Materials for sengon and jabon LVL

44 Table 7 Trees information for poplar cultivars and douglas-fir LVL Wood Species Growth Site Age years dbh cm Poplar cultivar A4A P. deltoids Bartr. x P. nigra L. Bussy les Daours, Clarques and Argenton, France 12-13 41-49 Poplar cultivar Brenta P. deltoids Bartr. x P. nigra L. Sainte Hermine and Saint Nicholas la Chapelle, France 18 43-50 Poplar cultivar I-214 P. deltoids Bartr. x P. nigra L. Saint Nicholas la Chapelle and La Rèole, France 18 47-50 Poplar cultivar Koster P. deltoids Bartr. x P. nigra L. Sainte Hermine and La Rèole, France 18 50-52 Poplar cultivar Lambro P. deltoids Bartr. x P. nigra L. Sainte Hermine and La Rèole, France 17 47-53 Poplar cultivar Mella P. deltoids Bartr. x P. nigra L. Saint Nicholas la Chapelle and La Rèole, France 17-18 39 Poplar cultivar Polargo P. deltoids Bartr. x P. nigra L. Bussy les Daours, Epieds, and Saint Jean dAngely, France 13 44 Poplar cultivar Soligo P. deltoids Bartr. x P. nigra L. Sainte Hermine and Saint Nicholas la Chapelle, France 18 48-54 Poplar cultivar Taro Populus sp. x Populus sp. Saint Nicholas la Chapelle and La Rèole and Blanzay sur Boutonne, France 17-18 41-63 Poplar cultivar Triplo P. deltoids Bartr. x P. nigra L. Vervant, Saint Jean dAngely and Bussy les Daours, France 13-14 38-47 Poplar cutivar Alcinde P. deltoids Le Busseau, Vervant and Saint Jean d’Angely, France 13-19 46 Poplar cutivar Dvina P. deltoids Sainte Hermine, Blanzay sur Boutonne and La Rèole, France 17-18 42-52 Poplar cutivar Lena P. deltoids Sainte Hermine and La Rèole, France 17-18 52-58 Poplar cutivar Trichobel P. trichocarpa x P. trichocarpa Le Busseau, Long and Vauchelle le Authis, France 14-22 43-47 Douglas-fir Pseudotsuga menziesii Cluny, France 26 34-35 After felling trees, the poplar and douglas-fir logs were debarked and cut in length of 60 cm for peeling process. The total logs were 38 pieces 33 poplar logs and 5 douglas-fir logs. The sample logs were wrapped in plastics, kept cold, and maintained in the green condition before they were transported to the wood workshop for the rotary cutting.

4.4 Method for production of sengon and jabon LVL

The peeling process and LVL production of sengon and jabon were performed at Division of Wood Quality Improvement, Forest Product Department Faculty of Forestry Bogor Agricultural University, Indonesia. 4.4.1 Peeling process 4.4.1.1 Sengon and jabon logs preparation for rotary cutting Tree rings have been used for a long time in areas outside the tropics to characterize the presence of juvenile and mature wood. Considering distinct growth rings are absence in sengon and jabon trees, segmented ring was considered to be practically useful for characterizing their juvenility. A specified 1 cm width of segmented rings was made from pith to bark on the cross section of logs and numbered consecutively No. 1-7 as shown in Figure 10.