Wood is an exceptionally beautiful and versatile material. The logs used in your bedroom, dining or occasional furniture may be hundreds of years old. They may have been transported thousands of miles, been bought and sold many times before being carefully cut into veneers or solid boards.
Wood has been used as a raw material for furniture making for thousands of years. More than 3000 years ago, Egyptian woodworkers used mortise and tenon joints and made wood furniture in highly developed workshops. Today, wood is the major component of furniture because of its unique characteristics.
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The character of a wood surface is the result of the color of the wood, its grain, figure and texture. These physical characteristics are determined by the interior structure of the tree (growth rings, medullary rays, branching points, knots, etc.) and the way in which the board or veneer is cut. Many people have a general idea of how color, grain, figure and texture relate to physical structures in the wood, but a more exact knowledge is helpful, for those concerned with the identification and appreciation of fine wood solids and veneers.
Wood Grain is determined by the size and orientation of the cells, which make up the tree trunk. These cells, often called fibers, support the tree and serve as conduits for nutrients and water. They generally run straight up and down the tree trunk, but can be wavy, spiraled or irregular. In softwoods such as pine, spruce, fir, cedar and redwood these cells serve dual supportive and conductive roles, but hardwoods have specialized conductive cells often called pores. In hardwoods like oak, the pores are denser and larger in the springwood (wood laid down in the spring) than the summerwood, giving the tree pronounced growth rings and a noticeable grain. Mahogany, a tropical hardwood, has even, randomly dispersed pores producing a uniform appearance - a finer grain. Maple also has a fine, close grain.
Wood Figure is the "macro" pattern or design that can be seen in the finished board or veneer. Figure is caused by different factors in individual woods such as:
There are many different "figure types" which can easily be identified. Some of these are the fiddleback figure, ribbon figure, striped figure, birds eye figure, blister figure, quilted figure, crotch figure, mottle figure and swirl figure.
Wood Texture is the "feel" of a wood surface. Woods such as oak with large, wide medullary rays (flakes), big pores and distinct annual rings are said to be course textured or uneven textured. Woods with finer rays and even growth are termed fine or even textured.
Wood boards and veneers are normally flat cut, quarter sawn or veneered.
Flat Cut Boards are made by sawing the log so that all cuts are parallel to a section straight through the middle. Each cut is made tangential to the growth rings, normally producing a series of inverted "V's" on the face of the lumber.
Quarter Cut Boards are sawed from logs that have been cut into quarters. Cuts are made into the quarters, across the growth rings into the center of the board. On the quarter sawed boards, the growth rings appear as parallel lines. Oak is often quarter cut.
Veneers are thin slices of wood that are cut or sliced from a log. These thin decorative wood slices are applied to underlying wood solids or particle-board (composition board) core material. Contrary to popular belief, high quality composition board cores can be more expensive to use and result in more stable constructions than solid wood cores. Veneering has many advantages and only a few drawbacks:
One drawback is that the use of veneers may restrict the ways in which a particular piece can be re-finished. Another drawback is that many people seem to like furniture made of a solid wood, irrespective of the advantages of veneering.
The method of cutting or slicing a log determines the figure in the finished veneer. Flat cut, rotary cut, quartered, rift-cut and half round are some of these slicing methods.
Flat Cut veneers are sliced from half a log, or flitch. A blade cuts veneers from the flitch which, like flat cut lumber, usually show an inverted "N" pattern.
Rotary Cut veneers are peeled from a log by rotating it against a blade. The veneer is removed in sheets, much like removing paper towels from the roll. A large continuous sheet is produced by this method, which often yields uninteresting patterns in the finished product. The rotary cut is often used for making plywood.
Quartered veneers are cut from logs that have been divided into 4 sections. The slices are made at roughly right angles to the growth rings into the center of the section. As in quarter sliced lumber, the growth rings appear as parallel lines in the finished veneer.
