Description
1525x1525mm Birch Plywood for Furniture
The grade of the plywood is based on the defects such as joints (live joints, dead joints, leaky joints), decay (heartwood decay, sapwood decay), worm eyes (large worm eyes, small worm eyes, epidermal worm groove), cracks (through cracks, non-through cracks), bending (transverse bending, horizontal bending, warping bending, one-side bending, multi-sided bending), twisting marks, trauma, blunt edges and other defects as indicators.
It is assessed according to the presence, size and number of these defects.
Of course, due to the different types of materials (direct use of logs, sawn logs, sawn timber, etc.), sources (domestic, imported), standards (national standards, enterprise standards), there are different provisions, such as fen, one, two, three, there are points I, II, III, etc. (level), there are also points A, B, C, etc. (level), and so on.
For further information, please refer to the relevant wood standards or materials.
Such as 《GB-T 155-2006 log defects》, 《GB-T 144-2003 log inspection》, 《GB-T 143-2006 sawing logs》, 《NHLA grading Rules for U.S. hardwood panels》, 《Canadian Sawn Timber Standard Grading Rules -2008》, 《Russian Log Standards and Inspection》, and so on.
Foresmate’s birch plywood sheet is divided into B, BB, CP, and C grades.
1525x1525mm Birch Plywood for Furniture evaluation is as follows:
B grade
Natural veneer grade characteristics:
Light-colored slipknot with a maximum diameter of 10 mm is allowed;
Maximum 8 slipknot per square meter, diameter not greater than 25 mm;
For cracked or partially shed joints, if their diameter is less than 5 mm, then the number is not limited;
For cracked or partially detached joints, if the diameter is more than 5 mm, then a maximum of 3 per square meter is allowed.
Per square Meters are allowed to fall off up to 3 nodes, brown spots are not allowed;
Cracks and core materials are not allowed.
Production grade characteristics:
Do not allow dredging, do not allow double dredging, do not allow putty dredging, do not allow production pollution, do not allow splicing.
<< Click Here To Contact Factory >>
BB Grade
Natural veneer grade characteristics:
Dark or light colored slipknot with a maximum diameter of 10 mm: No more than 20 knots with a diameter of less than 25 mm are allowed.
Five of them may be allowed to be up to 40 mm in diameter;
There is no limit to the number of open or semi-open knots less than 15 mm in diameter:
Three open or half-open knots per square meter are allowed:
Natural brown difference less than 50% board surface:
Cracks of less than 2 mm in width and less than 250 mm in length are allowed 5 cracks per 1.5 m:
The core material does not exceed 50% of the board surface.
Production grade characteristics:
Do not allow double repair, do not allow putty repair, do not allow production stains, do not allow splicing.
The limit on the number of scrabbles is equivalent to the number of fawns mentioned above.
Grade CP
Natural veneer grade characteristics:
Slipknot allowed:
Crack width not greater than 1.5 mm:
Open or semi-open knots allowed: The number of open knots less than 6 mm in diameter is not limited;
Natural brown color difference spots allow:
There is no limit to the number of cracks with a width not greater than 2 mm and a length not greater than 600 mm;
Core material allowed.
Production grade characteristics:
Do not allow putty repair, do not allow production stains, do not allow splicing.
All knots larger than 6 mm in diameter must be mended, allowing double mending.
C Grade
Natural veneer grade characteristics:
Dark light-colored slipknot allowed;
Open or partially open knots are permitted;
Up to 10 open knots per square meter with a diameter of less than 40 mm;
When making a triad plywood, the holes after the symmetry of the dead knot fall off shall not be used for the outer layer;
Natural brown color difference spot blocks allow:
Width less than 10 mm, length less than 400 mm crack allowed;
Core material allowed.
Production grade characteristics:
Splicing is not allowed, face goosebumps can be used without closure, and production stain is allowed.
If you are interested in Foresmate products, please feel free to contact us.
