YIELD IN SAWN WOOD AND RESIDUE UTILIZATION OF Qualea paraensis DUCKE AND Erisma uncinatum WARM

Abstract

The study was developed in Nova Maringá -MT. The objectives of this work were to evaluate the sawn timber yield, the use of wood residues and the quantification of products for the species Qualea paraensis (cambará) and Erisma uncinatum (cedrinho) in three diametric classes: Class A -40.0 to 49.9 cm; Class B -50.0 to 59.9 cm; Class C -60.0 to 69.9 cm. Four replicates per class were evaluated, totaling 12 logs per species of varied lengths. The sawn timber yield did not show a statistical difference between diametric classes for both species. Average yield for Qualea paraensis was equal to 43.97% and for Erisma uncinatum, 42.05%. The residues use increased the total yield in 4.40% and 6.52% for Qualea paraensis and Erisma uncinatum, respectively. For Erisma uncinatum, the sawed products with the highest production were the board in the primary unfolding and the short board in the residues use. As for Qualea paraensis, there was more production of rafters and short battens in the same processes. ResumoRendimento em madeira serrada e aproveitamento dos resíduos de Qualea paraensis ducke e Erisma uncinatum warm. Produção de madeira serrada e utilização de resíduos de Qualea paraensis Ducke e Erisma uncinatum quente. O estudo foi desenvolvido no município de Nova Maringá -MT e os objetivos foram avaliar o rendimento em madeira serrada, o aproveitamento dos resíduos madeireiros e a quantificação dos produtos serrados produzidos para as espécies Qualea paraensis (cambará) e Erisma uncinatum (cedrinho) em três classes diamétricas: Classe A -40,0 a 49,9 cm; Classe B -50,0 a 59,9 cm; Classe C -60,0 a 69,9 cm, com quatro repetições por classe, totalizando 12 toras por espécie de comprimentos variados. O rendimento em madeira serrada não apresentou diferença estatística entre classes diamétricas para as duas espécies, sendo o rendimento médio para a Qualea paraensis igual à 43,97% e para a Erisma uncinatum igual à 42,05%. O aproveitamento dos resíduos aumentou em 4,40% e 6,52% o rendimento total do desdobro das toras das espécies Qualea paraensis e Erisma uncinatum, respectivamente. Para a espécie Erisma uncinatum os produtos serrados com maior produção foram a tábua no desdobro primário e a tábua curta no aproveitamento dos resíduos, enquanto que, para a espécie Qualea paraensis houve maior produção de caibro e sarrafo curto nos mesmos processos. Palavras-chave: serraria, madeira tropical, produtos madeireiros. _______________________________________________________________________________________

Tropical tree quality and sawmill yield in the amazon rainforest

“…The lumber yield of Q. paraensis was lower than those found by Melo et al (2016) when evaluating Qualea sp. and by Stragliotto et al (2019) when evaluating Q.…”

Volumetric yield coefficient: the key to regulating virtual credits for Amazon wood

“…Even with the presence of hollow areas in some of the logs, the average CRV of D. excelsa was 48.9% (see Figure 2), which is 80% higher than the upper limit of the confidence interval of the overall mean of our sample (27.1%). The volume of the lumber affects the lumber yield in Amazon species, as there is a negative relationship between the number of passes of a log through the saw and the yield, hence the CRV (Stragliotto et al 2019).…”

Quality of raw material and yield of exported sawn wood in the rational use of tropical timber from the Amazon

“…Normally, this is manifested in generation of a large volume of waste, which causes an increase in the cost of the nal product. Although recent studies have been conducted to evaluate the sawn timber yield of Amazonian species (Santos et al 2017;Mendoza et al 2019;Stragliotto et al 2019; Lima et al 2020). There is little information on the yield of tropical species for the Amazon region, despite the potential of wood and the important role of this region in supplying this raw material to the market (Luz et al 2021).…”

“…Few studies in the literature evaluate the yield of sawn timber of tropical Amazonian species, associating the quality of the logs as an important factor to explain the yield of certain species, such as the study by Luz et al (2021). In general, the vast majority of studies in the literature analyzing this topic address only the log diameter class (Melo et al 2019;Stragliotto et al 2019;Lima et al 2020). Some quality characteristics of logs are important, such as conicity, attening, curving, buttresses, cracks and net volume, as mentioned in the Standard for Classi cation of Hardwoods (IBDF 1984).…”