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Computer simulation model of hot-pressing process of LVL and plywood products

https://library.fpinnovations.ca/en/permalink/fpipub5575
Author
Wang, Brad J.
Yu, C.
Date
April 2003
Edition
37655
Material Type
Research report
Field
Wood Manufacturing & Digitalization
into the veneer ply due to the existence of open lathe checks and roughness. Therefore, LVL/plywood panels can
Author
Wang, Brad J.
Yu, C.
Date
April 2003
Edition
37655
Material Type
Research report
Physical Description
23 p.
Sector
Wood Products
Field
Wood Manufacturing & Digitalization
Research Area
Advanced Wood Manufacturing
Subject
Veneer
Simulation
Plywood
Panels
Materials
Laminate product
Hot press
Gluing
Series Number
2019
W-1965
Location
Vancouver, British Columbia
Language
English
Abstract
Laminated Veneer Lumber (LVL) and plywood are the two major veneer-based wood composite products. During LVL/plywood manufacturing, the hot pressing process is crucial not only to the quality and productivity, but also to the performance of panel products. Up to now, the numerical simulation of the hot-pressing process of LVL/plywood products is not available. To help understand the hot-pressing process of veneer-based wood composites, the main objective of this study was to develop a computer simulation model to predict heat and mass transfer and panel densification of veneer-based composites during hot-pressing. On the basis of defining wood-glue mix layers through the panel thickness, a prototype finite-element based LVL/plywood hot-pressing model, VPress®, was developed to simulate, for the first time, the changes of temperature, moisture and vertical density profile (VDP) of each veneer ply and glueline throughout the pressing cycle. This model is capable of showing several important characteristics of the hot-pressing process of veneer-based composites such as effect of glue spread level, veneer moisture, density, platen pressure and temperature as well as pressing cycles on heat and mass transfer and panel compression. Experiments were conducted using several different variables to validate the model. The predicted temperature profiles of the veneer plies and gluelines (especially at the innermost glueline) by the model agree well with the experimental measurements. Hence, the model can be used to evaluate the sensitivity of the main variables that affect hot-pressing time (productivity), panel compression (material recovery) and vertical density profile (panel stiffness). Once customized in industry, the new model will allow operators to optimize the production balance between productivity, panel densification and panel quality or stiffness. This hot-pressing model is the first step in facilitating the optimization of the pressing process and enhanced product quality.
Veneers
Panels - Production - Computer simulation
Density - Computer simulation
Composite materials - Density
Plywood - Density
Lumber, Laminated veneer
Gluing - Processes - Hot press
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Dual purpose fire retardant adhesive with improved temperature stable bonds

https://library.fpinnovations.ca/en/permalink/fpipub38747
Contributor
Department of Supply and Services
Forintek Canada Corp.
Date
1979
Material Type
Research report
Field
Sustainable Construction
to manufacture plywood panels for use m interior applications. In this application, the adhesive, besides
Contributor
Department of Supply and Services
Forintek Canada Corp.
Date
1979
Material Type
Research report
Physical Description
14 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Panels
Adhesives
Location
Ottawa, Ontario
Language
English
Abstract
Panel Products
Adhesive
Fire Retardant - Adhesive
Documents
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Stiffness of shearwalls and diaphragms

https://library.fpinnovations.ca/en/permalink/fpipub37660
Author
Ni, Chun
Date
March 2003
Material Type
Research report
Field
Sustainable Construction
-based panels 5. shearwalls without hold-downs 6. shearwalls with openings January 2003 ΓΌ January
Author
Ni, Chun
Contributor
Canada. Canadian Forest Service.
Date
March 2003
Material Type
Research report
Physical Description
3 p.
Sector
Wood Products
Field
Sustainable Construction
Research Area
Building Systems
Subject
Wall strength
Walls
Mechanical properties
Shear
Panels
Design
Building construction
Analysis
Series Number
CFS Simple Progress Report No. 38;3544
W-1970
Location
Vancouver, British Columbia
Language
English
Abstract
In order to maintain the competitive advantage in existing and new markets situated in seismic and high wind zones such as the Pacific Rim and the southeastern U.S., it is proposed to study deflections in walls, floor and roof assemblies. The proposed project will also be very useful in: a) setting deflection criteria as will be demanded by performance-based codes, and b) responding to the inevitable transition to displacement-based seismic design.
Building construction - Design
Diaphragm analysis
Panels
Walls - Strength - Shear
Documents
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