16 ANDRITZ High-quality tissue made with
the lowest energy consumption Technology giant Andritz has been applying itself to cutting the energy costs in its through-air- dried (TAD) systems for making premium tissue products. PPL talks to three of its experts about the potential in PrimeLineTAD lines: Joseph Guadagno*, Stefano Marenco* and Paul Richards*
Pulp Paper & Logistics
Explain the Andritz TAD concept, including anything interesting about the development timeline? Paul Richards: Andritz entered the through-air-dried (TAD) tissue machine market in mid-2000, following the closure of the Beloit
Corporation. Whilst others looked to acquire the technology, Andritz focused on the experience of the personnel in an effort to further grow into the TAD market, and the US market in general. Over the next two years, a concept was
engineered and by early 2003 Andritz had its first order for a TAD machine. The Andritz PrimeLineTAD
Joseph Guadagno: “The biggest challenges for most newcomers to the TAD business are the levels of complexity of the process, compared to conventional tissue making”
July/August 2021
comprises a 2- or 3-layer headbox with dilution control that delivers the stock to a modified C-wrap twin wire former. The former is adapted to allow vacuum-assisted dewatering of the base sheet before the sheet transfers to the TAD section. At the pick-up, there is the possibility to run a speed differential to tailor the quality and sheet structure according to customer needs, before the sheet passes over the ‘shaping’ or ‘moulding’ vacuum box to lock in the sheet structure. Next, the sheet is dried over
two TAD drums in series, with up to between 75 and 90 per
The through-air dried (TAD) section of the ANDRITZ tissue pilot PrimeLineTAD plant
cent dryness depending on the needs of the customer. The TAD drum is a patented design, with a fully welded stainless steel construction that supports the TAD fabric and sheet during the drying process. The complete air handling system has been developed and engineered using CFD, computational fluid dynamics analysis, by our North American colleagues in Canada. The sheet is then transferred to
the Yankee cylinder for application of dry crepe before passing over the recently-developed and patented active air foils and being wound using the linear centre- wind assisted reel.
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