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87-629: In 1971 "old" Gagnef was amalgamated with Floda , forming the present municipality. The industry is dominated by small and semi-small companies mainly operating in the forest industry . Geographically, the two rivers of the Västerdal River and the Österdal River flow together in Gagnef to form the Dal River , as represented in the municipality's coat of arms. This is a demographic table based on Gagnef Municipality's electoral districts in

174-413: A composite material . The sheets of wood are stacked such that each layer has its grain set typically (see below) perpendicular to its adjacent layers. This alternation of the grain is called cross-graining and has several important benefits: it reduces the tendency of wood to split when nailed at the edges; it reduces thickness swelling and shrinkage, providing improved dimensional stability; and it makes

261-454: A low-carbon economy , forestry operations will be focused on low-impact practices and regrowth. Forest managers will make sure that they do not disturb soil-based carbon reserves too much. Specialized tree farms will be the main source of material for many products. Quick maturing tree varieties will be grown on short rotations to maximize output. Brazil has a long tradition in the harvesting of several types of trees with specific uses. Since

348-485: A 7% prevalence of hearing loss. Worker noise exposures in the forestry and logging industry have been found to be up to 102 dBA. NIOSH recommends that a worker have an 8-hour time-weighted average of noise exposure of 85 dBA. Excessive noise puts workers at an increased risk of developing hearing loss. If a worker were to develop a hearing loss as a result of occupational noise exposures, it would be classified as occupational hearing loss . Noise exposures within

435-428: A caveat along the lines of "not suitable for boat In India,marine ply is popularly called "Kitply" after the brand which popularised the concept of water proof marine plywood in the 1980"s. Other types of plywoods include fire-retardant, moisture-resistant, wire mesh, sign-grade, and pressure-treated. However, the plywood may be treated with various chemicals to improve the plywood's fireproofing. Each of these products

522-642: A fuselage made of birch plywood sandwiching a balsa core, and using plywood extensively for the wings. Plywood was also used for the hulls in the hard-chine Motor Torpedo Boats (MTB) and Motor Gun Boats (MGB) built by the British Power Boat Company and Vosper 's, American PT boats , and the Higgins landing craft critical to the D-Day landings. The American designers Charles and Ray Eames are known for their plywood-based furniture, as

609-401: A good log, called a peeler, which is generally straighter and larger in diameter than one required for processing into dimensioned lumber by a sawmill . The log is laid horizontally and rotated about its long axis while a long blade is pressed into it, causing a thin layer of wood to peel off (much as a continuous sheet of paper from a roll). An adjustable nosebar, which may be solid or a roller,

696-539: A high quality standard of product. Their goal is to do this efficiently and safely, at low cost, with rapid production time and high output. Once the timber has been manipulated in the required fashion, it can be shipped out for usage. There are many different purposes for wood including plywood , veneer, pulp, paper , particleboard, pallets, craft items, toys, instrument-making, furniture production, packing cases, wine barrels, cardboard, firewood, garden mulch, fibre adhesives, packaging and pet litter. Western Australia has

783-402: A large number of other hardwoods. Flexible plywood is designed for making curved parts, a practice which dates back to the 1850s in furniture making. At 3 ⁄ 8 inch (9.5 mm) thick, mahogany three-ply "wiggle board" or "bendy board" come in 4 by 8 feet (1.2 m × 2.4 m) sheets with a very thin cross-grain central ply and two thicker exterior plies, either long grain on

870-436: A mix of molecular hydrogen (H 2 ), carbon monoxide (CO), carbon dioxide (CO 2 ), molecular nitrogen (N 2 ) and water vapor (H 2 O). This gas mixture, known as " wood gas ", "poor gas" or " syngas " is obtained after the combustion of dry wood in a reductive environment (low in oxygen ) with a limited amount of atmospheric air, at temperatures of 900 °C, and can fuel an internal combustion engine . Wood

957-431: A press at a temperature of at least 140 °C (284 °F), and at a pressure of up to 1.9 MPa (280 psi) (but more commonly 1.4 MPa [200 psi]) to form the plywood panel. The panel can then be patched, have minor surface defects such as splits or small knot holes filled, re-sized, sanded or otherwise refinished, depending on the market for which it is intended. Plywood for indoor use generally uses

