Experimental and numerical studies for the gas-assisted extrusion forming of polypropylene micro-tube

Ren, Zhong; Huang, Xingyuan; Xiong, Zhihua

doi:10.1007/s12289-019-01482-7

Cited by 16 publications

(13 citation statements)

References 35 publications

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“…[ 47 ] To overcome the problems of extrudate swelling (Figure 2c), melt fracture, and extrudate distortion, a modified gas‐assisted extrusion forming system, which generates gas lubrication at the mold wall, has been established to prepare polypropylene (PP) microtubes, which reduced melt pressure and energy consumption. [ 48,49 ] Notably, this technique was outperformed the conventional extrusion methods. As shown in Figure 2b, the outer diameter ( Φ = 5.0 mm), inner diameter, and wall thickness (δ = 0.8 mm) of PP microtubes prepared using the traditional extrusion method are considerably larger than those of PP microtubes prepared using gas‐assisted extrusion method ( Φ = 3.1 mm and δ = 0.48 mm).…”

Section: Micro/nanomoldingmentioning

confidence: 99%

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

et al. 2022

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Polymers are widely used in optical devices, electronic devices, energy‐harvesting/storage devices, and sensors, owing to their low weight, excellent flexibility, and simple fabrication process. With advancements in micro/nanoprocessing techniques and more demanding application requirements, it is becoming necessary to realize high‐resolution fabrication of polymers to prepare miniaturized devices. This is particularly because conventional processing technologies suffer from high thermal stress and strong adhesion/friction, which can irreversibly damage the micro/nanostructures of miniaturized devices. In addition, although the use of advanced fabrication methods to prepare high‐resolution micro/nanostructures is explored, these methods are limited to laboratory research or small‐batch production. This review focuses on the micro/nanoprocessing of polymeric materials and devices with high spatial precision and replication accuracy for industrial applications. Specifically, the current state‐of‐the‐art techniques and future trends for micro/nanomolding, high‐energy beam processing, and micro/nanomachining are discussed. Moreover, an overview of the fabrication and applications of various polymer‐based elements and devices such as microlenses, biosensors, and transistors is provided. These techniques are expected to be widely applied for multiscale and multimaterial processing as well as for multifunction integration in next‐generation integrated devices, such as photoelectric, smart, and biodegradable devices.

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Section: Micro/nanomoldingmentioning

confidence: 99%

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

et al. 2022

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“…In addition, a non-slip condition was applied to the inner wall of the die and the land section, which is a straight section of the tip. To express the orientation by the puller, a linear velocity of 10 m/min was applied to the end of the free surface [26,27]. Finally, to preserve the lumen shape, compressed air pressure was applied to the lumen wall of the free surface at 2490 Pa.…”

Section: Numerical Modelingmentioning

confidence: 99%

Development of a Subpath Extrusion Tip and Die for Peripheral Inserted Central Catheter Shaft with Multi Lumen

Lee

Jeong

et al. 2021

Polymers

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The tip and die for manufacturing multi-lumen catheter tubes should be designed considering the flow velocity of the molten polymer and the deformation of the final extruded tube. In this study, to manufacture non-circular double-lumen tubes for peripherally inserted central catheters (PICCs), three types of tip and die structures are proposed. The velocity field and swelling effect when the circular tip and die (CTD) are applied, which is the commonly used tip and die structure, are analyzed through numerical calculation. To resolve the wall and rib thickness and ovality issues, the ellipse tip and die (ETD) and sub-path tip and die (STD) were proposed. In addition, based on the results of numerical analysis, the tip and die structures were manufactured and used to perform extrusion. Finally, we manufactured tubes that satisfied the target diameter, ovality, wall, and rib thickness using the newly proposed STD.

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“…Liang [ 24 ] introduced nitrogen into the HDPE melt round bar and die through the slit to form a stable gas cushion, which effectively reduced the die pressure drop and extrusion expansion rate of the melt and improved the quality and yield. Ren [ 25 , 26 , 27 ] found that the gas-assisted technology can overcome extrusion expansion, improve the surface quality of the micro-tube, and reduce the pressure, shear stress, and first normal stress difference of the melt inside the die through experimental research and numerical analysis. Liu [ 28 ] analyzed the effect of the inner gas cushion layer pressure on the melt pressure difference and the size of the micro-tube by numerical simulation and determined the control steps to stabilize the gas cushion layer during gas-assisted extrusion through experimental studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Studies on the Improvement of Gas Chamber Structure during Gas-Assisted Extrusion

et al. 2022

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In the gas-assisted extrusion process, the melt inside the die is in a low-viscosity molten state, so the flow field of the gas cushion layer has a great effect on the cross-sectional shape of the micro-tube. Therefore, this study establishes the gas distribution chamber model of the gas-assisted die. Ansys Fluent software was used to simulate the gas flow field of the gas distribution chamber. The effect of the gas chamber structure on the size of the micro-tube was analyzed by the extrusion experiment. The research shows that the velocity unevenness coefficient of the gas outlet of the single gas chamber die is 11.8%, which is higher than that of the double gas chamber die. The use of a double gas chamber die can improve the stability of the gas cushion layer and the wall thickness non-uniformity of the micro-tube, which verifies the simulation results.

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Experimental and numerical studies for the gas-assisted extrusion forming of polypropylene micro-tube

Cited by 16 publications

References 35 publications

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

Current and Future Trends for Polymer Micro/Nanoprocessing in Industrial Applications

Development of a Subpath Extrusion Tip and Die for Peripheral Inserted Central Catheter Shaft with Multi Lumen

Numerical and Experimental Studies on the Improvement of Gas Chamber Structure during Gas-Assisted Extrusion

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