Simulation study on influence of position of homogenizing plate in plastic film blowing machine

doi:10.19491/j.issn.1001-9278.2025.06.009

Abstract

Abstract:

This study reported an investigation on a specific model of a blown film machine， considering the coupled interaction between its internal wind field and temperature field. A three⁃dimensional finite element model of the wind field was developed to analyze the characteristics of both the wind and temperature fields. Additionally， the research examines how the positioning of the flow⁃equalizing plate within the machine influences the pressure， velocity， and temperature distribution at the air outlet. The results indicated that increasing the height of the flow⁃equalizing plate led to minimal changes in the average pressure and velocity at the air outlet， with both parameters exhibiting a slight upward trend. Furthermore， the velocity distribution across the air outlet between static pressure boxes demonstrates an initial trend toward uniformity before transitioning to dispersion. Notably， the position of the flow⁃equalizing plate has negligible impact on both the air outlet temperature and the velocity distribution within individual static pressure boxes.

Key words: plastic film, film blowing machinery, homogenizing plate, finite element, fluid?structure interaction

CLC Number:

TQ320.66

BU Zehua, LI Shiyong, LIU Jinjun, ZHAO Haoyu, ZOU Jianan, LI Hongxia. Simulation study on influence of position of homogenizing plate in plastic film blowing machine[J]. China Plastics, 2025, 39(6): 42-47.

Figures/Tables 10

Fig.1. 3D model of the film blowing machine

Fig.2. Structural schematic diagram of the flow equalizing plate

Fig.3. Variation diagram of the average velocity at the exhaust port under different mesh numbers

Fig.4. Mesh generation for the film blowing machine

Fig.5. Pressure contour maps of the flow equalizing plate and its circular hole channels under different heights

Fig.6. Comparison of exhaust pressure under different heights of the flow equalizing plate

Fig.7. The average velocity at the air outle and comparison of the standard deviation of the velocity at the air outlet between static pressure boxes under different heights of the flow equalizing plate

Fig.8. Velocity distribution contour maps of the film blowing machine at different heights

Fig.9. Comparison of the standard deviation of the velocity at the air outlet within each static pressure box

Fig.10. Temperature distribution contour maps of the film blowing machine at different heights.

References 10

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