Analysis of pellet diameter and inorganic filler influences on the polymer melting behavior in planetary roller extruders. - In: AIP conference proceedings, ISSN 1551-7616, Bd. 1914 (2017), 080001, insges. 5 S.
https://doi.org/10.1063/1.5016741
Modelling mechanical properties of glass and basalt fiber filled thermoplastics. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32), (2017), S. 1081-1085
Filaments and short fibers as fillers are one of the most common ingredients to thermoplastics modification in order to impact on mechanical properties of injection molded parts and maintain cost efficiency at minimum part weight. In this study, glass and basalt fibers are processed into a thermoplastic matrix to compare achievable mechanical property improvements as a result of fiber type, content, length and orientation in various plastic matrix materials. Fibers are processed into the thermoplastics matrix by a twin screw extruder, regranulated and then injection molded into components. Mechanical properties of these components are measured. Results of experimental studies are compared and correlated in order to derive quantitative relationships to be able to predict properties for different material combinations of glass and basalt fibers and a variety of thermoplastics. Major parameters of the model are fiber content, length and orientation as a result of processing conditions. Comparable to the CHAMIS laws, a relationship is established to predict achievable Young´s modulus and tensile strength for both types of fibers used. Based on the material model, a determination of required fiber content, length and orientation is feasible. The desired configuration of the compounded fiber filled material and its alteration in the injection molding process needs to be taken into account to assert the desired property enhancement in the injection molded part. The steps of the process are analyzed and methods to predict fiber length reduction during processing and resulting orientation are comprehended. The study will introduce ways to predict properties of fiber filled thermoplastics more accurately and thus allow comparing glass and basalt fiber effectiveness.
Molecular orientation and residual stresses impact on optical properties of plastic lenses. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32), (2017), S. 983-987
The substitution of conventional materials such as glass for optical plastics offers a high potential for the realization of complex optical systems. Large-scale production processes in combination with high-grade optical parts can be realized by using an injection molding process. The processing of these plastics parts influences the optical properties due to the fact that physical effects occur during filling and cooling of the melt. In general, the optical properties can be differentiated in inner properties (refractive index, transmittance) and outer properties (surface, dimensional accuracy). Both influence and change the light path through the optical material. This work aims to analyze the processing of plastic lenses by tracing back the processing parameters to the occurring physical effects. In comparison to experiments and simulations, the difference between calculated and analyzed optical properties is presented in detail. For this purpose, lens-shaped test specimen were processed on an injection molding machine with different processing parameters. In the simulation program MOLDEX 3D, birefringence patterns, warpage and shrinkage were analyzed and compared to the experimental data applying polariscope for residual stresses and an integrating sphere for transmittance grade. Transmittance values of the lenses between 88 and 89, 1% were accomplished for a polycarbonate lense. By taking into account the correlation between processing parameters and optical properties, a forecast of birefringence and transmittance of plastic parts is possible.
Modeling approach for the degradation mechanisms of PLA resulting from processing. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32), (2017), S. 471-475
Groove geometry and bulk material properties impacting on pressure build-up in single screw extruders. - In: 32nd Polymer Processing Society Annual Meeting 2016 (PPS-32), (2017), S. 265-269
Influence of fiber length in basalt fiber filled thermoplastics on mechanical properties. - In: Engineering for a changing world, (2017), insges. 9 S.
http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2017iwk-032:5
Influence of fiber undulation on the mechanical properties of fiber reinforced plastics. - In: Engineering for a changing world, (2017), insges. 12 S.
http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2017iwk-030:0
Processing and quality of continuous fiber reinforced thermoplastic by direct extrusion. - In: Engineering for a changing world, (2017), insges. 8 S.
http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2017iwk-017:9
Influence of flowability and MAH-content of maleated polyolefines on rheological and mechanical interaction effects of wood fillers in polyolefines. - In: Engineering for a changing world, (2017), insges. 10 S.
http://nbn-resolving.de/urn:nbn:de:gbv:ilm1-2017iwk-093:2
Influence of interparticle interaction effects on the rheological properties of low density polyethylene filled with glass beads. - In: Polymer testing, ISSN 1873-2348, Bd. 62 (2017), S. 440-446
https://doi.org/10.1016/j.polymertesting.2017.07.019