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Wednesday, August 15, 2018

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


Video Air-laid paper



Properties

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.

Maps Air-laid paper



Manufacture

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.


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History

The Danish inventor Karl Krøyer is considered to be the first who commercialized air-formed paper in the early 1980s. Others developed different processes independently at about the same time. A Finnish company United Paper Mills(now UPM-Kymmene Oyj) was one of the companies developing airlaid technology in the 1980s. In the 1980s UPM formed a new company called Walkisoft Oy and also built an airlaid factory to Kotka Finland which started in 1985. Walkisoft built several plants around the world (including the worlds largest airlaid-factory in Mt Holly, NC, USA) in the following 14 years before being sold to Buckeye Technologies Inc. The Walkisoft engineering team, which was responsible for the engineering and R&D of the airlaid machines, became known as Buckeye Engineering Finland and then, from 2002, as Anpap Oy, a private owned Finnish company.


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Applications

  • Disposable diapers as part of the inner absorbent
  • Feminine hygiene
  • Industrial wipes
  • Personal care products
  • Table top
    • napkin
    • table cloth
  • Wet wipes

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References

Source of the article : Wikipedia

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