Rift Cut in oak is much like quarter sliced, except that the blade angle is not perpendicular to the growth rings. Instead it is rotated another 15 degrees so that the flake figure of quarter sliced oak is avoided.
Half Round veneers are produced by rotating half a log against a blade so that cuts are made across the growth rings - with a motion halfway between flat and rotary cut that yields a highly figured surface.
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Furniture finishes are used to enhance the beauty and durability of wood furniture ' Modern finishing methods normally use multi-step processes whereby raw woods are stained, filled, sealed and top-coated to:
The types of materials, the amount of hand labor and the number of coats of stain, filler, sealer and topcoat used to finish fine wood furniture all affect its price. Furniture can undergo anywhere from three, to 25 or more finishing steps. Two similar looking furniture pieces may differ widely in price due to relative finish quality. These differences are often subtle, and should be pointed out at retail.
Generally, wood finishes should be deep and rich, with a uniform color and a smooth, even surface. Edges should be free from drips, bubbles, runs and streaks. Wood grain and figure effects are enhanced and heightened rather than covered by quality finishes. The actual color of the natural wood often bears little resemblance to common furniture finishes. For example, maple is a very "white" wood, but the most common maple finishes are a honey color.
Also known as nitrocellulose lacquers are quick drying finishing materials, most often sprayed on furniture surfaces in multiple, thin layers. These cellulose derivatives are widely used because of their relative durability, ease of repair and crystal clarity. They are produced in various sheens and colors and may be damaged by exposure to substances such as nail polish remover, shoe polish, and alcohol. Heat from unshielded cookware, and combinations of heat and pressure can also mar wood surfaces protected with nitrocellulose lacquers. After application, lacquers are often hand rubbed, producing a very smooth, beautiful surface.
Shellac is an extract from a secretion of an insect indigenous to southern Asia. This quick drying, but delicate finish is easily damaged by moisture and heat. It was largely discarded as a commercial finishing material when modern nitrocellulose lacquers were introduced. True oriental lacquer is actually a high gloss finish composed of built up layers of shellac, not an actual nitrocellulose lacquer product. French Polish, once used to produce a beautiful, high luster shellac finish, took as long as 12 months to apply. It is no longer used commercially.
Wax Polish is one of the oldest methods of finishing furniture. Wax darkens and emphasizes the grain and can be buffed to a soft or high luster. It has several disadvantages when used alone, including its lack of resistance to heat and susceptibility to staining. Waxed finishes must also be re- applied over time. Today, wax finishes are normally not used commercially.
Varnish made from gum dissolved in linseed oil was used in ancient times. Varnish making knowledge was lost in medieval times and then re-discovered in the mid 19th century. Today, most varnishes are made of synthetic resins, which produce hard, tough, clear finishes. The term catalyzed varnish is often used to describe some superfinishes.
Synthetic finishes such as polyurethane, polyesters and polyamides are polymeric coatings that are generally tougher than conventional nitrocellulose lacquers - being more resistant to heat, moisture, chemicals and abrasion. These finishes can be shiny or matte, clear or colored. Even though they are harder to destroy than nitrocellulose lacquers, they are also more difficult to repair if damaged. Generally, the use of polyester and polyurethane lacquers are limited to the high gloss look, sometimes labeled "the lacquer look."
Hot Oil finishes usually consist of combinations of linseed oil, other oils and solvents. This finish is applied in multiple steps. It sinks into the wood, bringing out the grain and tending to darken and yellow the finished product. Oil finishes require additional oiling or waxing to maintain the finish over time. They provide moderate heat and water resistance a can be easily repaired and renewed. Oil finishes are not widely used commercially, but are simulated by applying a wiping stain, sealer and a low gloss, low sheen lacquer.
