Jamila Sampson Why You Should Use Relative Humidity (RH) Testing, Become a Wagner Meters Authorized Distributor, Flooring, Millwork, Furniture and Cabinet Manufacturers, Musical Instrument Manufacturer and Luthiers, Building Restoration and Inspection Professionals. Debarking is to safeguard saws and other equipment from undue wear and damage that would otherwise result from stones, metal and other such contraries embedded in the bark; debarking also facilitates the head sawyer to evaluate the timber. and clipping, 1.3.1 Log sorting, conditioning and barking, 1.4.2 Particle drying 0000062243 00000 n Whereas the pre-presses may be of the hot or cold type, the main press is always heated, by passing hot water, steam or oil through the platens to attain temperatures in the order of 140-200°C, depending on the resins in use and the type of press. 0000198982 00000 n 0000007660 00000 n Sawmilling is a less sophisticated activity of the mechanical forest industries. Many of the processes involve the introduction of chemicals and other additives that help to prepare the raw wood for use. On leaving the headrig, resaw or edger, the lumber is cut to standardized lengths, edges squared and defects removed by the use of one or more fixed or moveable trimming saws, whereupon the lumber proceeds to be sorted and graded. Although in the larger modern installations both pressing time and pressures are automatically regulated, hand control is still preferred in many plants as it permits adjustments to be made for the different mat qualities. ), sawdust drying (if the raw material contains moisture of more than 18%), wood pellets pelletizing, wood pellet cooling, biomass pellets packing. 46 0 obj <> endobj xref 46 61 0000000016 00000 n Required fields are marked *. In most cases, particle production involves a certain number of operations as described below (see Figure 3) which require different amounts and types of energy. I will assume only two things: that you are starting with clean, new wood, and that you have The green veneer is then clipped to size, either manually or by high-speed knives, graded and stored in piles ready for drying. Drying: Lumber is kiln-dried to facilitate natural MC evaporation. Heat is produced by the combustion of oil, gas or process residues. 0000013583 00000 n Figure 1 provides a layout of a typical plant and a description of the main processes to familiarize the reader. and clipping I want the earrings to be made of very thin wood board or some other lightweight material. 0000010633 00000 n Particles are separated according to size, for the purpose of grading the furnish for the board face and core layers. The sawn and trimmed timber is sorted according to thickness, width, length, quality, grade and species depending on the market requirements; such an activity may be undertaken manually or, in the case of mills where low-cost labour is not available, by mechanized sorters. 0000198287 00000 n Throughout its transformation process, wood’s inherent moisture content (MC) fluctuates according to the relative humidity (RH) and temperature of the surrounding air. Kiln-drying involves the drying of stacked veneer in batches or the continuous drying of sheets which are mechanically conveyed either on a continous belt or roller system through the length of the dryer. The amount of moisture at that point is called the equilibrium moisture content (EMC) and this depends mainly on the RH and temperature of the surrounding air. 0000002883 00000 n Adhesives in the form of urea, phenol and melamine formaldehyde are generally used to bind together the particle mix, with the former being the most favoured resin in use. Any defects, such as knots and splits, are then cut out of the sheet. From this inventory process flow template you can see two ways to present the inventory management process - using charts and using graphics. 1.3.6 Finishing. In the more modern particleboard plants mat forming is a wholly mechanical process, whereas the older formers require manual equalizing. %PDF-1.5 %���� 0000007010 00000 n 0000014230 00000 n Debarking of logs, whether it be undertaken manually or by mechanical debarkers, in the forests or at the mill site, is now becoming a generally adopted practice.

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