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1044-498: A result, many manufacturers are turning to low formaldehyde-emitting glue systems, denoted by an "E" rating. Plywood produced to "E0" has effectively zero formaldehyde emissions. In addition to the glues being brought to the forefront, the wood resources themselves are becoming the focus of manufacturers, due in part to energy conservation, as well as concern for natural resources. There are several certifications available to manufacturers who participate in these programs. Programme for

1131-519: A single thick layer of wood. Understanding the industrial potential of laminated wood, he invented the rotary lathe . There is little record of the early implementation of the rotary lathe and the subsequent commercialization of plywood as we know it today, but in its 1870 edition, the French dictionary Robert describes the process of rotary lathe veneer manufacturing in its entry Déroulage . One can thus presume that rotary lathe plywood manufacturing

1218-406: A slow process involving significant manual labor. Since sawmills were traditionally located within forests, milled timber had to be transported over long distances via rough terrain or waterways to reach its destination. Logs were later transported via train and tram lines, first by steam-powered log haulers then by steam-powered locomotives , and finally diesel and petrol-powered locomotives. Even in

1305-467: A unique substance called ‘ biochar ’, which is made from jarrah and pine and sometimes from crop and forestry residues, along with the former materials. Biochar can be used to manufacture silicone and as a soil additive. Softwoods , such as the Australian eucalyptus , are highly valued, a are used mainly for construction , paper making , and cladding . The term 'round wood' describes all

1392-443: A younger age produce smaller logs, and these can be turned into lower-value products. Factors such as location, climate conditions, species, growth rate, and silviculture can affect the size of a mature tree. The native hardwood saw-milling industry originally consisted of small family-owned mills, but has recently changed to include a small number of larger mills. Mills produce large volumes of material and aim to ensure delivery of

1479-409: Is Finnish Architect Alvar Aalto and his firm Artek , while Phil Bolger has designed a wide range of boats built primarily of plywood. Jack Köper of Cape Town designed the plywood Dabchick sailing dinghy , which as of 2015 is still sailed by large numbers of teenagers. Plywood is often used to create curved surfaces because it can easily bend with the grain. Skateboard ramps often utilize plywood as

1566-399: Is also a common European size for Baltic birch ply, and aircraft ply. Sizes on specialised plywood for concrete-forming can range from 15 ⁄ 64 to 13 ⁄ 16  in (6 to 21 mm), and a multitude of formats exist, though 15 × 750 × 1,500 mm (.59in × 30 × 59 in) (19/32in × 2 ft-6in × 4 ft-11in)

1653-496: Is burned in the recovery boiler . Thus, these countries have high proportions of renewable energy use (25% in Finland, for instance). Considerable effort is directed towards increasing the value and usage of forest products by companies and by government projects. A forest product is any material derived from forestry for direct consumption or commercial use, such as lumber , paper , or fodder for livestock . Wood , by far

1740-533: Is designed to fill a need in industry. Baltic Birch plywood is a product of an area around the Baltic Sea. Originally manufactured for European cabinet makers but now popular in the United States as well. It is very stable composed of an inner void-free core of cross-banded birch plys with an exterior grade adhesive. The face veneers are thicker than traditional cabinet grade Plywood production requires

1827-702: Is extremely strong and light. Howard Hughes' H-4 Hercules was constructed of plywood. The plane was built by the Hughes Aircraft Company employing a plywood-and-resin Duramold process. The specialized wood veneer was made by Roddis Manufacturing in Marshfield, Wisconsin . Usually faced with hardwood , including ash , oak , red oak , birch , maple , mahogany , shorea (often called lauan, meranti, or Philippine mahogany, though having no relation to true mahogany), rosewood , teak and

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1914-509: Is from 1 ⁄ 8  to 3 inches (3.2–76.2 mm). The sizes of the most commonly used plywood sheets are 4 by 8 feet (1,220 mm × 2,440 mm) which was first used by the Portland Manufacturing Company, who developed modern veneer core plywood for the 1905 Portland World Fair. A common metric size for a sheet of plywood is 1200 × 2400 mm. 5 × 5 feet (1,500 × 1,500 mm)

