What is Viscosity Gauge
The viscosity Gauge is use to measure the fluid of its resistance to deformation at a given rate. For liquids, it corresponds to the informal concept of “thickness”. For example, syrup has a higher viscosity than water.
Viscous quantifies the internal frictional force between adjacent layers of fluid that are in relative motion. For instance, when a viscous fluid is force through a tube. It flows more quickly near the tube’s axis than near its walls. Experiments show that some stress .(Such as a pressure difference between the two ends of the tube.) is need to sustain the flow. This is because a force is require to overcome the friction between the layers of the fluid which are in relative motion. For a tube with a constant rate of flow, the strength of the compensating force is proportional to the fluid’s viscosity.
In general, viscosity depends on a fluid’s state, such as its temperature, pressure, and also rate of deformation. However, the dependence on some of these properties is negligible in certain cases. For example, the viscosity of a Newtonian fluid does not vary significantly with the rate of deformation. Zero viscosity .(no resistance to shear stress) is observed only at very low temperatures in super fluids. Otherwise, the second law of thermodynamics requires all fluids to have positive viscosity. A fluid that has zero viscosity is call ideal or inviscid.
Viscosity is the fluid’s property for resistance to flow or deformation. The higher the viscosity of a product the more it will resist to flow. Using or modifying it is a hot item. Paints are engineered to be non-Newtonian these days and often chemically modified. Additives react to the force that is exerted to the paint, thus making paint almost solid.
Why Should You Measure Viscosity Gauge ?
Gathering viscosity data on a material gives manufacturers the ability to predict how the material will behave in the real world. For example: if toothpaste does not have the correct viscosity. It can either be too difficult to pump out from the tube, or pump out too much.
Knowing the viscosity of a material also affects how the production and transportation processes are design.
Viscosity’ is a liquid’s resistance to flow that is measure by time and temperature, and it is paramount to how coating performs on press.
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. This will result in no coating being transfers to the sheets.
If the coating is too thin, it will leak from the coating chamber. Since presses run at incredibly high speeds, the thinner liquid will splash all over the press.
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 also too little coating due to it being watery.
Viscosity testing methods
There are a few different, widely accepted, industry standards when it comes to viscosity testing, including:
- ASTM D4287, the standard test method for determining high-shear viscosity of a sample by using a cone/plate viscometer. The technique is suitable for testing the viscosity of paints, varnishes, and related products at a rate of shear of 12,000 s−1. However, it may not give accurate results for paints or varnishes that dry very quickly.
- BS 3900-A7, a widely accepted standard method for testing liquid paints (excluding chemical tests) and determining the viscosity of paint at a high rate of shear.
- ISO 2884, a technique for determining the viscosity of paints and varnishes at a high rate of shear that measures flow time with the use of flow cups.
As always, we select our machines and viscosity testing solutions with industry standards in mind, so you can be confident when you’re picking your test and inspect machines with us.
Help choosing your viscosity test and inspect solutions
As well as being able to give you expert advice on the viscosity test and inspect solutions that will best suit your product line, we can support you at every step of the way – from selection to installation and ongoing maintenance. We also offer comprehensive training so you can make the most of your machines. Ready to find out more about out viscosity testers or gel strength testers? Just get in touch.
To find out more about our viscosity solutions for inks and coatings access our latest guidebook today.
Our Viscosity products available as follow:
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