Special terms for plywood

Special terms for plywood

2023-01-02
Special terms for plywood
1 Peeling debarking
The process of peeling off the bark of wood segments. According to the peeling method, it can be divided into mechanical peeling, hydraulic peeling and manual peeling.
2 Block conditioning
The process of softening wood segments with hot water or steam at a certain temperature.
3 Block centering centering
The process of determining the turning center line of the log section before peeling.

4 Rotary cutting rotary cutting
peeling. rotary cutting
The process of cutting the wood segment into continuous veneer strips by making a fixed axis rotation of the wood segment, with the rotary knife edge parallel to the center line of the clamping shaft or the rotation center of the wood segment, and making a linear feeding movement from the periphery of the wood segment to the center of the wood segment.
5 Half rotary cut, half round cut
The supporting beam for fixing the semicircle wood section or batten is installed between the clamps of the rotary cutting machine to make the wood section or batten eccentric. The rotary cutting method is to cut a veneer every time the clamp shaft rotates.
6 Rotary knife
peeling knifelathe knife
The tool used for the rotary cutting of wood segments.
7 knife back side
The surface of the rotary knife opposite to the wood segment during rotary cutting.
8 knife face side
The surface of the rotary knife opposite to the veneer during rotary cutting.
9 Grinding angle
The included angle between the front and back of the rotary knife is also called wedge angle.
10 micro wedge angle
Grind an additional small bevel in front of or behind the rotary knife or on these two surfaces with an oilstone. At this time, the included angle between the outermost two surfaces of the knife edge is the micro wedge angle.
11 Clearance angle
The angle between the back of the rotary knife and the section of the wood section surface passing through the cutting edge.
12 Cutting angle
The included angle between the front of the rotary knife and the section of the wood surface passing through the cutting edge, that is, the sum of the grinding angle and the back angle of the rotary knife.
13 Knife height

The vertical distance from the rotary knife edge to the horizontal plane passing through the center of the clamping shaft. This value is positive when the blade is above the horizontal plane of the clamp shaft center; Otherwise, it is negative.
14 trim knives
An opposite knife installed on the knife rest of the rotary cutting machine to determine the width of the veneer. The distance between two vertical knives is the veneer width.
15 pressure bar
A device that exerts pressure on the wood at the edge of the blade to prevent the rabbit wood from splitting in advance and reduce the cracks on the back of the veneer when peeling or cutting the veneer. There are two types of commonly used pressure gauges: nose bar and roller bar.
16 Distance between knife tip and pressure bar
The distance between the rotary knife edge and the pressing edge of the pressure gauge.
17 Vertical gap of pressure gauge
The vertical distance between the pressing edge of the pressure gauge and the horizontal plane passing through the rotary blade, that is, the vertical component of the blade.
18 Contact drying
It is a drying method that uses a heated flat plate or stick cylinder to contact the veneer under a certain pressure, so as to transfer heat to the veneer so that its excess water can evaporate. This method can improve the flatness of the dried veneer to some extent while drying, and is often used for thick veneer that is prone to drying deformation.
19 veneer surface inactivation
The veneer is excessively dry or stored for a long time, resulting in its surface wetting, gluing, paint and other performance degradation or process delay.
20 Veneer sorting veneer grading
The process of dividing the veneer into several grades according to the standard.
21 Appearance defects
Material defects and processing defects visible on the surface of finished veneer or plywood.
22 Veneer repair
The process of repairing a board that does not meet the standard requirements to make it meet the standard requirements.
23 Patching
The processing process of removing the defective parts (wormholes, holes, knots, etc.) on the veneer that do not meet the standards with tools, and then adding a veneer with the same tree species, texture, color, thickness, etc. as the veneer around the removed part and without appearance defects.
24 patch, plug
A shaped veneer used for veneer patching. The shape of the patch is usually round, oval or diamond.
25 Patch
A thin, long strip of veneer used for veneer repair.
26 Filling
A process of filling cracks, holes and other defects on veneer and plywood with putty.
27 Veneer edge joining
The process of splicing two or more veneers together in width. Including horizontal glue splicing and vertical glue splicing.
28Cross grain joining
The veneer feeding direction is perpendicular to the veneer texture direction during glue splicing.
29 parallel grain joining
The veneer feeding direction is parallel to the veneer texture direction during glue splicing.
30 Tape jointing
The method of splicing the veneer with adhesive tape.
31 Tapeless jointing
The adhesive tape is not used for veneer gluing, but the side faces of two veneers are glued together by adhesive.
32 Glue thread joining
The method of splicing the veneer with glue wire (hot melt glue line).
33 veneer end joining
The process of splicing two or more veneers together in the length direction. Including butt joint, miter joint, finger joint, lap joint, etc.
34 board docking
It is a lengthening method that the ends of two boards are closely contacted with each other along the texture direction.
35 veneer scarf joining
Milling or grinding is used to process the end of the veneer into an inclined plane so that the inclined plane of the end of two veneer can be glued and extended.
36 Veneer oblique grinding (cutting)
The process of milling or grinding the two ends of a veneer along the grain (length) direction into an inclined plane.
37 Single board finger joining
The end of two veneers is processed by tenon and glued for extension.
38 Veneer lap joining
Overlap and glue the ends of two veneers for extension.
39 Narrow veneer composing into full shell
The process of splicing narrow and long veneers into a whole veneer according to the size specification of plywood.
40 Dry veneer storage
The process of storing veneer in the intermediate veneer warehouse for a period of time after drying. The purpose of veneer storage is to balance the moisture content of veneer and meet the needs of reasonable scheduling and production arrangement of various veneer.
41 Veneer glue coating
The process of applying a specified amount of adhesive to the veneer surface. The commonly used sizing methods include coating, spraying, spraying and extruding.
42 Veneer roller coating
It is a kind of glue application method that liquid adhesive is transferred and coated on the veneer surface with a stick.

