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
Deutsch
Bookmark Bookmarked

Gentle Injection Molding of Thermoplastic Polymers

Pretreatment trials and desorption measurements were conducted to gain knowledge on the removal of oxygen dissolved in the resin and to model the mass transport. For this purpose, a measuring fixture was constructed. The influences on the thermo-oxidative degradation of thermoplastic polymers during injection molding were investigated by variation of thermal, mechanical and local thermo-oxidative stress.

Removal of oxygen should be performed at high temperature and low pressure. However, one has to observe limits to avoid degradation. The mass transport in the resin can be described by Fick’s Law, applied on a spherical model using a geometrical correction factor.

Thermo-oxidative degradation occurs in the plasticating unit due to oxygen dissolved in the polymer resin as well as from the surrounding air. A linear relationship of oxygen content and thermo-oxidative degradation exists. An increase in stress by plasticating leads to an increase in thermo-oxidative degradation. However, there is an upper and lower limit depending on the material processed. The processing trials performed on different injection-molding machines revealed application potential in several fields of processing thermoplastic polymers.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Dirk Schmiederer

Dirk Schmiederer
Lehrstuhl für Kunststofftechnik
Universität Erlangen-Nürnberg

Information

Free keywords: Gentle processing, injection molding, removal of oxygen, desorption measurement, thermo-oxidative degradation, thermoplastic polymers, thermoplastics processing
Institute / chair: Technische Fakultät der Universität Erlangen-Nürnberg
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. Ernst Schmachtenberg (Betreuer), Prof. Dr.-Ing. Hans-Joachim Radusch, Prof. Dr.-Ing. Dr. h.c. Gottfried W. Ehrenstein
Publication year: 2008
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

Information about the article
Further Information

About the PhD Dissertation Data Base

WAK-Logo

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

WAK-Homepage