LANDA (Erythroxylum mannii)
Nom commercial
Landa
Nom scientifique (avec auteur)
Erythroxylum mannii Oliv.
Famille
ERYTHROXYLACEAE
Noms communs (pays)
Dabé (Côte d`Ivoire); Nkanza (Zaire); Landa (Cameroon); Pepesia; N`kanza; N`dabe; Luzinzou; Lukienzo; Ditsumi; Dabe; Bimini; Landa
DESCRIPTION DE L'ARBRE
Description botanique
The tree reaches a height of about 30 m. The bole is variable, sometimes up to 20 m in length. The trunk diameter attains 130 to 150 cm.
Habitat naturel
Répartition naturelle
West and Central Africa, sporadically from Sierra Leone to the Democratic Republic of the Congo.
IDENTIFICATION DU BOIS
Description anatomique du bois
Wood diffuse porous. Occasionally vessels exclusively solitary (over 90%). Tangential diameter of vessel lumina 100 to 150 micras (small). Tyloses thin walled. Non-vestured pits. Vessels per mm2 more than 20 (very abundant). Simple perforation plates. Vessel-ray Paratracheal axial parenchyma scanty and/or vasicentric. Prismatic crystals in chambered axial parenchyma cells and/or in fibers. 5 to 8 cells per parenchyma strand. Rays more than 10 per mm (abundant). Rays non-storied. Rays 1 to 4 seriate. Non-septate fibers. Fibers with simple to minutely bordered pits.
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Vue macroscopique du bois (plan tangentiel)
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Vue microscopique d'une section transversale du bois
Disponibilité
Statut CITES
Unrestricted
DESCRIPTION GÉNÉRALE DU BOIS
Teinte
The sapwood is grey with a copper sheen. The heartwood is pink or red-brown. The timber is characterized by numerous pith flecks noticeable as dark lines (2.5 to 5 cm) long, it is clearly demarcated. It has a mottled or broken stripe figure.
Index de Teinte (1 = Noir, 7 = Jaune clair)
5
Grain
The grain is slightly but systematically interlocked; special care is needed when drying because of frequent risks of distortion.
Texture
The wood is frequently reported to be fine textured.
Luster
It is reported to be low in luster.
Durabilité naturelle
Very durable to decay; without preservative treatment. This species is especially suited for all the uses with risks of permanent or long-lasting humidification. Resistant to termites attack. Heartwood is resistant to Lyctus attacks.
Index de durabilité naturelle (1 = Très élevée, 7 = Très faible)
1
Tensions internes de croissance
No residual stresses are reported in this species.
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)
0.60
Densité sèche à l'air (poids et volume à 12%TH) (g/cm³)
0.66
Retrait tangentiel total (saturé à 0%TH) (%)
8.8
Retrait radial total (saturé à 0%TH) (%)
3.8
Défauts dus au séchage
Ease of Drying: Drying is rather slow and sometimes difficult to perform. Drying Defects: Risks of checks and distortions. Kiln Schedules: The kiln schedule has been tested.
Calendrier de séchage en séchoir recommandé
FR-7
Ratio de stabilité dimensionnelle (% retrait tangentiel total/% retrait radial total)
2.3
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)
924
Rigidité (module d'élasticité_ MOE) 12%TH (kgf/cm²)
142606
Résistance à la compression parallèle à la fibre 12%TH (kgf/cm²)
539
Résistance à la compression perpendiculaire à la fibre 12%TH (kgf/cm²)
69
Résistance au cisaillement (radial) 12%TH (kgf/cm²)
74
Dureté Janka (latérale) 12%TH (kgf)
543
Dureté Janka (extrémités) 12%TH (kgf)
644
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
Easy; no particular problems.
Perçage
Easy; no particular problems.
Mortaisage
Easy; no particular problems.
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, flooring, parquet, frames, steps, panelling, fittings, FURNITURE AND CABINETS, common furniture, PLYWOOD AND VENEER, faces, Decorative veneer, CONTAINERS, truck bodies, truck flooring, NAVAL CONSTRUCTION, boat deck, port storage
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
Planchers
- 14 - Handbook of Hardwoods
Parquets
- 15 - Empire Timbers
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 ordinaire
- 23 - Handbook of Hardwoods
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
Carros_camion
- 53 - Timbers of the New World
Wagons
- 54 - Bulletin of the Government Forest Experiment Station N.157: Identification of Tropical Woods
CONSTRUCTION NAVALE
- 55 - Tropical Timber Atlas of Latin America
Navires_ponts
- 59 - Programa Nacional de uso Sostenible de los Bosques e Incremento a las Exportaciones.
Port entreposage
- 62 - Estudio Tecnológico de Maderas del Perú (Zona Pucallpa) Vol I
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