Determination of gas length for gas-assisted extrusion forming of polymer melt

3rd International Conference on Advanced Materials Research and Applications

Ren, Z.^1,2 ; Huang, X.Y.^2

Key Laboratory of Optic-Electronic and Communication, Jiangxi Science and Technology Normal University, Nanchang

330038, China^1

School of Mechanical and Electrical Engineering, Nanchang University, Nanchang

330031, China^2

关键词: Extrudate swell;    Extrusion forming;    Geometric modeling;    Numerical investigations;    Numerical results;    Slip boundary conditions;    Volume flow rate;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/170/1/012028/pdf
DOI  :  10.1088/1757-899X/170/1/012028

来源: IOP

【 摘 要 】

To determine the optimal gas length for the gas-assisted etrusion forming of melt, numerical investigations about the gas length on the extrudate swell of melt were performed by using the finite element method. Meanwhile, the geometric model of gas-assistd extrusion forming was established. The full slip boundary condition was used as the gas-assisted condition. Numerical results show that the gas length should be shortened with increasing of the inlet volumme flow rate of melt. In addition, under the given inlet volume flow rate of melt, the extrudate swell ratio, X velocity and shear stress of melt greatly decreases with increasing the gas length. Accroding to the numerical results and experiences reported past time, under the inlet volume flow rate of 0.5cm3/s, the optimal gas lenth of gas-assisted extrusion forming is about 10mm.