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Currently the product category of flushable wipes represents one of the most dominant topics in the world of paper and nonwoven-production wipes that can be flushed down the wastewater system without adversely impacting plumbing or wastewater infrastructure and operations. Due to their convenience the request for such products is constantly growing on the part of the consumer thus increasing the production demand at the manufacturers end. In the past broader market coverage of flushable wipes was prevented only by a contradiction that was hard to resolve during both the production process and during use the web strength of the wipe has to be high enough to ensure the web stays intact. However after use the wipe needs to disintegrate as quickly and as completely as possible as shown in figure 1. Only a few products could manage this balancing act successfully using the conventional spunlace- technology based on carding and hydroentanglement. To clearly define the term of flushability for the end consumer EDANA and INDA the two leading trade associations for the nonwovens industry published the 3rd edition of their Guidelines for Assessing the Flushability of Disposable Nonwoven Products EDANA III. These guidelines clearly define the testing methods that have to be accomplished before a product can be labelled as flushable to avoid any problems with sewage clogging and further challenges during waste water FlusHABlE FIBrEs By sebastian Basel and Dr. roland scholz Kelheim Fibres Gmbh world pulppaper20 Creating flushable products squaring the circle treatment. With the introduction of the new combined process of wetlaid and hydroentanglement into the market a breakthrough in the functionality of flushable products seems to have been reached. The following article explains methods for improving parameters such as flushability web strength or softness. BAsIcs oF FlusHABIlIty Starting at the fibre level the following mechanisms play an important role in the break-up of the nonwoven and the in the dispersion of the fibres in water. Considered are fibre-fibre interactions as well as interaction between fibres or the web that consists of the fibres and turbulent water. With the introduction of the new combined process of wetlaid and hydro- entanglement into the market a breakthrough in the functionality of flushable products seems to have been reached Figure 1. Break-up of nonwoven and dispersion of fibres in water at different stages Water-Fibre- Interaction Fibre-Fibre Interaction a Friction between Fibre and Water q Inuence on water ow and friction between bre and water by total bre surface diameter exemplary here for Viloft cross-section and surface conditions b Momentum transfer collision of water and bre q Dependant on bre diameter and cross section