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CNAA / Theses / 2005 / June /

Theoretical and experimental contributions concerning the intensification of walnut s crushing and separation processes

Author: Ruslan Ţărnă
Degree:doctor of engineering
Speciality: 05.18.12 - Food industry processes and equipment
Scientific adviser: Andrei Lupaşco
doctor habilitat, professor, Technical University of Moldova
Scientific council:


The thesis was presented on the 10 June, 2005
Approved by NCAA on the 22 September, 2005


crushing, separation, walnut, force, energy


There are 28 scientific publications that reflect the theoretical analysis and experimental research of the walnut crushing and separation of the kernel from the shell, that have as final goal the calculation of initial parameters for the walnut crushing and separation apparatus design.

It has been remarked that it is rational to crush the walnut between a plate and a ring, considering the following: the ratio between the walnut diameter and the ring inner diameter should be in limits of 1.15…1.3, the humidity 13…16%, and the chamfer angle on the inside of the ring – 30 degrees.

As to the separation process, it has been seen that it is rational to separate the walnut components in an electric field, with a coronary discharge, where the cross-piece is absolutely separated from the shell and kernel, while the ratio of separation the kernel from the shell is around 75%.

It is proposed: the design of the walnut crushing-separation installations and the calculation of its economical effect.