Timber- VOT

Explain the different parts of a tree

Trees have three main parts - the leaves, the trunk, and the roots. The upper part of the tree with the branches is called the crown.

Outer bark

The outer bark is the tree's protection from the outside world. Continually renewed from within, it helps keep out moisture in the rain and prevents the tree from losing moisture when the air is dry. It insulates against cold and heat and wards off insect enemies.

 

Phloem

Phloem transports carbohydrates, produced by photosynthesis and hydrolysis of reserve compounds, to sink tissues for growth, respiration, and storage. At photosynthetic tissues, carbohydrates are loaded into the phloem.

 

Cambium

The cambium cell layer is the growing part of the trunk. It annually produces new bark and new wood in response to hormones that pass down through the phloem with food from the leaves. These hormones, called “auxins”, stimulate growth in cells.

Xylem

Xylem, plant vascular tissue that conveys water and dissolved minerals from the roots to the rest of the plant and also provides physical support. Xylem tissue consists of a variety of specialized, water-conducting cells known as tracheary elements.

Heartwood

The heartwood functions as long-term storage of biochemicals, which vary from species to species. These chemicals are known collectively as extractives.

Describe how trees become timber.

The trees get cut to a set length Then the log gets picked up by a timber lorry, which transports the timber to a processing site such as, sawmill, paper mill, pallet fencing, or construction producer, AT the chosen site the log gets debarked or bucked, Drys out, Cut to length than dressed.

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This is the site where I got my info

Outer bark

Phloem

Cambium

Xylem

Heartwood

Processes of timber 

Defects of tree

Defects in timber.

Defects are visible signs that a tree is failing to grow or live. These are the seven main types of tree defects dead. Wood, cracks, weak branch unions, decay, cankers, root problems, and poor tree form. These seven main types of tree defects are described below.

Different types of cut,

There are three different types of cuts in timber. Quartersaw, Riftsaw, and Plain saw

Quartersaw

- This reveals a different face for the board, giving straight grain, and the end of a board shows growth rings 60-90 degrees to the face of the board.

Riftsaw

-riftsawn wood is the least effective and most expensive means by converting a log. But it is the most stable.

Plain saw

-plain saw is just a straight cut wood. it is the most common type of cut due to it being the most inexpensive and easiest way to cut the wood.

In New Zealand, we use four main timbers Kauri, Matai, and Rewarewa, and Rimu These timbers are chosen on the basis of their colors, grain patterns, and workability, which lend them to be creatively used.