A U.S. Patent for a “Chromatography Medium” was awarded to Puridify on December 1st, 2020. The present invention is a process for preparing a functionalised polymeric chromatography medium, which process comprises (I) providing a stack of two or more non-woven sheets stacked one on top of the other, each said sheet consisting essentially of one or more polymer nanofibres, (II) simultaneously heating and pressing the stack of sheets to fuse points of contact between the nanofibres of adjacent sheets to form a pressed and heated product, and (III) contacting the pressed and heated product of step (II) in a batchwise fashion in a plurality of batches with a respective batch reagent associated with each batch of the plurality of batches, said respective batch reagent being same or different in the plurality of batches…
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