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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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Moisture evaluation and veneer peeling of douglas fir and spruce logs from different mills and log yard age inventories

https://library.fpinnovations.ca/en/permalink/fpipub49466
Author
Semple, Katherine
Dai, Chunping
Date
August 2017
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Semple, Katherine
Dai, Chunping
Date
August 2017
Material Type
Research report
Physical Description
69 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Moisture content
Veneer
Fir
Spruce
Storing
Language
English
Abstract
A total of 48 peeler blocks and 256 mini-billets were sampled from mills to investigate the effects of yard storage time, and artificial yard drying and sprinkling on residual moisture contents (MCs) and veneer quality. MC in fresh and stored log inventories varied greatly across mills according to geographic location of their wood supply zones, bark damage and loss, and storage time and conditions. The main findings were as follows: 1. DF logs supplied by three BC mills from the Cariboo, Thompson Okanagan, or Kootenay regions were highly variable in wood MC. 2. Winter-cut DF logs with high sapwood MC stored had good bark retention and high moisture retention over 6 and 9 winter-spring months. No effects on veneer peeling roughness from longer-term winter storage up to 9 months. 3. Summer-cut logs had little or no residual bark, or the bark slipped off very easily during debarking. Exposed, bark-free summer-cut logs can dry and crack on edges and ends very quickly, within a few weeks. 4. A marked decline in veneer quality with piling time in Summer for spruce and DF, suggesting an optimum window of processing of such exposed logs of about two weeks. Veneer quality and recovery suffered markedly once the logs had fully air dried mainly because of edge splits creating natural fragmentation of the ribbon. 5. Mills receiving dry-zone logs with much lower MC have a very limited storage window, especially over winter. As little as 2-3 weeks if bark is damaged or missing. 6. Veneer quality could not be definitively tied to log residual MC. Under the controlled laboratory conditions used here it was observed that peeling quality could still be good at low sapwood MC (35-40%) and or very high (MC>100%). Whether this is still the case in mill production is unknown. 7. Logs must never be allowed to fall below FSP and develop edge-checks or deep end checks. 8. Wax emulsion end sealants were effective at hampering drying and end checking on high MC logs, but not effective on low MC logs. 9. Sprinkling retained log freshness and peel quality in high MC DF for several months and prevented log drying and end splitting as well as inner log staining. Ends absorbed considerable extra moisture. Some variability in peel quality was noted. 10. The prototype EM1000 Ground Penetrating Radar could only be reliably used in log edge mode in DF. The unit would also require re-calibration for the very high sapwood MC in spruce and wet-zone DF logs.
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