Research technology of the core nanoyarn for Filtration Application

The paper focuses on the technical application of polymeric nanofiber materials.It introduces the usage of linear nanofiber structures, e.g.nanoyarns, for producing filter candles with the capacity of water or air filtration.The research focuses on producing composite nanofibrous yarn containing a micro-fibre core covered with a nanofiber sheath prepared by the highly effective technology: electrospinning in alternating electric field (AC electrospinning).The core of the composite yarn is used to provide sufficient mechanical strength, while the nanofibrous sheath offers an additional function, e.g. for advanced filtering capacity.The filter cartridges are made using a unique winding device, enabling the production of filters of various sizes as well as with different winding parameters.At the same time, the production line is designed to eliminate any mechanical or chemical irregularities in the nanofiber sheath.The work describes the technology of production of core nanoyarn with polyester core fibres and poly-vinylbutyral nanofibrous cover wounds on filter cartridges.The filter cartridges were measured on a custom-made laboratory setup.Experimental tests of microplastic filtration with various sizes confirmed the filter efficiency for this application.Based on measurement results, filter cartridges with different structural as well as material compositions are discussed and suggested.Filters based on natural and biodegradable materials as the next step in the research of the usage of sustainable nanotechnologies are also discussed in the paper.