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单词 composition board
释义

composition board


Thesaurus
Noun1.composition board - a stiff moderately thick papercomposition board - a stiff moderately thick paper cardboardbinder board, binder's board - a cardboard used by bookbinders to make covers for bookscard - thin cardboard, usually rectangularcorrugated board, corrugated cardboard - cardboard with corrugations (can be glued to flat cardboard on one or both sides)paperboard, poster board, posterboard - a cardboard suitable for making posterspasteboard - stiff cardboard made by pasting together layers of paperstrawboard - a coarse yellow cardboard made of straw pulppaper - a material made of cellulose pulp derived mainly from wood or rags or certain grassespacking, packing material, wadding - any material used especially to protect something

composition board


composition board,

wood product produced in the form of a board or sheet, formed of cellulose fibers or particles derived from wood or other sources, and used principally as a building material. The oldest type of composition board is a relatively dense material known as hardboard, discovered accidentally in 1924 by the American scientist William Mason. After obtaining wood fibers by using high-pressure steam, Mason attempted to dry a matlike mass of them in a steam press. Because of a faulty valve, the press remained hot longer than had been planned and thus the first piece of hardboard was formed. In other forms of composition board the fibers are not as closely packed, and the density is correspondingly lower. Some of these boards find application as insulating and soundproofing materials. Other similar types are treated with waterproofing material, e.g., asphalt applied under pressure, and are usable as the sheathing of buildings. Such materials typically have a resistance to shearing forces exceeding that of plywood. Particle board, another form of composition board, is made by binding wood particles ranging in size from flakes to sawdust together with a suitable adhesive, such as a plastic resin, and pressing or extruding them to form sheets. Particle board is used as a cheaper substitute for plywood in some applications; but even though it has a higher density, it is less resistant to puncture and the effects of weather. When properly veneered it is suitable for making furniture. In its raw form it makes an excellent subflooring for dry locations.

Composition board

A building board fabricated of wood fibers in a binder, compressed under pressure at an elevated temperature.

composition board

[‚käm·pə′zish·ən ‚bȯrd] (materials) A sheet product composed of vegetable fibers mechanically or chemically formed into a pulp which is rolled and pressed. Also known as compo board.

Composition board

A wood product in which the grain structure of the original wood is drastically altered. Composition board may be divided into several types. When wood serves as the raw material for chemical processing, the resultant product may be insulation board, hardboard, or other pulp product. When the wood is broken down only by mechanical means, the resultant product is particle board. Because composition board can use waste products of established wood industries and because there is a need to find marketable uses for young trees, manufacture of composition board is one of the most rapidly developing portions of the wood industry. See Paper

Fiberboard is produced from wood chips. Synthetic resin may be added as a binder before the board is formed. After the board is formed, it may be impregnated with drying oils and heated in a kiln until the oils are completely polymerized to produce tempered board. If insulating board is required instead of hardboard, the material is less compacted, the degree of compaction being described by the specific gravity of the finished board.

When formed from wood particles that retain their woody structure, the product is termed particle board. Properties of such boards depend on the size and orientation of the particles, which may be dimensioned flakes, random-sized shavings, or splinters. After the particular type of particles are produced, they are screened to remove fines and to return oversizes for further reduction. Graded particles are dried, mixed with synthetic adhesive and other additives such as preservatives, and delivered to the board-forming machine.

Development of adhesives specifically for composition boards is extending their utilitarian value, and variety of textures is increasing their esthetic appeal. See Wood products

composition board

A building board which is fabricated of wood fibers, under pressure and at an elevated temperature, usually with a binder.

composition board


  • noun

Synonyms for composition board

noun a stiff moderately thick paper

Synonyms

  • cardboard

Related Words

  • binder board
  • binder's board
  • card
  • corrugated board
  • corrugated cardboard
  • paperboard
  • poster board
  • posterboard
  • pasteboard
  • strawboard
  • paper
  • packing
  • packing material
  • wadding
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更新时间:2025/3/16 9:59:45