Information

Terminology

Term Definition
Plywood Wood-based panel consisting of an assembly of layers glued together with the direction of the grain in adjacent layers usually at right angles.
Balanced plywood Plywood in which the layers are symmetrical about the central layer with respect to thickness, grain orientations and species.
Veneer plywood Plywood in which all the layers are made of veneers oriented parallel to the plane of the panel.
Core plywood Plywood having a core.
Blockboard Core plywood, the core of which is made of strips of solid wood more than 7 mm wide but not wider than 30 mm, which may or may not be glued together.
Laminboard Core plywood, the core of which is made of strips of rotary cut veneer, not thicker than 7 mm, placed on edge, all or most of which are glued together.
Composite plywood Plywood, the core (or certain layers) of which is made of materials other then solid wood or veneers. There are at least two crossbanded layers on each side of the core.
Moulded plywood Plywood which is not flat, made by pressing in a mould.
Long grain plywood Plywood in which the grain of the outermost plies is parallel or nearly parallel to the long edge of the panel.
Cross grained plywood Plywood in which the grain of the outermost plies is parallel or nearly parallel to the short edge of the panel.
Layer Either one ply or two or more plies glued together with their grain direction parallel or another material.
Cross band Inner layer with grain direction at right angles to the outermost plies.
Core Central layer visible on the edges of the manufactured panel, generally thicker than the other layers and consisting of: - blocks or strips of wood placed side by side which are or are not be glued together; - other wood-based material; - other sheet material; - cellular construction.
Veneer Thin sheet of wood not more than 7 mm in thickness.
Sliced veneer Veneer produced by slicing.
Rotary cut veneer Veneer produced by peeling.
Ply Either one single veneer or two or more veneers joined edge to edge or end to end.
Surface Visible part of outermost ply of a plywood.
Face The better quality surface of a plywood.
Back The opposite surface to the face.
Length of a panel The panel dimension in the direction of the grain of the outermost layers.
Width of a panel The panel dimension at right angle to the length.
Thickness of a panel Dimension perpendicular to the surface of the panel.
Grain General direction or arrangement of fibres.
Angle grain Grain forming an oblique angle with the edges of a ply.
Spiral grain Grain that follows a spiral course around the pith.
Interlocked grain A characteristic of a wood where the fibres in succeeding growth periods incline alternately in opposite directions.
Veining Network formed by veins of wood on the surface of veneer.
Curly grain Grain that follows thight irregular curves.
Knot Portion of a branch embedded in the wood.
Intergrown knot Knot which is intergrown for at least 3 of its perimeter with the surrounding veneer.
Partially intergrown knot Knot which is intergrown for 1 to 3 of its perimeter with the surrounding veneer.
Non adhering knot Knot which is intergrown for less then 1 of its perimeter with the surrounding veneer.
Knot hole Void produced by the removal of a knot.
Sound knot Knot showing no indication of rot.
Pin knot Sound intergrown knot of no more than 5 mm diameter.
Check Separation of the fibres which does not extend through the thickness of the veneer.
Splint Separation of the fibres which extend through the thickness of the veneer.
Stain Any variation from the natural colour of wood, which is not associated with a loss of strength.
Resin pocket Lens-shaped cavity in timber containing or that has contained resin.
Bark pocket Bark that is partly or wholly enclosed in the wood.
Roughness Unevenness of the surface due to irregularities of the structure of the wood or due to defective manufacturing.
Open joint Discontinuity between two adjacent elements in a ply.
Overlap (joint) Defect due to overlapping of two adjacent veneers (or two sections of a split veneer) in a ply.
Blister Localised separation caused by area of glue bond failure between plies.
Bump Local area of over-thickness showing in an outermost ply.
Hollow Local depression in an outermost ply.
Imprint Local indentation caused by foreign matter being pressed into a surface.
Inclusion Foreign matter embedded in a veneer.
Plywood sanded only on one side Plywood the face or back of which has been smoothed by means of a mechanical sander.
Plywood sanded on both sides Plywood the face and back of which has been smoothed by means of a mechanical sander.
Scraped plywood Plywood the face and/or back of which has been smoothed by means of a mechanical scraper.
Overlaid plywood Plywood surfaced with one or several overlay sheets or one or several films such as: - impregnated paper; - plastic; - resin film; - metal; - decorative veneer.
Textured plywood Plywood modified by mechanical method to create greater surface relief.
Veneered plywood Plywood which is overlaid by a decorative wood veneer.
Sanding through Local absence of the outer ply resulting from excessive sanding which reveals some of the glue line (and/or the underlying ply).
Glue penetration Glue which has seeped through the outer ply and which can show up as blemishes.
Inserting Repairing of a ply by an element of determinated shaped sound veneer, inserted to replace defective portions which have been previously removed.
Patch (or plug) Piece of determined shaped veneer for inserting.
Shim Piece of long and narrow shaped veneer for inserting.
Filling Repairing by sealing of open defects with filler.
Bond Adhesion by means of glue.
Lay-up Arrangement of layers in a plywood.
Composition Description of constituent elements of plywood.
Cup Curvature of a panel across the width.
Bow Curvature of a panel across the length.
Twist Spiral distorsion of a panel
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