Warp sizing is considered as the most important process of weaving preparation in the textile field. The quality of sized warp yarns is directly determined by the permeation and coating of sizing paste into/on warp yarns. However, many significant flaws of the current method of permeability and coating property of sizing paste, such as low accuracy and narrow variety adaptability for sizing agents and warp yarns, have emerged in the evaluation process. In order to eliminate the inherent flaws in the current method, the investigation chose chitosan (CS) as a representative of common sizing agents, introduced various amounts of perylene units onto molecular chains of the CS, and prepared a new functional sizing agent—fluorescent CS with different labeling degrees of perylene. Furthermore, PVA-perylene was synthesized to evaluate the permeability and coating property of PVA sizing paste. Then, three indexes to indicate the permeability and coating property of sizing paste, i.e. permeation percentage, coating percentage and integrity percentage of sizing film, were evaluated using the CS-perylene and PVA-perylene derivatives prepared. Due to the fluorescence emitted by the perylene units, the three indexes can be determined accurately and conveniently depending on only fluorescent microscope and common image processing software. The investigation efficiently solves the difficult problem of evaluating permeation and coating property of the pastes of both bio-based and petroleum-based sizing agents with appropriate degrees of labeling and has a significant guiding function on accurate determination of the quality of sized yarns.
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