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Using urea to reduce formaldehyde, acrolein and VOC emissions from OSB pressing.

https://library.fpinnovations.ca/en/permalink/fpipub5620
Author
Feng, Martin
Date
January 2008
Edition
37870
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Author
Feng, Martin
Date
January 2008
Edition
37870
Material Type
Pamphlet
Physical Description
7 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Pollution
Materials
Air pollution
Air
Series Number
W-2497
Language
English
Abstract
This research work involved the production of aspen OSB panels in a pilot plant using three types of commercial adhesive systems respectively as a wood binder (PF, PF/MDI and MDI). It was demonstrated that spraying urea aqueous solution to dry wood strands at 0.2% and 0.5% urea loading rates (urea solids on a dry wood weight basis) can effectively reduce the emissions of formaldehyde, acrolein and some other volatile organic compounds from OSB pressing without adversely affecting the board properties regardless which type of adhesive is used. The side-effect of the urea addition was the dramatic increase of press emission of nitrogen compounds, most likely due to the slow decomposition of urea to ammonia at high press temperatures. This approach may also be effectively and economically applied to lowering formaldehyde, acrolein and VOC emissions from OSB dryer and the side-effect of increased nitrogen compounds emission could be less due to lower wood temperatures inside the OSB dryer than those inside the OSB press. It was also demonstrated that using MDI adhesive to partially or completely replace PF adhesive can lower formaldehyde, phenol and total VOC emissions from OSB pressing. Under the test conditions of this work and without urea addition, the MDI-bonded aspen OSB panels emitted about 87% less formaldehyde, 80% less phenol and 25% less water-soluble VOC than the PF-bonded aspen OSB panels. The PF/MDI-bonded aspen OSB panels emitted about 61% less formaldehyde, 41% less phenol and 11% less water-soluble VOC than the same PF-bonded panels. However, the MDI-bonded panels produced 65% higher water-insoluble VOC than that of the PF-bonded panels although the water-insoluble VOC accounted for less than 3% of the total VOC emitted from the MDI-bonded panels.
Composite materials - Manufacture
Formaldehyde
Air pollution
Air pollution - Sources
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Le séchage sous vide

https://library.fpinnovations.ca/en/permalink/fpipub38988
Author
Lavoie, Vincent
Date
November 2006
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Author
Lavoie, Vincent
Date
November 2006
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Drying
Seasoning
Series Number
E-4169
Location
Québec, Québec
Language
French
Abstract
Seasoning - Vacuum drying
Drying
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Author
Lavoie, Vincent
Date
November 2006
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Author
Lavoie, Vincent
Date
November 2006
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Drying
Seasoning
Series Number
Technology Profile ; TP-06-01E
E-4170
Location
Québec, Québec
Language
English
Abstract
Seasoning - Vacuum drying
Drying
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Lumber drying : choosing the system that best suits your needs

https://library.fpinnovations.ca/en/permalink/fpipub42345
Author
Garrahan, Peter A.
Date
April 2004
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Author
Garrahan, Peter A.
Date
April 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Seasoning
Series Number
Technology Profile ; TP-04-03E
E-4001
Location
Sainte-Foy, Québec
Language
English
Abstract
Whether you are drying 2 x 4 studs or high-quality hard maple for furniture stock, the range of available kiln systems has grown considerably over the past few years. Anyone considering the addition of new drying equipment would be well advised to consider all the options before making a final decision. Some drying systems offer the ability to dry products that were previously impossible to dry properly, or to achieve unprecedented product quality levels. Without considering all options up front, you could end up selecting a system that limits your ability to respond to current or future market opportunities.
Seasoning - Kiln drying
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Le triage préliminaire permet d'améliorer le séchage

