5-Ply ,7-Ply thick core veneer plywood Inspection and QC checklist
THick core veneer plywood in China ,it is hard to produce ,because of the limited log diameter ,hard to peel thick core veneer ,when producing the thick core veneer plywood ,need selected good core veneer .
Now ,in order to reduce the formaldehyde emission ,most of the thick core veneer plywood are used for melamine plywood in China .Also some foreign buyers use this thick core veneer plywood to make platforms and lamination .
In China ,normally 18mm have 9 plies ,11 plies and 13 plies ,this is standard core veneer thickness and quantity .But if produce 5 plies or 7 plies ,first is thick core veneer ,second is the core voids and overlaps are difficult to control .
1.Check the thick core veneer plywood core voids and overlaps
2.Scarf joint core veneer can avoid the overlaps and core voids
3.Straight core veneer ,no missing core veneer
So ,when inspect the thick core veneer plywood ,should be very careful .
If produce oversize or jumbo size plywood ,it is still hard to produce .