2001-573: Is higher in the center of the panel, and at the outer fibres. Within Europe basic plywood can be divided into three main categories: birch plywood (density approx. 680 kg/m ), mixed plywood (density approx. 620 kg/m ) and conifer plywoods (density 460– 520 kg/m ). Different varieties of plywood exist for different applications: Softwood plywood is usually made either of cedar , Douglas fir or spruce , pine , and fir (collectively known as spruce-pine-fir or SPF) or redwood and

2088-506: Is made of mixed hardwood species of tropical timber . Originally from the Asian region, it is now also manufactured in African and South American countries. Tropical plywood is superior to softwood plywood due to its density, strength, evenness of layers, and high quality. It is usually sold at a premium in many markets if manufactured with high standards. Tropical plywood is widely used in

2175-508: Is made out of wood from dicot trees (oak, beech and mahogany) and used for demanding end uses. Hardwood plywood is characterized by its excellent strength, stiffness, durability and resistance to creep. It has a high planar shear strength and impact resistance, which make it especially suitable for heavy-duty floor and wall structures. Oriented plywood construction has a high wheel-carrying capacity. Hardwood plywood has excellent surface hardness, and damage- and wear-resistance. Tropical plywood

2262-460: Is managed primarily for the production of wood and non-wood forest products. In addition, 749,000,000 ha (1.85 × 10 acres) is designated for multiple use, which often includes production. Combustion of wood is linked to the production of micro-environmental pollutants, as carbon dioxide (CO 2 ), carbon monoxide (CO) (an invisible gas able to provoke irreversible saturation of blood's hemoglobine ), as well as nanoparticles . Charcoal

2349-564: Is manufactured to a number of specifications including those outlined since 1931 in the Germanischer Lloyd Rules for Surveying and Testing of Plywood for Aircraft and MIL-P-607, the latter of which calls for shear testing after immersion in boiling water for three hours to verify the adhesive qualities between the plies meets specifications. Aircraft grade plywood is made from three or more plies of birch, as thin as 0.40 millimetres ( 1 ⁄ 64  in) thick in total, and

2436-539: Is pressed against the log during rotation, to create a "gap" for veneer to pass through between the knife and the nosebar. The nosebar partly compresses the wood as it is peeled; it controls vibration of the peeling knife; and assists in keeping the veneer being peeled to an accurate thickness. In this way the log is peeled into sheets of veneer, which are then cut to the desired oversize dimensions, to allow it to shrink (depending on wood species) when dried. The sheets are then patched, graded, glued together and then baked in

2523-599: Is relatively light in weight, because its specific weight is less than 500 kg/m , this is an advantage, when compared against 2,000–2,500 kg/m for reinforced concrete or 7,800 kg/m for steel. Wood is strong, because the efficiency of wood for structural purposes has qualities that are similar to steel. Wood is used to build bridges (as the Magere bridge in Amsterdam), as well as water and air mills, and microhydro generators for electricity. Hardwood

2610-412: Is the industry concerned with forestry , logging , timber trade , and the production of primary forest products and wood products (e.g. furniture) and secondary products like wood pulp for the pulp and paper industry . Some of the largest producers are also among the biggest owners of forest . The wood industry has historically been and continues to be an important sector in many economies. In

2697-465: Is the dark grey residue consisting of impure carbon obtained by removing water and other volatile constituents from animal and vegetation substances. Charcoal is usually produced by slow pyrolysis , the heating of wood or other substances in the absence of oxygen . Charcoal can then be used as a fuel with a higher combustion temperature. Wood gas generator (gasogen): is a bulky and heavy device (but technically simple) that transforms burning wood in

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2784-736: Is the harvest, transportation, purchase, or sale of timber in violation of laws . The harvesting procedure itself may be illegal, including using corrupt means to gain access to forests; extraction without permission, or from a protected area; the cutting down of protected species ; or the extraction of timber in excess of agreed limits. Illegal logging is a driving force for a number of environmental issues such as deforestation , soil erosion and biodiversity loss which can drive larger-scale environmental crises such as climate change and other forms of environmental degradation . Illegality may also occur during transport, such as illegal processing and export (through fraudulent declaration to customs );

2871-747: Is the main producer of wood and wooden items destined to the US, the biggest consumer of wood and its byproducts in the world. The water systems of the Great Lakes , Erie Canal , Hudson River and Saint Lawrence Seaway to the east coast and the Mississippi River to the central plains and Louisiana allows transportation of logs at very low costs. On the west coast , the basin of the Columbia River has plenty of forests with excellent timber. The agency Canada Wood Council calculates that in

