[논문]마이크로 카테터 압출 공정을 위한 다이 설계 최적화에 관한 연구

조승기; 이은택

doi:10.14775/ksmpe.2021.20.01.034

[국내논문] 마이크로 카테터 압출 공정을 위한 다이 설계 최적화에 관한 연구
A Study on Die Design Optimization for Microcatheter Extrusion Processes 원문보기

한국기계가공학회지 = Journal of the Korean Society of Manufacturing Process Engineers, v.20 no.1, 2021년, pp.34 - 41

조승기 (금오공과대학교 기계시스템공학과) , 이은택 (금오공과대학교 기계시스템공학과)

Abstract ▼ AI-Helper

Interventional radiology and minimally invasive surgery both require a precisely shaped microcatheter. Microcatheters are manufactured using polymer extrusion processes with a die and puller. The manufacturing parameters and die geometry greatly influence the profile of the extrudate and designing dies using a trial-and-error process is expensive and requires a lot of time. Therefore, predicting the profile of the extrudate is important for manufacturing microcatheters. This study investigates the effects of die design and geometry on the profile of the extrudate. The profiles of the extrudate are predicted using ANSYS Polyflow with respect to the different die geometries. The outer and inner diameters and wall thickness of the predicted extrudate are compared to those of a target extrudate. The die swell of melt polymer and the effect of the pulling are both examined. Optimized die designs are suggested for manufacturing the target extrudate.

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문제 정의

This study conducts a numerical analysis of die design optimization to obtain the target extrudate of the desired size. A microcatheter of a commonly used size is set as the target extrudate, and the molten polymer flow is analyzed by using ANSYS Polyflow.

가설 설정

inertia is neglected. In this study, because the length of the free surface between the die end and the vacuum and cooling tank is short, the effect on gravity is neglected. Equation (1) represents the mass conservation equation^[9].

제안 방법

,es et al.^[2] validated the code developed to predict the flow field of polymer melts in limited channels using the generalized Newtonian model, and the developed code was used to improve the flow distribution of complex profile extrusion dies for manufacturing medical catheters. Tian et al.
However, there are few studies on the effects of the changes in die shape and size requiring repetitive design on the shape of extrudates. Therefore, this study analyzes the rheological flow of polymers using ANSYS Polyflow and predicts and compares the shapes of the final extrudate for dies of various sizes. Based on the results, an optimal die design method is suggested.
In this study, the velocity field at the die land and the free surface was obtained to examine the effects of the velocity distribution on the swelling at the beginning of the free surface. Fig.

대상 데이터

The polymer used in the study is PEBAX 7233 purchased from Arkema Inc. whose density is 1, 010 kg/m³. Table 1 shows the parameters of the cross law model^[4].

이론/모형

Lee and Lyu^[4] analyzed the tube-shaped extrusion process by using the generalized Newtonian model (cross law model) and the PTT model, which is a nonlinear viscoelastic model, and identified the effects of the relaxation time on the extrudate. Liu et al., ^[5] through numerical analysis, analyzed the effects of various extrusion process variables on the cross-sectional phenomenon of the catheter extrudate and performed the optimization of the extrusion process conditions for manufacturing catheters with a uniform cross-sectional phenomenon by using the Taguchi technique. Cho et al.
where  refers to the th velocity,  refers to the pressure, and  refers to the shear stress. This study utilizes the generalized Newtonian model to show the rheological behavior. In the generalized Newtonian model, the shear stress is defined as follows[9]
An extrusion process analysis was performed by using a generalized Newtonian model. The target extrudate was Target 1, the flow rate was 138 mm³/s, and a speed of 100 mm/s was applied to the end of the free surface during the extrusion process.
desired size. A microcatheter of a commonly used size is set as the target extrudate, and the molten polymer flow is analyzed by using ANSYS Polyflow. Dies of various sizes are used to obtain the target extrudate, and an optimized die design method is presented from the results.

