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The paper industry continues to increase the consumption of recycled paper in response to ecological and economic pressure. Additionally, water circuits become increasingly closed. A major challenge is being faced by this trend due to the increase of unwanted trash in the process. This trash can to some degree be removed successfully by mechanical and chemo-mechanical means, such as screening and flotation. However, a remaining part of this trash, so-called stickies, i.e. residues from glues, adhesives and other organic constituents of the recycled stock can form agglomerates and deposits in the paper machine and cause serious problems associated with paper quality and machine runnability. Talc is often used successfully to control unwanted deposition of wood resin and wood processing derivatives in the wet end circuit of a paper mill. The effectiveness of talc to control stickies, is, however, not undisputed in the industry. This work makes an initial evaluation of this controversy by using well-defined chemical families of polymeric compounds, frequently found in stickies, in the form of aqueous suspensions, and the ability of a commercial talc to adsorb and to detackify them is evaluated. The results show that talc acts specifically depending on the chemistry of the polymer. Good performance was seen for polyacrylate, polyvinyl acetate, colophonium (resin) and styrene-butadiene, whereas adsorption was less effective in the cases of fatty acid ester and mineral oil/silicone based defoamers.

Recycling: Organic contaminants in recycled paper: a model study of the adsorbent properties of talc for idealised component suspensions