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Die Verarbeitungsschwindung thermoplastischer Formmassen

Thea im of this thesis is to clarify the interaction during shrinkage.

Beginning with volume shrinkage, the relationship between pressure and temperature within the cavity is discussed. It can be shown that there is a decrease of volume shrinkage with increasing pressure and melt temperature. The pressure level is of great importance con-cerning the influence of mold temperature. Although many examples exhibit an increase of shrinkage with wall temperature, this statement cannot be taken as generall. The balance between pressure and temperature influences must be considered quantitatively for each parameter combination to solve that problem.

Besides the influences of processing parameters mold rigidities lead to large differences in shrinkage.

The comparison between free and fixed dimensions shows clearly that the thermodynamic course cannot characterize linear shrinkage alone, orientation, crystallisation and residual stresses must alo be considered.

Besides the process conditions the geometry of the molding and additives to the material (carbon, glass, fibers, etc.) are discussed with respect to their interaction with the shrinkage mechanisms.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Willy Hoven-Nievelstein

Willy Hoven-Nievelstein
Institut für Kunststoffverarbeitung
Rheinisch-Westfälische Technische Hochschule Aachen

Information

Free keywords: Anisotropy, Cooling Rate, Crystallisation, Holding Pressure, Melt Temperature, Mold Temperature, Mold Rigidity, Orientation, Process, Residual Stresses, Shrinkage, Thermal Expansion
Institute / chair: Fakultät Maschinenwesen der Rheinisch-Westfälischen Technischen Hochschule Aachen
Language: German
Technical consultant for expert services: Prof. Dr.-Ing. G. Menges (Betreuer), Prof. Dr.-Ing. P. R. Sahm
Publication year: 1984
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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