43 Veneer curtaining coating
A method of applying glue solution to veneer surface in the form of glue curtain.
44 veneer glue spraying
A method of spraying liquid adhesive onto veneer surface after atomization.
45 Veneer glue extruding
The method of applying high viscosity or foam glue solution to the veneer surface through the holes of the extruder.
46 Glue spread amount
The mass of adhesive applied on unit area of veneer is usually expressed in g/m2. Single side metering or double side metering is available.
47 Open aging/open assembly
The veneer shall be stored for a period of time after gluing, and then be reassembled.
48 closed assembly
The veneer shall be assembled immediately after gluing, and then placed for a period of time before pressure gluing.
49 sets of blanks lay up
The process of combining glued and non glued veneer according to the structural requirements of plywood.
50 Cross lay up
It refers to the method of forming billets in which the texture directions of adjacent layers are perpendicular to each other.
51 Plywood repairing
After hot pressing, repair the cracks and other defects on the surface of plywood or corner cracks to improve its grade.
52 Glue penetration
When hot pressing, the adhesive penetrates into the plywood surface through the surface plate, causing the defect of board surface pollution.
53 core gap
Separation occurs between the same layer of inner core board or two adjacent splicing core boards in plywood.
54 core overlay
The phenomenon that two adjacent core veneers (or two parts of a cracked veneer) overlap each other in the same layer of plywood.
55 burr and groove
The veneer surface is rough due to fiber tearing or small uneven cutting edge during the peeling process.
56 Sanding through
When sanding the plywood, the local sanding of the surface board will expose the processing defects of the glue layer or the next veneer.
57scraping
A surface processing method that uses scraping method to remove adhesive tape on the surface of plywood and make its surface smooth and clean.
58 Wood failure percentage
When testing the bonding strength, the percentage of the area of the wood fiber glued or torn off on the shear failure surface of the test piece in the shear area of the test piece is estimated by visual inspection.
59 knife testing
It is a method to cut the knife into the bonding surface of the adjacent veneer, and then pry off the upper veneer to evaluate the bonding quality with the wood breaking rate on the damaged surface