Producing Microlayer Pipes and Tubes through Multiplication Coextrusion and Unique Annular Die: Simulation and Experiment

Yu, Guiying; Ji, Yuan; Qin, Jingxian; Hong, Weiyouran; Li, Chunhai; Zhang, Guangdong; Wu, Hong; Guo, Shaoyun

doi:10.1021/acs.iecr.1c03894

Cited by 10 publications

(8 citation statements)

References 39 publications

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“…The analysis enables an accurate prediction of the die swell [ 13 ] and interface offset [ 14 ]. Additionally, this analysis aids in identifying potential concerns, such as flow imbalance, interfacial defects [ 15 ], or uneven die swell, which can impact layer uniformity and the overall quality of the end product [ 16 ]. Consequently, it facilitates the optimization of flow channel geometry and process parameters within the coextrusion die, ensuring the attainment of the desired geometric accuracy for the extrudate.…”

Section: Introductionmentioning

confidence: 99%

Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

2023

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The main challenge in a polymer coextrusion process is to have a good die design prior to the process, which can minimize the geometric errors that are caused by extrusion swell and interface motion. For this purpose, a coupling method of optimization and inverse design for a coextrusion die was studied for a medical striped catheter. In the study, the main material was thermoplastic polyurethane (TPU), and the auxiliary material was TPU filled with 30 wt% barium sulfate. An overall optimization design method was used to optimize the geometry of the extrusion die channel for the striped catheter, which had a complex geometry. In the global optimization process, the local inverse design method was used to design the inlet of the auxiliary material. The non-linear programming by quadratic Lagrangian (NLPQL) algorithm was used to obtain the optimal geometric solution of the coextrusion die runner. The experimental verification results showed that the coupling method for coextrusion die design improved the design efficiency of the coextrusion die remarkably. The value of the objective function, which was used to measure the geometric error of the product, was reduced by 72.3% compared with the initial die design.

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Section: Introductionmentioning

confidence: 99%

Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

2023

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“…The existing blown film dies are mainly divided into three types: side-feeding mandrel die, center-feeding cross die, and spiral die, − but they all have some defects that are difficult to solve. For the mandrel die, the melt velocity in flow channel is unevenly distributed in the annular direction, resulting in nonuniform film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…In Section , the theoretical model is verified by numerical simulation. The flow model with the optimum geometric design is screened out by analyzing the flow behavior through the flow numerical simulation . Finally, the conclusions are drawn in Section .…”

Section: Introductionmentioning

confidence: 99%

A Novel Mandrel-Free Blown Film Die with Ultrashort Flow Distance and Uniform Discharge: Theoretical Modeling and Simulation

Gao

Wang

et al. 2022

Ind. Eng. Chem. Res.

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In the blown film industry, the nonuniformity in films has been one of the most important problems, and the existing structures of blown films dies have many disadvantages, such as long thermal process and complex structure. This work proposes a novel flow channel structure of blown film die via theoretical modeling and verified by numerical simulations. The results show that the new structure is simple without the mandrel structure that is commonly used in the blown film die, capable of achieving the circumferential uniformity of the film at outlet in an ultrashort flow distance, which can largely avoid the polymer degradation and is well adaptable to different polymers. This work has successfully constructed a special geometry of flow channel without any other complicated elements to achieve uniform discharge, which provides new strategies to deal with the problem of nonuniform film thickness.

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“…26 Also, polymer multilayers can be grown using various simple and fast techniques, such as copolymer self-assembly, 34,35 dip coating, 36 spin coating, 37 and even coextrusion, 25 an industrial method that makes them compatible with current packaging production. 25,38 In this context, we propose a hybrid polymer−inorganic DBR for the detection of biogenic amines in the vapor phase. Amines are indeed the typical degradation byproducts of protein-based food.…”

mentioning

confidence: 99%

“…Also, polymer multilayers can be grown using various simple and fast techniques, such as copolymer self-assembly, , dip coating, spin coating, and even coextrusion, an industrial method that makes them compatible with current packaging production. , …”

mentioning

confidence: 99%

Beyond Labeling: Hybrid Planar Photonic Crystals for Anti-tampering Detection of Amines

Escher,

Alloisio,

Cavallo

et al. 2024

ACS Appl. Opt. Mater.

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Smart packaging promises to protect consumer health and safety, reduce food waste, and decrease energy and resource consumption. In other words, less food waste leads to better living conditions, decreasing plastic waste and greenhouse gas emissions. This work aims to create a colorimetric label for assessing food freshness by monitoring biogenic amines, which are the typical degradation byproducts of protein-based food such as meat, fish, and seafood. We focus on planar photonic crystals consisting of alternating thin films of a titanium dioxide-poly(acrylic acid) hybrid as a high-refractive-index medium and a blend of polystyrene and polylactic acid as a low-index and sensitive material. The colorimetric response of these sensors can be detected by visible reflectance spectroscopy and is visible to the naked eye, allowing a straightforward interpretation by any user. The response is tested for a prototype amine and for chicken meat, and it is caused by the loss of the structural color of the dielectric lattice resulting from the aminolysis of the polylactic acid that induces the collapsing of the rigid hybrid layers, thus providing effective nonreversible antitampering systems for smart labeling.

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Producing Microlayer Pipes and Tubes through Multiplication Coextrusion and Unique Annular Die: Simulation and Experiment

Cited by 10 publications

References 39 publications

Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

Improved Optimization of a Coextrusion Die with a Complex Geometry Using the Coupling Inverse Design Method

A Novel Mandrel-Free Blown Film Die with Ultrashort Flow Distance and Uniform Discharge: Theoretical Modeling and Simulation

Beyond Labeling: Hybrid Planar Photonic Crystals for Anti-tampering Detection of Amines

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