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Essai d'un humidimètre NIR pour mesurer la teneur en humidité de bois feuillu

https://library.fpinnovations.ca/en/permalink/fpipub5777
Author
Lavoie, Vincent
Lejeune, Claude
Tanguay, F.
Dupont, Danick
Ding, Feng
Date
March 2013
Edition
39752
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Lavoie, Vincent
Lejeune, Claude
Tanguay, F.
Dupont, Danick
Ding, Feng
Contributor
CRIQ
Date
March 2013
Edition
39752
Material Type
Research report
Physical Description
27 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Drying
Moisture content
Hardwoods
Location
Québec, Québec
Language
French
Abstract
Le mandat du projet consiste en la réalisation d’essais avec un équipement d’acquisition générique NIR (Near Infrared) dans le but de développer des modèles mathématiques pouvant être utilisés pour déterminer le taux d’humidité des planches de bois franc pour quatre essences : le chêne rouge, l’érable à sucre, le merisier et l’érable argenté. Une fois les modèles développés les objectifs plus spécifiques sont d’évaluer le niveau de précision de mesure de la teneur en humidité sur du bois parfaitement équilibré ainsi que déterminer les impacts sur les lectures provenant des facteurs suivants : l’essence, la densité, la qualité de surface, la température du bois, le gradient de teneur en humidité ainsi que la vitesse de passage des planches. Finalement, des essais doivent être réalisés sur du bois provenant directement de l’industrie et n’ayant subi aucun traitement d’équilibrage en laboratoire pour connaître le niveau de précision de lecture dans ces conditions.
MOISTURE METERS
HARDWOODS
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Kiln drying of SPF dimension lumber

https://library.fpinnovations.ca/en/permalink/fpipub7505
Author
Oliveira, Luiz C.
Lazarescu, Ciprian
Star, Phil
Date
April 2015
Edition
49807
Material Type
Research report
Field
Wood Manufacturing & Digitalization
.................................................................................................................................................. 9 3.1 Moisture Content Distribution
Author
Oliveira, Luiz C.
Lazarescu, Ciprian
Star, Phil
Date
April 2015
Edition
49807
Material Type
Research report
Physical Description
17 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Lumber
Spruce Pine Fir
Drying
Moisture content
Language
English
Abstract
In British Columbia, due to the decline of lodgepole pine, mills should expect higher volumes of sub-alpine fir in their species mix. The impact on drying is significant. For example, drying times for green SPF (spruce, pine, sub-alpine fir) vary from 24 to 36 hours whereas drying times for sub-alpine fir can easily exceed 70 hours. In addition to longer drying times, the drying of species such as sub-alpine fir using current procedures often results in wet lumber and value loss can be higher than $100 per Mfbm. The potential annual impact for a typical BC mill is estimated to be in the range $1,000,000 to $1,500,000. Along the years, sawmills have invested millions of dollars in drying technology (conventional drying and green sorting systems) which, for the most part are efficient and relatively low cost. Thus, under the circumstances outlined above, sawmills urgently need to find ways to minimize the problems associated with the drying of sub-alpine fir that is, new procedures or combination of methods, to ensure maximum grade recovery at the end of drying and reduce drying times (increase productivity and lower processing costs). In addition, the pressure exerted by typical longer drying times for sub-alpine fir will impact the drying of spruce and pine. Thus, strategies to speed the drying for those two species are needed to maintain annual production targets. The main objective of this project is to evaluate several strategies using existing technology so that sawmills can readily implement them throughout their drying operations dealing with larger volumes of sub-alpine fir and for mills with kiln capacity constraints which could compromise their production targets.
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