Material, which is a kind of paper and differing from it with a larger paper mass on the square of the square. Cardboard is produced on cardboard machines. The technology of cardboard production is paper-based and includes the following basic operations: grinding of pulp, cellulose and waste paper; low tide; pressing and drying. Single-ply and multi-ply cartons are produced from the milled pulp. For the inner layers, cheaper compositions containing fibrous materials, waste paper and some pulp are usually used; for the outer layers there is sulfate cellulose.
By designation, we distinguish cardboard packaging (for cardboard production), printing, shoe, construction, electrical insulation, etc. Printing includes cardboards used for the production of book bindings, tickets, passé part out, addresses, templates for ebbing stereotypes, etc. Cardboard properties are evaluated by the following general technical indicators: weight 1 m², thickness, humidity, as well as special requirements necessary in the production in which it is applied. For example, for polygraphic cardboard, absorbency, wettability, adhesiveness with other materials (foil, polymer films, etc.) are especially important. Cardboard used in electrical devices must have electrical insulation properties; building cardboards – have high strength, surface finish, the required thickness, providing noise insulation, etc. A number of special technical cardboards must satisfy such requirements as, for example, heat resistance, moisture resistance or, conversely, filtering ability.

Encyclopedia “Engineering”. Moscow: Rosmen. 2006.