Professional training would be good for most of the Plywood QC/QA Parts 142: WHITE BIRCH MANUFACTURING DEFECTS ,QC INSPECT AND GRADE THEM CAREFULLY .

RUSSIAN BIRCH FACE VENEER GRADING

It is very different from Chinese birch plywood grades.

B FACE VENEER SELECTED FOR ONE PIECE FACE, GENERALLY LIGHT AND EVEN IN COLOR. SOME SMALL, CLOSED PIN KNOTS AS WELL AS LIMITED BROWN STREAKS IS ALLOWED. NO VOIDS, PATCHES OR MINERAL STREAK IS PERMITTED. SURFACE IS SANDED SMOOTH.
S FACE VENEER SELECTED FOR ONE PIECE FACE, GENERALLY LIGHT AND EVEN IN COLOR. SOME SMALL, CLOSED PIN KNOTS AS WELL AS LIMITED BROWN STREAKS IS ALLOWED. UP TO 4 OPEN KNOTS OR VOIDS MAY BE CUT OUT AND REPLACED WITH A SAME SPECIES COLOR MATCHED “FOOTBALL” PATCHES. MINERAL STREAK IS PERMITTED. SURFACE IS SANDED SMOOTH.
BB FACE VENEER SELECTED FOR ONE PIECE FACE, GENERALLY LIGHT AND EVEN IN COLOR. SMALL PIN KNOTS AND MINERAL STREAK ALLOWED. OPEN KNOTS AND DEFECTS ARE CUTOUT AND REPLACED WITH SAME SPECIES COLOR MATCHED “FOOTBALL” PATCHES. FACEIS SANDED SMOOTH.
CP FACE VENEER GRADED OUT FROM BB FOR SMALL DEFECTS AND MINERAL STREAKING. TYPICALLY HAS MORE “FOOTBALL” PATCHES THAN BB AND PATCHES MAY NOT BE COLOR MATHCED. SOME OPEN SPLITS UP TO .5MM ARE ALLOWED. FACE IS SANDED SMOOTH.

 

CHINESE BIRCH PLYWOOD GRADING

According to HPVA or IWPA the birch plywood only have several grades like B/C ,C-2 or C/D ,B-2 ,D-2 or D/E ,E/F or E-2 ,F/F. But due to competition, Chinese created more grades like C+/D or D+/D or D+/E ,E+/F ….

How to grade them by manufacturing defects, natural defects and apperance? Maybe one factory has one grading rule. If you want to buy the right grade birch plywood from China, have to make sure you can understand the birch plywood grading rules of your supplier.

 

 

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