성능/효과

The same study confirmed that as the puller speed increased, the cross-sectional area of the extrudate became smaller, and so did the lumen size. The study also confirmed that the effects of air pressure acting on a specific lumen were related to other lumens, as well as changes in roundness and long diameter. However, in general, the shape of the die has a great influence on that of the final extrudate.

참고문헌 (9)

Tian, H., Zhao, D., Wang, M. and Jin, Y., "Effect of die lip geometry on polymer extrudate deformation in complex small profile extrusion," Journal of Manufacturing Science and Engineering, Vol. 139, No. 6, pp. 061005, 2017.

상세보기
Goncalves, N. D., Carneiro, O. S. and Nobrega, J. M., "Design of complex profile extrusion dies through numerical modeling," Journal of Non-Newtonian Fluid Mechanics, Vol. 200, pp. 103-110, 2013.

상세보기
Tian, H., Zhao, D., Wang, M., Jin, G. and Jin, Y., "Study on extrudate swell of polypropylene in double-lumen micro profile extrusion," Journal of Materials Processing Technology, Vol. 225, pp. 357-368, 2015.

상세보기
Lee, M. A. and Lyu, M. Y., "Computational Study on the Extrusion of Annular Shaped Product Considering Viscoelastic Characteristics," POLYMER-KOREA, Vol. 41, No. 2, pp. 227-234, 2017.

상세보기
Liu, W., Kim, W. and Park, J.M., "Numerical Study on the Optimization of Polymer Extrusion Process for a Single-Lumen Micro Catheter," TRANSACTIONS OF THE KOREAN SOCIETY OF MECHANICAL ENGINEERS A, Vol. 42, No. 12, pp. 1059-1065, 2018.

상세보기
Cho, S., Lee, E., Jo, S., Kim, G. and Kim, W., "Extrusion Characteristics of Thin Walled Tubes for Catheters Using Thermoplastic Elastomer," Polymers Vol. 12, No. 8 pp. 1628, 2020.

상세보기
Jin, G.-B., Zhao, D.-Y., Wang, M.-J., Jin, Y.-F., Tian, H.-Q. and Zhang, J., "Study on design and experiments of extrusion die for polypropylene single-lumen micro tubes," Microsystem Technologies Vol. 21, No. 11, pp. 2495-2503, 2015.

상세보기
Jin, G., Jin, Y., Zhao, D. and Zhang, Q., "Cross-section design of multi-lumen extrusion dies: study on the effects of die swell and gas flow rate of the lumen," Microsyst Technol, Vol. 23, No. 10, pp. 5093-5104, 2017.

상세보기
Jo, S. G. and Lee, E., "Numerical Study on the Effects of the Manufacturing Parameters for Multi-Lumen Catheter Extrusion," Journal of the Korean Society for Precision Engineering, Vol. 37, No. 1, pp. 17-24, 2020.

상세보기

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연합인증

[국내논문] 마이크로 카테터 압출 공정을 위한 다이 설계 최적화에 관한 연구
A Study on Die Design Optimization for Microcatheter Extrusion Processes 원문보기

Abstract ▼ AI-Helper

Keyword

AI 본문요약
AI-Helper

문제 정의

가설 설정

제안 방법

대상 데이터

이론/모형

성능/효과

참고문헌 (9)

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연합인증

[국내논문] 마이크로 카테터 압출 공정을 위한 다이 설계 최적화에 관한 연구 A Study on Die Design Optimization for Microcatheter Extrusion Processes 원문보기

Abstract ▼ AI-Helper

Keyword

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문제 정의

가설 설정

제안 방법

대상 데이터

이론/모형

성능/효과

참고문헌 (9)

이 논문을 인용한 문헌

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[국내논문] 마이크로 카테터 압출 공정을 위한 다이 설계 최적화에 관한 연구
A Study on Die Design Optimization for Microcatheter Extrusion Processes 원문보기

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