Through air drying

This method is used in the drying of tissue and nonwovens. Hot air is sucked or blown through the air permeable paper web supported by a heat resistant wire. Heat is transferred directly into the fiber network and the evaporated water is carried off Through air drying results in the highest drying rates. 

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Fialkiewicz and Szandorowski examined the penetration of Sr and Cl ions through air-dried films of a styrenated alkyd pigmented with iron oxide over the range 10-60% p.v.c. (pigment volume concentration) and found intense penetration of the strontium cations, but negligible penetration of the chloride ions. 

Douglas, W. J. M and Chen, G. (1996). Combined impingement and through air drying of paper. DRYING 96, A 14-26, Drukarnia Papaj, Poland. 

The wide range of UP resins on the market covers products which require the addition of paraffin wax through air-drying, UV-curing, amine-accelerated or flex-ibilising products to styrene-free and/or water-dispersible resins. 

The need for higher drying rates and controlled paper properties has revived the Papridryer, i.e., combined impingement and through-air drying, idea in the last decade. Recent experimental studies [53,54] reaffirmed the drying benefits, but still there is no commercial application. 

Lee, H. S. Study of the Industrial Through-Air Drying Process For Tufted Carpet, Doctoral thesis, Georgia Institute of Technology, Atalnta, GA, 2000. 

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