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Publications (47)
Developing composite materials has become an attractive option to incorporate thermoplastic waste into a circular economy model; for that thing, natural fibers are used to improve the properties of the biomaterial to be consistent with multiple industrial sectors. The study aimed to evaluate the compatibility of M. textilis fiber combined with recy...
Dipteryx panamensis and Hieronyma alchorneoides are two species of high specific gravity used in reforestation programs in Costa Rica, but they lack products with structural value for commercialization. In order to introduce the wood of these two species in the market, the objective was established to study the behavior of solid timber beams and gl...
Musa textilis también conocido como abacá, es un producto no maderable proveniente del bosque, que produce una fibra natural que se extrae del pseudotallo de la planta. Es un cultivo de exportación y su producción está en manos de pequeños productores. El manejo de este cultivo a nivel de finca es compatible con las políticas y estrategias de biodi...
Physical-mechanical properties of three-layer counter-laminated boards (CLT) were determined, made with Tectona grandis and Gmelina arborea wood, from forest plantations. Two types of adhesive were used, isocyanate polymer emulsion (EPI) and pre-catalyzed vinyl acetate modified with 3% nanoclay (PVA-na). They applied two treatments to activate the...
Knowing the genotypes of Musa textilis and its fiber production properties is key for developing cultivars with homogeneous properties and focusing on specific products or market segments that generate added value to the fiber. For this reason, the objective was to determine the optimal use of five genotypes of M. textilis (MT01, MT03, MT07, MT11,...
Evaluation of the glue line in CLT panels and in other wood composite products in general is of great interest. Non-destructive methods such as determination of the velocity of ultrasound waves going through the materials are commonly applied to evaluate wood products. The present work is aimed at mapping ultrasound velocity (UV) to identify proble...
Los bosques tropicales son ecosistemas que brindan a las personas una serie de servicios como agua, biodiversidad, madera, absorción de dióxido de carbono, productos no maderables, dendro-energía y también belleza escénica.Es por esto que la Ingeniería Forestal cumple un papel importante, ya que no solo promueve la conservación sino que también el...
Physical and mechanical properties were evaluated on cross-laminated panels (plywood) fabricated with three plantation species (Cordia alliodora, Gmelina arborea and Vochysia ferruginea) from tropical climates in Costa Rica. The panels were glued with urea-formaldehyde resin modified with nanoclay at four concentrations (0,75; 1,00; 1,50 and 2,00 %...
Tectona grandis is the second most important species for reforestation in Costa Rica, and any improvement in its industrialization process is important, especially the drying process. Lumber obtained from a plantation of 12-year-old Tectona grandis trees was used to evaluate three drying schedules that include integrated steaming processes to deter...
The study compared drying speed between schedules rather than reducing drying time, by employing high daily drying rate (DRdaily) for Tectona grandis wood. The moisture content (MC), drying defects (twists, bows, cups, crooks, checks and splits), drying tensions and colour changes were evaluated. Results showed that it was possible to dry wood in 8...
The authors investigated modifying schedules to increase the drying rate (DR) and reduce the total drying time for Tectona grandis L. wood from juvenile plantations. The initial MC ranged from 92% to 115%. A conventional teak schedule was used as the basis for developing two faster drying schedules and for comparison. The modifications resulted in...
Las curvas laminadas fabricadas con chapas vaporizadas permiten obtener radios de curvatura más pequeños que cuando no se aplica este proceso. En este estudio, se presentan el comportamiento de madera de Alnus acuminata, Tectona grandis, Gmelina arborea, Terminalia oblonga, Alnus acuminata y Swietenia macrophylla provenientes de plantaciones de ráp...
Este estudio es una propuesta para dar un aprovechamiento y uso a los residuos industriales delaserrío de la madera de Pinus patula para la elaboración de tableros aglomerados de partículas. Por lotanto, los objetivos fueron manufacturar tableros aglomerados de partículas homogéneos a dos nivelesde densidad, determinar sus propiedades físico-mecáni...
This study is a proposal to generate uses of industrial residues from sawmills of Pinus patula wood for the manufacturing of particleboards. The aims are to manufacture homogeneous particleboards with two density levels, determine their physical and mechanical properties and evaluate the results with German and Venezuelan standards. The average wat...
Based on ASTM standards D 2395-02 and D 143-94, total and normal shrinkage in radial (RS), tangential (TS) and volumetric (VS) directions and the total and normal TS/RS ratio were determined in the plantation woods Acacia mangium Willd., Tectona grandis L.f. and Terminalia amazonia A. Chev. Also, physical properties such as basic specific gravity (...
It was studied the variability in morphological, physical and thermal properties of fiber bark of Eucalyptus nitens (Deane & Maiden) coming from twenty four trees, two sites and six families; using techniques such as conventional light microscopy, electron microscopy (SEM) and thermo-gravimetric analysis (TGA). Such properties are relevant for a li...
