PLYWOOD BLOCK BOARD
What Is Block Board?Block boards are not recent invention. In fact the Egyptians had conceived and built furniture with block boards in their pyramids dated back thousands of years ago.
Block board (also known as lumber core) is a man-made board similar to plywood but the center layer or core is made from strips of softwood.The strips are put edge to edge and sandwiched between veneers of softwood, hardwood, particleboard or MDF (medium-density fiberboard), pasted under high pressure and heat with glue.
In terms of construction, there are three main types of block board , i.e. 3-ply, 5-ply and 7-ply.
A 3-ply block board consists of a core sandwiched between two layers of veneers whereas a 5-ply and 7-ply block boards are made of a core and covered with 2 layers and six layers of veneers on each side respectively.
The first one is normally used for hidden application. The second is preferred to build furniture that requires decorative quality. The last is utilized more in manufacturing doors and construction.
The picture below shows an example of block boards.