Glossary / E

Elastic strength
The ability of paper or board to resist stress acting in the plane of the sample.

Electrical insulating paper
Strong, pore–free paper, sometimes impregnated with synthetic resins, made from chemical pulp. Electrical insulating paper must neither contain fillers nor conductive contaminants (metals, coal, etc.) nor salts or acids. Cable papers, that are wound around line wires in a spiral-like fashion, are electrical insulating papers with a particularly high strength in machine direction. Electrical insulating papers also include electrolytic papers and capacitor paper.

Electrostatic precipitator
Used to clean up flue and process gases. Removes 99.5–99.8% of dust particles emitted from recovery boilers, lime kilns and bark–fired boilers.

Emulsion coating
Coating of paper with an emulsion containing plastic or resin.

Envelope paper
Envelope paper can be woodfree or wood–containing, machine glazed or calendered, white or in colour and is used for envelopes. It must be opaque, writable, and printable and must have a high folding strength.

Enzyme bleaching
Bleaching technique in which cooked and oxygen–delignified chemical pulp is treated with enzymes prior to final bleaching. Allows pulp to be bleached without chlorine chemicals.

Evaporation plant
Unit used at pulp mills to concentrate spent liquor to make it suitable for burning and chemicals recovery.

Extended cooking
Method of cooking pulp to low lignin content, thereby reducing the need for bleaching chemicals.