Coneplaca

Coneplaca refers to a cone-plate viscometer, a rheological instrument used to measure the viscosity and flow properties of fluids under controlled shear rates. In many languages the geometry is described as cone-plate, and the term coneplaca may appear as a concatenated form in non-English sources.

The instrument consists of a precision cone with a small apex angle that is brought into close contact with a flat plate, with a thin sample filling the gap. The cone is rotated at a controlled angular velocity, generating a nearly uniform shear rate across the sample. Viscosity is calculated from the measured torque, the rotation rate, and the known geometry of the cone and plate.

Operation and design notes: The gap between cone and plate is typically small, on the order of tens to hundreds of micrometers. Common cone angles range from about 1 to 4 degrees, and plate diameters from roughly 20 to 60 millimeters. The geometry is often truncated to reduce end effects. Many models offer temperature control and a wide range of shear rates, enabling measurements across Newtonian and non-Newtonian fluids.

Applications: Cone-plate viscometry is widely used in polymers, paints and coatings, cosmetics, food science, and suspensions. It is suitable for characterizing viscosity as a function of shear rate, including shear-thinning and yield-stress behavior, and for quality control and research.

Standards and terminology: Several standards (from organizations such as ISO and ASTM) describe cone-plate viscometry methods. The term coneplaca is commonly found in Spanish- and Portuguese-language texts, while English literature typically uses cone-plate viscometer or cone-plate geometry.

If a different meaning of coneplaca is intended, please provide context for clarification.