The woods obtained from coniferous trees like deodar, fir, pine, spruce, chir etc. The most common and effective commercial process for drying wood is kiln seasoning, which accelerates the process of removing moisture through the … She is an Engineer (Civil) at SDCPL – Gharpedia. It depends on the temperature of the air injected into the chamber where the timber is piled and on the rate at which the air is circulated and extracted from the chamber. freshJy cut and green. Air dried lumber is suitable for exterior use, and green timber is also frequently allowed to partially air dry prior to kiln drying. Let us discuss the objectives, advantages, types, and methods of seasoning of timber. (iii) Due to attack by fungi and insects. Natural Seasoning : Timber pieces can either be stacked horizontally or vertically and the seasoning is carved out by natural air. Detail explanation along with advantages and disadvantages of these methods of seasoning is discussed below. The actual time of drying depends upon the size of timber, species of wood and seasonal variations of climate. In natural or air seasoning of timber, the timbers of convenient sizes are stacked under a covered shed in a cross-wise direction in alternate layers to permit free circulation of air. In air seasoning, the boards are stacked and divided by narrow pieces of wood called stickers so that the air can circulate freely about each board. They are natural or air seasoning and artificial or kiln seasoning. The interest costs on holding stock for long periods can prove significant. Improve the working properties of timber so that it can be smoothly worked on during conversion. The stack raised well clear of the ground, vegetation, etc to provide good air circulation and free from rising damp, frost, etc. Due to the process of drying is quick; continuous attention needs to be given to check seasoning defects such as warping, internal cracks, surface cracks and end- splits. Describe the formation of block board.Answer: Block board is made up of layers of natural timber up to 25mm in thickness, glued together and veneered.7. Natural Resources FlJRN1lUR.E MANUFACTURING Seasoning of Wood By C A Eckeiman . Various defects which are likely to occur in timber may be grouped into the following three: (i) Due to natural forces (ii) Due to defective seasoning and conversions. Natural Seasoning and Artificial Seasoning. Trees give us the timber, which is converted into the required form and finally used. Trees give us the timber, which is converted into the required form and finally used. In humid areas this may be necessary if a dry kiln is not available. Moderately refractory timbers can be dried and can be made free from surface and end cracking within reasonable short periods. Before […] This is such an important stage in the drying that it is given a special name, and the term is "fibre saturation point". Natural seasoning as the name suggest is the natural way of removing moisture from timber. 2. Unsupported ends of boards placed on the inside of the pile will dry with fewer defects than if allowed to extend over the end of the pile. The example of highly refractory woods are heavy structural timbers, i.e. To give strength, hardness and to make electrically resistant. In other words timber should be dried. It is normally placed in a hut / building, with two sides open to allow air to circulate. Most air seasoned material is dried in flat piles with stickers placed between layers, but when it is essential to have rapid drying to prevent sap stain, end piling may be used. It is a time-consuming process and takes 2 to 4 weeks before ready to dry. (II) Air Method. for 1+3, enter 4. process of removing this . These defects in timber can be due to natural forces, fungi, insects, and during seasoning and conversion. The thick end of the wood … Unfortunately, timber being natural possesses different types of defects. After boiling timber... Chemical Seasoning. Seasoning is required for following purposes . An adequate supply of wooden sticks (spacers) will be needed to separate each layer (Figures 1 and 2). 1.8. 1.4. Sawn timber is stacked in a dry place about 30cm above floor level with longitudinal and cross pieces arranged one upon another, leaving space for the free circulation of air. Timber seasoning reduces the risk of fungal attack. AIR SEASONING The easiest way, but not the most effective method of seasoning timber, is to stack it outside. The timber seasoned by this method is less liable to shrinkage. The water is to be removed before it used for engineering purposes. The various methods of artificial seasoning of timber are: Kiln seasoning is a rapid method of timber seasoning that reduces the moisture content in the timber. Generally, air seasoning is a slow process. It also gives a little protection against rapid drying conditions. The . In natural seasoning, timber is dried by natural elements like air and water. In semi-kilns, where the temperature is maintained at 110 °F to 120 °F and fans are used to circulate the air, green stock may be dried to 8 to 12 percent moisture content in 3 months. mOisture . Material cut from the oaks, sycamore, beech, maple, and other woods which have large rays will surface check readily and consequently thick material cut from these trees is given special treatment. Timber is an important construction material. In this method, a pile of ripped wood is placed and placed in a dry place. Due to this heat is generated during the process, which results in its drying. If wood is cut to size before it is seasoned, it ... To reduce or eliminate attack by decay or stain. Care should be taken not to expose the freshly converted timber stacked for seasoning to severe winds or to sun. There are mainly two methods of seasoning of timber. • The process of drying of timber is known as seasoning of Timber. It requires skilled labour. Water Seasoning of Timber. In this method timber immersed in water flow to remove the sap from timber. Summing up, Timber Seasoning is the first step in the efficient utilization of timber, especially where several commercially important species of wood are hard, heavy and prone to develop defects during drying. There are multiple advantages to having wood artificially seasoned that relate to the quality, strength and cost of the wood. Let us know in the comments what you think about the concepts in this article! By natural process, the timber is seasoned. Natural seasoning or Air seasoning. The natural method of seasoning is carried out with the aid of natural factors mainly air and water. The main objectives of seasoning of wood are to: Classification of Timbers for Seasoning Purpose. 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