ORC Expert Advisory Services ORC International

  home    |    find an expert    |    request an expert    |    join our network    |    about us     expert login  
Expert Consulting and Expert Witness Services
  search tips 
Share this page:  Send to LinkedIn Send to Facebook Tweet This Email Print

 Expert  725031

Expert in Polymer and Plastic Rheology, Polymer and Plastics Processing, Plastic Molding Processes

Available for your Consulting and Expert Witness Needs

Education Work History Career AccomplishmentsPublicationsConsulting Services Expert Witness

Summary of Expertise:

Listed with other top experts in: 

Capillary rheometry has been central to his research efforts in the area of polymer rheology and processing. It has been used many times in his lab to mimic polymer extrusion of various polymers and plastic compounds. Capillary rheometry has been used in his research to analyze the slip flow of polymers, the rheology of polymers and plastics at high shear rates, to address the effects of viscous dissipation and high pressure on viscosity as well as to study polymer formability and processability.

capillary rheometer

Cold extrusion has been used to study the processing of polytetrafluoro polymer and ultra high molecular weight polyethylene in the form of paste. The fundamentals of such processes have been studied in detail and all critical issues associated with this process have been mastered in his research efforts. Preforming, degassing, cold extrusion of pastes, formability, and drying of the final product have been studied in detail. Polytetrafluoroethylene (PTFE) paste extrusion has been studied in great detail including preforming, flow, extrusion, drying and sintering. PTFE tube extrusion, wire coating have also been particularly studied. Several publication in the open literature have been produced by his group. Prof Expert is perhaps the top world's expert in the area of PTFE paste extrusion.

cold extrusion


polytetrafluoroethylene ram extrusion

The rheology and processing of fluoropolymers (several types) has been studied in capillary extrusion in order to identify the critical conditions for the onset of flow instabilities and wall slip. Typical resins studies were copolymers of tetrafluoroethylene(TFE) and hexafluoropropylene(HFP) and TFE/HFP/PAVE (perfluoro(alkyl vinyl ether) (PAVE) respectively. All flow regimes have been identified and studied in detail. Processing aids for the extrusion and processing of fluoropolymers have been identified that reduce dramatically the pressure drop along the capillary die and eliminate instabilities.

fluoropolymer processing

Plastic forming has been studied from many different points of view. These include capillary extrusion, single screw extrusion, parison formation and solidification as well as molding. In all these processes many critical issues exist that contribute to plastic forming. Polymers studied include polyethylenes, polypropylenes, fluoropolymers, PET and PVC.

plastic forming

Plastic molding has been studied in his lab for various polymers including polyethylenes, polypropylenes, fluoropolymers, PET and PVC. In rheology the most critical initial aspect is the formation of a suitable sample. Such samples are formed through compression molding. In such processes, temperature and pressure should be carefully selected as well as the cooling process to avoid detrimental effects such as frozen stresses, weld lines, micro-cracks etc.

plastic molding

Polymer extrusion is the basis for many other polymer processes. In his research the polyethylene extrusion has been studied as single-screw extrusion, twin screw extrusion and capillary extrusion. Extrusion of polyethylene blends has also been studied. A critical parameter in the extrusion of polyethylenes is the use of processing aids and in this area his group has perhaps the best expertise in the world.

polyethylene extrusion


thermoplastic extrusion


polymer extrusion

Polymer processing includes many fundamental processes such as extrusion, fiber spinning, film blowing, blow moulding, co-extrusion and injection moulding. He has recently edited a book on polymer processing and instabilities, control and understanging. He is also teaching courses and short courses on polymer processing in general and therefore he has mastered all fundamnetal issues associated with polymer processing, instabilities and processing aids. In addition he has mastered the importance of using rheological techniques to understand polymer processing.

polymer processing

Polymer Rheology is central to Prof Expert' research. In his efforts rheology is used as a tool to solve practical problems in polymer processing. In general it is difficult to understand polymer and plastic processing without understanding their rheology. Therefore it is crucial to relate polymer rheology with molecular structure and processability. This is the main philosophy to Prof Expert research. In the area of applied polymer rheology is a world's expert and has consulted with many companies including ExxonMobil, DuPont, Daikin , Chevron Phillips etc.

polymer rheology

Show Secondary and Basic Areas of Expertise

Year   Degree   Subject   Institution  
1991   PhD   Chemical Engineering   McGill University  
1988   MASc   Chemical Engineering   U of Toronto  
1984   Diploma   Chemical Engineering   Aristotlean U of Thessaloniki  

Work History:
Years   Employer   Department   Title   Responsibilities

1991 to




Chemical and Biological Engineering




Research in the area of polymer rheology and processing

Career Accomplishments:

