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Equipment Description:Cotton Linters Click here to print the FactSheet on A4 paper


Equipment Description:
Cotton Linters
Last updated: 20 December 2005
This Fact Sheet has been viewed: 5793 times.

Distribution... Pulps of this type are produced in the USA,Europe, Middle East and the Far East
   
Fibre Types... Cotton - Gossypium species (various, depends where grown)
Cotton Linters - Short, coarse fibres which adheres to the cotton boll, after removal of the very long textile fibres. There are broadly three classes: Mill Run (Longest fibre), First cut(Long fibre) and Second cut (Shorter fibre)
   
Fibre Properties... Fibre Length mm Millrun/First cut 1.6-2.0; Second cut 1.0-1.4
Fibre Coarseness µg/m Mill run /First cut 230-260; Second cut 200-250
Bauer McNett 14 mesh Screen Retention % Mill run/First cut 35-50; Second cut 1-20

   

  Typical Pulp Properties...  
Cotton linter pulps are available as ECF and TCF grades bleached to 88%+ ISO Brightness. Unrefined these pulps have a very high bulk, air permeance and opacity. On refining there is some development of Schopper Reigler wetness, but little development of strength properties. The opacity increases as refining proceeds due to the sheet closing up as the fibre shortens. The largest change on refining is a loss of air permeance.


  Typical Uses...  

Cotton fibre has a very high alpha cellulose content, which makes this pulp ideal for producing long life archival papers.
First cut cotton linters find uses in Artists Drawing papers, which must have a resistance to fading, neutrality and stability. These are heavier weight papers were the finish varies from a coarse surface for paint to a smooth surface for graphic work. First cut linters also find uses in some boards (eg. greetings cards)and Mill Run and First cut linters are used as extenders to the much longer Staple Cotton fibres, in currency papers.
Second cut linters are valued for their bulk and purity. In addition to uses in the above grades, Second cut linters are used in Fine and Security to add bulk and prestige value. For Fine papers requiring a good formation, care should be taken when selecting the linter grade to ensure that it is clear of "Fibre Knots". The latter, if present in large numbers in the pulp, can give rise to a poor formation or a "Fish Eye" problem.


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