Laminated board consists of thin layers of wood bonded together; similarly, laminated fabric consists of two or more layers of cloth joined together with an adhesive, or a layer of fabric bonded to a plastic sheet.

1. Laminated Wood
PREPARED BY: MONTASIR SHAMIM

2. Laminated wood
A manufactured product
May be straight or curved
Where two or more parallel-grained layers or lamination of plunks bond
together with adhesive
Adhesive is needed in almost all laminate.

3. Laminated wood
The fundamental difference between laminated wood and plywood that
laminated wood has veneer or plies at right angles to each other.
The individual member of wood comprising the laminate is called
lamina.
The number, size, shape and thickness of laminae may very in any
particulate laminate.

4. Manufacture
Laminae are dried in kiln or veneer dryer to a moisture content
between 3-5% and 10-12%.
It depends on the adhesive and the pressing method.
Moisture content of the laminae in any single assembly should be
uniform.
Pieces with case-hardening, warp, checks and splits are discarded or
defective portions cut out.

5. Manufacture
Wood board is surfaced preferably by machines.
The final surfacing is done just before gluing.
The surface should be smooth and true and free from machine mark.
The pieces are sawn true and uniform width.
Pieces are jointed end to end with adhesive for longer and edge to edge
for narrow boards.
Edge to edge are as strong as wood itself.

6. Manufacture
The laminate are arranged in the proper order and spreads with
adhesive.
Thin laminae are preferable for curved laminates as these
retain shape better after pressure is released.
Thick laminae require higher pressure, and jumps back after
pressure.
Generally pressures between 10.5 and 17.5 kp/cm2 for dense
wood and 7.0 and 14.0 kp/cm2

7. Manufacture
For adhesives requiring high temperature for setting, hot presses may
be used.
For curved assembly, the glued laminations are put in oven or heated
chamber.
Laminates with probable exposure to bio-degradable environment
should be made with heartwood or naturally durable species.
For non-durable woods, treatment with preservatives are required.
Fire protection may be used.

9. Adhesives
Synthetic resin adhesive appropriate to end-use requirement are
exclusively used now-a-days.
Resorcinol-formaldehyde (RF) are most appropriate.
But it is cost effective.
Phenol formaldehyde-resorcinol formaldehyde (PF-RF) can be used for
external use.
Phenol formaldehyde resins requires hot pressing.
Urea formaldehyde (UF) moderately resistant to moisture and
temperature.

10. Use of laminated board for
plywood
Depending the width of the stripes making up the core the core
plywood is called-
Battenboard: consist of strips of wood wider than 30 mm.
 Blockboard: consist of stripes of wood having wide 30mm and 7 mm.
Laminboard: consist of stripes of wood or veneer not more than 7mm.

11. Advantages
More complete utilization of wood.
As such wood, the forests are conserves.
Technology is eco friendly.
Seasoned condition is ensured.
Provided with beautiful architectural design.
Different structures can be made.
Selective and dispersed placement of knots ensures use of inferior
materials in superior uses.

12. Limitations
Careful processing of wood for gluing.
Require extra equipment and machineries.
Require skill manpower.
Curved and large laminates are difficult to transport.

13. Uses
Furniture parts
Cores of plywood
Sport goods
Door-window

14. Thanks