Monday, October 2, 2023

Blockboard : Properties, Types, Manufacturing, Advantages & Disadvantages of Blockboard

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Blockboard may be defined as a type of engineered compound plywood board where softwood strips are attached edge to edge and bonded jointly machining generally a sandwich structure setting hardwood between them.

Blockboard is majorly available in various sizes and thicknesses. The standard size of the block board is 2440 x 1220 x 30 mm.

  1. Technical Properties of Blockboards 

The technical properties of black boards are as follows:

a. Modulus of elasticity long

b. Density

c. Bending strength

d. Bending strength cross

e. Formaldehyde emission

f. Modulus of elasticity cross

g. Fire safety category

h. Thickness tolerance

i. Length and width tolerance

 

 


 

 

  2. Types of Blockboards  

The classification of block boards mostly relies on various factors such as quality, use, and raw wood employed for the core.

The followings are the type of block boards:

Depending on Quality and Use:

a. Interior Grade Blockboard

b. Exterior Grade Blockboard

 

Depending on the Raw Wood Used in the core:

a. Softwood Blockboard

b. Hardwood Blockboard

 

Various aspects of these types are well described below:

 

a. Interior Grade Blockboard

These grades are produced for indoor services and are unsusceptible to moisture Known ass MR (Moisture Resistant). For example Furniture, door, and window shutter.

 

b. Exterior Grade Blockboard

This type of block board is produced for outdoor uses. Exterior grades are known as BWP (Boiling Water Proof) or BWR (Boiling Water Resistant).

This high quality of resistance is because the adhesives employed here are also useful in quality.

 

c. Softwood Blockboard

Solid blocks of wood are employed to prepare each block board sheet which is attached jointly employing glue.

The sheets are called strips or battens.

The surface is coated with hardwood surfaces.

 

d. Hardwood Blockboard

Generally, Hardwood is dense, heavy, costly, and strong as the core is produced from hard sheets.

The layer is also by hardwood.

 

 


 

 

  3. Manufacturing of Blockboard  

The followings are the steps of block board processing:

 

a. Slicing

The logs of timber are cut at first for making the raw blocks. The strips can be 25 mm.

 

b. Rotary Cutting

For the outer layer, logs are trimmed at rotary cutting. Thus veneer for coating is acquired.

 

c. Gluing

To connect the pieces glue or adhesives are employed, For example, Urea formaldehyde, Phenol formaldehyde which is known as a plastic resin.

The exterior grade block board needs phenol-formaldehyde. Gluing is accomplished under high pressure.

 

d. Drying

The blocks are dried to decrease the moisture as well as water content left inside the blocks. For drying the blocks are preserved before the sun.

The moisture content is decreased to 10-12%. After appropriate drying, they are prepared for producing a sandwich.

 

e. Attaching

Blocks are connected together employing softwood or hardwood as needed for interior or exterior grade needed.

 

f. Finishing

Last finishing offering lamination, a coating is accomplished.

 

Manufacturing of Blockboard

 

 


 

  4. Uses of Blockboard  

The uses of Blackboard are as follows:

a. For furniture production such as tables, benches, beds, etc.

b. For shelving such as long bookshelves, and worktops as heavier structures.

c. For windows, door shutter, flush door.

d. For preparing wall furniture.

e. They do not slag in the middle or does not bend easily, so it is a selection for carpenters.

f. For wall panels, partition.

 

 


 

 

  4. Benefits of Blockboard  

The  benefits of black boards are mentioned below:

a. The soundness of blockboards is well-sufficient stability. These can actually offer stability in humid surroundings that possess moisture resistance.

b. They are cheap.

c. It can carry varnish, paint, and laminate coat on the surface by employing glue. Block boards are suitable for screwing and nailing.

d. For warping or twisting this is the right option for its opposition quality.

e. They can have screws, nails, and laminating coat and for this, it is comfortable to work on it.

f. Carpenters can efficiently employ their wood processing tools also for block boards.

g. The lightweight blockboard produced is suitable to employ. The bulk of the board completed up of core blocks is also famous for its lightweight as produced from softwood and is effortless to transport.

h. BWP, one type of blockboard is stronger adequate, and invulnerable to water and humidity.

 

 


 

 

  5. Drawbacks of Blockboard  

The followings are drawbacks of black boards are mentioned below:

a. They are light in weight so not largely reliable hard material.

b. They are more vulnerable and don’t own long durability.

c. The undesirable void between softwood strips creates them challenging to work for carpenters.

d. Screwing and nailing should be accomplished with great care otherwise it may break.

e. Shrinkage and swelling of the board may appear.

f. Breakdown of the blocking board is not secured.

g. If the strip’s inner is cheap, low-quality wood, may be damaged by insects.

 

 


 

  6. References  

1. Content Filter & Authenticity Checking Team, Dream Civil International

(Our team checks every content & detail to maintain quality.)

 


 

 

Read Also: Types of Concrete Admixtures

 

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Er. Madhu Krishna Poudel
Er. Madhu Krishna Poudel
He is a founder and lead author of Dream Civil International and his civil engineering research articles has been taken as source by world's top news and educational sites like USA Today, Time, The richest, Wikipedia, etc.
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