Lumber Yield of Four Native Forest Species of the Amazon Region

Melo, Rafael Rodolfo de; Dacroce, Jessyca Mayra Fruett; Junior, Francisco Rodolfo; Lisbôa, Gerson dos Santos; França, Luciano Cavalcante de Jesus

doi:10.1590/2179-8087.031116

Cited by 18 publications

(10 citation statements)

References 3 publications

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“…3f and 3b). The values found for this species were similar to those found by Lima et al (2020) and higher than those found by Melo et al (2019).…”

Section: Discussionsupporting

confidence: 89%

Tropical tree quality and sawmill yield in the amazon rainforest

Casagrande

2023

Preprint

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The low sawn timber yield of tropical species is caused by quality of the logs, among other factors. The objective was to evaluate the quality of logs and the sawn wood yield for export of the tropical species. The log quality parameters analyzed were conicity, flattening, curving, buttresses, cracks, heartwood percentage and net volume. The yield of sawn timber for export differed between species and ranged There was variation in the quality of the logs and the yield of sawn timber for export due to the distinctive characteristics of the species evaluated.

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“…3f and 3b). The values found for this species were similar to those found by Lima et al (2020) and higher than those found by Melo et al (2019).…”

Section: Discussionsupporting

confidence: 89%

Tropical tree quality and sawmill yield in the amazon rainforest

Casagrande

2023

Preprint

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“…Therefore, the volume yield is affected by different parameters, of which some are manageable, such as the log dimensions, while others, unfortunately, are nonavoidable, such as the defects and cracks. For example, the logs of the same diameter class may give yield values characterized by a low variation [3,11,40], especially in small sawmills where the machine operator manually chooses the dimensions of the sawn wood and the sawing pattern. To confirm the influence on the variation in performance in our study, Helvoigt and Adams [41] reported similar statistically significant relationships between sawlogs and sawn wood when analyzing the productivity by a 30-year study period in the Pacific Northwest sawmill industry.…”

Section: Discussionmentioning

confidence: 99%

Performance of Small-Scale Sawmilling Operations: A Case Study on Time Consumption, Productivity and Main Ergonomics for a Manually Driven Bandsaw

Borz

Oghnoum

Marcu

et al. 2021

Forests

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Sawmilling operations represent one of the most important phases of the wood supply chain, because they connect the conversion flow of raw materials into finite products. In order to maintain a high volume of processed wood, sawmills usually adopt different processing strategies in terms of equipment and methods, which can increase the value or volume of the lumber produced from logs. In this study, the performance of small-scale sawmilling operations was monitored, whilst also evaluating the exposure of workers to harmful factors. An assessment of time consumption, productivity, and main ergonomics was conducted during the use of a manually driven bandsaw. In addition, the exposure to noise was investigated to complement the knowledge in this regard. The results indicated a rather high time utilization in productive tasks, which may come at the expense of exposure to noise and to poor working postures. The modelling approach resulted in statistically significant time consumption models for different phases (blade adjustment, effective sawing, returning, unloading lumber, and loading and fixing lumber). The exposure to noise was close to 92 dB (A) (8 h) and, therefore, the level of emitted noise is likely to depend on the condition of the used blades, species sawn and on the dimensional characteristics of the logs. In terms of ergonomic risks, the poorest postures were those related to tasks such as moving the logs, loading the logs, fixing the logs, rotating and removing the logs, as well as unloading the lumber.

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“…In spite of the existence of a diversity of factors that can influence yield , the effect of conicity was demonstrated in this study, especially due to the care that was taken to homogenize the sample in terms of length, absence of hollows, final sawn products, besides the effort taken to not influence the decisions of the saw operator. It is important to emphasize that the diameter of the logs can also influence yield for certain species (Biasi and Rocha, 2007;Melo et al, 2019). However, there was no observed pattern of increase or decrease in yield with reduction of diameter from the base to the top of the stem, indicating that conicity probably had a greater influence.…”

Section: Conicity and Yield By Speciesmentioning

confidence: 94%

“…The conventional method of log sawing, in which the saw operator determines how the cuts will be made, still predominates in the Amazon region (Melo et al, 2019). In most cases the decision is random, and this will rarely result in a high level of yield (Biasi and Rocha, 2007).…”

Section: Introductionmentioning

confidence: 99%