans lequel on applique sur ladite surface un panneau selon l’une quelconque des revendications 1 à 9. 13. A method of thermal regulation of a surface, in which a panel according to any one of claims 1 to 9 is applied to said surface.
14. Procédé d’isolation phonique d’une surface, dans lequel on applique sur ladite surface un panneau selon l’une quelconque des revendications 1 à 9.14. A method of soundproofing a surface, in which a panel according to any one of claims 1 to 9 is applied to said surface.
15. procédé selon l’une des revendications 13 ou 14, dans lequel ladite surface est une paroi de bâtiment. 15. Method according to one of claims 13 or 14, wherein said surface is a building wall.
PCT/FR2022/051244 2021-06-24 2022-06-23 Panels based on sunflower pith WO2022269205A1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19610247A1 (en) * 1995-08-08 1997-02-13 Peter Dr Schopf Recovery of sunflower and other stems - cuts them into lengths to be dried and mixed with bonding agents for use as insulation and construction materials
EP0987089A1 (en) * 1998-09-16 2000-03-22 Toulousaine de Recherche et de Developpement "T.R.D." Société Anonyme Method for making shaped objects from a vegetable raw material by pressing
FR2863193A1 (en) * 2003-12-05 2005-06-10 Bsm Dev Flat, solid and biodegradable structural component is made from cerealbased material with bonding agent, optionally coloured in the mass
WO2018083421A1 (en) * 2016-11-03 2018-05-11 Parexgroup Sa Multilayer insulating construction system for a building - manufacturing process thereof - dry composition of use in this manufacture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19610247A1 (en) * 1995-08-08 1997-02-13 Peter Dr Schopf Recovery of sunflower and other stems - cuts them into lengths to be dried and mixed with bonding agents for use as insulation and construction materials
EP0987089A1 (en) * 1998-09-16 2000-03-22 Toulousaine de Recherche et de Developpement "T.R.D." Société Anonyme Method for making shaped objects from a vegetable raw material by pressing
FR2863193A1 (en) * 2003-12-05 2005-06-10 Bsm Dev Flat, solid and biodegradable structural component is made from cerealbased material with bonding agent, optionally coloured in the mass
WO2018083421A1 (en) * 2016-11-03 2018-05-11 Parexgroup Sa Multilayer insulating construction system for a building - manufacturing process thereof - dry composition of use in this manufacture

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