The effects of filling the core box cavity and sand compaction in processes of core production by blowing methods (blowing, shooting)
depend on several main factors. The most important are: geometrical parameters of cavity and complexity of its shape, number,
distribution and shape of blowing holes feeding sands as well as the venting of a technological cavity. Values of individual parameters are
selected according to various criteria, but mostly they should be adjusted to properties of the applied core sand.
Various methods developed by several researchers, including the authors own attempts, allow to assess core sands properties on the basis
of special technological tests projecting the process into a laboratory scale. The developed criteria defining a degree or a filling ability
factor provide a better possibility of assessing the core sand behavior during flowing and core box filling, which indicate the value and
structure of the obtained compacting decisive – after hardening – for strength and permeability. The mentioned above aspects are analyzed
– on the basis of authors’ own examinations - in the hereby paper.