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Water has low internal friction, and therefore, low viscosity. Water molecules easily slip past each other, making it easy to pour or spread. It describes how much internal friction there is at a molecular level.
Viscosity cup how to#
As long as your viscosity is in between 18 and 50 seconds, the application process should be trouble-free.Ĭheck out Peter Halbert’s How To video on Measure Coating Viscosity below.Viscosity, simply put, is a measurement of how much or how little a given fluid ‘flows’. It’s important to check viscosity levels because unusual levels may lead to application issues. The time it ends at is the viscosity number. Step 4: Stop the stopwatch as soon as the stream breaks for the first time. Once the cup is lifted out of the coating, start the stopwatch. Step 3: Have the stopwatch ready to start. Step 2: Fully submerge the cup into the coating. Step 1: Gently agitate the coating for 10 minutes. Remember: All readings should be made prior to the use of the coatings and should be conducted at the correct pressroom temperature prior to using the cup.
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Temperature can play a huge factor in viscosity levels. When the coating is measured at the same temperature with both cups, the Zahn cup will be approximately half of the Din cup. 77☏ is equal to 25☌, and 20☌ is equal to 68☏. NOTE: Both of these temperatures do not translate to the same thing. When using the Zahn 3 cup, the standard temperature of measuring is 20☌. When using the Din 4 cup, standard temperature for measuring is 77☏. For the Chamber Doctor Blade System, we select the 45 second viscosity. For the Two Roller System, we select the 35 second viscosity. We have two different viscosity numbers because we have a Two Roller System and a Chamber Doctor Blade System. An example of this is in Asia where our Saphira coatings are measured to meet the 60 second viscosity with a Din 4 cup. NOTE: In some cases, stating that a Din 4 cup should always have a velocity between 34-45 seconds can be misleading. If you are using a Zahn 3 cup, the viscosity typically falls in between 18-20 seconds. If you are using a Din 4 cup, the viscosity should fall between 35-45 seconds. The Zahn 3 cup is primarily used in the United States, and the Din 4 cup is used in the rest of the world. Two different cups are used to measure coating viscosity based on your location. Some of the performance issues that can be a result of not measuring your coating’s viscosity include the coating layer being invisible, uneven lay down, and too little coating due to it being watery.
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Since presses run at incredibly high speeds, the thinner liquid will splash all over the press. If the coating is too thin, it will leak from the coating chamber. This will result in no coating being transferred to the sheets. If a coating’s viscosity is too thick, the pumping system won’t be able to pump the liquid from the barrel causing the system to shut down. Viscosity is a liquid’s resistance to flow that is measured by time and temperature, and it is paramount to how coating performs on press.