Air-laid paper

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Air-laid paper is a textile-like material categorized as a nonwoven fabric made from fluff pulp.[1]

Properties[edit]

Compared with normal wet-laid paper and tissue, air-laid paper is very bulky, porous and soft. It has good water absorption properties and is much stronger compared with normal tissue.

Main characteristics are:

  • Soft, does not scratch.
  • Non-linting, no dust, no static.
  • Strong, even when wet, can be rinsed and reused.
  • Clean, hygienic, can be sterilized.
  • Textile-like surface and drape.
  • Can be dyed, printed, embossed, coated and made solvent resistant.

Manufacture[edit]

Unlike the normal papermaking process, air-laid paper does not use water as the carrying medium for the fibre. Fibres are carried and formed to the structure of paper by air. The air-laid structure is isotropic.

The raw material is long fibered softwood fluff pulp in roll form. The pulp are defibrized in a hammermill. Defibration is the process of freeing the fibres from each other before entering the papermachine. Important parameters for dry defibration are shredding energy and knot content. Normally an air-laid paper consists of about 85% fibre. A binder must be applied as a spray or foam. Alternatively, additional fibres or powders can be added to the pulp which can then be activated and cured by heat.

History[edit]

The Danish inventor Karl Krøyer is considered to be the first who commercialized air-formed paper in the early 1980s.[2] Others developed different processes independently at about the same time.

Applications[edit]

References[edit]

  1. ^ Paulapuro, Hannu (2000). "4". Paper and Board grades. Papermaking Science and Technology 18. Finland: Fapet Oy. pp. 95–98. ISBN 952-5216-18-7. 
  2. ^ Nonwoven Technology Conference 2002 – Ottawa 13-16th May, retrieved 2013-02-13