2958-437: Is the most important species for tree plantations, is used for several purposes as plywood manufacture, packing boxes, paper, matches , etc. It needs good quality grounds with good drainage, but can be used to protect the cultivations if disposed in windbreak lines. More than 70% of Italian poplar cultivations are located in the pianura Padana . Constantly the extension of the cultivation is being reduced, from 650 km in

3045-491: Is the world leader in sustainable forest management practices. Only 120,000,000 hectares (1,200,000 km ; 463,320 sq mi) (28% of Canadian forests) are currently managed for timber production while an estimated 32,000,000 hectares (320,000 km ; 123,550 sq mi) are protected from harvesting by the current legislation. The Canadian timber industry has led to environmental conflict with Indigenous people protecting their land from logging. For example,

3132-630: Is today the most used wood product. The wood economy was the starting point of the civilizations worldwide, since eras preceding the Paleolithic and the Neolithic . It necessarily preceded ages of metals by many millennia, as the melting of metals was possible only through the discovery of techniques to light fire (usually obtained by the scraping of two very dry wooden rods) and the building of many simple machines and rudimentary tools, as canes, club handles, bows , arrows , lances . One of

3219-518: Is transported by sea on timber carriers, subject to the IMO TDC Code . As of 2019, the top timberland owners in the US were structured as real-estate investment trusts and include: In 2008 the largest lumber and wood producers in the US were As these companies are often publicly traded, their ultimate owners are a diversified group of investors. There are also timber-oriented real-estate investment trusts . According to sawmilldatabase,

3306-530: Is typically used for construction and industrial purposes. The most common dimension is 1.2 by 2.4 metres (3 ft 11 in × 7 ft 10 in) or the slightly larger imperial dimension of 4 feet × 8 feet. Plies vary in thickness from 1.4 mm to 4.3 mm. The number of plies—which is always odd—depends on the thickness and grade of the sheet. Roofing can use the thinner 16-millimetre ( 5 ⁄ 8  in) plywood. Subfloors are at least 19 millimetres ( 3 ⁄ 4  in) thick,

3393-676: Is used as a material in wooden houses, and other structures with a broad range of dimensions. In traditional homes wood is preferred for ceilings, doors , floorings and windows . Wooden frames were traditionally used for home ceilings, but they risk collapse during fires. The development of energy efficient houses including the " passive house " has revamped the importance of wood in construction, because wood provides acoustic and thermal insulation , with much better results than concrete. In Japan, ancient buildings, of relatively high elevation, like pagodas , historically had shown to be able to resist earthquakes of high intensity , thanks to

3480-438: Is very commonly used. Aircraft plywood is available in thicknesses of 1 ⁄ 8 inch (3 mm) (3-ply construction) and upwards; typically aircraft plywood uses veneers of 0.5 mm (approx 1/64 in) thickness although much thinner veneers such as 0.1 mm are also used in construction of some of the thinner panels. Grading rules differ according to the country of origin. The most popular standards are

3567-467: Is white oak. Plywood Plywood is a composite material manufactured from thin layers, or "plies", of wood veneer that have been stacked and glued together. It is an engineered wood from the family of manufactured boards, which include plywood, medium-density fibreboard (MDF), oriented strand board (OSB), and particle board (or chipboard). All plywoods bind resin and wood fibre sheets ( cellulose cells are long, strong and thin) to form

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3654-495: The 2022 Swedish general election sourced from SVT 's election platform, in turn taken from SCB official statistics. In total there were 10,500 residents, including 8,044 Swedish citizens of voting age. 44.1% voted for the left coalition and 55.0% for the right coalition. Indicators are in percentage points except population totals and income. Forest industry The wood industry or timber industry (sometimes lumber industry -- when referring mainly to sawed boards)

3741-608: The Asubpeeschoseewagong First Nation set up the Grassy Narrows road blockade for twenty years beginning in 2002 to prevent clearcutting of their land. Wood obtained from Nigeria's wood industry undergoes processing in various wood processing sectors, including furniture manufacturing, sawmill operations, plywood mills, pulp and paper facilities, and particleboard mills. Poplar : in Italy

