Straw Stopper with Fluorescent Indicator for Hermetic Seal Verification

The patent incorporates an indicator component containing a fluorophore that changes color from non-fluorescent to fluorescent when it contacts the liquid substance. This color change provides visual and automated detection capability for the filling state without requiring complex mechanical or electronic sensing systems. The indicator is integrated into the stopper structure, allowing simple visual inspection or automated fluorescence detection to verify proper filling and hermetic sealing.

The patent utilizes the parameter change of the fluorophore from non-fluorescent (dry state) to fluorescent (wet state) when contacting the liquid substance. This physical-chemical parameter change provides precise measurement of the moistening state. The indicator component is formulated with specific fluorophores that exhibit this property, allowing high-precision detection of filling state through simple fluorescence measurement without adding complex mechanical or electronic components to the stopper structure.

The patent merges the indicator component with the cap structure, integrating the fluorophore-containing material directly into the cap. This integration allows the verification function to be performed as part of the existing cap, eliminating the need for separate indicator devices or complex assembly steps. The fluorophore can be incorporated during cap manufacturing or applied as a coating, simplifying the overall assembly process while providing easy visual or automated verification of proper filling and hermetic sealing.