同步转子密炼机填充因数的确定

在同步转子密炼机上顶栓压力、冷却水温度和转子转速一定的条件下,试验研究改变填充因数对六棱同步转子密炼机混炼性能的影响,表明六棱同步转予有很强的吃胶能力,填充因数存在最佳值。     

密炼机转子形状对胶料混炼性能的影响

通过对密炼机四棱4WH旋回流转子、新四棱4WN转子以及六棱6WI转子特征的分析,讨论这几种转子与传统的二棱转子和四棱转子在混炼性能上的差异。在实验室密炼机上,对时间、温度、转速及压砣压力等参数进行不同匹配,可得到不同性能的混炼胶。     

同步转子密炼机转子转速的确定

试验研究了在同步转子密炼机填充系数、上顶栓压力和冷却水温度一定的条件下,改变转子转速(r)后密炼机的混炼性能以及混炼胶的力学性能,表明转子转速(r)对密炼机的混炼特性有非常显著的影响;在胶料配方和其他工艺条件一定的前提下,对密炼机而言,转子转速(r)存在最佳值。     

填充系数对同步转子密炼机混炼性能的影响

试验研究在同步转子密炼机上顶栓压力、冷却水温度和转子转速一定的条件下,改变填充系数对六棱同步转子密炼机混炼性能的影响,表明六棱同步转子有很强的吃胶能力,填充系数（β）存在最佳值。     

剪切啮合型转子的混炼性能研究

介绍剪切啮合型转子的特点,并与四棱同步转子和普通啮合型转子进行不同填充因数、压砣压力、冷却水温度和转子转速下的对比试验.结果表明,混炼过程中密炼机存在最佳填充因数;相同的转子转速(低于150 r·min-1)和压砣压力下,剪切啮合型转子混炼性能较好;相同冷却水温度下,剪切啮合型转子炭黑分散性较好.     

填充系数对同步转子密炼机混炼性能的影响

研究了在同步转子密炼机上顶栓压力、冷却水温度和转子转速一定的条件下,改变填充系数对六棱同步转子密炼机混炼性能的影响。结果表明：六棱同步转子有很强的吃胶能力。填充系数（β）存在最佳值。     

密炼机转子转速对功率消耗影响的分析

对影响密炼机混炼过程的关键因素之一－转子转速进行了分析,通过实验数据对转子转速对密炼机功率消耗影响进行了探讨。     

新型二棱同步转子和功能二棱同步转子三维流场模拟

建立了新型二棱同步转子和功能二棱同步转子密炼机物理、数学和有限元模型,对密炼机流场进行有限元模拟。分析结果表明,功能二棱同步转子的混炼性能优于新型二棱同步转子。     

密炼机同步转子的三维温度场分析

利用有限元法对密炼机同步转子混炼过程中的温度分布以及变化情况进行了分析.通过对功能性二棱和同步四棱转子的温度场分析得出二者在热量传递上的优劣,并对影响换热效果的转子具体结构进行了分析,为转子构型进行优化设计提供了技术支持.     

密炼机混炼流场特性与转子参数的灰色关联研究

研究密炼机混炼流场特性与转子参数的灰色关联,进行相关优势分析和综合评价。结果表明,各转子参数对混炼流场特性的影响程度不同,长棱长度及短棱螺旋角的影响更明显。综合混炼效果最优的转子参数为:短棱长度34mm,长棱长度59 mm,短棱螺旋角39°,长棱螺旋角36°。     

串联式混炼工艺对不同填充份数白炭黑配方胶料的适应性研究

串联式混炼下游转子类型对不同白炭黑填充量混炼胶的串联式混炼过程有着不同的适应性。本文详细介绍了下游啮合转子、下游共流转子的连续混炼特点。进行了两种转子类型在不同白炭黑填充量情况下的混炼实验。分析对比实验数据,获得了串联式混炼不同下游转子类型对白炭黑填充量变化的适应性,以及白炭黑填充量对能耗、功率和混炼胶物理机械性能的影响。     

0.3L密炼机混炼工艺的实验研究

为了研究0.3L密炼机的混炼工艺参数对混炼胶性能的影响,本文采用半钢子午胎配方0°转子相位和90°转子相位下分别设置不同的工艺参数进行混炼。由混炼胶的流动性能和硫化胶的机械性能确定最佳工艺参数为:填充系数0.65、混炼时长300 s、转子转速80 r/min。     

Analysis of the Influence of Rotor Design on the Stream Flow Conditions Within an Internal Mixer

A flow visualisation apparatus is described which allows to compare different rotor designs to each other. In order to observe the distributive mixing effect, the stream flow and dispersive mixing effect is monitored by an indirect measurement of the power impact within the material. Assuming that the mixing process of an internal mixer is not continuous, a testing device was build to the scale of a 90 l kneader. In this device the mixing chamber and the rotor blade are unwound into the flat plane. With this testing device it is possible to carry out a systematic analysis of the influence of rotor design on the flow processes within an internal mixer in a fast and inexpensive way.

