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DIBéTOU (Lovoa trichilioides)
Nom commercial
Dibétou
Nom scientifique (avec auteur)
Lovoa trichilioides Harms
Famille
MELIACEAE
Noms communs (pays)
Wnaimei (Sierra Leone); Apopo (Nigeria); Noyer d'Afrique (France); Noyer du Gabon (France); Noyer d` Afrique (France); Congowood (United States of America); Tigerwood (United States of America); Tigerwood (United Kingdom); African walnut (United Kingdom); Embero (Equatorial Guinea); Nivero (Equatorial Guinea); Bombulu (Zaire); Lifaki-muindu (Zaire); Eyan (Gabon); Bibolo (Cameroon); Anamenila (Nigeria); Sida (Nigeria); Apolo (Nigeria); Mpengwa (Ghana); Dubini-biri (Ghana); Dibetou (Côte d`Ivoire)
Synonymes du nom scientifique (avec auteurs)
Lovoa pynaertii De Wild.; Lovoa klaineana Pierre ex Sprague
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of 50 m, with trunk diameters of 100 cm. The bole is usually straight, clear and cylindrical to 20 to 30 m in length, with short buttresses.
Habitat naturel
Lovoa trichilioides occurs in evergreen and deciduous forest, generally in moist sites. Regeneration occurs only in canopy gaps. National conservation status in Cote d`Ivoire V, Liberia E. It is known or inferred that the harvesting of specimens from the
Répartition naturelle
West Africa, from Sierra Leone to Gabon.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 150 to 200 micras (medium). Brown-colored deposits in heartwood vessels. Non-vestured pits. Vessels per mm2 6 to 10 (medium). Simple perforation plat Apotracheal axial parenchyma diffuse and/or diffuse in aggregates. Paratracheal axial parenchyma scanty and/or vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 3 to 4 cells per parenchyma strand. 4 to 10 rays per mm (medium). Rays non-storied. Rays 1 to 4 seriate. Homogeneous rays and/or sub-homogeneous rays (all ray cells procumbent). Body ray cells procumbent with one row of upright and/or square marginal cells (Kribs-III). Occasionally septate fibers present. Fibers with simple to minutely bordered pits.
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is light grey to light yellow, it has a thickness of up to 7 cm. The heartwood is grey-brown to yellow-brown, sometimes with dark veins, it is clearly demarcated. The silver figure is fine.
Index de Teinte (1 = Noir, 7 = Jaune clair)
2
Grain
It has highly interlocked grain; special care is needed when drying because of frequent risks of distortion.
Texture
Texture is reported to be fine to medium.
Luster
The wood surface is described as low in luster.
Durabilité naturelle
Slightly durable to decay. This species needs preservative treatment for uses with risks of occasional re-humidification. It is not suited for uses with risks of permanent or long-lasting humidification. Sensible to termites attack. The heartwood is resistant.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
6
Tensions internes de croissance
Residual growth stresses are absent.
Résistance à l'imprégnation
Difficult to treat with only a low penetration of the preservative products.
PROPRIÉTÉS PHYSIQUES DU BOIS
Densité basale ou gravité spécifique (poids anhydre/vol. saturé) (g/cm³)
0.49
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.53
Retrait tangentiel total (saturé à 0%TH) (%)
5.8
Retrait radial total (saturé à 0%TH) (%)
3.7
Défauts dus au séchage
Ease of Drying: Drying is moderately easy; some particular care is needed. Drying Defects: Risks of distortions when interlocked grain is present. Kiln Schedules: The kiln schedule has been tested.
Calendrier de séchage en séchoir recommandé
FR-6
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
1.6
Calendrier de séchage en séchoir
http://www.tropicaltimber.info/wp-content/uploads/2015/09/KD_French.pdf
PROPRIÉTÉS CHIMIQUES DU BOIS
PROPRIÉTÉS MÉCANIQUES DU BOIS
Résistance à la flexion (module de rupture_MOR) 12%TH (kgf/cm²)
733
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
106637
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
482
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
59
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
63
Dureté Janka (latérale) 12%TH (kgf)
349
Dureté Janka (extrémités) 12%TH (kgf)
452
OUVRABILITÉ
Sciage
It is easy to saw.
Coupe de placage de déroulage
Suitable for slicing, also suitable for peeling if treated.
Placage tranche
Suitable for slicing, also suitable for peeling if treated.
Effet d'émoussement
Slight blunting effect; ordinary tools can be used for sawing and machining.
Usinage
Machining of this species is reportedly easy.
Rabotage
Easy; no particular problems.
Moulurage
Moderately easy; tools must be cautiously sharpened.
Tournage
30
Perçage
Moderately easy; tools must be cautiously sharpened.
Mortaisage
Moderately easy; tools must be cautiously sharpened.
Clouage
No particular problem.
Collage
Glues well if basic gluing technical rules are followed.
Ponçage
Easy to perform; it gives good results.
Polissage
Can be polished without surface preparation.
Cintrage à la vapeur
This species can be used for steam bending.
Compatibilité avec outils manuels
No particular problems.
UTILISATIONS
UTILISATIONS FINALES (RÉSUMÉ)
HOUSING GENERAL, beams, joists, boards, frames, steps, panelling, fittings, FURNITURE AND CABINETS, luxury furniture, cabinets, PLYWOOD AND VENEER, faces, Decorative veneer, TURNING, ornaments, turned furniture, cutlery, lasts, OTHER AND MUSICAL INSTRUMENTS, handicrafts
MEUBLES ET M. DE RANGEMENT
- 10 - Silica in Timbers
Pouters
- 11 - Prospect: The wood database
Solives
- 12 - Tropical timbers of the world. Part I-Tropical American Species
Planches
- 13 - Dry kiln schedules for commercial woods. Temperate and tropical. Section III. Latin American (Mexico, Central, and South America) Woods–Conventional Temperatures
Cadres
- 16 - Woods of the World
Marches
- 17 - Tree Conservation Database
Panneaux
- 18 - W3TROPICOS Missouri Botanical Garden
Accessoires en bois
- 19 - Silica in Timbers
MEUBLES ET M. DE RANGEMENT
- 21 - Tropical timbers of the world. Part III-Southeast Asian and Oceanian Species.
Meubles luxe
- 22 - Dry kiln schedules for commercial woods. Temperate and tropical. Section IV-Asian and Oceanian Woods
Armoires
- 24 - Empire Timbers
PANNEAUX ET PLACAGE
- 25 - Directory of Timber Trade Malaysia
Faces (de placage)
- 26 - Annual Review and Assessment of the World Timber Situation 1998-ITTO
Placage tranché
- 28 - Ministry of Agriculture, Fisheries & Forest of Fiji
Tournage
- 30 - Embassy of Honduras in Japan
Ornements
- 31 - Embassy of Colombia in Japan
Ornements
- 32 - Embassy of Cote d`Ivoire in Japan
Manches de couverts
- 33 - Embassy of Gabon in Japan
Formes à chaussures
- 34 - Embassy of Indonesia in Japan
Artisanat
- 66 - Maderas latinoamericanas. VII. Caracteristicas anatomicas. propiedades fisicomecanicas, de secado, y tratabilidad de la madera juvenil de Cordia alliodora (Ruiz & Pav. Oken.)
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