Plywood & LVL
Plywood, LVL and other veneer based panels are produced from layers of veneer sheet. Veneers are produced by slicing or peeling off by rotary lathe from lumbers. Plywood is a flat wood panel built up of sheets of veneer called plies, united under pressure by a bonding agent to create a panel with an adhesive bond between plies. It’s always constructed with an odd number of layers with the grain direction of adjacent layers oriented perpendicular to one another (USDA Forest Service on Wood Handbook. 1999).
Laminated Veneer Lumber is wood panel that composed of laminated veneer sheets and glued together with their grains nearly parallel and when cross grain veneer sheets are used, lumber for general use whose total thickness of cross grain veneer sheets is not more than 20 percent of the thickness of the product and composition ratio of the cross grain veneer sheets in number is not more than 30 percent (Japanese MAFF, Japan Agricultural Standard for LVL & SLVL, 2008).
Many types of veneer based panel are manufactured all over the world and many standard established to ensure panel qualitiy. Japanese government devided plywood to three types due to purpose of panel using, they are:
Type Special, a type of plywood that mainly for purposes of using outdoors or using in the places where humid condition occurs at all times.
Type I, mainly for purposes of using in the places where humid condition intermittently occurs.
Type II, mainly for purposes of using in the places whrere humid condition occasionally occurs.
According to above definitions, bonding quality of plywood should be:
Type Special > Type I > Type II
Dovechem has various resin to fulfill the necessary of any types of panel that you produce.
Ask your Dover Chemical representative for the right adhesive to help you meet your performance goals in your next project.
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