Wittmann LM, Kaschta J, Drummer D (2022)
Publication Type: Journal article
Publication year: 2022
Original Authors: Lisa-Maria Wittmann, Joachim Kaschta, Dietmar Drummer
Book Volume: 14
Pages Range: 3172
Issue: 15
Due to the lack of raw material and forced by political demand, an increasing percentage of postconsumer materials (PCR) shall be used in all processing methods in polymer technology. Thermoforming, as one of the oldest polymer-processing methods, has special requirements regarding the melt stability at high temperatures. Low melt stability affects the thermoforming in a negative manner, as the low stiffness leads the sheet to sag during the heating phase. In this study, two-layer sheets are used in order to improve melt stability of PCR material. The focus is placed on the influence of rheological properties on the biaxial stretching behavior of mono- and two-layer sheets in partially molted state. In order to create a stabilizing layer, two different thermoformable virgin materials with a melt flow rate (MFR) of 3 g/10 min and 6 g/10 min were chosen. The second layer consists of instable PCR materials with a MFR of 16 g/10min and 50 g/10 min. Rheological investigations, molecular characterization and biaxia tretching tests are used to show the benefit of two-layer sheets for processing PCR material under elongational stress. The results show that the use of two-layer sheets can improve the biaxial stretching properties, so that two-layer sheets can offer a significant potential in the processing of PCR materials in thermoforming.
APA:
Wittmann, L.-M., Kaschta, J., & Drummer, D. (2022). Biaxial Elongation Behavior in Partially Molted State of Two-Layer Sheets Containing Postconsumer Material. Polymers, 14, 3172. https://doi.org/10.3390/polym14153172
MLA:
Wittmann, Lisa-Maria, Joachim Kaschta, and Dietmar Drummer. "Biaxial Elongation Behavior in Partially Molted State of Two-Layer Sheets Containing Postconsumer Material." Polymers 14 (2022): 3172.
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