Design of dies with convergent and non-circular sections

Quantitative design of extruder dies for rubber compounds and thermoplastics requires a knowledge of the pumping performance of the extruder, for an appropriate extruder-die interaction. The dies are generally formed from a succession of convergent, circular or noncircular ducts with axial varying geometrical dimensions. The design and operation of dies of these types is then a matter of sufficient importance to justify a detailed analysis of the factors involved. [Continues.

The effect of internal mixer variables on the rheological properties and extrusion characteristics of an ethylene-propylene rubber compound

The influence that changes in mixing variables exert on the subsequent processing behaviour of rubber compounds is recognised throughout the rubber industry. In the light of this statement an investigation was set with the following objectives: (i) define this influence; (ii) correlate the rheological properties which control extrusion behaviour with the properties which represent the behaviour; (iii) determine degree of control which needs to be delivered at the internal mixer to produce a uniform feed-stock for extruders. [Continues.

New Public Management: Promote the Public Sector Modernization Through Service Quality. Current Experiences and Future Challenges

New Public Management, Service, Quality, SERVQUAL, IPA, Inland Revenue office, Greece,