Superfinish is a catchall term applied to any finish applied to furniture that endows the surface with unusually high resistance to harmful environmental factors. Superfinishes protect wood surfaces from some or all of the following: watermarking; damage from corrosive liquids such as bleach, finger nail polish and alcohol; damage from abrasion and impact; hot marking problems. These finishes can be synthetics or have a nitrocellulose base. They are sometimes applied selectively to dining or occasional tops.
High Pressure Laminates and vinyl wrap coatings are surfacing materials that are bonded to core materials. They are not wood finishes, even though they are often made to resemble wood.
High-pressure laminates, often called "mica" impart soil, stain and wear resistance to furniture surfaces. Full laminate tops, tops inserted into wood frames or completely sheathed mica furniture, is common. Wood grain laminates should be grain and color matched to surrounding wood surfaces. They should also be free of any marks or abrasions, since these cannot be repaired.
Some simulated wood tables are made by applying a wood grained vinyl sheet or foils over particle board. The advantage of this method over engraving (see glossary) is that grained effects can be applied to curved surfaces.
Vinyl wrap surfaces may be damaged by heat and cannot be repaired if the surface is marred. Some manufacturers put a UV topcoat or glazing lacquer on these products for added protection.
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There are thousands of species of wood, and hundreds that are utilized in commercial furniture production. Described here are some that are most frequently used, and most often mentioned at retail. Woods are listed under their common names, which though inexact, refer to one or a number of related species having similar end product characteristics.
Oak is the most widely used hardwood. There are more than 60 species of oak grown in the U.S., which can be separated into two basic varieties; white and red. The red variety is also known as black oak (a reference to its bark).
There are 115 species of maple. Only 5 commercially important species grow in the U.S. These are most often called hard rock maple or sugar maple.
Mahogany, also known as Honduras mahogany is a tropical hardwood indigenous to South America, Central America and Africa. There are many different grades and species sold under this name, which vary widely in quality and price. Mahogany, which comes from the Caribbean, is thought to be the hardest, strongest and best quality; logs from Africa, though highly figured, of slightly lesser quality. Philippine mahogany, has a similar color, but is not really mahogany at all. It is a much less valuable wood, being less strong, not as durable or as beautiful when finished.
Cherry is grown in the Eastern half of the U.S. It is sometimes called fruitwood. The term fruitwood is also used to describe a light brown finish on other woods
Walnut is one of the most versatile and popular cabinet making woods. It grows in Europe, America and Asia. There are many different varieties.
Pine is a softwood that grows in most areas of the Northern Hemisphere. There are more than 100 species worldwide.
There are 16 species of ash that grow in the eastern United States. Of these, the white ash is the largest and most commercially important.
There are 15 species of hickory in the eastern United States, eight of which are commercially important.
Any of several climbing Asian palms whose stems grow to great lengths.
The American beech is a single species that grows in the eastern half of the United States.
There are many species of birch. The yellow birch is the most commercially important. European birch is fine grained, rare and expensive.
Several species of cedar grow in the southern United States, Central and South America.
Indigenous to the Pacific United States, redwood trees grow to more than 300 feet tall and 2,500 years old.
True teak is indigenous to Southeast Asia, but similar wood species also grow in Africa.
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Wood that is dried without the use of artificial heat sources such as a kiln.
"All wood" furniture can be made of wood products such as hardwood and softwood lumber, veneers, plywood, particleboard, chip core and composition board.
A finish that gives the appearance of age. This is normally accomplished by highlighting or lightening areas that (in older pieces) normally show wear and by darkening other areas to simulate age and soiling.
veneers made from trees that have knots in them. These veneers have a decorative irregular mottled pattern.
The chemical component of wood that is the structural portion of cell walls.
A crack or split in wood; often the result of drying.
A board made of chips of wood that are held together with resin and compressed into a strong, warp resistant pane. Particleboard and pressboard are other names for this type of product that is produced to meet a variety of quality specifications.
A veneer cut from the branching point of a tree. Crotch veneers can be cut, assorted and matched to produce varied patterns.
Wood that is purposely marred to give a rustic look or the appearance of great age.
