Effective dryer control based on material-specific moisture content – Part 1: Material data

Drying green products is easily the most energy-intensive process step in clay brick and tile production. For the purpose of process control, it is interesting to know the distribution of moisture in the green products during drying. To this end, the measured value for the integral moisture content is coupled with a simulative calculation of the local moisture distribution. The measured value for the integral moisture is recorded with a new non-destructive measurement process to be developed, which takes shrinkage into account. With knowledge of the core moisture, drying control can be improved.

The sensor of the dielectric moisture measurement system is developed with consideration of the influence of drying shrinkage, moisture change and temperature on the permittivity. The determination of the variation of the hygro-thermal and the dielectric material properties during drying as well as their combination form the basis in this project. Part 1 focuses on an application-oriented presentation of the material properties.

Dr. Ralf Wagner, Material Research and Testing Institute at
Bauhaus University of Weimar,

Dr. Anne Tretau, Brick and Tile Research Institute Essen Regd


Related articles:

Issue 2020-5 Anne Tretau1, Ralf Wagner2, Frank Bonitz2, S. Alireza Pakdaman Shahri1

Material-specific moisture determination during brick drying

1 Introduction The objective of drying green bricks is to remove any water necessary for plastic shaping prior to ceramic firing. For this purpose, convection drying is used. Control of the dryer in...

Issue 2015-3

Measuring material moisture in the brick and tile industry

1 Introduction Most steps of the production process are decisively dependent on the moisture content of the material. For example, the moisture content of the raw material affects the water content of...

Issue 2011-6

Enhancement of the hydrostatic capillary tension in wet brick green bodies for a reduced susceptibility to cracking during drying

1 Context and problem statement After shaping, brick green bodies exist as capillary-porous solids, the pores of which are filled with water and which are enclosed by a water sheath. Capillary suction...

Issue 2013-05

Energy-saving methods of conditioning ­green brick bodies for low-temperature drying

1 Context and formulation of problem Low-temperature drying is a modified form of open-air drying with the aid of modern plant and control technology. In heavy clay production, the introduction of...

Issue 2009-05

Influence of the inner surface of drying green ceramic products on their moisture-dependent tensile strength

1 Introduction The determination of the pore size distribution by means of mercury penetration porosimetry leads as a secondary result to the specific pore surface a (total pore area) of the dry...