3828-436: The avoidance of taxes and other charges, and fraudulent certification. These acts are often referred to as "wood laundering". The existence of a wood economy , or more broadly, a forest economy (in many countries a bamboo economy predominates), is a prominent matter in many developing countries as well as in many other nations with a temperate climate and especially in those with low temperatures . These are generally

3915-429: The third world , but this amount can only be estimated, with wide margins of uncertainty. In 1998, the worldwide production of "Roundwood" (officially counted wood not used as firewood), was about 1,500,000,000 cubic metres (2.0 × 10  cu yd), amounting to around 45% of the wood cultivated in the world. Cut logs and branches destined to become elements for building construction accounted for approximately 55% of

4002-478: The 1960s, imported species of pine tree and eucalyptus have been grown mostly for the plywood and paper pulp industries . Currently high-level research is being conducted, to apply the enzymes of sugar cane fermentation to cellulose in wood, to obtain methanol , but the cost is much higher when compared with ethanol derived from corn costs. There is a close relation in the forestry economy between these countries; they have many tree genera in common, and Canada

4089-492: The 1980s to current 350 km . The yield of poplars is about 1,500 t/km of wood every year. The production from poplars is around 45–50% of the total Italian wood production. In Sweden, Finland and to an extent Norway, much of the land area is forested, and the pulp and paper industry is one of the most significant industrial sectors. Chemical pulping produces an excess of energy, since the organic matter in black liquor , mostly lignin and hemicellulose breakdown products,

4176-539: The British Standard (BS) and the American Standard (ASTM). Joyce (1970), however, list some general indication of grading rules: Plywood is used in many applications that need high-quality, high-strength sheet material. Quality in this context means resistance to cracking, breaking, shrinkage, twisting and warping. Exterior glued plywood is suitable for outdoor use, but because moisture affects

4263-538: The Endorsement of Forest Certification (PEFC) Forest Stewardship Council (FSC), Leadership in Energy and Environmental Design (LEED), Sustainable Forestry Initiative (SFI), and Greenguard are all certification programs that ensure that production and construction practices are sustainable. Many of these programs offer tax benefits to both the manufacturer and the end user. The most commonly used thickness range

4350-608: The UK, Japan, United States, Taiwan, Korea, Dubai, and other countries worldwide. It is used for construction purposes in many regions due to its low cost. However, many countries' forests have been over-harvested, including the Philippines, Malaysia and Indonesia, largely due to the demand for plywood production and export. High-strength plywood, also known as aircraft plywood, is made from mahogany, spruce and/or birch using adhesives with an increased resistance to heat and humidity. It

4437-526: The ancient Greek verb πλέκω . The ancient Egyptians and Greeks cut wood thinly and glued it together in layers with the grain in perpendicular directions as fine wood was in short supply. This is believed to have been done purely for cosmetic and economical purposes but it turned out to be a great alternative to pure wood as it reduced flex, making it a versatile building material. In 1797 Samuel Bentham applied for patents covering several machines to produce veneers. In his patent applications, he described

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4524-447: The chance of trapping water in the plywood and hence providing a solid and stable glue bond. It uses an exterior Weather and Boil Proof (WBP) glue similar to most exterior plywoods. Marine plywood can be graded as being compliant with BS 1088 , which is a British Standard for marine plywood and IS:710 is Bureau of Indian Standards (BIS) for marine grade plywood. There are few international standards for grading marine plywood and most of

4611-574: The concept of laminating several layers of veneer with glue to form a thicker piece – the first description of what we now call plywood. Bentham was a British naval engineer with many shipbuilding inventions to his credit. Veneers at the time of Bentham were flat sawn , rift sawn or quarter sawn ; i.e. cut along or across the log manually in different angles to the grain and thus limited in width and length. About fifty years later Immanuel Nobel , father of Alfred Nobel , realized that several thinner layers of wood bonded together would be stronger than

4698-411: The construction of much more safe houses in seismic areas. One of the most enduring materials is the lumber from virginian southern live oak and white oak , specially live oak is 60% stronger than white oak and more resistant to moisture. As an example, the main component in the structure of battle ship USS  Constitution , the world's oldest commissioned naval vessel afloat (launched in 1797)

