Effect of screw configuration on performance of PLA/PTW blends

doi:10.19491/j.issn.1001-9278.2023.11.014

Abstract

Abstract:

Four types of screw configurations in the mixing section were designed for a co⁃rotating twin screw extruder using shear elements （KB⁃elements）， tensile elements （S⁃elements）， conventional threaded elements （SE⁃elements）， and mixed elements （SME elements）. The influence of screw configuration on the mixing effect of poly（lactic acid） PLA/ethylene⁃butyl acrylate⁃glycidyl methacrylate copolymer （PTW） blends was simulated and studied. The forward conveying ability， dispersion mixing ability， and distribution mixing ability of the screw configuration were investigated through employing the pressure difference between the inlet and outlet， weight⁃average shear stress， cumulative maximum shear stress， backflow rate， and cumulative residence time， respectively. The mechanical properties of as⁃prepared composite materials were studied using an experimental method. The results indicated that KB elements and SME elements had strong dispersion and distribution mixing abilities， and the PLA/PTW blends obtained a better mixing effect. Such a screw configuration could further improve the impact strength of the composite materials， whereas their tensile strength almost kept stable. At the same time， the simulation results were consistent with the experimental ones， indicating that the simulation can provide guidance for optimizing the screw configuration in the mixing section.

Key words: screw configuration, mixing performance, numerical simulation, mechanical property

CLC Number:

TQ320.7

MA Xiuqing, LAO Zhichao, LI Mingqian, HAN Shuntao, HU Nan. Effect of screw configuration on performance of PLA/PTW blends[J]. China Plastics, 2023, 37(11): 127-134.

Figures/Tables 16

编号	螺杆构型	类型
B1	KB/60/60°⁃SE/20/30⁃SME/20/60	KB/SME，分散布置
B2	SE/20/30⁃KB/60/60°⁃SME/20/60	KB/SME，集中布置
B3	S/2/60⁃SE/20/30⁃SME/20/60	S/SME，分散布置
B4	SE/20/30⁃S/2/60⁃SME/20/60	S/SME，集中布置

Tab.1. Configuration of the mixing section screws

Polyflow

网格重叠

机筒

六面体

Gambit

Tab.2. Grid division strategy

区域	T₁	T₂	T₃	T₄	T₅	T₆	T₇
加工温度/ $℃$	150	160	170	180	180	170	155

区域	T₁	T₂	T₃	T₄	T₅	T₆	T₇
加工温度/ $℃$	150	160	170	180	180	170	155

Tab.3. Temperature setting value of each section of the barrel

Fig.1. Schematic diagram of the screw configuration

类别

喷嘴温度/

$℃$

填充率/

打印速率/

mm $∙$ s^-1

打印平台温度/

$℃$

类别

喷嘴温度/

$℃$

填充率/

打印速率/

mm $∙$ s^-1

打印平台温度/

$℃$

拉伸试样制备

210

冲击试样制备

210

100

Tab.4. 3D printer process parameter

Fig.2. Pressure clouds images of the four screw configurations

Fig.3. Pressure difference of inlet and outlet of the four screw configurations

Fig.4. Shear stress cloud images of the four screw configurations

Fig.5. Weighted average shear stress of the four screw configurations

Fig.6. Backflow rate of the four screw configurations

Fig.7. Cumulative residence time of 80 % particles of the four screw configurations

Fig.8. Cumulative maximum shear stress of 80 % particles prepared with four screw configurations， respectively

螺杆构型	$N 1$	$N 2$	$N 3$
B1	0.352 7	0.729 9	1.082 6
B2	0.347 7	0.710 6	1.058 3
B3	0.304 3	0.685 1	0.989 4
B4	0.302 9	0.646 3	0.949 2

螺杆构型	$N 1$	$N 2$	$N 3$
B1	0.352 7	0.729 9	1.082 6
B2	0.347 7	0.710 6	1.058 3
B3	0.304 3	0.685 1	0.989 4
B4	0.302 9	0.646 3	0.949 2

Tab.5. Mixing coefficients of PLA/PTW blends under four screw configurations， respectively

Fig.9. Mechanical properties of PLA/PTW composites under four screw configurations， respectively

螺杆构型	冲击强度/kJ·m^-2	拉伸强度/MPa	$N 4$
B1	28.02	18.81	46.83
B2	25.69	18.64	44.33
B3	19.32	18.24	37.56
B4	18.25	18.05	36.30

螺杆构型	冲击强度/kJ·m^-2	拉伸强度/MPa	$N 4$
B1	28.02	18.81	46.83
B2	25.69	18.64	44.33
B3	19.32	18.24	37.56
B4	18.25	18.05	36.30

Tab.6. Comprehensive mechanical property index of PLA/PTW composites under four screw configurations， respectively

螺杆构型	$N 1$	$N 4$
B1	1.082 6	46.83
B2	1.058 3	44.33
B3	0.986 9	37.56
B4	0.949 4	36.30

螺杆构型	$N 1$	$N 4$
B1	1.082 6	46.83
B2	1.058 3	44.33
B3	0.986 9	37.56
B4	0.949 4	36.30

Tab.7. Comprehensive mixing coefficient and comprehensive mechanical property index of PLA/PTW composites under four screw configurations， respectively

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