What is block board?
Block board, a variety of engineered compound plywood boards and it is made of from the core of strips of softwood. The strips are laid from side to side and (sandwiched) centered between wooden veneers .On both the sides, a single veneer is there and it is called as 3-ply.
What are the types of block board?
Block boards are classified into 4 types and it is based on its usage, quality and the raw woods.
Based on the quality and usage they are classified into
- Interior Grade Block board
- Exterior Grade Block board
1 .Interior Grade Block board
It is used for indoor use and called as moisture resistant.
For example: Furniture
- Exterior Grade Block board
These types of block boards are used for outdoor purpose. Boiling water –resistant is the other name for the exterior grade block board. High quality adhesives were used for exterior grade block boards
Based on the raw woods they are classified into
- Softwood Block board
- Hardwood Block board
- Softwood Block board
Solid wood is used to make sheets of blockboard that are glued together. The sheets are known as strips. Hardwood veneers are used to coat or cover the surface.
- Hardwood Block board
It is coated using the hardwood. By Comparing to Softwood block board, hardwood block board is very heavy, dense, expensive and strong
What is the size of the block board?
The thickness and size may vary for block boards. Usually, the blackboards are in the size of 2440 x 1220 x30 mm.
Block board manufacturing process
- Slicing
The logs of wood are first cut to make the raw material of the blocks. The strips may be 25 mm.
- Rotary Cutting
For the outer layer, cut the logs in a rotary cutting. So the coating of veneer will be produced.
3. Gluing
Adhesives are used to join the slices/pieces .For example, Urea formaldehyde, plastic resin. Phenol formaldehyde is used for exterior grade block board. High pressure is required for the process of gluing.
- Drying
To reduce the water content and the moisture, the blocks are taken for the drying process. That is the blocks are stored in the sun for drying. Humidity drops to 10-12%. Once properly dried, they are ready to make a structure called sandwich structure.
5. Attaching
For interior and exterior grade, with the softwood or hardwood the blocks are to be attached.
- Finishing/Termination
The termination stage is to do a final coating.
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