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| ldc-cpa.com | Different woods | Wood structure | Wood drying | Engineered wood | Plywood, Masonite and fiberboard | Oriented strand and Particle board |
Plywood, Masonite and fiberboard
PlywoodPlywood is a type of engineered board made from thin sheets of wood, called plies or wood veneers. The layers are glued together, each with its grain at right angles to adjacent layers for greater strength. There are usually an odd number of plies, as the symmetry makes the board less prone to warping, and the grain on the outside surfaces runs in the same direction. The plies are bonded under heat and pressure with strong adhesives, usually phenol formaldehyde resin, making plywood a type of composite material. Plywood is sometimes called the original engineered wood.The adhesives used in plywood has become a point of concern, due to the off gassing of the formaldehyde. Both urea formaldehyde and phenol formaldehyde are carcinogenic, so their use is undesirable. Many manufacturers are turning to "Greener Products" as government regulations become stronger against the use of these adhesives. |
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A common reason for using plywood instead of plain wood is its
resistance to cracking, shrinkage, twisting/warping, and its general
high degree of strength. In addition, plywood can be manufactured in
sheets far wider than the trees from which it was made. It has
replaced many dimensional lumbers on construction applications for
these reasons.FiberboardHardboard, also called high-density fiberboard, is a type of fiberboard, which is an engineered wood product. It is similar to particleboard and medium-density fiberboard, but is denser and much stronger and harder because it is made out of exploded wood fibers that have been highly compressed. Consequently, the density of hardboard is 31 lbs. or more per cubic foot and is usually about 50-65 lbs. per cubic foot. It differs from particle board in that the bonding of the wood fibers requires no additional materials, although resin is often added. Unlike particleboard, it will not split or crack. It is used in construction and furniture. Hardboard is produced in either a wet or dry process, which produce a panel called S1S or S2S respectively. The wet process leaves only one smooth side, but dry processed hardboard is smooth on both sides.History and usesA product resembling hardboard was first made in England in 1898 by hot pressing waste paper. In the 1900s, fiber building board of relatively low density was manufactured in Canada. In the early 1920s, improved methods of compressing wet wood pulp at high temperatures resulted in a higher density product.Unlike solid wood, hardboard is very homogeneous with no grain. A wood veneer can be glued onto it to give the appearance of solid wood. Other overlays include formica and vinyl. It has many uses, such as a substrate. Unlike plywood and solid wood, it has no significant structural strength.[citation needed] It is used in construction, furniture, appliances, automobiles and cabinetry, and is popular among acrylic and oil painters as a painting surface due to its economical price (though it must be coated with gesso or canvas before use). It is also used as the final layer in many skateboard ramps and the half-pipe. Tempered hardboard is hardboard that has been coated with a thin film of linseed oil and then baked; this gives it more water resistance, impact resistance, hardness, rigidity and tensile strength. An earlier tempering process involved immersing the board in linseed oil or tung oil until it was 5 to 6 percent saturated, and heating to 170° C (340° F). Tempered hardboard is used in construction siding. Perforated hardboard, also called pegboard, is tempered hardboard that has rows of ¼" holes in it, into which hooks can be placed for hanging tools. MasoniteMasonite was invented in 1924 in Laurel, Mississippi. Mass production started in 1929. In the 1930s and 1940s Masonite was used for many applications such as doors, roofing, walls, desktops, electric guitars, canoes, etc. It is still sometimes used for home siding and, if kept painted at regular intervals, it will last the life of the home. Its popularity later faded, but it is still used, most notably by hobbyistsProductionIt is formed using the Mason method, using wooden chips, blasting them into long fibers with steam and then forming them 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, density and stability. Unlike other composite wood panels produced using formaldehyde-based resins to bind fibers, Masonite is made using natural ingredients only, which makes it an environmentally friendly productUseArtists have often used it as a support for painting, and in artistic media such as linocut printing.[citation needed] Masonite's smooth surface makes it a suitable material for table tennis tables and skateboard ramps. Masonite is also popular among theater companies as an inexpensive way to resurface stage floors.[citation needed]Moving companies are large users of Masonite.[citation needed] Among other things, they use it to protect the walls of buildings they are working in, and lay it on floors to enable smooth rolling of dollies loaded with goods.[citation needed] Masonite is widely used in construction, particularly in high-end renovations where floors are finished prior to other work and require protection. Sheets of ⅛" or ¼" masonite are typically laid over rosin paper on finished floors to protect them. The masonite sheets are taped together with duct tape to prevent shifting and to keep substances from leaking through. It is also considered one of the best materials in the making of a Wobble board. It is also called Marsonite.In Europe, this product is also known as Isore |
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| ldc-cpa.com | Different woods | Wood structure | Wood drying | Engineered wood | Plywood, Masonite and fiberboard | Oriented strand and Particle board |