Lattice Boltzmann simulation of power-law fluid flow in the mixing section of a single-screw extruder

The single-screw extruder is commonly used in polymer processing where the performance of the mixing section is significant in determining the quality of the final product. It is therefore of great interest to simulate the flow field in a single-screw extruder. In this paper simulations of non-Newtonian fluids in a single-screw extruder are performed using the lattice Boltzmann model.     

内胎φ200挤出生产线电气动力变频改造

针对原内胎φ200挤出生产线设备存在生产效率低，电能消耗高的不足，对内胎φ200挤出机电气动力系统进行改造。采用三相交流异步电机加变频器控制系统，提高了设备生产效率，降低了设备运行能耗，达到了设备经济运行的目的。     

单双螺杆挤压组织化大豆蛋白的工艺研究

研究了单、双螺杆挤压机挤压过程中温度．水分等因素对大豆组织化蛋白产品的影响，并通过正交试验法、感官评定得出最佳工艺参数。     

双螺杆食品挤压流动过程数值模拟

采用有限单元法对双螺杆食品挤压熔体的流动过程进行数值模拟.结果表明：物料熔体在流道内沿两螺旋槽环绕前进,整个过程长螺杆始终保持优先,啮合区剪切应力使物料熔体在两螺杆之间分流进而充分混合,最终转移至长螺杆后进入模具过渡段,该段熔体在螺杆头的转动影响下螺旋攀升,会形成涡流导致物料熔体滞留,是可能引起焦糊的原因.     

真空挤出机用行星齿轮减速机设计

介绍了一种真空挤出机用行星齿轮减速机,该机针对真空挤出机主传动系统的工作特点和使用要求,对输入轴结构、齿轮均载和防输出轴轴向力等关键环节进行了特殊设计。历经两年多的使用,证明该型行星齿轮减速机设计合理性能可靠。     

橡胶冷喂料挤出机螺杆参数与机头压力实用数学模型的研究

运用正交回归试验方法，在Φ橡胶冷喂料挤出机实验台上，研究了螺杆主要参数（长径比，螺旋角，螺槽深度，螺杆几何压缩比）及主要挤出工艺、物性参数（螺杆转速、机头口型，胶料种类）对橡胶冷喂料挤出机机头压力的影响。对各实验因素及实验结果做了统计分析，确定了上述各因素对冷喂挤出机机头压力影响的显著因素，得出了机头压力与螺杆及工艺、物性参数之间的定量计算数学模型。     

微波连续硫化橡胶制品的挤出口型设计

系统讨论了微波连续硫化橡胶密封条生产线的橡胶制品专用挤出口型设计的基本构思和方法步骤，并具体分析了异形挤出制品的口型设计。     

New ultra high molecular weight acrylic processing aids for rigid PVC foaming

Foaming of rigid polyvinyl chloride (PVC) is studied as a function of high molecular weight acrylic processing aids. The industrial process to evaluate quality of foam is discussed in detail. The role of acrylic processing aids to improve melt strength and hence foaming of PVC is explained. It is demonstrated that increase in molecular weight of acrylic processing aids increases its effectiveness. It is found that ultra-high molecular weight processing aids is 25%–30% more efficient than relatively lower, but still high, molecular weight acrylic processing aids. The higher molecular weight processing aids provided comparable foaming performance at lower loading levels. Foaming reduced the density of PVC compounds to 0.32–0.34 g/cm³. More than 1000% expansion is achieved in the melt extrusion process using a chemical blowing agent. Fusion characteristics are also studied. Fusion times for initial fusion peaks are in the range of 42–44 s while the fusion times of the second fusion peaks are in the range of 74–94 s. The higher molecular weight processing aids maintained fusion characteristics of PVC compounds, warranting no significant changes in commercial process.     

带捏合块的渐加速型单螺杆三维流场分析

目的:提高单螺杆挤出机的混合性能和工作效率.方法:设计了一种利用行星轮组件和混合元件的同轴渐加速单螺杆,利用Ansys/cfx对其流道进行了三维流场分析,得到了宏观压力场、速度矢量图、速度流线图以及轴向速度变化曲线并与传统单螺杆进行了对比,结果:随着螺杆转速的不断变大,物料在机筒内停留时间变短,渐加速螺杆的挤出效率得以提高20%～25%,使得耗能大大减少,由于捏合块的存在,物料在捏合块处被反复挤压,使得渐加速型单螺杆在增加产能的同时混合性能又可以得到保证.结论:同轴渐加速单螺杆高速旋转的捏合块可使物料混合更充分,且能缩短物料在螺杆中的停留时间,提高产量.     

橡胶冷喂料挤出机喂料装置的性能分析

对橡胶冷喂料加料装置进行了性能分析，通过对自由喂料，旁压辊喂料和螺旋啮合喂料的分析，得出其进料的必要条件及加料胶条的型体要求。