CAMPLY is formed when multiple sheets of veneer are glued together face to face so that the direction of the grain on each sheet is at right angles to that of the adjoining sheet. This is known as cross banding and results in a more even distribution of strength over the whole sheet. An odd number of layers is used so that the grain direction of the face and the back are the same.
Advantages of CAMPLY
1) Cutting the veneers
The veneers are peeled from selected high density logs and are peeled to suitable sized finished sheets.
2) Drying the veneers
The veneers are dried to a moisture content of 8-10%, they are either air, kiln, or mechanically dried in a dryer which varies from size and decks.
3) Graining and preparing the veneer
The veneers are graded for use as face centre or backing pieces. Defects such as knots splits and decade areas are trimmed or repaired. If the jointing of veneers is required it is done with immense care and highly skilled labors.
4) Application of glues
Glues such as Melamine Formaldehyde (MR), Phenol Formaldehyde (WBP) and other Synthetic Resins are applied to the centre layers of the plywood as the layers pass through rollers. To make plywood, alternate sheets of veneer are glued and laid at right angles to the adjacent sheet until the required number of layers is reached.
5) Pressing
The assembled veneers are pressed in hot hydraulic presses at a very high pressure. A large proportion of plywood is dried in hot presses. In a hot press the occurring time of synthetic resin adhesives is reduced to several minutes.
6) Re-drying
Veneer absorbs moisture when the glue is applied. The moisture is removed by block stacking the plywood sheets and redrying them to moisture content of 8-15%. Either the kiln or air-drying process is used to do this.
7) Trimming and sanding
The dried sheets are trimmed to size and then sanded. Multiple sanders or belt sanders are used.
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