Description

LBN-II Falling Rod Viscometer

Product description

The falling-rod viscometer (also known as Laley viscometer) is a commonly used instrument for measuring certain rheological properties (apparent viscosity, false yield value, shortness, etc.) of non-Newtonian fluids such as printing ink (fluids whose viscosity varies with shear rate).Generally, it is considered that the results of Lalei drop bar test can describe part of the rheological properties of ink in the printing process better, which is suitable for the actual control of viscosity during the production of ink, and is often used as the technical requirements for the acceptance of both buyers and sellers.The falling-rod viscometer is designed and manufactured according to the international standards ISO12644 and ASTM D 4040-10 “Printing Technology — Determination of the Rheological Properties of Pulp Ink and Its Linking Materials by the falling-rod viscometer”, and its principle is as follows:Measuring the falling time required by the falling rod with different loads through the pores coated with the test sample, using the appropriate flow model (Carson model, Bingham model or exponential law model), applying linear regression method to obtain the apparent viscosity of the sample (the viscosity value at a certain shear rate,The apparent viscosity, sometimes referred to as Lalay viscosity, yield value, and shortness ratio (often referred to simply as shortness) obtained by the Lalay drop bar test.

LBN-II Falling Rod Viscometer

Main technical parameters