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Improve product quality through humidity control

https://library.fpinnovations.ca/en/permalink/fpipub38921
Contributor
Forintek Canada Corp.
Date
December 2004
Material Type
Pamphlet
Field
Sustainable Construction
that it continually tries to achieve an equilibrium moisture content (EMC) within its environment. As such, when
Contributor
Forintek Canada Corp.
Date
December 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Moisture content
Series Number
Technology Profile ; TP-04-02W
E-4018
Language
English
Abstract
Just as human beings and plants need moisture to stay healthy, the same principle applies to organic materials such as paper, wood and textiles. With an ever-growing demand for increased productivity and the expectation of uniform product quality within the secondary wood manufacturing sector, natural materials such as wood require a climate in which processes and storage occur at a certain air humidity. As indoor climate and humidity constantly change with heating, ventilation and exhaust systems, humidification systems can help ensure uniform quality throughout production.
Moisture content
Quality control
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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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Des produits de qualité supérieure grâce au contrôle de l'humidité

https://library.fpinnovations.ca/en/permalink/fpipub38912
Contributor
Forintek Canada Corp.
Date
December 2004
Material Type
Pamphlet
Field
Sustainable Construction
Contributor
Forintek Canada Corp.
Date
December 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Moisture content
Series Number
E-4009
Language
French
Abstract
L’humidité relative de l’environnement influe non seulement sur la santé des êtres humains et des plantes, mais aussi sur la performance de matériaux organiques comme le papier, le bois et les textiles. Face à la pression constante en vue d’accroître la productivité et aux attentes sur le plan de la qualité uniforme des produits, l’industrie de la transformation secondaire des produits du bois doit prendre les mesures nécessaires pour assurer un certain taux d'humidité dans ses installations de transformation et d’entreposage du bois. Étant donné que les systèmes de chauffage, de ventilation et d’échappement entraînent une variation constante du climat intérieur, les systèmes d’humidification peuvent favoriser l’uniformité de la qualité à toutes les étapes des procédés de fabrication.
Moisture content
Quality control
Documents
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