1. President of the Canadian Society of Rheology 2004-present 2. Society of Rheology 1989-present 3. Applied Rheology Interest Group Society Plastics Engineers 1989-present 4. Polymer Processing Society 1992-present 5. Canadian Society of Chemical Engineers 1992-present 5. Society of Plastics Engineer's, member 1991-present 6. Secretary of the Hellenic Society of Rheology 2007-present


PE in Canada PE in European Union

Professional Appointments

President of the Canadian Society of Rheology Secretary of the Hellenic Society of Rheology


1. Mason Award of the Canadian Society of Rheology, CSR, 2014 2. Fellow of the Canadian Academy of Engineering, CAE, 2013 3. Best Paper Publication Award in Journal of Rheology (2009-2010), Society of Rheology 2011 4.Future Technology Award, Society of Plastic Engineers, ANTEC'2000 5. Killam Fellowship for Faculty, 1997-98 6. Best Paper in ANTEC'96 in Applied Rheology Interest Group, 1996 7. Best Paper Publication Award in Journal of Rheology (1992-93), Society of Rheology 1994

Publications and Patents Summary

He has 95 journal papers, 54 papers in proceedings, 70 presentations in conferences, 5 patents and 1 book edited in polymer processing instabilities. 90% of the publications are in the area of polymer rheology and processing

Selected Publications and Publishers  
 - Marcel Dekker  
 - Wiley and Sons  
 - Polymer Engineering Science, J Wiley and Sons  
 - Journal of Vinyl and Additive Technology  
 - Powder Technology  

Consulting Services:
Selected Consulting Examples:
  • DuPont & de Nemours Co., Wilmington, DE, USA (October 1992-2001)He was developing processing aids that help plastics processors to increase rate of production in various processes
  • Carborundum, Buffalo, NY, NY (September 1998-December 2002)He was studying the properties of Boron Nitride (a technologically important material) for potential applications to polymer processing
  • Chevron Phillips Chemicals (March 2007- current)A new technology HDPE could not be processed properly. He is studying ways to enhance processing
  • DuPont (1999-2001), Daikin (2001-2004), Solvay Solexis(2004-2006), Donaldson Co (2006-2007), Tensolite (2007)He studied the issues and difficulties associated with the paste extrusion of PTFE (an extremely important material technologically).
  • RoofRoc. BC, (May 2000-Sept. 2001)He developed a slate for roofing applications from completely recycled materials. The company now is commercially producing the slate.
Recent Client Requests:
  • Expert for consulting on Photopolymer Extruder.
  • Expert for consulting on Phase Change Materials.
  • Expert in plastic molding processes and specifically injection molding of polycarbonate.
Click the green button above to contact Expert for a free initial screening call regarding your expert consulting needs.  Expert is available for consulting to corporate, legal and government clients.  Remember, your initial screening call to speak with Expert is free.

Expert Witness:
Expert Witness Experience Summary:
1. Patent litigation between Exxon Mobil and Dow for three years (1977-1999) Law firm: Fish and Neave Signed declarations and provided continuous consulting 2. Consulting of a few hours (less than 5) on black ice formation for an accident 3. Consulting on deterioration and degradation of rubber in commercial mattresses (2 hrs) 4. Translation of declarations from English to Greek for a dispute that took place in a Greek court. 5. Expert witness (Law Firm:Faegre-Baker-Daniels) in patent dispute, W.L. Gore and Associates vs Atrium Medical Corporation (2013)
Click the green button above to contact Expert for a free initial screening call regarding expert testimony, litigation consulting and support, forensic services, or any related expert witness services.  A few litigation needs include product liability, personal injury, economic loss, intellectual property (patent, trademark, trade secret, copyright), and insurance matters.  Remember, your initial screening call to speak with Expert is free.

International Experience:
Years   Country / Region   Summary
2004 to 2006   Italy   Consultant for Solvay Solexis (Milan, Italy) Paste extrusion of PTFE at high reduction ratio dies
2005 to 2005   Greece   He was reviewing proposals submitted by Universities. Funding was coming from European Union
2001 to 2008   USA   All his academic years he is doing most of his research and consulting work with US companies.

Language Skills:
Foreign Language   Description
English   Academic and Research Career in North America since 1997.
Greek   Diploma in Chemical Engineering from Aristotlean University of Thessaloniki (Greece)

Additional Skills and Services:

1. Two daily seminars at the Law Firm Fish and Neave (NY) on technical subjects related to polymer rheology and extrusion (area of plastics) 2. Two industrial short courses 3. Over 20 seminars delivered in industry and another 20 at various Universities around the globe. 4. Consulting for many plastics companies including DuPont, Exxon Mobil, Daikin, Chevron Phillips, Avery-Dennison, Tensolite, Donaldson Co and many others


Need the right expert?  We can help!

home       find an expert       request an expert       join our network       about us

Intota is now ORC Expert Advisory Services