4785-446: The countries with greater forested areas so conditions allow for development of local forestry to harvest wood for local uses. The uses of wood in furniture, buildings, bridges, and as a source of energy are widely known. Additionally, wood from trees and bushes , can be used in a variety of products, such as wood pulp , cellulose in paper, celluloid in early photographic film, cellophane , and rayon (a substitute for silk). At

4872-434: The distinction between softwood and hardwood . While softwood primarily goes into the production of wood fuel and pulp and paper, hardwood is used mainly for furniture, floors , etc.. Both types can be of use for building and (residential) construction purposes (e.g. log houses , log cabins , timber framing ). Lumber and wood products, including timber for framing , plywood , and woodworking , are created in

4959-692: The dominant product of forests , is used for many purposes, such as wood fuel (e.g. in form of firewood or charcoal ) or the finished structural materials used for the construction of buildings , or as a raw material, in the form of wood pulp , that is used in the production of paper . All other non-wood products derived from forest resources, comprising a broad variety of other forest products, are collectively described as non-timber forest products (NTFP). Non-timber forest products are viewed to have fewer negative effects on forest ecosystem when providing income sources for local community. Globally, about 1,150,000,000 ha (2.8 × 10 acres) of forest

5046-450: The end of their normal usage, wood products can be burnt to obtain thermal energy or can be used as a fertilizer . The potential environmental damage that a wood economy could occasion include a reduction of biodiversity due to monoculture forestry (the intensive cultivation of very few trees types); and CO 2 emissions. However, forests can aid in the reduction of atmospheric carbon dioxide and thus limit climate change . Paper

5133-620: The forestry and logging industry can be reduced by enclosing engines and heavy equipment, installing mufflers and silencers, and performing routine maintenance on equipment. Noise exposures can also be reduced through the hierarchy of hazard controls where removal or replacement of noisy equipment serves as the best method of noise reduction. The Bureau of Labor Statistics (BLS) has found that fatalities of forestry and logging workers have increased from 2013 to 2016, up from 81 to 106 per year. In 2016, there were 3.6 cases of injury and illness per 100 workers within this industry. Illegal logging

5220-412: The form of an alcoholic solution or powder, which, however, did not provide sufficient accuracy of application. Around 1930 a dry process of gluing veneers to plywood with phenolic resin in form of a film has begun to spread in the production of waterproof plywood. A typical plywood panel has face veneers of a higher grade than the core veneers. The principal function of the core layers is to increase

5307-486: The greatest area of forest in Russia. By 2001 the rainforest areas of Brazil were reduced by a fifth (respect of 1970), to around 4,000,000 km ; the ground cleared was mainly destined for cattle pasture —Brazil is the world's largest exporter of beef with almost 200,000,000 head of cattle. The booming Brazilian ethanol economy based upon sugar cane cultivation, is likewise reducing forests area. Canadian forest

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5394-469: The less expensive urea-formaldehyde glue, which has limited water resistance, while outdoor and marine-grade plywood are designed to withstand moisture, and use a water-resistant resorcinol-formaldehyde or phenol-formaldehyde glue to prevent delamination and to retain strength in high humidity . The adhesives used in plywood have become a point of concern. Both urea formaldehyde and phenol formaldehyde are carcinogenic in very high concentrations. As

5481-557: The modern era, timber is dried in kilns . When the first steam railway in Australia opened in Melbourne in 1854, timber transportation changed dramatically. Trains made the transportation of lumber quicker and more affordable, making it possible for the Australian sawmill industry to move inland. Wood is transported by a variety of methods, typically by road vehicle and log driving over shorter distances. For longer journeys, wood

5568-486: The most ancient handmade articles ever found is a polished wooden spear tip ( Clacton Spear ) 250,000 years old (third interglacial period), that was buried under sediments in England, at Clacton-on-Sea . The main source of the lumber used in the world is forests, which can be classified as virgin , semivirgin and plantations . Much timber is removed for firewood by local populations in many countries, especially in

5655-547: The narrow sense of the terms, wood, forest, forestry and timber/lumber industry appear to point to different sectors, in the industrialized, internationalized world, there is a tendency toward huge integrated businesses that cover the complete spectrum from silviculture and forestry in private primary or secondary forests or plantations via the logging process up to wood processing and trading and transport (e.g. timber rafting , forest railways , logging roads ). Processing and products differs especially with regard to

