Estonia birch veneer production and QC checklists
NOrmally the birch face veneer are whole pieces ,long grain and short grain both ,used for plywood ,furniture ,and other industrial uses .
Many russia ,Estonia veneer producer specialised in production of rotary cut birch veneer. Everything starts with the birch logs. Silver birch (betula pendula) is the most common tree.
When the logs arrive in log yard, they are measured and sorted on a log sorting line.
Log sorting line
Logs to veneer
The logs are soaked in a pool before the veneer can be peeled from them.
Birch logs in soaking pool
After soaking the birch logs are debarked. Then they are sent to the lathe where birch veneer is peeled from them. The log is centred on a lathe and turned against a broad cutting knife set into the log. Our peeling line enables us to produce veneer up to the length of 1850 mm. This is also the grain length. The maximum veneer width can be 2500 mm.
Lasers on XY-charger
Peeling line and veneer ribbon
After peeling the veneer is fed into the dryer. Kiln drying ensures stable humidity of the veneer.
We check the moisture contents of our veneer with a moisture analyser from Sartorius, that uses the oven-dry method. This method is said to be the only reliable method to determine the humidity. Handheld moisture meters are only trying to estimate the oven-dry moisture content.
veneer moisture analyser
After drying the veneer is sorted according to the customer requirements. Usually, we put A and B grade together on the same pallet and C grade on separate pallets.
Veneer sorting after drying
The veneer is packed onto pallets and the packs are labelled. Then the veneer is ready for loading and transport.
The veneer can be cut to size or narrower strips can be put together with glue threads. The threads are put on one side of the veneer. They keep the narrower veneer pieces in place. Such composed veneer sheets can effectively be used as core layers in plywood or bed slats.
Another possibility is to splice the veneers using zigzag machines. Such machines also use glue threads for joining the veneers.
veneer splicing with zigzag glue threads
The veneer is produced on customer orders.