Coated paper

Coated paper is paper which has been coated by a compound or polymer to impart certain qualities to the paper, including weight, surface gloss, smoothness or reduced ink absorbency. Kaolinite, calcium carbonate, Bentonite, talc...[1] are used to coat paper for high quality printing used in packaging industry and in magazines. The chalk or china clay is bound to the paper with synthetic viscofiers, such as styrene-butadiene latexes and natural organic binders such as starch. The coating formulation may also contain chemical additives as dispersants, resins, PE: to give water resistance and wet strength to the paper,[2] or to protect against ultraviolet radiation.

Varieties

Machine-finished coated paper

Machine-finished coated paper (MFC) has a basis weight of 48–80 g/m2. They have good surface properties, high print gloss and adequate sheet stiffness. MFC papers are made of 60–85% groundwood or TMP and 15–40% chemical pulp with a total pigment content of 20–30%. The paper can be soft nip calendered or supercalendered.[3] These are often used in paperbacks.

Coated fine paper

Coated fine paper or woodfree coated paper (WFC) are mainly produced for offset printing:[4]

Standard coated fine papers
This paper quality is normally used for advertising materials, books, annual reports and high quality catalogs. Grammage ranges from 90–170 g/m2 and ISO brightness between 80–96%. The fibre furnish consists of more than 90% chemical pulp. Total pigment content are in the range 30–45%, where calcium carbonate and clay are the most common.
Low coat weight papers
These paper grades have lower coat weights than the standard WFC (3–14 g/m2/side) and the grammage and pigment content are also generally lower, 55–135 g/m2 and 20–35% respectively.
Art papers
Art papers are one of the highest quality printing papers and are used for illustrated books, calendars and brochures. The grammage varies from 100 to 230 g/m2. These papergrades are triple coated with 20 - > 40 g/m2/side and have matte or glossy finish. Higher qualities often contain cotton.

Others

Other types of paper coatings include polyethylene or polyolefin extrusion coating, silicone, and wax coating to make release liners, paper cups and photographic paper. Biopolymer coatings are available as more sustainable alternatives to common petrochemical coatings. [5]

See also

References

  1. ↑ Grades of Paper: Coated Paper
  2. ↑ Diana Twede and Susan E. M. Selke (2005). Cartons, crates and corrugated board: handbook of paper and wood packaging technology. DEStech Publications. p. 325. ISBN 978-1-932078-42-8.
  3. ↑ Paulapuro, Hannu (2000). "1". Paper and Board grades. Papermaking Science and Technology. 18. Finland: Fapet Oy. p. 35. ISBN 952-5216-18-7.
  4. ↑ Paulapuro, Hannu (2000). "1". Paper and Board grades. Papermaking Science and Technology. 18. Finland: Fapet Oy. pp. 38–39. ISBN 952-5216-18-7.
  5. ↑ Khwaldia, Khaoula; Elmira Arab-Tehrany; Stephane Desobry (2010). "Biopolymer Coatings on Paper Packaging Materials". Comprehensive Reviews in Food Science and Food Safety. 9 (1): 82–91. doi:10.1111/j.1541-4337.2009.00095.x. Retrieved 9 Mar 2015.

Further reading

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