The test device.     

Internal mixing: A practical investigation of the influence of intermeshing rotor configuration and operating variables on mixing characteristics and flow dynamics

This paper deals with the measurement and interpretation of pressures and temperatures produced by the mixing of a rubber compound in the chamber of an internal mixer equipped with interlocking rotors. Pressure transducers and infrared/fiber optic temperature sensors were sited flush with the inner surface of the mixing chamber of a Francis Shaw KO Intermix of 2 L chamber volume. The variation of pressure with transducer position In the chamber wall and with rotor position was measured for selected fill factors and rotor speeds at “equilibrium” conditions (quasi-static power requirement for the mixer) and at intervals during a complete mixing cycle. Two rotor designs were studied. Interpretation of the results was carried out with reference to biconical rotor rheometer measurements on the mixed rubber compounds and by reference to four regimes of viscoelastic behavior identified for two-roll mill mixing. A basic flow analysis was carried out by use of the lubrication approximation in conjunction with an isothermal power-law model.     

The mastication characteristics of powdered carbon black filled natural rubber during internal mixing

Powdered carbon black filled natural rubber, P(NR/HAF), is a premixture of natural rubber and carbon black in powdered form with good carbon black dispersion throughout the rubber matrix. In this study, the mastication properties of P(NR/HAF) were observed under a wide temperature range (50–110°C) and rotor speed (30–100 rpm) range, using a mixing head attached to Brabender Plasticorder. It was found that P(NR/HAF) showed different mastication characteristic, compared to the traditional internal mastication theories of natural rubber; poor masticating properties of P(NR/HAF) are observed with low rotor speed and high temperature and a ‘‘stable zone’’ with middle rotor speed and lower temperature. The Mooney viscosity of rubber batch under different rotor speed and temperature was almost the same, and mastication properties were unsatisfactory. It was considered that the higher temperature build‐up of the mixing batch of P(NR/HAF) during the early stage of internal mixing results in the special mastication properties. A quadratic mastication model of P(NR/HAF), based on the multivariate regression analysis and stepwise regression analysis, was used to predict the mastication characters of P(NR/HAF) in internal mixer under varied temperature and rotor speed. POLYM. ENG. SCI., 2008. © 2008 Society of Plastics Engineers     

双转子混炼机中固体粉末与聚合物共混的数值模拟

利用聚合物加工分析软件POLYFLOW模拟了双转子连续混炼机中固体粉末在聚合物中的混合过程,并对不同转子转速下的三维等温非牛顿流场进行了流场和动态混合计算和统计学后处理。采用累积停留时间分布表征混合物的轴向混合性能,用团聚体累积粒径尺度分布表征固体粉末团聚体在聚合物基体中的分散状态,直观反映出团聚体在聚合物流场中粒径的变化情况,并用分离尺度分布表征混合物的分布混合性能。结果表明：在一定范围内提高转子转速有利于固体粉末/聚合物的分散、分布混合性能,确定合理的转速范围对于获得高性能聚合物复合材料至关重要。     

双转子连续混炼机混沌型转子混合性能的研究

在提出一种新型混沌型转子结构的基础上,运用Polyflow软件对其混炼过程进行三维非牛顿等温模拟,并借助于粒子示踪法对物料所经历的流场特性进行统计学分析;分析了转子结构和工艺参数对转子混合性能的影响,同时通过共混改性实验,对转子的混合效果进行了评估和表征。结果表明,高混沌型转子的分布混合能力有较大的提高,同时保持着良好的分散混合能力;混沌型转子制备的复合材料力学性能优于经典转子;转子转速的提高可以增强混沌转子的分散及分布混合能力,适当的加料速率是保证取得较好混合效果的关键因素。     

6I型转子密炼机流场瞬态流动分析

采用瞬态流场分析方法,对6I型转子密炼机的流场和转子进行分析,得到不同时刻流场速度矢量图、剪切速率云图,以及特殊点的速度与压力曲线,并对不同位置的流线进行分析。结果表明,密炼机中间混合区的流场混合不只受到棱顶的挤压作用,棱部前端产生的推进流也会促进该区域的混合;转子长棱两端的泄流作用使得棱部产生弯曲变形,这大大影响了转子棱部的应力分布;转子棱顶部的形状会很大程度影响转子工作时的轴心位置,以及棱根部的应力分布;长短棱的轴向泄流虽然不利于棱部拖拽流的形成,但是泄流对于整体的混合流动具有积极作用,中棱处能产生最多的螺旋上升流,无论位于何处都可以汇聚大量流体并引导其轴向流动。