BIRCH PLYWOOD

Specification Birch Plywood :

1. Core veneer

• Eucalyptus, Acacia
• Legally harvested wood, 8-14 years old
• Thickness: 1,7mm or 2mm
• Moisture content: below 20%

100% the sheets will be inspected and classified:

• A grade: Flat, good surface, no holes, fully 4 edges, no defect.
• B grade: flat, good surface, 1-3 small holes, fully 4 edges

Generally, the sheets that used to manufacture is A grade, with some B grade.

2. Glue

• E0 Carb P2

• The glue will be mixed with flour and some color, creating a complete liquid, with high adhesive.

3. Face Birch

The face is graded according to number of knots.

• C grade:No black strips, no knots, no patching, flat.
• D+ grade: 1-3 knots, few black strips, no patching, flat
• D grade: 3-5 knots, some black strips, patching accepted, flat
• E grade: more than 5 knots, some black strips, patching accpeted., flat

Thickness: 0,27-0,3mm

MANUFACTURING PROCESS OF BIRCH PLYWOOD

Step 1: Sort the core veneer

Our worker sort out the core into grade A, B. The veneers that do not meet the requirements will be rejected

Step 2: Sand the edge

A grade core veneer will be sanded on both short egdes, in order that when it is laid up together, the plywood is not overlapped too much, resulting in even thickness.

Step 3: Glue the core veneer

The veneer sheet will be passed through a gluing machine, so that it will be fully coated with glue.

Step 4: Arrange the core

• The sheet are arranged in lines, one wet layer and then one dry layer.
• The outer layer will use all white A grade veneer
• The worker will patch carefully with B grade veneer.
• The edge-sanded sheets put along the line will be fixed with plastic staplers

Step 5: Cold press the core

The arranged veneer sheets will be put into the cold press machine, with at least 4 pittons, high pressure to form the shape in about 8 hours

Step 6: Repair the core

Our worker will cut and reject the excess veneer, and cover the gap of veneer if necessary. The core must be full, flat afterward.

Step 7: Cut

After cold pressed, the core will be cut (1st time), removing the excess egde.

Step 8: Hot press the core

• The core sheet will be put into the hot press machine, one tray for one sheet
• Time of pressing depends on the thickness, for examples 25 minutes with 15mm, 40 minutes with 20mm,…
• The pressure and temperature is set up by our experienced workers

Step 9: Putty and sand the core (1st time)

• Workers will use putty powder to put in all the tiny gaps on the surface of the core.
• Then the sheets will be naturally dried up in 3-4 days When the putty is fully dried up, the sheets will be sanded carefully.
• This time sanding is to break the rough surface.
• Both sides of the sheet will be sanded.

Step 10: Putty and sand the core (2nd time)

• Workers will use putty powder again to put in all the tiny gaps on the surface of the core.
• After the sheet is dried up, it will be sanded for the second time by another machine. This machine is used to make the surface smooth completely before we put the birch face in.

Step 11: Glue the core

The sheet is coated with anti-core exposure glue, this is to make the product to have good appearance.

Step 12: Check the surface of the core

Core will be checked again, any tiny holes or defects will be fixed before processing next step

Step 13: Glue and paste the face

After the core is checked, it will be coated with glue in order to put the face veneer. The glue used is same as the glue we used to bond the core. The faces are carefully put on the glue coated core

Step 14: Hot press the face

Then the sheet will be hot pressed in about 6-7 minutes, at temperature about 110-120 degree, pressure of 110-120kg

Step 15: Cut

The sheet is cut into the size as required, normally 1220x2440mm by automatic cutting machine.

Step 16: Repair the face

Our worker inspect the face of the sheet, if it is swollen, or missing or torn, they will repair, using the glue

Step 17: Sand the surface

The sheet is sanded for beautiful and smooth surface. This step make the sheet look a little shiny.

Step 18: Inspect the plywood

The sheet is inspected carefully by our experienced workers, in order to minimize the risk for our customer

Step 19: Tie up and pack

Before being delivered to our dearest customers , every plywood sheet will be thoroughly inspected 1 by 1 by our experienced and highly skilled QC team to minimize the risk of receiving defective goods for the buyer. Our workers carefully check the dimensions, thickness, moisture content , face and back, edge, ,strength …of each piece. Besides, for the 11mm up thickness, the QC team also use wooden hammer to knock on several points of the sheet and listen to the sound to inspect the structure and inside delamination.

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