A Hybrid Approach to Model the Drag-Flow Capacity of Co-Rotating Twin-Screw Extruder Kneading Blocks

Roland, Wolfgang; Stritzinger, Ursula; Albrecht, Hanny; Löw-Baselli, Bernhard; Berger‐Weber, Gerald

doi:10.1016/j.ifacol.2022.09.082

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…Further, the maximum surrogate relative error was 8.10%, thus below the threshold of 10%. The prediction model for the auxiliary parameter b 3 , defined in Equation (30), can be transformed into a prediction model for the element conductance B 3 as defined in Equation (31), by using Equation (18). Hence, the element conductance can be described by the nine subfunctions and 26 model constants listed in the Appendix.…”

Section: Prediction Modelsmentioning

confidence: 99%

“…For the analytical modeling, the conveying and power‐consumption behaviors of Newtonian fluids were described with novel conveying and power parameters, which were introduced by our research group to enable a description of conveying and neutral kneading blocks with the same parameters. [ 19,28–30 ] For this purpose, a dimensional analysis based on the Buckingham Π‐theorem [ 31 ] was performed, which yielded the following dimensionless parameters:

Π_{D} = \frac{D_{a}}{D_{k}} .

Π_{α} = α .

Π_{B} = \frac{B}{D} .

Π_{s_{2}} = \frac{s_{2}}{B} .

Π_{V} = \frac{V}{D^{2} L} .

Π_{\overset{V}{true}} = \frac{\overset{V}{true}}{D^{3} N} .

Π_{p^{'}} = \frac{D}{italicηN} \frac{\partial p}{\partial z} .

Π_{italicPow} = \frac{1}{D^{2} N^{2} η} \frac{P}{L} .

Π_{{\dot{Q}}_{Diss}} = \frac{1}{D^{2}}

…”

Section: Introductionmentioning

confidence: 99%

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Modeling melt conveying and power consumption of co‐rotating twin‐screw extruder kneading blocks: Part B. Prediction models

Stritzinger

Roland

Berger‐Weber

et al. 2023

Polymer Engineering & Sci

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Intermeshing co‐rotating twin‐screw extruders are very versatile because their screw configurations can be tailored both to the application and to the properties of the materials used. Finding the best screw configuration is one of the main purposes of twin‐screw extrusion modeling, and requires models that accurately predict conveying and power consumption. The better the process can be predicted, the better the requirements of the final product can be met. We present novel prediction models of the conveying and power‐consumption behaviors of intermeshing co‐rotating twin‐screw extruder kneading blocks for Newtonian fluids. These are based on numerical simulations and therefore consider the complex three dimensional (3D) geometry of this element type without the need for common simplifications. Our models are thus capable of including all leakage flows and gap influences, which are usually ignored, for example, by the flat‐plate model. Since our models are derived by symbolic regression based on genetic programming, they consist of algebraic functions and are low‐threshold. They can be used to calculate various process parameters for individual kneading blocks or entire screw configurations, as illustrated by a use case.

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Section: Prediction Modelsmentioning

confidence: 99%

Π_{D} = \frac{D_{a}}{D_{k}} .

Π_{α} = α .

Π_{B} = \frac{B}{D} .

Π_{s_{2}} = \frac{s_{2}}{B} .

Π_{V} = \frac{V}{D^{2} L} .

Π_{\overset{V}{true}} = \frac{\overset{V}{true}}{D^{3} N} .

Π_{p^{'}} = \frac{D}{italicηN} \frac{\partial p}{\partial z} .

Π_{italicPow} = \frac{1}{D^{2} N^{2} η} \frac{P}{L} .

