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This article provides an introduction to a series of publications concerning research and prediction of mechanical properties of paper cores. On the basis of available literature and results of author's tests, the measurement methods of paper cores properties were presented. Among other things, the author described, in which loads are applied bending moments and compressive forces. Also discussed the reasons why it is difficult to identify the theoretical strength of the sleeve in various states of load, indicating the possibility ot simplifying the theoretical description of the mechanical properties of the sleeve, where it is possible to treat the fibrous material as the elastic body. Source

Stepien K.,Politechnika LLodzka
Przeglad Papierniczy

The aim of the work was to perform tests of ink transfer on printing substrates in flexographic Inking unit. It shows the impact of technical and technological parameters on ink transport in the inking unit. Methods and results of measurements of printing materials properties as well as methodology olink transfer tests are presented. The research tests of ink transfer were performed with IGT F1 testing appliance and a Mark Andy laboratory flexographic printing machine. Source

The article presents the results obtained using several analytical methods. Each of the methods used were a source of additional information on the analyzed samples. This results in a more complete assessment of the suitability of packaging in terms of health security. Source

The paper presents the principle of so-called ratio methods used in the diagnosis of gases dissolved in transformer oil. An analysis of these methods showing the reasons why it is not always possible to obtain a correct diagnosis was given. The extension of the algorithms to the elements of fuzzy logic which enhance their effectiveness was proposed. Several studies of the actual defects of transformers were also included. Source

Article concerns the problem of electrical discharges developing in transformer oil under lightning impulse of both polarities. The results of experimental studies performed for two setups: HV electrode - grounded plane, of different electrical field distribution, were discussed. For both setups, two types of HV electrodes with identical outer dimensions: bare and paper insulated, were used. Source

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