Cross-section design of multi-lumen extrusion dies: study on the effects of die swell and gas flow rate of the lumen

Jin, Guobao; Jin, Yifei; Zhao, Danyang; Dai, Guanghui; Zhang, Qingqing

doi:10.1007/s00542-017-3489-3

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…It is noted that pulling speed and gas flow rate can also affect the shapes and dimensions of the extruded catheters based on the previously reported results. [22] Therefore, in the following section, the effects of different outer layer materials, pulling speed, gas flow rate, and screw rotation speeds on the cross section of the extruded three-layered balloon catheters will be experimentally investigated.…”

Section: Numerical Simulationsmentioning

confidence: 99%

Theoretical and experimental study on three‐layered polymeric balloon catheter processing

Jin

Hua

Wang

et al. 2020

Polymer Engineering & Sci

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Multilayered polymeric balloon catheters, one of the most important components during interventional treatment, are drawing more attention recently due to the microscale cross section, excellent mechanical properties, and high accuracy. During multilayered polymeric balloon catheter processing, many operating conditions can affect the size and shape of cross sections. In this study, polymer melt flow behavior inside extrusion die is theoretically analyzed first. Then, ethylene vinyl acetate (EVA) and polypropylene (PP) are selected as the build materials to produce the middle and inner layers of three‐layered polymeric balloon catheters, while polyamide (PA) and thermoplastic elastomer (TPE) are used to make the outer layer of two types of catheters, respectively. Based on the material selection, a three‐layered coaxial die is designed and manufactured to coextrude three different polymer melts to form corresponding catheters. In addition, the effects of operating conditions including outer layer materials, pulling speed, gas flow rate, and screw rotation speeds on the diameters and wall thicknesses as well as the concentricity and ovality of the extrudates are investigated. Finally, the PA‐EVA‐PP and TPE‐EVA‐PP three‐layered catheters are successfully fabricated, which have well‐defined geometries and high shape accuracy.

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Section: Numerical Simulationsmentioning

confidence: 99%

Theoretical and experimental study on three‐layered polymeric balloon catheter processing

Jin

Hua

Wang

et al. 2020

Polymer Engineering & Sci

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“…In addition, Jin et al analyzed the swelling phenomenon occurring at the tip and die when fabricating a multi-lumen microtube and optimized the air flow rate applied to the lumen. They found that to fabricate tubes with a good shape, the cross-section of the die must be optimized by considering the effect of both the die swell and the gas flow rates [8]. Tian et al studied microsized double-lumen tube extrusion processes and swelling phenomena using polypropylene.…”

Section: Introductionmentioning

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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“…These thin tubes are generally 300–2000 mm long, with a single-lumen (cavity in the tube) or multi-lumen cross-section and a braided or coiled shaft to meet the demands of the application. During use, the distal portion of the catheter (the far end) is steered unidirectionally or bidirectionally [ 4 , 5 , 6 , 7 , 8 ]. Today, catheters are commonly fabricated from thermoplastic elastomers [ 9 , 10 ] through an extrusion process [ 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer

Cho

Lee

et al. 2020

Polymers

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As the market for minimally invasive surgery has grown, the demand for high-precision and high-performance catheters has increased. Catheters for the diagnosis and treatment of cardiovascular or cerebrovascular disease mainly use a braided wire tube with a polymer inner liner and outer jacket to improve the pushability and trackability. The outer jacket should have an accurate inner and outer diameter and while maintaining a wall thickness of 150 µm or less. In this study, we designed and manufactured a tip and die capable of extruding an outer jacket with a wall thickness of 150 µm or less using a medical thermoplastic elastomer for manufacturing 8Fr (2.64 mm diameter) thin-walled tubes. The ovality and inner/outer diameters of the tube were studied according to changes in the screw speed (mass flow rate), puller speed, air pressure applied to the lumen, and distance between the quench and head, which are the main variables of microextrusion processes. The screw speed (mass flow rate), puller speed, and air pressure affected the inner/outer diameter of the tube, with screw speed and puller speed having the largest influence on diameter. The air pressure and distance between quench and head had the greatest influence on ovality. The results show the effect of different processing parameters on the characteristics of the extruded tube, which will help to establish a stable extrusion process for the manufacture of outer jackets for braided catheter shafts.

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Cross-section design of multi-lumen extrusion dies: study on the effects of die swell and gas flow rate of the lumen

Cited by 12 publications

References 7 publications

Theoretical and experimental study on three‐layered polymeric balloon catheter processing

Theoretical and experimental study on three‐layered polymeric balloon catheter processing

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

Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer

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