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The Solids Conveying Mechanism for Helically Grooved Single-screw Extruders

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Journal of Wuhan University of Technology(Materials Science) 2013年第4期28卷 693-700页

作者：潘龙 jia mingyin 薛平 JIN Zhiming Institute of Plastic Machinery and Engineering Beijing University of Chemical Technology

A novel particle-size conveying model was established to examine the effects of the dimension relationships of the groove depth and particle size on the solids conveying mechanism of the helically grooved feed section. In the model, one or two shear interfaces were proposed based on the dimension relationships of the groove depth and particle size, and the solid-plug embedded in the groove and screw channel were divided into two or three layers by the shear interfaces to consider the solids conveying mechanism of each layer by the boundary condition equation for positive conveying. By the particle-size model, the effects of different dimension relationships on the transformation of solids conveying mechanisms between the friction-drag conveying and the positive conveying were discussed and compared with the on-line measuring experimental data. The results showed that the shear interfaces among the solids existed indeed and the dimension relationships determined the conveying mechanism and the throughput of helically grooved extruders, which was well confirmed by the excellent consistence between the predicted and measured data.

关键词： solids conveying particle-size model positive conveying shear interface helical grooves

Improvement of Mechanical Properties of Wood-Plastic Composite Floors Based on the Optimum Structural Design

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Acta Mechanica Solida Sinica 2016年第4期29卷 444-454页

作者： Yang Zhang Ping Xue Yun Ding mingyin jia jianchen Cai Xiaoming Jin College of Mechanical and Electrical Engineering Beijing University of Chemical Technology College of Mechanical Engineering Quzhou University

A study is carried out on the structural design of wood-plastic composite floors. The geometric parameters of the cavities, the structure, and the means to optimize the performance of these light boards are investigated. Various structural parameters of the boards, such as size, shape, and the pattern of cavities are also studied. The optimal structure can be determined by calculation and analysis of the strength, stiffness, weight and cost of the material. A finite element model for the mechanical analysis of wood-plastic composite floors is established; and the results are used to verify the strength criteria under bending deformation, which is the most common loading condition of flooring board.

关键词： wood plastic composite cavities flooring board optimal structure the finite element model

Improvement of Mechanical,Dynamic-Mechanical and Thermal Properties for Noil Ramie Fiber Reinforced Polyethylene Composites

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Transactions of Nanjing University of Aeronautics and Astronautics 2016年第1期33卷 121-128页

作者： Zhang Yang Xue Ping Ding Yun jia mingyin Shi Zhenwei Wang Hao Institute of Plastic Machinery and Engineering Beijing University of Chemical Technology Centre of Excellence in Engineered fiber Composite University of Southern Queensland

Noil discarded fibers from fiber production for textile industry have short length and are always considered less ***,noil ramie fibers/HDPE composite is prepared using twin-screw extruder and the dynamic mechanical and thermal properties are *** influence of ramie fiber and maleic anhydride-grafted polyolefin(MA-g-PO)on mechanical,dynamic mechanical and thermal properties is *** is observed that the tensile,flexural and impact properties of the composites treated with MA-g-PO are all improved in comparison to the untreated *** mechanical properties of the composite with MA-g-PO show an increase in the storage modulus with a higherαrelaxation peak,together with the micromorphology analysis,indicating an improved interfacial bonding between fiber and matrix by the MA-g-PO ***,the change in TGA thermograms of composite caused by MA-g-PO exhibits that the addition of MA-g-PO is also helpful to increase the thermal stability of noil ramie fiber/HDPE composites.

关键词： noil ramie fiber high density polyethylene(HDPE) mechanical properties MA-g-PO natural fi ber composites

Creep Behaviour of Wood Flour/Poly(vinyl chloride) Composites

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Journal of Wuhan University of Technology(Materials Science) 2009年第3期24卷 440-447页

作者：贾明印王克俭 Institute of Plastics Machinery and Engineering Beijing University of Chemical Technology

The experimental creep data were focused on wood-flour （WF）/poly vinyl chloride （PVC） composites with the variations in additive concentrations of wood flour, silane coupling agent, organomodified montmorillonite （OMMT） and nano-cacium carbonate （nano-CaCO3）. Their effects were analyzed using the Four-element Burger Model incorporating microscopic mechanisms. Total creep strain was low with increasing WF while elastic strain was high and plastic flow strain was low in modeling. Modification of WF with silane was beneficial to creep resistance, so did adding low ratio of OMMT （1.5 wt%） and nano-CaCO3 in composites. Thus, it was effective in reducing creep either by stiffening the PVC matrix using rigid nano-particles or by improving their adhesion with resin. However, superfluous quantity of any additament did not benefit the improvement owing to either earlier destruction of their agglomerates or stress-concentrated cracks in the over-incrassated interface.

关键词： composite creep wood flour poly (vinyl chloride) nano-particle

RTM成型玻璃纤维增强阴离子聚合尼龙6复合材料及其性能

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复合材料学报 2021年第2期38卷 414-423页

作者：孙华薛平陈轲贾明印北京化工大学机电工程学院北京100029

针对己内酰胺阴离子聚合反应特性,通过自行设计的适合该反应体系的树脂注射成型机和搭建的热塑性树脂传递模塑(T-RTM)成型实验平台,在恒压注射条件下,成功地制备了玻璃纤维(GF)体积分数高达48vol%的GF增强阴离子聚合尼龙6(APA-6)复合材... 详细信息

