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Plywood, Masonite and fiberboard
Plywood was the first type of engineered wood to be invented. It is made from thin sheets of wood veneer, called plies or veneers, which are stacked together with the direction of each ply's grain differing from its neighbors by 90° (cross-banding). The plies are bonded under heat and pressure with strong adhesives, usually phenol formaldehyde resin, making plywood a type of composite material. A common reason for using plywood instead of plain wood is the need for stability and plywood's resistance to change (shrink, twist or warp).
Types of plywood
A vast number of varieties of plywood exist, tailored for all manner of conditions and uses. Softwood plywood is usually made either of Douglas fir or spruce, pine, and fir, and is typically used for construction and industrial purposes. Decorative plywood is usually faced with hardwood, including red oak, birch, maple, lauan (Philippine mahogany) and a large number of other hardwoods.
Plywood meant for indoor use generally uses the less expensive phenol formaldehyde glue (which has limited water resistance), while outdoor and marine grade plywood are designed to withstand rot and use a water resistant phenol-resorcinol glue to prevent delamination and retain strength in high humidity.cultural aspects daily life of the aztec data deconstructivism digital circuits
The most common varieties of softwood plywood comes in three, five or seven plies with dimensions of 1.2 m × 2.4 m (4 feet × 8 feet). Each ply is 1/8 inch. Roofing can use the thinnest 3/8-inch plywood. Floorboards are at least 5/8-inch depending on the distance between floor joists. Plywood is often tongue and grooved for flooring applications. Two of the edges will have "grooves" notched into them to fit with the adjacent "tongue" that protrudes from the next board.Plywood production
Plywood production requires a good log, called a peeler, generally straighter and larger in diameter than that required for processing by a sawmill. The log is peeled into sheets of veneer which are then cut to the desired dimensions, dried, patched and glued together to form the plywood panel. The panel can then be patched, resized, sanded or otherwise refinished, depending on the market it was intended to be sold in.
History
Plywood has been made for thousands of years; the earliest known occurrence of plywood was in ancient Egypt around 3500 BC when wooden articles were made from sawn veneers glued together crosswise. This was originally done due to a shortage of fine wood; thin sheets of high-quality wood were glued over a substrate of lower-quality wood for cosmetic effect, with the structural benefits arising only incidentally. This manner of inventing plywood has occurred repeatedly throughout history; for example, many of the great English furniture makers such as Sheridan used veneer as a raw material.
disadvantages of analog systems dishwasher dvd player Economics electric designs emerald england gothic styles first orbital and space flights forests form and materials of expressionist architecture Modern plywood in which the veneer are cut on a rotary lathe from softwood logs is of relatively recent origin, invented by Immanuel Nobel (the father of the more-famous Alfred Nobel). The first such lathes were set up in the United States in the mid 19th century. Plywood has been one of the most ubiquitous building products for decades.Masonite is an engineered wood product formed using the Mason method (invented by William H. Mason) by taking wooden chips and blasting them into long fibers using steam and then forming it into boards. The boards are then pressed and heated to form the finished boards. No glue or other material is added. The long fibers give masonite a high bending strength, tensile strength and stability. Masonite was invented in 1924 in Laurel, Mississippi. Manufacturing started in 1929. In the 1930s and 1940s masonite was used for many things like roofing, walls, desktops, canoes, et cetera. Later, the popularity faded, but it's still used, most notably by hobbyists. Also called Marsonite, in Europe, this product is also known as Isorel.
Medium-density fibreboard (MDF or MDFB) is an engineered wood product formed by breaking down softwood into wood fibers, often in a defibrator, combining it with wax and resin, and forming panels by applying high temperature and pressure. It is a building material similar in application to plywood but made up of sawdust. It is denser than normal particleboard.Large-scale production of MDF began in the 1980s. Its name derives from the distinction in densities of fiberboard. MDF typically has a density of 600-800 kg/m³. Particle board is a low-density fiberboard and has a density of 160-450 kg/m³, while hardboard, also called high-density fiberboard, has a density of 500-1,450 kg/m³. Similar manufacturing processes are used in making all types of fiberboard.
One contentious issue is the use of formaldehyde resins and the associated health risks. Thus, other resins are being introduced. MDF is useful in many applications, particularly where particleboard was previously used. It is not useful for outdoor use because it will swell upon contact with water; nonetheless, it has better moisture tolerance than particleboard. Because MDF is fibre-based, it has a remarkably consistent structure. This quality makes it easy to machine or employ in woodworking applications. MDF is often used with melamine or wood veneers.freedmen slaves latins foreigners and women in roman society future of the car gemological characteristics geography heartwood and sapwood
MDF is a good material for cabinetry, particularly including acoustic enclosures such as loudspeakers or subwoofers due to its high sound insular properties.
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