Professional terms are commonly used in hardwood and softwood plywood manufacture and quality inspection.
debarking
The process of stripping the bark of wood logs. The peeling method could be mechanical peeling, hydraulic peeling and manual peeling.
peeling, rotary cutting
The log is rotated on a fixed axis, the blade of the rotary knife is parallel to the center line of the axis.
peeling knife, lathe knife
A tool used for rotary cutting of wood logs.
tight side
The surface of the veneer that is in contact with the pressure gauge during peeling or slicing, also known as the front of the veneer. Usually the front of the veneer is smoother.
loose side
The surface of the veneer that is in contact with the tool during rotary cutting or planing, also known as the back of the veneer. There are often cracks on the back of the veneer, which is relatively rough.
veneer clipping
The process of cutting veneer strips or raw veneers into veneers of a certain width according to the requirements of the appearance quality and size of veneers.
veneer drying
The process of removing excess water in the veneer with the help of various media to make it meet the final water content requirements. Common drying methods are convection drying and contact drying.
patching
Use tools to dig out the defective parts (worm eyes, holes, knots, etc.) of the veneer, and then add a piece of the same veneer around the excavated part without appearance defects.
patch, plug
A veneer sheet of a certain shape used for digging and repairing veneers. The shape of the patch is usually round, oval or diamond.
shim
Thin and long veneer strips for veneer repairs.
filling
A process of filling veneer cracks and holes with putty.
cross grain jointing
The feeding direction of the veneer is perpendicular to the grain direction of the veneer when glue is assembled.
parallel grain jointing
The feeding direction of the veneer is parallel to the grain direction of the veneer when glue is assembled.
veneer butt jointing
The lengthening method in which the ends of two veneers are in close contact with each other along the grain direction.
veneer scarf jointing
The end of the veneer is processed into a bevel by milling or grinding, and the bevel of the end of the two veneers is glued and joined to lengthen.
veneer finger jointing
A method of lengthening the ends of two veneers through finger tenon processing and gluing.
veneer lap jointing
A method of overlapping and gluing the ends of two veneers to lengthen.
open assembly
After the veneer is glued, it is placed for a period of time before being assembled (lay-up).
closed assembly
The veneer is assembled immediately after gluing, and then placed for a period of time before cold press and hot press.
glue penetration
The glue penetrates into the surface of the plywood through the surface veneer during hot pressing.
core gap
The phenomenon of separation between the same inner core board or two adjacent spliced core boards in plywood.
overlap
The phenomenon in which two adjacent core veneers (or two parts of a cracked veneer) in the same layer of plywood overlap each other.
sanding through
When the plywood is sanded, the surface veneer is sanded through to expose the inside of plywood.
wood failure percentage
This is a bonding strength test. It means the percentage of the torn-off part of the plywood sample which is evaluated by visual inspection.
Source: Chinese Plywood Standard GB/T 18259—2018