https://library.fpinnovations.ca/en/permalink/fpipub38914
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Lumber
Seasoning
Series Number
E-4011
Language
French
Abstract
Le prétriage du bois vert offre aux producteurs de bois canadiens la possibilité d’accroître leur productivité tout en améliorant la qualité du produit. Cette pratique a aussi été adoptée en réponse aux demandes des clients qui exigeaient un produit plus uniforme. Les entreprises de transformation secondaire sont souvent prêtes à payer plus cher pour que les producteurs leur livrent du bois qui répond toujours à leurs exigences précises quant à la teneur en humidité (TH). Le présent document décrit les caractéristiques du bois vert qui ont le plus d’influence sur l’uniformité du séchage pour les groupes d’essences ÉPS et pruche-sapin. On y trouve aussi de l’information sur les techniques qu’utilisent actuellement les scieries canadiennes pour prétrier le bois vert afin d’améliorer le taux de récupération, de réduire la consommation d’énergie, de diminuer les temps de séchage, d’accroître l’uniformité de la teneur en humidité finale et de réduire au minimum le retrait excessif. Le défi pour les producteurs de bois consiste à trouver une technique de prétriage qui puisse être adaptée à leurs conditions particulières et offrir un intéressant rendement du capital investi.
Seasoning - Kiln drying - Quality control
Lumber - Sorting
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Séchage du peuplier et du bouleau : les essences feuillues nordiques ont des exigences particulières

https://library.fpinnovations.ca/en/permalink/fpipub38917
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Hardwoods
Seasoning
Series Number
E-4014
Language
French
Abstract
Les essences feuillues de l’Ouest du Canada ne sont pas difficiles à sécher. Toutefois, toutes les essences courantes possèdent certaines caractéristiques qui peuvent causer des problèmes pendant le séchage si elles ne sont pas bien contrôlées. En effet, certains producteurs ont déjà connu d’importantes difficultés parce qu’ils n’avaient pas tenu compte des caractéristiques propres aux essences feuillues et avaient utilisé des programmes de séchage applicables aux résineux. Règle générale, les méthodes de séchage adaptées aux essences résineuses ne conviennent pas aux produits à base de bois de feuillus.
Hardwoods - Seasoning
Seasoning - Kiln drying - Quality control
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Presorting to improve drying : an overview

https://library.fpinnovations.ca/en/permalink/fpipub38926
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Contributor
Forintek Canada Corp.
Date
March 2004
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Lumber
Seasoning
Series Number
Technology Profile ; TP-03-03W
E-4023
Language
English
Abstract
Pre-sorting green lumber offers Canadian lumber producers the potential to increase both productivity and product quality. Another reason why many have adopted this practice is in response to demands from customers for greater product uniformity. Secondary manufacturers will often pay a premium to producers who can consistently deliver lumber dried to their specific moisture content (MC) requirements. This Profile provides some background on the green lumber characteristics that have the greatest impact on drying uniformity within the SPF and Hem-fir lumber groupings. It also presents information on current technology being used in Canadian sawmills to pre-sort green lumber to improve recovery grade, reduce energy consumption, reduce drying times, improve final moisture content uniformity, and minimize excessive shrinkage. The challenge for lumber producers is to find a pre-sorting technology that can be implemented in their specific sawmill environment, and that will deliver a tangible return on investment.
Seasoning - Kiln drying - Quality control
Lumber - Sorting
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Influence of moisture content and temperature on the performance of fingerjointed lumber

https://library.fpinnovations.ca/en/permalink/fpipub42354
Author
Mohammad, M.
Date
July 2003
Material Type
Pamphlet
Field
Wood Manufacturing & Digitalization
Author
Mohammad, M.
Date
July 2003
Material Type
Pamphlet
Physical Description
4 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Moisture content
Series Number
Technology Profile ; TP-03-02E
E-4028
Location
Sainte-Foy, Québec
Language
English
Abstract
The process of fingerjointing is complex and requires numerous efforts in order to evaluate the various workable and optimum conditions of jointed wood members. Many factors are known to affect the strength of fingerjoints. Some are related to wood, such as species, density, natural defects, moisture content (MC), temperature, and gluability of the species. Others are related to wood machining, including type of adhesive and gluing processes, such as condition of the cutting tools, curing time and applied assembling pressure.
Moisture content
Temperature - Influence on mechanical properties
Glued joints - Finger
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8 records – page 1 of 1.