Extrusion International 2-2019

30 Extrusion International 2/2019 PIPE EXTRUSION – INTERVIEW or spiral distributor is needed. Right now I am concentrating on the topic of ‘rotating tools’ used for processes like the production of pipes with spiral ribbing. I also lectured on this topic at the AMI-Conference in Düs- seldorf in April. Do you manufacture the extruders and dies yourself? Dobrowsky: I don’t. In the past 10 years I have established a close network of enterprises I cooperate with. I am the expert that visits the customer, examines the problem, counsels, undertakes the entire Being Self-Employed in the Extrusion Industry for 10 Years – A Conclusion Josef Dobrowsky did not knowwhere his journey would lead himwhen he first started his own engineering office. Nowadays anything else is unimaginable for him. He is planning, developing and optimizing extrusion systems for OEMs and processors. His key competences are extrusion systems and production techniques for polyolefin pipes. Not just simple solutions but specialties. “I dare to solve complex problems that require innovative ways”, explains founder and holder of the Austrian Conextru GmbH in the interviewwith EXTRUSION Mister Dobrowsky, what are the changes the pipe extrusion industry went through in the last 10 years? Josef Dobrowsky: In general one can say that the requirements for pipes are constantly rising. Although standard pipes still find use as pres- sure or sewage pipes, the demand for special solutions gets more and more noticeable. Could you mention some examples? Dobrowsky: Special solutions come in various appearances. This can be standard pipes coated by one or multiple layers of special mate- rials or multi-layer solutions. Pipes for potable water with a protective layer to prevent the intrusion of outside carbon hydride are just one example. Another example is piping for geothermic use which has to be produced by rotating tools. Which kind of technique is required to produce pipes like that? Dobrowsky: The extruder is usu- ally a standard extruder; the tech- nical know-how shows in the pipe head. Depending on the utilization a multi-layer pipe head or a coat- ing pipe head with a special radial