YIELD OF A PORTABLE SAWMILL AND WOOD DRYING OF Hovenia dulcis IN CONVENTIONAL KILN

Raquel Marchesan,Márcio Pereira Da Rocha,Claudio Gumane Francisco Juízo,Morgana Cristina França,Pedro Lício Loiola,Ricardo Jorge Klitzke

doi:10.5380/rf.v49i1.57053

Raquel Marchesan, Márcio Pereira Da Rocha + Show 4 more

Open Access

https://doi.org/10.5380/rf.v49i1.57053

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Abstract

The objective of this work was to evaluate the yield of sawn wood and the operational efficiency in the sawing of Hovenia dulcis logs in a portable sawmill, as well as to evaluate the behavior of the wood in conventional kiln drying. For this purpose, five trees were selected, from which 14 logs of 1.8 meters in length were obtained to determine the volume, the yield of two diametric classes (20 to 24 and 24.1 to 28 cm) and the operational efficiency during the sawing of the logs. For the drying process, the parameters of initial temperature, final temperature and drying potential were obtained from the drastic drying method at 100ºC. The yield results showed that there were no statistical differences between the two diametric grades. For operational efficiency, the highest diameter class (1.00m³/worker/day) was higher than the lower diameter class (0.70m²/worker/day). For the drying of Hovenia dulcis wood, it is possible to consider this species as a difficult drying type according to the parameters found for the elaboration of the drying programs. In addition, the moisture loss of the wood occurred slowly due to its low permeability.

Highlights

Hovenia dulcis Thunberg is an arboreous species of great size and natural occurrence in Eastern Asia, mainly in the islands of Japan, China and Korea (CARVALHO, 2004)
This study aimed to evaluate the yield of lumber and operational efficiency in sawing timber into a portable sawmill as well as the behavior of wood Hovenia dulcis in conventional drying
In order to determine the yield and the operational efficiency, through the cutting, five trees selectively chosen depending on the needs of specimens with straight shank, in perfect state of sanity and by means of the cutting and subsequent drying of the wood of Hovenia dulcis, representing the species at random

Summary

Introduction

Hovenia dulcis Thunberg (grape from Japan) is an arboreous species of great size and natural occurrence in Eastern Asia, mainly in the islands of Japan, China and Korea (CARVALHO, 2004). In south Brazil, it is widespread by the states of Santa Catarina and Rio Grande Do Sul and by the southwest of Paraná. It is considered an invasive species by environmental agencies due to its easy dispersion and adaptability (SUSIN et al, 2014). Farmers commonly use alternative methods, such as portable sawmills in the mechanical processing of species used in small-scale, since they have commercial advantages making a small forest parcel which could not be exploited, producing timber for its own demand and reducing transportation costs and fixed capital. According to Juizo et al (2015), the processing of saw logs can be economically unviable in fixed sawmills due FLORESTA, Curitiba, PR, v. 49, n. 1, p. 079-088, Jan / Mar. 2019

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