Elaeis guineensis, Ananas comusus and forest plantations are planted widely in Costa Rica; however
their residues (8000 t) are not utilised. The main objective of this work was to undertake an anatomical
description of the structure of the oil palm’s empty fruit and the leaves from the crown and plant of the
pineapple. Fibre dimensions of these agr...
Plantation wood from tropical climate has been introduced rapidly in the national market; however, there is lack of knowledge about the process. The main objective of this study was to investigate the kiln drying behavior of 10 plantation-grown wood species from natural forest in Costa Rica using the recommended drying schedule. Initial moisture co...
Se determinó el módulo elástico de Young (MOE),mediante tres métodos, en tableros contrachapados decinco capas de madera de Eucalyptus nitens. El métodocontrol obtuvo la menor variabilidad (CV= 22,45 %),mientras que la mayor correspondió al método 3 (CV=29,91 %). Sin embargo, el ANOVA indicó que no existediferencia significativa entre las medias de...
In this study, Eucalyptus nitens species was nano-characterized to determine variability in nanomechanical properties within the cellular ultra-structure between the bark and wood fibers. Three factors, including site (2 levels), family (2 levels) and fiber type (bark and wood) were analyzed using three response variables, including the elastic mod...
The laminated curves (LC) made with steamed veneers make possible to obtain smaller curvature radius (RC) than when this process is not applied. This research shows the behavior of Alnus acuminata, Tectona grandis, Gmelina arborea, Terminalia oblonga and Swietenia macrophylla -all originated from fast growth plantations- in the manufacture of lamin...
Laminated products, such as laminated veneer lumber (LVL) or plywood (PW), have become important recently. The objective of
this study was to determine and compare properties of panels fabricated with veneers of Gmelina arborea trees in a fast-growth plantation and glued with phenol formaldehyde resin. The results showed that LVL and PW physical an...
Comparative study on physical and mechanical properties of laminated veneer lumber and plywood panels made of wood from fast-growing Gmelina arborea trees Abstract Laminated products, such as laminated veneer lumber (LVL) or plywood (PW), have become important recently. The objective of this study was to determine and compare properties of panels f...
ABSTrACT The laminated curves (LC) made with steamed veneers make possible to obtain smaller curvature radius (RC) than when this process is not applied. This research shows the behavior of Alnus acumi-nata, Tectona grandis, Gmelina arborea, Terminalia oblonga and Swietenia macrophylla –all originated from fast growth plantations– in the manufactur...
Physical and mechanical properties of eight fast-growing plantation species in Costa Rica. Wood properties of Acacia mangium (Am), Alnus acuminata (Aa), Bombacopsis quinata (Bq), Cupressus lusitanica (Cl), Swietenia macrophylla (Sm), Terminalia amazonia (Ta), Terminalia oblonga (To) and Vochysia guatemalensis (Vg) planted in Costa Rica were determi...
Wetwood is commonly reported in temperate species but not so in tropical species. In an old Gmelina arborea Roxb. plantation, wetwood was identified by a darker colour compared with the rest of heartwood; by a higher moisture content (average 182%); and a lower specific gravity (0.34, compared with 0.38 for sapwood and heartwood). Tangential shrink...
Gmelina arborea is one of the most important species for plantation in tropical areas. However, high variability in final moisture content
(MCf) is a problem in the drying process. This study sought to determine the variability in MCf in relation to distance from the pith (DP), and anatomic elements. Boards of 1.2 cm in thickness obtained from bark...
In drying Gmelina arborea there are usually great differences in the final moisture content (MCf) between and within boards. In this research, the causes for the unevenness of MCf were studied. Wood from two young plantations (six years old) and two older plantations nearing rotation age, i.e. 10 to 12 years were sampled. The large variation in MCf...
Due to its excellent growth rate and productivity, Gmelina arborea (Roxb.) is widely used for commercial reforestation in Costa Rica. However during the lumber drying process, the wooden boards show non-uniform values of final moisture content (MC). The low uniformity in final MC is caused by the presence of " wet pockets " , originated during the...
Gmelina (Gmelina arborea) is the most planted forest species in Costa
Rica. It is estimated that approximately 24000 ha are to be found, mainly within the
geographic regions of the Pacifico Seco and Huetar Norte; this represents 44,4% of the
total planted in the country as a whole (54000 ha). However, technical information
regarding the seasoning o...
Boron compounds are used as indoor wood preservatives, they have some advantages
compared to other products such as: do not change the natural color of the wood, low
toxicity for humans, fire retardant properties and highly effective against decay fungi
and insects. In this research the penetrability of two boron compounds in wood (borax
and boric...
Exotic and native species had wide been planted in reforestation program in several tropical countries, with excellent developed in tree diameter and productivity. However, some problems are noted: wood properties and industrial performance are different when wood came this condition. There was began a research about dry behavior of drying time of...