5742-461: The original material was not strictly plywood, but a single sheet of veneer. Marine plywood is manufactured from durable face and core veneers, with few defects so it performs longer in both humid and wet conditions and resists delaminating and fungal attack. Its construction is such that it can be used in environments where it is exposed to moisture for long periods. Each wood veneer will be from tropical hardwoods and have negligible core gap, limiting

5829-595: The overall industry sector had a prevalence of hearing loss lower than the overall prevalence of noise-exposed industries (15% v. 19%), workers within forestry and logging exceeded 21%. Thirty-six percent of workers within forest nurseries and gathering of forest products, a sub-sector within forestry and logging, experienced hearing loss, the most of any AFFH sub-sector. Workers within forest nurseries and gathering of forest products are tasked with growing trees for reforestation and gathering products such as rhizomes and barks. Comparatively, non-noise-exposed workers have only

5916-445: The separation between the outer layers where the bending stresses are highest, thus increasing the panel's resistance to bending . As a result, thicker panels can span greater distances under the same loads. In bending, the maximum stress occurs in the outermost layers, one in tension , the other in compression . Bending stress decreases from the maximum at the face layers to nearly zero at the central layer. Shear stress , by contrast,

6003-548: The sheet, or cross grain. Wiggle board is often glued together in two layers once it is formed into the desired curve, so that the final shape will be stiff and resist movement. Often, decorative wood veneers are added as a surface layer. In the United Kingdom single-ply sheets of veneer were used to make stove pipe hats in Victorian times, so flexible modern plywood is sometimes known there as "hatters ply", although

6090-421: The standards are voluntary. Some marine plywood has a Lloyd's of London stamp that certifies it to be BS 1088 compliant. Some plywood is also labeled based on the wood used to manufacture it. Examples of this are Okoumé or Meranti . In the UK, one can find builders' merchants advertising a grade of ply as "marine ply" that does not conform to BS 1088 - generally online adverts for these products will include

6177-410: The strength of the panel consistent across all directions. There is usually an odd number of plies, so that the sheet is balanced, that is, the surface layers have their grains set parallel to one another. This balance reduces warping. Because plywood is bonded with grains running against one another and with an odd number of composite parts, it has high stiffness perpendicular to the grain direction of

6264-501: The strength of wood, optimal performance is achieved where the moisture content remains relatively low. Subzero conditions do not affect the dimensional or strength properties of plywood, making some special applications possible. Plywood is also used as an engineering material for stressed-skin applications. It has been used for marine and aviation applications since WWII. Most notable is the British de Havilland Mosquito bomber, with

6351-420: The successive day. Paradoxically in summer oxygen created by photosynthesis in forests near to cities and urban parks, interacts with urban air pollution (from cars, etc.) and is transformed by solar beams in ozone (molecule of three oxygen atoms), that while in high atmosphere constitutes a filter against ultraviolet beams, in the low atmosphere is a pollutant, able to provoke respiratory disturbances. In

6438-453: The surface ply. Smaller, thinner, and lower-quality plywoods may only have their plies (layers) arranged at right angles to each other. Some better-quality plywood products by design have five plies in steps of 45 degrees (0, 45, 90, 135, and 180 degrees), giving strength in multiple axes. The word ply derives from the French verb plier , "to fold", from the Latin verb plico , from

6525-404: The thickness depending on the distance between floor joists . Plywood for flooring applications is often tongue and groove (T&G); This prevents one board from moving up or down relative to its neighbor, providing a solid-feeling floor when the joints do not lie over joists. T&G plywood is usually found in the 13-to-25-millimetre ( 1 ⁄ 2 to 1 in) range. Hardwood plywood

6612-443: The top smooth surface over bent curves to create transition that can simulate the shapes of ocean waves. Typical end uses of spruce plywood are: There are coating solutions available that mask the prominent grain structure of spruce plywood. For these coated plywoods there are some end uses where reasonable strength is needed but the lightness of spruce is a benefit, e.g.: Phenolic resin film coated (Film Faced) hardwood plywood