A process whereby a patterned or wood grained effect is printed on top of a panel.
The top veneer layer that is seen in the finished product.
A wood pattern in woods with a wavy grain
The characteristic markings or pattern seen in wood solids or veneers. Figure can result from uneven color, growth rings, vascular rays and variations in grain.
The rings seen in a cross section of a trees' trunk. The rings are formed in both hardwoods and softwoods by the relative rate of disposition of wood in the trunk.
Wood derived from angiosperms (broad leafed trees such as oak, beech, maple, mahogany and walnut). Some hardwoods are actually softer than woods categorized as softwoods.
Wood or other materials that are set into corresponding carved out recesses, often producing a pattern.
Kiln drying reduces the moisture content of the lumber, a process which inhibits checking, splitting, and strengthens the finished product.
Layers of wood that are glued or fastened together. Strictly speaking, plywood is made from laminated veneers, but the term is usually used to describe furniture components made from relatively thick plies of wood that are glued together with the grain of each piece facing in the same direction.
Joinery or inlay that has geometric or other patterns usually made from different colored woods.
A structural wood material composed of thin sheets of wood veneer (plies) that are glued together. Adjacent layers are usually placed with the grains at right angles - giving plywood exceptional strength and resistance to warping. Some plywood is made by laminating equal numbers of veneer sheets on top of a thicker lumber core.
The radial, medullary or pith rays run outward from the center of the tree, across growth rings. They function in the living tree as horizontal food conduits and storage vessels. In some woods, like the Oak they are very pronounced in the wood, giving it an open grained texture.
Also striped figure; is common in tropical timbers, being caused by grain fibers that spiral in opposite directions in adjacent growth layers.
A veneering process where veneer is peeled with a stationary knife from a rotating log in a single continuous sheet (in paper towel fashion).
A finish which is rubbed with an abrasive and lubricant to produce a smooth, level surface that is free from lint and dirt specks, and has a reduced sheen.
The outer, living portion of a tree's wood. In many species the sapwood is lighter in color than the interior heartwood.
veneer cut by sawing lumber, a somewhat wasteful process usually reserved for cutting thicker than normal veneers.
The process of removing moisture from wood through air or kiln drying.
Veneer cut from a log or flitch by moving it against a stationary knife.
Woods from a conifer or gymnosperm (cone bearing tree with needle-like leaves) such as Pine, Spruce and fir.
This term indicates that the exposed parts of the furniture so marked, is made of hardwood or softwood lumber.
Furniture labeled "solids and veneers" can be made of hardwoods and softwoods, veneers, reconstituted wood products (particleboard, composition board, chip core), plywood, and materials such as artificial laminates.
A thin decorative layer of wood that is applied to underlying wood solids or particleboard. Veneers are used to match and balance grain, create inlay and banded effects.
Once straight wood that has become bent or crooked.
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Mother nature has given every piece of wood individual characteristics that no man made material can duplicate. No two pieces of wood will look exactly alike in color, grain pattern or texture. Each piece is unique and distinct.
All solid wood furniture will expand and contract as humidity and temperature change. Your table top, where the two halves meet, may expand or contract slightly along with changes in climate. The center leaf may do the same. There is no reason to be concerned as this is a natural occurrence for any solid wood product.
Very important when storing your leaf, the top surface must be placed face down to prevent the leaf from warping.
A premium quality finish enhances and protects the natural beauty of your wood furniture. This finish requires minimal care and maintenance.
After each use, wipe the top with a clean soft cloth. Do not allow any water rings to remain on the surface. Wipe them up immediately. Otherwise, water may soak through the finish causing the wood beneath to swell.
Occasionally, apply a good paste wax, not aerosol, to the tabletop.
Heat and water can cause damage to a surface. Do not place a hot pot, pan or any other hot object directly on the surface. This could scorch the finish and cause it to turn cloudy or brittle.
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