MANUFACTURING PROCESS

Plywoods are manufactured by the procedure as follows :

• Timber logs are soaked in water to make them workable on various machines.
• Thin Sheets of Veneers are peeled from the logs. During peeling knots, barks and other natural defects are removed. The good quality of veneers are then send for drying.
• Drying is done in seasoning chambers, moisture content from the wooden veneers are brought down to approximately 5 to 10%. If there is higher moisture content, the absorption of bonding glue is affected. Thus for proper manufacturing of Plywoods it is important to bring the moisture content low to aid absorption of bonding glue.
• Glueing is done by passing the veneers through Glue Spreader which spreads bonding glue (Phenol phormaldihyde) on both sides over the veneers.

CONSTRUCTION OF PLYWOODS

The Veneers are stalked, one above the other, alternatively along and across the grains to the required thickness of plywood. Face veneers on both the top and bottom layer is put into construction here. The Film is also laid during the construction on top and bottom of the Face Veneers, for manufacturing of film faced shuttering plywood.

Pressing : The constructed Veneers layers are sent into the hot press for pressing.  Pressing time and temperature depends on the thickness of glue type and density of Plywood.  The Plywood sheet with number of veneers is formed after pressing.

Sizing : The pressed sheet of Plywood is then passed through parallel saw to make plywood on required sizes  and right angles at corners.

Testing : One sheet on each lot of Plywood is sent to the lab for testing as per IS codes.  Balance sheets are marked, checked and stalked in dispatch godown ready for dispatch.