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Institutional repository of Tomas Bata University Library
Institutional Repository
847 Publications
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  • Historical Review of Die Drool Phenomenon during Plastics Extrusion

    Die drool phenomenon is defined as unwanted spontaneous accumulation of extruded polymer melt on open faces of extrusion die during extrusion process. Such accumulated material builds up on the die exit and frequently or continually sticks onto the extruded product and thus damages it. Since die drool appears, extrusion process must be shut down and die exit must be manually cleaned which is time and money consuming. Although die drool is complex phenomenon and its formation mechanism is not ...

    The counterfeit components V-I characteristics difference study

    The electronic component V-I characteristics express a relationship between the current flowing via a chosen couple of pins, and the voltage applied on those pins. That voltage varies between two safe, for the component health limits, during the V-I characteristic recording. The applied voltage variation follows a certain function like sinus or ramp. The V-I characteristics of an individual component type can differ according to production technology, according to a particular manufacturer, o...

    A ring for description and control of time-delay systems

    This contribution aims a revision and extension of the ring of retarded quasipolynomial meromorphic functions (RMS) for description and control of time-delay systems (TDS). The original definition has some significant drawbacks - especially, it does not constitute a ring. Our new definition extends the usability to neutral TDS and to those with distributed delays. As first, basic algebraic notions useful for this paper are introduced. A concise overview of algebraic methods for TDS follows. T...

    Utilization of terahertz spectroscopy for optical behavior determination of recycled modified HDPE

    Little research was done to investigate possible utilization of irradiated materials after the end of their lifetime. This research paper deals with the possible utilization of irradiated high-density polyethylene (HDPEx) after its service life. Irradiated HDPE was used as filler into the virgin low-density polyethylene (LDPE). Three material combinations were investigated (powder/powder, granules/powder and granules/grit) and influence of the filler on optical behavior was measured. Terahert...

    Visualisation and analysis of polyethylene coextrusion melt flow

    Polymer melts experience complex, time variant, stress and deformation fields on their passage through fixed geometries in many conversion operations. Flow complexity is further increased in operations involving the co-joining of two or more melt streams where one confining boundary is moving and viscoelastic. Such a complex situation arises in coextrusion processes. This work covers experimental studies on polyethylene melt flows in complex coextrusion geometries with a view to understanding...
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