Block Board
Blockboard (or laminate) is classified as plywood as it is constructed from at least 3 veneers (face, core and back). However, it differs from plywood as its core is made up of edge laid solid wood strips or veneers that are glued together and then veneered on each side. The presence of solid wood strips ensures that the board will hold nails and screws better than other engineered boards. Although it is lighter than plywood, it will not split or splinter when cut as its core is made up of solid wood strips.
The classification of block board
Raw material composition of blockboard
Blockboard has various front and back surfaces, such as PVC, PET, phenolic film, peeling veneer, HPL veneer, wood veneer, ordinary log, melamine film paper, pre-processed paper, fancy veneer, PE veneer, paint, engineering film and various veneer methods.
The core of blockboard mainly includes pine core, paulownia core, Malacca core：
- Pine core：natural color, maintain the natural color of pine, clear and beautiful texture, strong elasticity, good air permeability, good thermal conductivity, simple maintenance. It is the cheapest core board among blockboards.
- Paulownia core：The core of Paulownia wood is soft, tough, not easy to crack, has strong plasticity, is easy to process and carve, and has the characteristics of corrosion resistance, moisture insulation, not easy to be eaten by insects, and wear resistance. The price is slightly more expensive than the pine core.
- Falcata core：Falcata core has clear texture and looks very good. It has good processing performance, is anti-corrosion, insect-proof, acid- and alkali-resistant, light in weight, and does not deform or crack. The price is more expensive than pine core and paulownia core.
Processing of Blockboard
Followings are the steps of blockboard processing:
- 1. Slicing:The logs of timber are sliced at first for making the raw of blocks. Strips may be 25 mm.
- 2. Rotary Cutting:For outer layer, logs are cut at rotary cutting. Thus veneer for coating is obtained.
- 3. Gluing:To attach the slices glue or adhesives are used eg. Urea formaldehyde, Phenol formaldehyde which is called plastic resin. Exterior grade block board requires phenol formaldehyde. Gluing is done under high pressure.
- 4. Drying:The blocks are dried to reduce the moisture as well as water content left inside blocks. For drying the blocks are kept before the sun. The moisture content is reduced to 10-12%. After proper drying, they are ready for making a sandwich.
- 5. Attaching:Blocks are attached together used softwood or hardwood as required for interior or exterior grade required.
- 6. Finishing:Final finishing giving lamination, a coating is done.
application of Blockboard
18mm blockboard is a common raw material for making commercial furniture such as cabinets. Blockboard panels are made of 3-5 layers, covered with one veneer (or thin MDF or particleboard) on each side, or 5 layers, covered with two veneers on each side for better stability.
Blockboard melamin is used to make doors, tables, shelves, paneling and partitions. It is often used for indoor purposes due to the type of glue used. For maximum strength, it is important to ensure that the core runs lengthwise. Blockboard (also called wood core) has very good screw fixability and can be considered solid wood; it has good resistance to warping.
