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Mill trial of log storage age effects on veneer production and using LogdryTM to predict douglas fir log residual moisture contents

https://library.fpinnovations.ca/en/permalink/fpipub52647
Author
Semple, Katherine
Dai, Chunping
Date
August 2018
Material Type
Research report
Field
Sustainable Construction
Author
Semple, Katherine
Dai, Chunping
Date
August 2018
Material Type
Research report
Physical Description
27 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Logs
Storing
Aging
Veneer
Moisture content
Series Number
Industry Partnership
Language
English
Abstract
This study was conducted with the aim of assessing the effects of log storage time and conditions at a BC mill yard on veneer production under mill production conditions. The second objective was to validate the FPInnovations LogdryTM drying model for developed for wood piles in Eastern Canadian mills. The software was used to generate drying rate predictions under the BC mill’s prevailing weather conditions and storage times for comparison with some measured residual moisture contents of Douglas fir logs kept in storage at the mill for six and nine months, sampled and peeled in a laboratory trial in 2016. The 2016 lab trials suggested little effect of lengthy (winter) storage up to 9 months but mill experience suggests this is excessively long and logs deteriorate in terms of veneer production and quality considerably earlier. Unfortunately due to experimental circumstances the mill peeling trials for the 9 month stored logs were unable to provide an accurate assessment of the true effect on production. Mills trials indicated % heavy sap had remained fairly stable largely within the mill target of 14% to 17% over the storage periods. During the mill trials there were unavoidable heavy confounding effects of different average diameter for log groups and peeler knife condition affecting the expected veneer production variables. The trials also demonstrated how pile size and height play a major role in protecting logs from drying; with very dry logs having a deleterious effect on veneer production. Logs held in small piles for 12 months or more, even with artificial ‘drying retardants’ such as end sealant and tarping were too dry for reliable peeling, causing very rapid knife wear, spinouts, veneer break-up and line blockages and significant lost recovery. The % heavy sap offtakes from these trials were just 2% to 4%. LogDryTM provides a fairly good estimate of likely drying rate trends of mid-sized (35 cm/14” to 41 cm/16” range) Douglas fir under the BC mills historic weather conditions over 6 and 9 months. LogDryTM (Birch setting) was closest to measured log MC in large diameter (46 cm/18”) logs but the Aspen setting was closer to measured MC in small logs (<30 cm/12”). In the limited sample of logs available from the mill in 2016 the 12” logs were much drier after 9 months storage than the model predicted, even on the Aspen setting. Further sampling of piled logs in the small diameter range is needed to verify this observation. LogDryTM was used to estimate drying rates of logs stored before or after Summer. Modelling indicated a shorter viable storage window for logs delivered before Summer compared to just before Winter, especially in the 6-month range. Residual log MCs were very similar after 12 months regardless of start time. Further work is required to better calibrate LogdryTM for major Western Canadian species, particularly Douglas fir, Spruce and Lodgepole pine, and reduce the calculation time for simulations. Further adjustment may be needed for simulating real drying rates in very small logs. The model assumption of similar residual MC after 12 months regardless of start time also needs to be verified.
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Caractérisation de la dégradation des revêtements acryliques par vieillissement

https://library.fpinnovations.ca/en/permalink/fpipub3214
Author
Vlad, Mirela
Date
March 2014
Edition
39875
Material Type
Research report
Field
Sustainable Construction
Author
Vlad, Mirela
Contributor
Canadian Forest Service
Date
March 2014
Edition
39875
Material Type
Research report
Physical Description
34 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Advanced Wood Materials
Subject
Coating
Aging
Series Number
Technologies transformatives
Project no.301008001
E-4899
Location
Québec, Québec
Language
French
Abstract
COATINGS
AGING TESTS
Abstract
L’objectif principal de ce projet était de caractériser la dégradation des revêtements acryliques pour le bois. Les objectifs spécifiques ont été comme suit: 1. Étudier la photodégradation/durabilité de différents types de revêtements acryliques par différents types de vieillissement; 2. Déterminer l’impact de l’épaisseur du film acrylique sur l’amélioration de la protection du bois extérieur.
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Accelerated aging and outdoor weathering of aspen waferboard

https://library.fpinnovations.ca/en/permalink/fpipub4743
Author
Alexopoulos, J.
Date
March 1991
Edition
41549
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Alexopoulos, J.
Date
March 1991
Edition
41549
Material Type
Research report
Physical Description
39 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Alberta
Manitoba
Saskatchewan
Waferboards
Utilization
Aspen
Aging
Series Number
Forestry Canada No. 1
E-1235
Location
Ottawa, Ontario
Language
English
Abstract
Waferboard
Aspen - Utilization
Waferboard - Aging
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Effect of accelerated aging and outdoor weathering on various properties of waferboard : progress report

https://library.fpinnovations.ca/en/permalink/fpipub38389
Author
Alexopoulos, J.
Date
March 1990
Material Type
Research report
Field
Wood Manufacturing & Digitalization
Author
Alexopoulos, J.
Date
March 1990
Material Type
Research report
Physical Description
3 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Weathering
Waferboards
Outdoors
Aging
Series Number
CFS project no.1
3810D010
E-1176
Location
Ottawa, Ontario
Language
English
Abstract
Waferboard - Aging
Waferboard - Outdoor Weathering
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