Back to: BASIC TECHNOLOGY JSS3
Welcome to class!
In today’s class, we will be talking about wood conversion. Enjoy the class!
Wood Conversion
Wood conversion is the process of splitting the log at the sawmill with sawing machines into commercial or marketable sizes.
Methods of wood conversion
Methods of wood conversion include:
- Plain-sawn method
- Quarter-sawn timber method
- Tangential saw method
NB: The popular methods of wood conversion are plain sawn and quarter sawn.
- Plain-sawn method: This is the method of cutting log linearly or flatly in a horizontal manner to produce planks. This method is quick, cheap and simple.
- Quarter-sawn method: This is the method of splitting log angularly along the grains on the log. It is usually more technical to split wood using this method. This method needs more attention than the plain-sawn method because the log has to be turned to align the rays.
- Tangential sawn method: This method of sawing plank is the method in which the planks are cut so that their wide edges are tangential to the growth rings.
Wood seasoning
This is the process of reducing the moisture or water content of the wood. Since sawn timber contains some amount of water, it must be seasoned before using them.
Reasons for wood seasoning
- Seasoning makes the wood stronger.
- It makes the wood lighter in weight.
- Seasoning makes the wood more stable when being used for furniture work
- Seasoning makes the wood take polish easily.
Moisture content
Moisture content is defined as the excess water in the wet wood. The moisture content is expressed as a percentage (%).
To calculate Moisture content:
[(Wet Weight – Dry Weight) /Dry Weight] X 100
Example: If a sample of wood weighed 80kg before drying and 50kg after drying, what is the percentage moisture content of the wood sample?
Moisture content = [(Wet Weight – Dry Weight) /Dry Weight] X 100
=[ (80 – 50) /50] X 100
= (30/50) X 100
Moisture content = 60%
In our next class, we will be talking about PROCESSING OF WOOD (DEFECTS, MANUFACTURED BOARD). We hope you enjoyed the class.
Should you have any further question, feel free to ask in the comment section below and trust us to respond as soon as possible.
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I love your notes with explanation
It s precise, straight to point and useful for examination.
Keep up blessing this generation.
It’s a good class
Good day, My question is about the tangential sawn method, what I mean is that can it also be called rift sawing method.
THANKS.
Your humble student
😁😁
it was very helpful but to put more details and put a summary pharagraph
Thanks but what i needed was stages of wood processing
I want to join officially and your topics are clear
Wow , The online class was interesting