The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Polymers are increasingly used in industrial applications due to their low cost of manufacturing, good mechanical properties and thermal stability, many problems related to static electricity can be caused by charges generated on the polymer surfaces. The electrostatic charge generation and charge decay on polytetrafluoroethylene (PTFE) plates was examined using two modes of charging, the tribocharging...
The ability of polymers to acquire and retain electrostatic charges is valued in designing new equipment like electrostatic separators, electret filters and powder coating devices. Several recent studies have pointed out the beneficial effect of electric charges on the lubricated contacts. The aim of this paper is to compare two physical mechanisms of electric charging of polymers: triboelectric effect...
The commercial roll-type corona-electrostatic separators, which are currently employed for the recovery of metals and plastics from mm-size granular mixtures, are inappropriate for the processing of finely-grinded wastes. The aim of the present work is to demonstrate that a belt-type corona-electrostatic separator could be an appropriate solution for the selective sorting of conductive and non-conductive...
Plate-type electrostatic separators are commonly employed for the selective sorting of conductive and non-conductive granular materials. Unfortunately, the purity of the conductive products is often compromised by the fact that the trajectories of the non-conductive granules cannot be controlled. The aim of the present work is to validate a relative simple solution to this problem: subjecting the...
Tribo-electrostatic separation of mm-size granular plastics mixtures is widely used in recycling industry. However, electrostatic separation of micronized plastics is still inefficient since the adhesion and aerodynamic forces surpass the electric force. The aim of this paper is to optimize a new separation process for mixed fine granular plastics based on a fluidized bed tribocharging system. A pair...
The aim of this work is to validate the two-stage design of an electrostatic separator for recycling of plastics from granular waste electrical and electronic equipment WEEE. This separator, which combines two different methods of tribocharging, is specially built for processing ternary mixtures of granular materials. The experiences were performed on a mixture of polyvinyl chloride (PVC), High impact...
The electric double layer is known to affect thin film lubrication. Other researchers have shown that tribocharging affects the breaking torque in a metal shaft — oil-lip seal system and that an external electric field may be employed to control this phenomenon. One main issue in all these studies is the characterization of the charging state of the bodies in contact. This is quite a difficult challenge...
This work is aimed the optimization of a new process of electrostatic separation of micronized isolating materials mixtures, with application at the recycling of waste electrical and electronic equipment (WEEE). The two highvoltage rotating-cylinder electrodes of the electrostatic separator are partly immersed in a fluidized bed containing the material to be separated. The control variables of the...
The triboelectric charging of granular materials is a complex physical phenomenon, the outcome of which is difficult to predict. The aim of this paper is to validate a numerical model of the tribocharging process taking place in vertically-vibrated beds of granular plastics. The granular dynamics is modeled with the Distinct Element Method that is commonly employed to design pneumatic conveyors or...
Robustness and capability are critical issues for the industrial application of any novel electrostatic process. The aim of the present work is double: - show how experimental design methodology can contribute to assessing the robustness of a given tribo-aerodynamic charging process; - validate a procedure for evaluating the capability of two tribo-aerodynamic chargers, with respect to the specific...
The present work was aimed for updating (optimizing) the design of the research-oriented roll-type electrostatic separator ELSEP. The new equipment has several distinctive features: (i) large variety of corona and electrostatic electrodes; (ii) reversible 100 kV, 3 mA DC high-voltage supply; (iii) variable-speed roll drive with induction motor and frequency convertor; (iv) ergonomic control panel...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.