Description: HowtomeasuretheviscosityofPETwater-basedprintingink?1.Operationsteps①Holdthechronographstopwatchinonehand,andthe3#Zahnviscositycupintheotherhand,andadjustthestopwatchtothestateoftimingpreparation.②Putthecleanviscositycupintotheinktobetested,andrequirethecuptosinkintheinkasawhole.③Lifttheviscositycupup,andpressthestopwatchtostarttimingatthemomentwhentheinksurfaceisexposedatthemouthofthecup.④Visuallyobservethechangeintheviscosityoftheinkflowingoutoftheoutflowportatthebottomofthecup.Whentheinkflowingoutchangesfromacontinuousstatetoadropletshape,pressthestopwatchtostoptiming.⑤Readthecalculationtimeonthestopwatch,whichistheviscosityoftheinktobetested(time:seconds).2.Mattersneedingattention①Beforeinkviscositymeasurement,checkwhetherthereisanysolidmatteradheredorblockedintheinnerwalloftheviscositycupandtheoutflowhole.Ifitis,itmustbecleanedbeforethemeasurement.Otherwise,themeasuredviscosityisnottrue.②Whenmeasuringthedarkinkandthenmeasuringthelightink,thecupbodyinkshouldbewashed(orwiped)cleantoavoidpollutingthelightinkandcausinghuechanges.③Whenaddingsolvent,stirwhileadding,andaddslowly.Toofastwilleasilydamagetheinkstructureandcausetheinktoseparateandprecipitate.
How to measure the viscosity of PET water-based printing ink?
1. Operation steps
①Hold the chronograph stopwatch in one hand, and the 3# Zahn viscosity cup in the other hand, and adjust the stopwatch to the state of timing preparation.
②Put the clean viscosity cup into the ink to be tested, and require the cup to sink in the ink as a whole.
③Lift the viscosity cup up, and press the stopwatch to start timing at the moment when the ink surface is exposed at the mouth of the cup.
④Visually observe the change in the viscosity of the ink flowing out of the outflow port at the bottom of the cup. When the ink flowing out changes from a continuous state to a droplet shape, press the stopwatch to stop timing.
⑤Read the calculation time on the stopwatch, which is the viscosity of the ink to be tested (time: seconds).
2. Matters needing attention
①Before ink viscosity measurement, check whether there is any solid matter adhered or blocked in the inner wall of the viscosity cup and the outflow hole. If it is, it must be cleaned before the measurement. Otherwise, the measured viscosity is not true.
②When measuring the dark ink and then measuring the light ink, the cup body ink should be washed (or wiped) clean to avoid polluting the light ink and causing hue changes.
③When adding solvent, stir while adding, and add slowly. Too fast will easily damage the ink structure and cause the ink to separate and precipitate.
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