Viscosity meter portable#

For example, when a fluid is forced to pass through a tube, it flows faster near the axis of the tube than near its walls.įactors that influence the viscosity measurement are temperature, time, and shear stress. Viscosity is considered as a measurement of the frictional force that appears between neighboring layers of fluid that are in relative motion. For example, the viscosity of syrup is above the water. The viscosity of a liquid is a measure of its resistance to deformation at a given speed.įor liquids, viscosity corresponds to the natural concept of “thickness”. Knowing these two values and the torque enable one to find: the viscosity of the thixotropy, the adhesive force, and the viscoelasticity properties necessary for proper and successful screen printing.Viscosity is a distinctive property of fluids. When in operation, the paste is scooped into the gap between the cylinders, and slowly the pump speed becomes constant, the length of the flutes are consistent, it follows both the shear rate and shear time are constant. Due to the geometry of the two cylinders, the assembly is a type of pump. The outer cylinder has an inlet scoop and exhaust openings. The inner cylinder has spiral flutes making it resemble a screw. Malcom Viscometers takes the double cylinder method step better. The Malcom Viscometers utilizes a patented double cylinder spiral pump method. Thus with a Malcom viscometer, the user can not only measure batch to batch variation, but can also predict how the solder paste will perform on the screen printer.

By varying the rpm, one can find the shear sensitivity and thixotropic index of the solder paste, something that could not accurately be done with most other viscometers. This is due to the fact that Malcom applies a true shear force onto the solder paste, simulating the forces that act on the paste on a screen printer. Spiral Viscometers by design are able to measure not only the static viscosity of solder paste at low rpm, but it can more importantly measure the dynamic viscosity. By understanding how shear affects solder paste viscosity is critical as its understanding may help to limit printing problems. Shear is what the solder paste encounters on a screen printer. It is important to know the dynamic viscosity of a paste ii order to predict it’s printing characteristics.ĭynamic viscosity is gained by adding shear to solder paste. The dynamic viscosity, on the other hand gives the variation in the thixotropic behavior of the solder paste during the course of the screen printing process. Static viscosity is the viscosity of the solder paste as it is dispensed off of a tube or syringe onto a screen printer. They are the static viscosity and dynamic viscosity.

It is important to bear in mind that there are basically two components to solder paste viscosity measurement. In order to test that a paste has the proper thickness for optimal printing, the paste’s viscosity should be checked with an accurate and repeatable viscosity meter. A paste that is too thin (low viscosity) may lead to the filet slumping. Viscosity is important as a paste that is too thick (high viscosity) may lead to a bad print in the form of an insufficient filet. When speaking of solder paste, one parameter that is often discussed is viscosity.

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Viscosity meter portable#

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