Plywood

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Blockboard

The rod or rods plywood (abbreviation ST or STAE ) is also known as plywood known wood material . It consists of a middle layer of wooden sticks or sticks aligned in parallel and cover or barrier veneers glued on both sides at right angles to them and is standardized in DIN 68705-2. Blockboards are - even with fluctuating climatic influences - dimensionally stable, rigid and have a high stamina . Having a bulk density of 450 kg / m³ in average, they are very light, special versions of Albasia , Fuma or balsa reach up to 150 kg / m³.

construction

For the strips in the middle layer, which are usually between 24 and 30 mm wide, the actual bars, mostly light woods such as spruce or other conifers are used, and occasionally even lighter tropical woods . In the case of stick plywood, the middle layer is formed from strips of peeled veneer up to 7 millimeters thick, which are upright to the plane of the board.

In the case of plywood, the bars are simply next to each other in the middle layer and are only glued to the face veneer. In the case of stick plywood, the sticks are also glued together. The advantages of stick plywood are higher stamina and a finer surface due to the annual rings in the middle layer .

Beech, poplar, spruce and tropical woods are common veneers, occasionally there are special versions with other, rare woods. Sliced ​​veneers with a thickness of 0.6 millimeters are usually used.

Block plywood is exclusively manufactured industrially.

History and areas of application

In the early days of serial furniture production, the blockboard was used as a flexible, extremely stable material that could be produced over a large area, and which enabled new types of constructions at low prices in furniture construction. As a material in mass production, it was replaced by other materials, but it remained in use in the production of sophisticated objects or in a craft setting as well as as a shelf.

In recent times, due to its low weight, it has found new applications in trade fair construction or in ship, vehicle or caravan construction. Use as a load-bearing component in accordance with DIN 1052 (see DIN EN 13986) is not permitted.

See also

Individual evidence

  1. ↑ plywood , in: information service wood special, 2008, p. 36.
  2. ↑ a b c d plywood , In: Informationsdienst Holz Spezial, 2008, pp. 27–28.
  3. ↑ a b plywood , In: Informationsdienst Holz Spezial, 2008, p. 15.

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