10 Jahre Staatswissenschaften an der Universität Erfurt

Händschke, Sebastian G.M.

doi:10.1515/9783110289107.43

Cited by 2 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The first serial production of foamed parts for weight reduction took place in the 1970s. [8] Further developments at the Massachusetts Institute of Technology led to the manufacturing of microcellular foams (i.e., average cell sizes between 5 and 100 μm and cell densities greater than 10 9 cells/cm 3 ). [9] The technology was later licensed by Trexel Inc. (Wilmington, MA) under the trade name MuCell.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear influences of process parameters on mechanical properties of physically foamed, fiber‐reinforced polypropylene parts

Kastner

Steinbichler

Kahlen

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

The importance of foam injection molded components in industrial applications increases, above all driven by sustainability concerns. In practice, their applicability almost exclusively depends on their mechanical behavior, which is still difficult to predict based on their microstructure. This work aims to present an approach based upon phenomenological observations. From a processing perspective, the objective is to describe the direct processing‐properties‐relationship. Therefore, this work focuses on the effects of different processing parameters on selected final mechanical properties of foam injection molded components using glass fiber‐reinforced polypropylene. A full factorial, central composite design allows for the detection of nonlinear effects, the application of response surface methodology, and the creation of contour plots. Considering three important process parameters (mold temperature, degree of foaming, delay time) and—for the automotive industry—highly important mechanical properties in bi‐ and uniaxial bending, the results show a detailed picture of individual dependences, but also two‐dimensional interactions between the different process parameters. Improvements of more than 140% in absorbed energy and flexural stiffness were obtained at constant part weight. Modulus and strength were increased by 37 and 44%, respectively.

show abstract

Section: Introductionmentioning

confidence: 99%

Nonlinear influences of process parameters on mechanical properties of physically foamed, fiber‐reinforced polypropylene parts

Kastner

Steinbichler

Kahlen

et al. 2020

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…One crucial exponent in terms of sustainability is injection foam molding, which allows for the production of sandwich structures (foamed core, compact outer layers) by using gases as blowing agents. Dissolved gases were initially used for the elimination of sink marks in the 1950s, the first serial production of foamed components was established in the 1970s . Further developments and the use of supercritical fluids (SCFs) eventually lead to microcellular foams with average cell sizes between 5 and 100 μm and cell densities greater than 10 9 cells/cm 3 .…”

Section: Introductionmentioning

confidence: 99%

Theoretical Background and Automation Approach for a Novel Measurement Method for Determining Dynamic Solubility Limits of Supercritical Fluids in Injection Foam Molding

Kastner

Steinbichler

2019

Polymer Engineering & Sci

View full text Add to dashboard Cite

In terms of sustainability, injection foam molding gains in importance. Yet still many questions throughout the whole process remain unanswered. Especially, the conditions inside the cylinder during gas injection are fraught with uncertainty. Our development of a new methodology for the determination of dynamic solubility in injection foam molding helps to answer the most basic question regarding gas loading: Using the bulk modulus of the polymer-gas mixture, the dynamic solubility limit can be detected. In a first series of tests, the methodology was verified with simultaneous ultrasonic measurements-an excellent agreement was observed. In this work, a second, more thorough test series is presented. Using the bulk modulus methodology on different polypropylene grades, dynamic solubility limits between 0.62 and 2.56 wt% nitrogen at pressures between 80 and 200 bar and a temperature of 230 C were determined directly on an injection molding machine. The detailed theoretical background for this technique, as well as a mathematical automation approach, is provided. This innovative yet simple method yields novel insights on process limits and provides the possibility of an a priori machine setup or a fully automatic self-adjustment of the machine. POLYM. ENG. SCI., 60:330-340, 2020.

show abstract

10 Jahre Staatswissenschaften an der Universität Erfurt

Cited by 2 publications

References 0 publications

Nonlinear influences of process parameters on mechanical properties of physically foamed, fiber‐reinforced polypropylene parts

Nonlinear influences of process parameters on mechanical properties of physically foamed, fiber‐reinforced polypropylene parts

Theoretical Background and Automation Approach for a Novel Measurement Method for Determining Dynamic Solubility Limits of Supercritical Fluids in Injection Foam Molding

Contact Info

Product

Resources

About