针对己内酰胺阴离子聚合反应特性,通过自行设计的适合该反应体系的树脂注射成型机和搭建的热塑性树脂传递模塑(T-RTM)成型实验平台,在恒压注射条件下,成功地制备了玻璃纤维(GF)体积分数高达48vol%的GF增强阴离子聚合尼龙6(APA-6)复合材料。研究了不同进料方式和压力、模具温度和纤维含量等工艺条件对GF/APA-6复合材料制品的表观质量、结晶度、热变形温度和力学性能的影响。结果表明,采取真空与加压相结合的进料方式并保持一定的溢流量,当注射压力在0.5~1.0 MPa时可以得到表面无缺陷、性能优异的制品;在模具温度为150℃时,GF/APA-6复合材料的弯曲强度和模量最高,分别达到682.7 MPa和24.4 GPa;而在180℃时,复合材料的层间剪切强度最高可达62.3 MPa。

关键词：尼龙6 阴离子聚合复合材料工艺参数热塑性树脂传递模塑成型力学性能

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PVC复合板材的研究进展

塑料 2018年第2期47卷 79-83页

作者：关玥贾明印薛平北京化工大学塑料机械及塑料工程研究所北京100029

随着木材资源的短缺,"以塑代木"成为一种必然的趋势。PVC由于其价格低廉、性能优异,制品应用广泛,尤其是PVC复合板材。PVC复合板材因具有轻量化、功能化、结构化等优势,在工业领域和家庭应用中随处可见,具有广阔的应用前景。文章主要从... 详细信息

随着木材资源的短缺,"以塑代木"成为一种必然的趋势。PVC由于其价格低廉、性能优异,制品应用广泛,尤其是PVC复合板材。PVC复合板材因具有轻量化、功能化、结构化等优势,在工业领域和家庭应用中随处可见,具有广阔的应用前景。文章主要从共混复合、共挤复合、转印复合、夹芯复合这4个方面介绍了国内外PVC复合板材的研究成果,阐述了共混复合实现资源高质化利用、降低成本的途径,分析了ASA与PVC、PMMA与PVC共挤复合的工艺及设备,介绍了国内外转印复合的研究进展,概述了PVC夹心复合板材的类型、制备方法及应用。未来PVC复合板材质量更轻,功能性更强,结构更加合理,将更适应市场发展的需求。

关键词： PVC复合板材共混共挤转印夹芯

长玻纤增强ASA/PVC夹芯复合板材的制备及性能

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塑料 2019年第3期48卷 118-122页

作者：关玥贾明印薛平北京化工大学塑料机械及塑料工程研究所

采用在线混配法制备了长玻纤增强 ASA 复合片材和夹芯复合板材。通过实验制备了不同玻纤含量长玻纤复合片材时,双螺杆挤出机的主机转速、喂料转速及纤维束数。研究了制备工艺对片材性能的影响,采用微观电镜分析了接枝料及玻纤含量对片... 详细信息

采用在线混配法制备了长玻纤增强 ASA 复合片材和夹芯复合板材。通过实验制备了不同玻纤含量长玻纤复合片材时,双螺杆挤出机的主机转速、喂料转速及纤维束数。研究了制备工艺对片材性能的影响,采用微观电镜分析了接枝料及玻纤含量对片材力学性能的影响,并通过残余玻纤长度的测量分析了片材力学性能与玻纤长度之间的关系。通过工艺优化,将长玻纤增强 ASA 片材热覆于 PVC 发泡板的表面,快速冷压成型,制备了长玻纤增强 ASA/ PVC 夹芯复合板材,得到了不同面层对复合板材弯曲、冲击等力学性能的影响。结果表明,当长玻纤含量为 20%时,制备的夹芯复合板材的性能最佳,其弯曲强度、弯曲模量均达到Ⅱ类强度实芯建筑模板用木塑复合板的标准。

关键词：玻纤增强 ASA 复合片材 ASA/PVC 夹芯复合板材在线混配微观性能力学性能

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树脂基复合材料拉挤成型研究进展

中国塑料 2019年第1期33卷 116-123页

作者：陈轲薛平孙华贾明印北京化工大学机电工程学院北京100029

简要综述了用于拉挤成型的热固性和热塑性聚合物种类和成型工艺,详细论述了数值模拟在拉挤成型理论分析建模和工艺参数优化等方面的研究进展。此外,还介绍了几种新型拉挤成型技术,包括编织-缠绕-拉挤成型技术、弯曲拉挤成型技术等。连... 详细信息

简要综述了用于拉挤成型的热固性和热塑性聚合物种类和成型工艺,详细论述了数值模拟在拉挤成型理论分析建模和工艺参数优化等方面的研究进展。此外,还介绍了几种新型拉挤成型技术,包括编织-缠绕-拉挤成型技术、弯曲拉挤成型技术等。连续纤维增强热塑性复合材料具有可再加工性、环保可回收等特点,在拉挤成型领域有着广阔的发展前景。

关键词：纤维增强复合材料拉挤成型研究进展

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耦合双槽单螺杆挤出机停留时间研究

中国塑料 2016年第7期30卷 96-101页

作者：金晓明薛平贾明印北京化工大学塑料机械及塑料工程研究所北京100029 北京联合大学机电学院北京100020

提供了一种全新的分析挤出机停留时间的方法。在相同螺杆转速下,耦合双槽单螺杆挤出机物料的停留时间低于传统光滑机简单螺杆挤出机和螺旋沟槽IKV单螺杆挤出机;耦合双槽单螺杆挤出机可以有效提高挤出机的熔融效率,实现高固体输送产量下... 详细信息

提供了一种全新的分析挤出机停留时间的方法。在相同螺杆转速下,耦合双槽单螺杆挤出机物料的停留时间低于传统光滑机简单螺杆挤出机和螺旋沟槽IKV单螺杆挤出机;耦合双槽单螺杆挤出机可以有效提高挤出机的熔融效率,实现高固体输送产量下的熔融效率与固体输送效率的匹配。

关键词：停留时间熔融理论沟槽挤出机