Chipboard


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chipboard

[′chip‚bȯrd]
(materials)
A low-density paper board made from mixed waste paper and used where strength and quality are needed.

Chipboard

 

made by hot forming of wood particles (wood shavings) with a binding agent. Urea-formaldehyde and phenol-formaldehyde resins are used as binding agents. The use of chipboard in various branches of the national economy creates a variety of demands, which accounts for the large number of types available. Chipboard is classified according to the means of forming, the structure, the type of milled wood used, the binding agent, and the facing material.

According to the means of forming, chipboard is classified as flat-formed or extruded. The former type is made with pressure applied at right angles to the plane of the board; the latter is produced by pressure applied parallel to the board. Flat-formed chipboard is produced in one, three, five, and many layers; extruded board is produced in single layers, either of continuous composition or with channels within the board. In single-ply board the size of the wood chips and the amount of binding agent are uniform throughout the entire thickness of the board; in three- and five-ply board, one or both outer layers (from each side) are made of thinner particles and with more of the binding agent than in the inner layers. Such board has a smooth surface and high strength. Chipboard is manufactured unfinished or finished (with one or two layers of shaved or planed veneer, paper impregnated with synthetic resins, or a synthetic emulsion) and in polished or unpolished form.

Chipboard is divided into groups in terms of density (depending on the means of forming and the brand): very low density (350-450 kg/m3), low density (450-650), medium (650-800), and high (700-800). The following basic dimensions (in mm) for chipboard have been established in the USSR (1970): for flat-formed board—length 2,500-3,500, width 1,220-1,750, and thickness 10-25; extruded board-length 2,500, width 1,250, and thickness 15-52.

The physical and mechanical properties of chipboard depend mainly on weight per volume, the shape and size of the wood particles, the amount and quality of the binding agent, and the structure. It is characterized by the following indexes: moisture, 8 percent; water absorption, 12-88 percent; coefficient of thermal conductivity, 0.07-0.25 watts per (m° K), or 0.06-0.22 kcal/nvhr-°C; specific heat capacity, 1.7-1.9 kilojoules per (kg-0 K), or 0.4-0.45 kcal/(kg-° C). swelling (in 24 hours), 5-30 percent in thickness; perpendicular tensile strength, 0.25-0.4 meganewtons per sq m, or 2.5-4 kilograms-force per sq cm. Chipboard is more biologically resistant than natural wood because of the presence of formalin in the binding agents. Chipboard is widely used in the furniture industry, in construction, and in other branches of the economy.

V. S. LEBEDEV

particleboard

A large class of building boards made from wood particles and a binder; usually has a density of 25 to 50 lb per cu ft (400 to 800 kg per cu m); often faced with veneer. Also See chipboard; coreboard.
References in periodicals archive ?
"And it is that commitment, from investing in the latest technology to developing the skills of our staff, that has helped increase our chipboard output from 60,000 cubic meters of chipboard back in 1984 to approximately 740,000 this year."
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The company says there has been little effect on orders, with a British sister company able to supply Hexham with chipboard.
It forced the company to shutdown chipboard production, although it carried on manufacturing other items like kitchen cupboards.
Wendy Bayly, of Avely, Essex, jumped at the chance to buy a wooden kitchen "at the same price as chipboard".
The machine has eight stock lines feeding pulp for the various plies that are combined as chipboard. The mill uses about 90% recycled paper in its furnish.
Essentially, 12 emitters had been fitted in three cassettes and this created an overlap, causing hot spots in the chipboard to be processed.
The process involves feeding the sheets of chipboard under a glue application roller and then flashing off the water from this water-based adhesive to leave the base catalyst to allow the printed paper to be stuck to the chipboard.
The fire behaviour training unit, which looks like a shipping container, was just about to be stacked up with chipboard ahead of the day's training.
Fabricated from chipboard and painted white, the humble, Nauman-like structure consisted of a couple of sawed-off swinging doors reminiscent of those on bathroom stalls or changing rooms.
Material collected in the "paper" bins will include newspaper, cardboard, magazines, office paper, brown paper bags, chipboard and phonebooks.
The pulp and paper industry now utilizes the forests of the Southeast to meet seventy percent of their demands for product and profit, supplying our nation and international clients with the materials for toilet paper and chipboard from our beautiful and diverse woodlands.