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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. Various materials, including "Kaolinite, "calcium carbonate, "Bentonite, and "talc[1] can be 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 viscosifiers, 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.

Contents

Varieties[edit]

Machine-finished coated paper[edit]

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[edit]

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[edit]

Other types of paper coatings include "polyethylene or "polyolefin "extrusion coating, "silicone, and "wax coating to make "paper cups and "photographic paper. "Biopolymer coatings are available as more sustainable alternatives to common "petrochemical coatings like "LDPE (see "plastic-coated paper) or "mylar.[5]

Printed papers commonly have a top coat of a protective polymer to seal the print, provide scuff resistance, and sometimes gloss. Some coatings are processed by "UV curing for stability.

A "release liner is a paper (or film) sheet used to prevent a sticky surface from adhering. It is coated on one or both sides with a "release agent.

See also[edit]

References[edit]

  1. ^ "Grades of Paper". paperonweb.com. 
  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[edit]



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