When you buy blockboard,please make sure you can understand a little knowledge about the blockboard in China.Blockboard ‘s core construction are much variation ,two different types are butt joint (edge to edge ) ,another type is finger joint .Now,a new generation lumber core construction was created by some manufacturers,named T core .Like the pictures shows ,quality are not stable and lower prices than regular lumber core butt joint or finger joint .
2.T core (trapezium core )
4.Half round Core
5.Recycled PLYWOOD blockboard
The whole quality of the core are also decided by the whole core construction .
If the manufacturers using the following core construction :
Face veneer+poplar short grain veneer ( 3 pices AAA grade core veneer under the face veneer )+Poplar crossband veneer (Long grain )+Lumber core +Poplar crossband veneer (Long grain )+poplar short grain veneer ( 3 pices AAA grade core veneer under the face veneer )+back veneer.
This quality are good .
But some factories are only using one layer poplar for the lumber core before laminating the face and back ,that is
Face veneer+poplar short grain veneer ( 3 pices AAA grade core veneer under the face veneer )+Lumber core +poplar short grain veneer ( 3 pices AAA grade core veneer under the face veneer )+back veneer.Reduced two layers of “Poplar crossband veneer (Long grain ) “
This quality are much lower than the first one .No matter it is finger joint or butt joint or T core .
Another quality point is ,how many pieces of long strips of the lumber core ?This is very important to decide the final quality of the blockboard.If the lumber joint tightly without space or not ?or short in size ?
Blockboard is a wood based panel, made up of a core of softwood strips glued together. The strips may be up to about 28mm wide and are placed edge to edge and sandwiched between veneers of softwood, hardwood or thin MDF or particleboard, glued under high pressure.
The internal strips are generally made of light weight poplar wood or spruce.
Blockboard is used to make doors, tables, shelves, paneling and partition walls. It is normally used for interior usages, due to the type of glues used. To achieve maximum strength, it is important to ensure that the core runs lengthways. Blockboard (also called lumber core) has very good screw holding and can be considered as solid wood; it has a good resistance to warping.
Blockboard panels are produced in 3-layers, with one veneer sheet (or thin MDF or particlebaord) covering each side, or 5-layers with two veneer sheets per side for better stability.
Most common sizes in blockboard are: 2070x5200mm (german size), 1850x3660mm (italian size), 1220x2440mm (chinese size).
Available thicknesses are between 13mm and 60mm.
Blockboard may be purchased with a variety of applied finishes such as wood veneers, melamine paper and plastic laminate surfaces.