Π_{{\dot{Q}}_{Diss}} = \frac{1}{D^{2}}

…”

Section: Introductionmentioning

confidence: 99%

Modeling melt conveying and power consumption of co‐rotating twin‐screw extruder kneading blocks: Part B. Prediction models

Stritzinger

Roland

Berger‐Weber

et al. 2023

Polymer Engineering & Sci

Self Cite

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“…30°, 45°, 60° kanat açıklığındaki vidalar kısmi olarak malzeme iletimi sağlarken 90° vidaların malzeme iletim kabiliyetleri hiç yoktur. Sadece akış yönünde taşınan malzemenin etkisi ile üzerinden malzeme akışı sağlanır [16]- [18].…”

Section: Materyal Ve Yöntemunclassified

Aynı Yöne Dönen Çift Vidalı Ekstrüderli Tandem Bir Termoplastik Geri Dönüşüm Sisteminde Vida Yapılanmasının İncelenmesi

Bakırcı,

Koçak,

Yamaç

et al. 2023

OPRD

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Polymers have rapidly replaced the utilization of glasses, ceramics, metals, and organic textiles due to their cost-effectiveness, lightweight nature, and enhanced functionality. Nevertheless, as a consequence of their chemical composition, polymers undergo a protracted degradation process in natural environments, resulting in a significant accumulation of plastic waste since their inception. This accumulation has now reached a critical threshold, posing a substantial risk to both human well-being and the preservation of natural ecosystems. In the recycling process of thermoplastic wastes, it is necessary to subject them to two rounds of melting in order to obtain compounds. This practice results in a reduction of the recycling numbers associated with thermoplastics, which possess a finite recycling lifespan, by 50%. The present work involved the construction of a tandem recycling process, wherein molten waste polymers were immediately introduced into a co-rotating twin screw extruder. In contrast to alternative approaches, a process-dependent screw configuration has been devised for the twin-screw system employed in the delivery of molten material. The product derived from 80% waste thermoplastic was thereafter compared to the original product as an outcome of the aforementioned procedure. Properties similar to those of pure Polypropylene were seen in some physical and chemical characteristics.

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Influence of twin-screw elements on dispersion of nano-clay in vinyl ester polymer composites using Taguchi’s orthogonal array technique

Raj,

Tanuja,

Kumar

et al. 2023

Int J Interact Des Manuf

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This work aims to experimentally investigate the influence of screw elements on the dispersion of Cloisite-15A in vinyl ester based on the design of experiments using MINITAB-V16 software. Experiments were designed considering two main factors such as Cloisite-15A loading (1, 2, 3, and 4 wt%) and type of screw elements with a varying number of kneading elements (type 1 with 55 mm, kneading elements and type 2 with 90 mm, kneading elements). The dispersion procedure of Cloisite-15A in vinyl ester was carried out by a combination of both ultrasonication and then twin-screw extrusion. The influence of these factors on the tensile strength and hardness was studied using an experimental layout possessing Taguchi’s L8 Orthogonal Array technique. ANOVA of the experimental results revealed the dispersion of Cloisite-15A with vinyl ester proved to be better when processed with type 2 screw elements having more kneading screws. The S/N ratio study showed that the Cloisite-15A loading had the greatest impact on the type 2 screw's tensile and hardness values for the Cloisite-15A/vinyl ester gel coats when treated at 230 rpm with 10 passes. The probability graphs led to the conclusion that, with a 95% confidence interval, all response values were distributed equally along the normal probability plot's trend. In order to achieve the best response in terms of mechanical strength, the Grey Relational Analysis (GRA) helped identify the best combination of process variables. This combination was known to be 4 wt% Cloisite-15A loading, with type 2 screw processed at 230 rpm with 10 passes. The SEM and XRD showed the absence of agglomeration and better exfoliation of Cloisite-15A in the gel coats with 4 wt% of clay loading.

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A Hybrid Approach to Model the Drag-Flow Capacity of Co-Rotating Twin-Screw Extruder Kneading Blocks

Cited by 4 publications

References 14 publications

Modeling melt conveying and power consumption of co‐rotating twin‐screw extruder kneading blocks: Part B. Prediction models

Modeling melt conveying and power consumption of co‐rotating twin‐screw extruder kneading blocks: Part B. Prediction models

Aynı Yöne Dönen Çift Vidalı Ekstrüderli Tandem Bir Termoplastik Geri Dönüşüm Sisteminde Vida Yapılanmasının İncelenmesi

Influence of twin-screw elements on dispersion of nano-clay in vinyl ester polymer composites using Taguchi’s orthogonal array technique

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