back to top
My wish lists
Save your wish list
If you want to add more content to your wish list, simply log in. If you do not have a user account, please register for the Hanser Customer Center.

» Do you already have a user account? Please log in here.
» Don't have a user account yet? Please register here.
Your wish lists
If you want to use your wish list during your next visit, simply log in. If you do not have a user account, please register for the Hanser Customer Center.
» Do you already have a user account? Please log in here.
» Don't have a user account yet? Please register here.

« Back

Your advantages at a glance

  • One login for all Hanser portals
  • Individual home page for faster access to preferred content
  • Exclusive access to selected content
  • Personal wish lists on all portals
  • Central management of your personal information and newsletter subscriptions

Register now
Bookmark Bookmarked

Melting in Single-screw Extruders with Grooved Plasticizing Barrel

A very promising high performance extruder which is already used in the European industry consists of a combination of a grooved plastizing cylinder with a barrier screw. The cylinder is provided with grooves both in the feed and the melting zone. Although the exceptional performance of this extruder system has already been demonstrated, the exact mechanisms during the melting process are still not fully understood. Therefore, the research of the melting process in this type of extruders is of scientific interest.

Based on the theory of melting in conventional single-screw extruders, a physical-mathematical model for the grooved plastizicing cylinder has been developed. Two important assumptions of the mathematical model are that the solid bed width corresponds to the solid channel width and that the grooves are completely filled with melt. The molten plastic is transported from the solid channel into the melt channel through the grooves. In this way, the melt film in the region between two grooves is minimized.

For the experimental investigation of the melting process in the single-screw extruder with grooved barrel (SSGB), experiments were carried out at various plasticizing units. In connection with the extrusion, trials on dynamic pressure measurements were performed at various locations along the cylinder. Subsequent analysis of the pressure signals allowed characterization of the melting process. Additionally, screw freezing experiments were per-formed for axially grooved cylinder. A solid bed was clearly identified in the solid channel, and it was also possible to identify the melt flow in the grooves. By means of these experiments, the melting process can be characterized and some of the theoretical ideas about the melting mechanism can be confirmed.

The mathematical model was compared with the results of the experimental investigations. In addition to the experimentally provided evidence of the validity of key model assumptions, the simulation results were also validated by means of experimental tests. However, the melting rate of the SSGB could not be measured directly. For this, it would be necessary to develop a measure device in the future.

Lesen Sie die deutsche Zusammenfassung auf
 José Antonio Avila Alfaro

José Antonio Avila Alfaro
Institut für Kunststofftechnik
Universität Stuttgart


Free keywords: Single-Screw Extruder, Extruder Design, Melting, Screw Design, Simulation, Melt Flow, Grooved Barrel
Institute / chair: Fakultät für Energie-, Verfahrens- und Biotechnik der Universität Stuttgart
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Christian Bonten (Betreuer), Prof. Dr.-Ing. Johannes Wortberg
Publication year: 2016
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) /

Further Information

About the PhD Dissertation Data Base


In cooperation with the Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK), we provide free access to current dissertations in the field of plastics technology.

Further information and contact