RONA (Slovakia)

The growing global demand for energy, as well as the global demand for a higher share of the use of renewable energy sources, is leading to intensive development of the production of solid biofuels in the form of pellets. Biomass pelleting technology is successfully used to produce solid high-grade biofuel in the form of pellets. This biofuel is currently an important trade item in the energy markets. The development of pelleting technology also brings higher demands on pelleting machines and tools. Pressing tools are the powerful core of the entire technological line for the production of solid biofuels. The paper deals with biomass pelleting technology and describes the requirements and limits of this technology. It focuses in great detail on the pressing tools of pelleting machines. The work examines in detail the design of pressing dies and pressing rolls. The above knowledge are based on the personal experience of the authors as designers of pelleting machines and tools. The published information is of great practical importance for the development of pelleting technology and for moving forward in the design of pressing tools

Mouth rim is a tableware quality issue perceived by customer in a very sensitive way. Investigation and evaluation of importance of main technological aspects were made in order to find optimal process set up ensuring high mouth rim efficiency. Process data, light microscopy and glass rim resistance against mechanical load were applied as methods allowing analysis of rim impact strength. Planned experiments were proposed to quantify the effect of parameters like glass wall thickness, set up of cracking off, edge melting and toughening process. Influence of glass fining process causing reboil visible only by light microscopy was found as one of the most important issues. Optimal process setup was proposed in both directions (i) technological set up and (ii) statistical process control.