6699-466: The traditional building techniques, employing elastic joints , and to the excellent ability of wooden frames to elastically deform and absorb severe accelerations and compressive shocks. In 2006, Italian scientists from CNR patented a building system that they called " SOFIE ", a seven-storey wooden building, 24 meters high, built by the "Istituto per la valorizzazione del legno e delle specie arboree" (Ivalsa) of San Michele all'Adige . In 2007 it

6786-633: The wood industry from the trunks and branches of trees through several processes, commencing with the selection of appropriate logging sites and concluding with the milling and treatment processes of the harvested material. In order to determine which logging sites and milling sites are responsibly producing environmental, social and economic benefits, they must be certified under the Forests For All Forever (FCS) Certification that ensures these qualities. Mature trees are harvested from, both, plantations and native forests. Trees harvested at

6873-634: The wood removed from forests in log form and used for purposes other than fuel. Wood manufacturing residues, such as sawdust and chippings, are collectively known as "pulp". The United States industrial production index hit a 13-year high during the COVID-19 pandemic, according to a report from the Board of Governors of the Federal Reserve System. Originally, trees were felled from native forests using axes and hand-held cross-cut saws –

6960-602: The world top producers of sawn wood in 2007 were: Workers within the forestry and logging industry sub-sector fall within the agriculture, forestry, fishing, and hunting (AFFH) industry sector as characterized by the North American Industry Classification System (NAICS). The National Institute for Occupational Safety and Health (NIOSH) has taken a closer look at the AFFH industry's noise exposures and prevalence of hearing loss. While

7047-413: The world's industrial wood production . 25% became wood pulp (including wood powder and broccoli) mainly destined for the production of paper and paperboard , and approximately 20% became panels in plywood and valuable wood for furniture and objects of common use (FAO 1998). The World's largest producer and consumer of officially accounted wood are the United States, although the country that possesses

7134-519: The year 2005 in Canada, the forest sector employed 930,000 workers (1 job in every 17), making around $ 108 billion of value in goods and services. For many years products derived from trees in Canadian forests had been the most important export items of the country. In 2011, exports around the world totaled some $ 64.3 billion – the single largest contributor to Canadian trade balance. Canada

7221-746: Was an established process in France in the 1860s. Plywood was introduced into the United States in 1865 and industrial production there started shortly after. In 1928, the first standard-sized 4 ft by 8 ft (1.22 m by 2.44 m) plywood sheets were introduced in the United States for use as a general building material. Artists use plywood as a support for easel paintings to replace traditional canvas or cardboard. Ready-made artist boards for oil painting in three-layered plywood (3-ply) were produced and sold in New York as early as 1880. There were experiments with gluing plywood with phenolic resins, mostly in

7308-490: Was formed in two separate mirror-image halves, using curved moulds. Structural aircraft-grade plywood is most commonly manufactured from African mahogany, spruce or birch veneers that are bonded together in a hot press over hardwood cores of basswood or poplar or from European Birch veneers throughout. Basswood is another type of aviation-grade plywood that is lighter and more flexible than mahogany and birch plywood but has slightly less structural strength. Aviation-grade plywood

7395-532: Was reduced by almost 30% to 3,101,340 km over the same period. Regarding the problem of climate change, it is known that burning forests increase CO 2 in the atmosphere, while intact virgin forest or plantations act as sinks for CO 2 , for these reasons wood economy fights greenhouse effect . The amount of CO 2 absorbed depends on the type of trees, lands and the climate of the place where trees naturally grow or are planted. Moreover, by night plants do not photosynthesize , and produce CO 2 , eliminated

7482-610: Was tested with the hardest Japanese antiseismic test for civil structures: the simulation of Kobe's earthquake (7.2 Richter scale ), with the building placed over an enormous oscillating platform belonging to the NIED-Institute, located in Tsukuba science park, near the city of Miki in Japan. This Italian project, employed very thin and flexible panels in glued laminated timber , and according to CNR researchers could lead to

7569-439: Was used in the construction of air assault gliders during World War II and also several fighter aircraft , most notably the multi-role British Mosquito . Nicknamed "The Wooden Wonder", plywood was used for the wing surfaces, and also flat sections such as bulkheads and the webs of the wing spars. The fuselage had exceptional rigidity from the bonded ply-balsa-ply 'sandwich' of its monocoque shell; elliptical in cross-section, it

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