Abstract: The invention relates to improvements in drying webs and is applicable with particular advantage, although not limited to, a process carried out in a paper making machine; that of the application of `size` or `coating`.A web dryer (1) comprises two air bar assemblies (3,5) between which a web (7) travels, each air bar assembly (3,5) comprises a plurality of parallel and spaced apart air bars (9), each air bar (9) being elongate and arranged such that its longitudinal axis is transverse to the direction of travel (A) of the web (7), in which each of the air bar assemblies (3,5) includes at least two sets of air bar, a first set (13) comprises coanda air bars, and the second set (15) comprises jet impingement air bars.

Abstract: A cyclone heat exchanger including a plurality of arranged one above another cylone separators forming, respectively, a plurality of heat exchange stages, a first inlet for delivering raw meal to the heat exchanger, a first outlet for delivering the heated raw meal from the heat exchanger, a second inlet for delivering a hot gas to the heat exchanger, a second outlet for delivering the cooled gas from the heat exchanger, and at least one motor-driven conveyor device arranged between at least two heat exchange stages, located immediately one above the other, and defined by respective cyclone separators for transporting the raw meal between the stages.