Gernot Zitzenbacher
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View article: Simulation of the Melt Conveying Zone of a Single-Screw Extruder for Mixed Polymer Materials Using an Isothermal Analytical Flat Plate Model
Simulation of the Melt Conveying Zone of a Single-Screw Extruder for Mixed Polymer Materials Using an Isothermal Analytical Flat Plate Model Open
An optimized extrusion process is desired for both an environmentally friendly and economically sustainable recycling process. The aim of this study is to simulate the melt conveying zone of a single-screw extruder when using contaminated …
View article: Repeated Thermomechanical Recycling of Polypropylene-Organosheets to Injection-Moulded Glass-Fibre-Reinforced Composites
Repeated Thermomechanical Recycling of Polypropylene-Organosheets to Injection-Moulded Glass-Fibre-Reinforced Composites Open
Continuous-fibre-reinforced thermoplastics are attractive materials for industries to cut down on weight in structural components. Recycling these parts or trims generated during production is difficult due to the reduced properties in mat…
View article: Modeling Approach to Calculate the Orientation of Liquid Crystal Polymers in a Flow Channel Under Varying Boundary Conditions
Modeling Approach to Calculate the Orientation of Liquid Crystal Polymers in a Flow Channel Under Varying Boundary Conditions Open
Thermotropic liquid crystal polymers comprise rigid chain segments called mesogens. This study presents a modeling approach to simulate the orientation of these mesogens in a flow channel with a rectangular cross section under no slip and …
View article: Processing of High-Performance Polymeric Materials: Modeling and Characterization
Processing of High-Performance Polymeric Materials: Modeling and Characterization Open
Polymers are an integral part of our world [...]
View article: Influence of Processing Parameters in Injection Molding on the Properties of Short Carbon and Glass Fiber Reinforced Polypropylene Composites
Influence of Processing Parameters in Injection Molding on the Properties of Short Carbon and Glass Fiber Reinforced Polypropylene Composites Open
Short-fiber reinforcement is a potent approach to improving the material properties of injection-molded parts. The main consideration in such reinforced materials is to preserve the fiber length, as this is the major influence on the prope…
View article: Estimation of the Shear Viscosity of Mixed-Polymer Materials for Screw Extrusion-Based Recycling Process Modeling
Estimation of the Shear Viscosity of Mixed-Polymer Materials for Screw Extrusion-Based Recycling Process Modeling Open
The scope of this work is the development of a method to estimate the temperature and shear rate-dependent viscosity of mixtures composed of two polymers. The viscosity curve of polymer mixtures is crucial for the modeling and optimization…
View article: Characterization of the rheological behavior of mixed miscible polymers derived from recycling processes
Characterization of the rheological behavior of mixed miscible polymers derived from recycling processes Open
Mechanical recycling of polymers often involves mixing polymer types with the same chemical structure but different properties, e.g., two PP grades with different melt flow rates. The change in the physical properties is of great interest.…
View article: Determination of the bulk density of different plastic granules as a function of pressure and temperature
Determination of the bulk density of different plastic granules as a function of pressure and temperature Open
This work deals with the bulk density of differently shaped raw materials, considering recycled, shredded film, spheroidal shaped virgin bulk material and two different cylindrical shaped polypropylene pellets. The mass flow rate and the p…
View article: Influence of Fiber Content and Dosing Position on the the Mechanical Properties of Short-Carbon-Fiber Polypropylene Compounds
Influence of Fiber Content and Dosing Position on the the Mechanical Properties of Short-Carbon-Fiber Polypropylene Compounds Open
The properties of short-fiber-reinforced composites depend on the fiber length of the reinforcing fibers. This fiber length is typically influenced by processing to different extents. In this work, we investigate the influence of processin…
View article: Enhanced Simulation of Infrared Heating of Thermoplastic Composites Prior to Forming under Consideration of Anisotropic Thermal Conductivity and Deconsolidation by Means of Novel Physical Material Models
Enhanced Simulation of Infrared Heating of Thermoplastic Composites Prior to Forming under Consideration of Anisotropic Thermal Conductivity and Deconsolidation by Means of Novel Physical Material Models Open
In recent years, thermoplastic composites have found their place in large business sectors and are in direct rivalry to thermoset matrix composites. In order to ensure efficient and lean processes, process modeling gains ever-growing atten…
View article: Influence of thermal deconsolidation on the anisotropic thermal conductivity of glass fiber reinforced, pre‐consolidated polypropylene sheets used for thermoforming applications
Influence of thermal deconsolidation on the anisotropic thermal conductivity of glass fiber reinforced, pre‐consolidated polypropylene sheets used for thermoforming applications Open
Modeling how thermoplastic composites are processed using thermoforming is a challenging task, and not only due to the heterogenic nature of the material. During the thermoforming processes, the polymeric matrix has to be heated above the …
View article: Modeling of the anisotropic thermal conductivity of fabrics embedded in a thermoplastic matrix system
Modeling of the anisotropic thermal conductivity of fabrics embedded in a thermoplastic matrix system Open
Processing of thermoplastic composites is increasingly gaining importance due to their excellent mechanical properties combined with their recycling‐feasibility. However, distinguishing anisotropic thermal properties of these materials mak…
View article: Melting Behavior of Heterogeneous Polymer Bulk Solids Related to Flood Fed Single Screw Extruders
Melting Behavior of Heterogeneous Polymer Bulk Solids Related to Flood Fed Single Screw Extruders Open
Melting models for flood fed single screw extruders, like the Tadmor model, describe the melting of pure thermoplastic polymers. However, the melting behavior of heterogenous polymer systems is of great interest for recycling issues, for e…
View article: Simulation of asymmetrical multilayer flat film coextrusion regarding slip at the wall and interfacial slip at the polymer-polymer interface
Simulation of asymmetrical multilayer flat film coextrusion regarding slip at the wall and interfacial slip at the polymer-polymer interface Open
This work deals with the simulation of the viscous flow of polymers in flat film coextrusion regarding asymmetrical films as well as slip at the wall and slip at the polymer-polymer interface. A one dimensional finite volume approach is us…
View article: Evaluation of the influence of the tool surface on polymer melt flow using a novel rheological extrusion slit die
Evaluation of the influence of the tool surface on polymer melt flow using a novel rheological extrusion slit die Open
In this paper, the influence of the tool surface on polymer melt flow is studied. For this purpose, a novel rheological extrusion slit die in conjunction with a lab-scale single screw extruder in which the die surface can be varied using e…
View article: Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters
Calculation of the Contact Angle of Polymer Melts on Tool Surfaces from Viscosity Parameters Open
It is of great importance for polymer processing whether and how viscosity influences the wettability of tool surfaces. We demonstrate the existence of a distinct relationship between the contact angle of molten polymers and zero shear vis…
View article: Effects of surface modification of talc on mechanical properties of polypropylene/talc composites
Effects of surface modification of talc on mechanical properties of polypropylene/talc composites Open
Low compatibility of polymer matrix and dispersed filler negatively affects the performance of polymeric composites. In order to improve the adhesion between the components in a compound the polymer matrix or/and the filler particles shoul…
View article: Evaluation of the melting behavior and the melt penetration into the solid bed using a model experiment
Evaluation of the melting behavior and the melt penetration into the solid bed using a model experiment Open
This work deals with the melting of polymeric bulk materials and the melt penetration into the solid bed utilizing a model experiment that simulates the melting process in single screw plasticating units. The polymer granules are pressed o…