Categories of
defects
|
Inspection Item
|
Face
|
Back
|
Grade Of Plywood
|
AA Grade
|
A Grade
|
B Grade
|
C Grade
|
(1) Pin knots
|
¡¡
|
allowed
|
(2)intergrown knots,partially
intergrown knots,dead knots
|
the entries on one side per square
meter
|
Not allowed
|
5
|
8
|
10
|
Not restricted
|
¡¡
|
Intergrown knots
|
Max. single diameter (mm)
|
Not allowed
|
(not counted up to 10)
|
Not restricted
|
partially inter grown knots,dead knots
|
Max. single diameter (mm)
|
Not allowed
|
5
|
15
(not counted up to 5)
|
30
(not counted up to 10)
|
Not restricted
|
(3)Abnormalstructure
|
¡¡
|
allow
|
(4)inbark¡¢resin pocket
|
the entries on one side per square
meter
|
Not allowed
|
3 4
(not counted up to 10)
|
10
(not counted up to 15)
|
Not restricted
|
¡¡
|
inbark
|
Max. single length (mm)
|
Not allowed
|
15
|
60
|
Not restricted
|
resin pocket
|
Max. single length (mm)
|
Not allowed
|
15
|
30
|
Not restricted
|
(5)split
|
maximal single
width (mm)
|
Not allowed
|
1
|
1.5
|
3
|
6
|
maximal single
length (mm)
|
200
|
400
|
800
|
Not restricted
|
(6)Worm holes, dog holes, holes
|
maximal single
diameter (mm)
|
Not allowed
|
2
|
5
|
8
|
15
|
the entries on one
side per square meter
|
4
|
5
(not counted up to
2mm
)
|
10
(not counted up to
5mm
)
|
If not Sifter Shape
Appearance then not Restricted
|
(7)Discoloration
|
Not exceed the area of side(%)
|
Not allowed
|
tint 10
|
30
|
Not restricted
|
(8)Rot
|
|
Not allowed
|
Symbols of incipient decay are
allowed if not affect strength ,yet the area not exceed 1% of the side area
|
incipient decay is allowed but the
veneer of this part will not flake off, also can't be twisted into powder
|
(9)Resin streak
|
Max single length(mm)
|
Not allowed
|
150
|
Not restricted
|
Max. single length account for the
length of the panel (%)
|
10
|
the entries on one side per square
meter
|
4
|
(10) outer ply open joint
|
Max. single
width(mm)
|
Not allowed
|
0.5
|
1
|
2
|
Max. single length
account for the length of the panel (%)
|
10
|
30
|
50
|
Bar /metre in width
|
1
|
2
|
Not restricted
|
(11)outer ply overlap
|
Max single
width(mm)
|
Not allowed
|
8
|
Not restricted
|
Max. single length
account for the length of the panel (%)
|
20
|
(12)core gap
|
The core gap
appressed to outerply
|
Max single
width(mm)
|
Not allowed
|
2
|
4
|
8
|
10
|
Bar /metre in width
|
2
|
3
(not counted up to
2mm
)
|
Not restricted
|
The max gap width
of other ply(mm)
|
10
|
(13)centers gap
|
Max single width
(mm)
|
Not allowed
|
10
|
(14)blister,
delamination
|
¡¡
|
Not restricted
|
(15)hollow,
imprint,
bump
|
Max. single area(mm2)
|
Not allowed
|
50
|
400
|
3000
|
Not restricted
|
the entries on one
side per square meter
|
2
|
4
|
Not restricted
|
(16)torn grain
|
Not exceed side
area(%)
|
Not allowed
|
5
|
20
|
60
|
Not restricted
|
The depth not
exceed(mm)
|
0.5
|
Not penetrate
through, allowed
|
(17)outer ply
sanding
through
|
Area on side per mm2
|
Unallowed
|
1000
|
Not restricted
|
(18) glue
penetration
& any
other manmade
stain
|
Not exceed side
area(%)
|
Not allowed
|
1
|
10
|
Not restricted
|
(19)patch¡¢shim
|
Allowed(If made in
proper way and fill up durably),the entries on side per m2
|
Not allowed
|
6
|
Not restricted
|
add up to not
exceed side area(%)
|
1
|
5
|
Not restricted
|
Gap not exceed(mm)
|
0.5
|
1
|
2
|
(20)aluminous inclusions
|
¡¡
|
Not allowed
|
allow
|
(21) defects at the edges of the
panel
|
Not exceed (mm) (within the nominal
breadth)
|
Not allowed
|
5
|
10
|
(22) other defects
|
¡¡
|
Not allowed
|
Regarded as the
most similar defects
|
|
|
|
|
|
|
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