This work is supported by project CFC/ITTO/72 PD103/01 Rev.4 (I) “Demonstration of Rubberwood Processing Technology and Promotion of Sustainable Development in China and Other Asian Countries”, which was financed by ITTO and CFC, and executed by Research Institute of Wood … In order to meet set standards as to thickness and surface quality, a combination of knife planers and belt or drum sanders may be used. %PDF-1.6 %βγΟΣ Kiln drying usually requires controlling the EMC conditions of the wood by monitoring and controlling the RH and temperature in the kilns. 1.4.5 Board finishing. Between three and ten percent by weight of resin, together with other additives used to impart such properties as fire resistance, etc., are blended under controlled conditions in batches or as a continous operation. 0000007567 00000 n Nevertheless, independently of the nature of the processes and activities involved, all actions aimed to save energy require a detailed analysis of existing processes and possible solutions. On arrival at the mill's storage yard, logs are sorted and stored according to species, diameter, length and end-use, etc. Plywood production - A simplified process flow. 0000006258 00000 n trailer <<41814D021118421D8386753A4C982FD1>]>> startxref 0 %%EOF 106 0 obj <>stream We may share your information with our social media, advertising, and analytics partners. Before the log is presented to the headrig for breakdown, it is cut to the longest permissible straight length with a cut-off saw, whereupon it is loaded onto the headsaw carriage and positioned in such a manner as to allow the operator to achieve a sawing pattern, which will result in the optimum production of sawntimber with the minimum of waste. Nowadays, in almost all cases, plywood veneer is rotary cut, in that the peeler block is rotated around its axis in a lathe, whilst a continous veneer sheet is cut by a knife mounted parallel to the block's axis. To protect the sawntimber against attack from fungi and insects, as well as to inhibit the tendency of air-dried lumber to check and split, the ends may be brushed either manually or mechanically dipped in a suitably prepared chemical solution. ), sawdust drying (if the raw material contains moisture of more than 18%), wood pellets pelletizing, wood pellet cooling, biomass pellets packing. We use cookies to personalize your shopping data and ads. Heating of the platens is generally by hot water or steam, although thermic oil is used when pressing at higher temperatures. 1.1 Introduction Today, I bring it all together with an annotated flow chart that shows the order of those steps, which steps are mandatory and which are optional, and what questions you should ask in order to tell the difference. Particles are separated according to size, for the purpose of grading the furnish for the board face and core layers. Sketch A Wood Processing Chart Grading is a means to segregate the lumber according to the overall quality, direction of grain, presence of knots and defects, as well as general appearance, etc. Can you recommend a company that that could create this with my digital artwork images? Wood that has not been seasoned and still has a high water content is called ‘green wood’. 0000014948 00000 n In Figure 2, a typical plant layout is provided to illustrate to the readers the processes involved. 0000003885 00000 n Blending may either take place in large vats at slow speed, or in small blenders with rapid mixing and shorter blending times. Drying: Lumber is kiln-dried to facilitate natural MC evaporation. x�c```g``�d`a`x�� �� �@����������f&� ˬ��n=���8���iA 0�3�3��n�����s`gc.�3 w�ӻ(���2 �E� In previous positions, he has served as Regional Sales Manager, Product and Projects Manager, and Sales Manager for manufacturers involved in measurement instrumentation. sorting, conditioning and barking, 1.3.2 Peeling, reeling It's up to your own purposes. Once the boards have been surface finished they are cut to size along their length and widths with a combination of saws, according to the dictates of the market. The following process descriptions of the manufacture of sawn timber, plywood and particleboard are of a general nature and should provide the reader with a broad outline of the production processes involved in the mechanical wood-based industry and the role in which energy plays a part. 0000004363 00000 n 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. and clipping, 1.3.1 Log sorting, conditioning and barking, 1.4.2 Particle drying Home » Forest Products » Industry Information for Lumber Companies & Kiln Dryers » Wood Manufacturing Process. 0000014230 00000 n Transportation of the mats to the pre-press and hot press is undertaken by either forming the mat on metal plates, called cauls, which are then either manually or mechanically wheeled to the presses, or in the case of caulless systems, by using flexible metal webs, plastic belts and trays that transport the mats through to the hot-press. 1. 0000013365 00000 n I will assume only two things: that you are starting with clean, new wood… 0000002190 00000 n Although hand roller spreaders is a widely used method of glue application, developments in alternative systems have led to the adoption of curtain coaters, extruders, spray booths, etc., each with their own following. 0000013583 00000 n Planing: Smoothing the surface of each lumber piece and making its width and thickness uniform. The two most common kilns are the batch and progressive type. 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. 0000002332 00000 n 1.4.4 Pressing The formers may be fitted with single or multiple forming heads, which are either stationary or moving, and are so designed that the finest particles are delivered to form the surface layers of the mat and the coarser materials to form the core. 0000001922 00000 n �=�=�F"��lFu)�" �@��)�4����A�4� T5d��L?310݈���� o%� x�cbd```b``�&?�H�M �y Screening normally takes place after the dryers as moist particles tend to stick together, plugging screen plates and lowering the overall efficiency of the screening process. 1.2.4 Drying Wood that has had its water content reduced is called ‘seasoned wood’. Plywood is a wood-based panel product comprised of a collection of veneers that are glued together with a resin. Debarking of the logs then takes place so as to facilitate the lathe operator's task and to remove the dirt and debris which would otherwise prove detrimental to the lathe knife, whereupon the logs are cut to length to fit the lathe, which is normally 240-270 cm. 0000010892 00000 n Sawing of the log is achieved by the use of a bandsaw or a circular saw with a second saw mounted vertically above the first in the event of sawing large diameter logs. As Sales Manager for Wagner Meters, Ron has more than 35 years of experience with instrumentation and measurement systems in different industries. 30 0 obj <> endobj 81 0 obj <>/Filter /FlateDecode/Index [30 52]/Info 29 0 R/Length 88/Prev 187013/Root 31 0 R/Size 82/Type /XRef/W [1 3 1]>> stream Flash drying is now being considered an acceptable alternative to rotary dryers and requires somewhat lower drying temperatures. I would like the items to be imprinted with my artwork. Generally boards are manufactured in the medium-density range of 400-800 kg per cubic metre, although high-density board of 800-1120 kg per cubic metre is used as core stock. Free Download Process Flowchart Templates Online. Pre-pressing of the mats prior to the introduction in the multi-platen hot presses, is now becoming a common feature in the pressing operation, due to the consolidation and reduction in mat width. %PDF-1.5 %���� Particle drying is a continuous process with the particles moving along the length of rotating horizontal dryers whilst being suspended and exposed to hot gases or heat emitted from tube bundles which convey hot water, steam or thermic oil. 1.3 Plywood production Many of the processes involve the introduction of chemicals and other additives that help to prepare the raw wood for use. In spite of the wide variety of formers currently available, the underlying principles of mat formation are generally similar, in that a uniform flow of particles are fed to the former from a surge bin, which in turn meters an evenly distributed layer of particles into a frame on a moving belt or caul.