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《工程塑料应用》 2021年第06期
DOI:10.3969/j.issn.1001-3539.2021.06.013
同向差速双螺杆摄动环元件作用下分散混合性能
李秋霞12,谭寿再2,喻慧文12,杨卫波12,张志旋12,杜遥雪1,徐百平12
1.五邑大学智能制造学部,广东江门 529020; 2.广东轻工职业技术学院,广东省高分子先进加工工程技术研究中心,广州 510300 
Dispersive Mixing under Action of Perturbation Ring Elements in Co-rotating Non-twin Screw Extruder
Li Qiuxia12, Tan Shouzai2, Yu Huiwen12, Yang Weibo12, Zhang Zhixuan12, Du Yaoxue1, Xu Baiping12
1. Faculty of Intelligent Manufacturing, Wuyi University, Jiangmen 529020, China; 2. Advanced Research Center for Polymer Processing Engineering of Guangdong Province, Guangdong Industry Polytechnic, Guangzhou 510300, China 
摘要:针对转速比为1∶2的同向差速双螺杆,提出了一种新型摄动环元件强化分散混合。在自行研制的可视化实验样机上,开展等速双螺杆和差速双螺杆挤出实验研究。采用浓度为1.5%的羧甲基纤维素钠溶液作为模拟的黏弹流体,注入红色油性色浆模拟不相容示踪液滴,出口采用与挤出速度同步的拉膜法采集实验流体,使用高速高精度相机记录混合过程和出口薄膜上的混合图像。针对不同螺纹构型、不同转速及不同示踪剂初始位置,在螺槽全充满输送情况下,研究混合过程和出口示踪剂液滴分散混合。可视化实验结果表明,两种螺纹构型具有相似的示踪液滴破裂机制,液滴经过螺棱与机筒间隙时,在缩颈作用下实现大尺度分离;新型差速摄动环元件在上下啮合区存在不对称的台阶结构,折叠拉伸现象更加显著。即使摄动环元件转速比传统双螺杆低,新型摄动环元件仍然具有更优异的分散混合能力,而且转速越高,液滴分散混合的优势越显著。摄动环元件同样表现出混合对初始位置的敏感性,从单头螺杆位置出发的示踪剂液滴分散更均匀。 
Abstract:Regarding the dual-speed co-rotating non-twin screw geometries with the speed ratio of 1∶2, a new type of perturbation ring element was proposed to enhance the dispersive mixing. On the self-developed visual experimental prototype, the experimental investigations on a co-rotating twin extruder and a dual-speed extruder were carried out. Using sodium carboxymethyl cellulose solution (NaCMC) of concentration 1.5% as the simulated viscoelastic fluid, and a drop of the red oily colorant injected as an incompatible tracer droplet, a pulling film at the speed equal to the extrusion speed was used to collect extrudates, and then high-speed cameras with high-precision were adopted to capture the mixing process and the mixing patterns on the pulling film. For different screw elements, rotation speeds and initial tracer positions, the mixing process and the dispersive mixing of the exit tracer droplets were studied under the full-filled conditions of screw channels. Visualization experiment results showed that the two kinds of screw elements shared the similar droplet breakup mechanism. When the droplets passed through the gaps between the flights and the barrel, the necking effect resulted in large-scale breakup; the alternating asymmetric step structures appeared in the upper and bottom intermeshing regions of the perturbation ring elements, which led to more folding and larger stretching action.Even if the rotation speeds of the perturbation ring element couple were lower than those of the traditional twin screw element, the new perturbation ring elements still achieved more excellent dispersive mixing. Moreover, the higher the rotation speed, the more significant the advantage of droplet breakup. The perturbation ring element also followed the sensitivity of mixing to the initial positions, and a droplet released from the single-tip screw side experienced more uniform dispersion. 
关键词:同向差速双螺杆;摄动环元件;拉膜法;可视化 
Keywords:co-rotating non-twin screw extruder; perturbation ring element; pulling film method; visualization 
基金:国家自然科学基金项目(11972023,11272093),广东省基础与应用基础研究基金联合基金项目(2019A1515110316) 
本文引用格式:
李秋霞,谭寿再,喻慧文,等.同向差速双螺杆摄动环元件作用下分散混合性能[J].工程塑料应用,2021,49(6):72-77,83.
Li Qiuxia,Tan Shouzai,Yu Huiwen,et al. Dispersive mixing under action of perturbation ring elements in co-rotating non-twin screw extruder[J]. Engineering Plastics Application,2021,49(6):72-77,83. 

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