共查询到18条相似文献,搜索用时 171 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
根据聚甲醛的生产特点,通过研究双螺杆挤出机的脱除挥发分(简称脱挥)机理,结合聚甲醛实际生产的脱挥工艺,从螺杆组合、螺杆转速、进料量、筒体温度、螺杆长径比等方面分析了影响挤出机脱挥效率的主要因素,给出了适合聚甲醛生产的工艺参数:进料量与螺杆转速的比值维持在18~20,筒体温度为180~195℃,真空度维持在0.01 MPa以下。通过对现有挤出机脱挥系统的优化改造,使脱挥后聚甲醛中甲醛挥发量达100μg/g以下。 相似文献
10.
11.
12.
13.
14.
对橡胶弯管挤出成型规律进行了实验和理论研究并得出了应用数学模型。把偏心圆环柱域当作平行平板处理能够反映出弯管的弯曲半径与机头几何参数和物料流变参数间的应变趋势,经实验修正后的修正公式可以正确地描述它们之间的定量关系,并可作为进行计算机控制的数学模型;对于幂律流体在偏心圆环柱域中心轴向层流流动,选用双圆柱坐标进行了有限差分法数值计算,得到的弯曲半径数值计算值与实验值基本吻合。 相似文献
15.
16.
The main objective of this study was to show that an efficient removal of residual monomers is very important for in situ compatibilization of immiscible polymer blends by one step reactive extrusion. One-step reactive extrusion means that when compatibilizing two immiscible polymers with one polymer containing potential functional groups and the other being chemically inert with respect to these functional groups, functionalization of the chemically inert polymer and its subsequent interfacial reaction with the functional polymer are accomplished in a single extrusion process. Two model blend systems were chosen: polypropylene/poly(butylene terephthalate) (PP/PBT) and high density polyethylene/polyamide 6 (HDPE/PA6). A co-rotating intermeshing twin screw extruder was used to process these blends. Glycidyl methacrylate (GMA) and maleic anhydride (MA) were used to functionalize PP and HDPE, respectively. Results showed that the mechanical properties of both blends in terms of elongation at break and impact strength were improved to a much greater extent with up-stream devolatilization compared with down-stream devolatilization. 相似文献
17.
介绍国产四复合橡胶挤出机组结构形式、螺杆及驱动功率选择、四复合机头的理论力学受力分析、三维建模及有限元分析、液压系统,四复合橡胶挤出机组的参数确定、温控系统和三维集成,并将投入使用的国产四复合橡胶挤出机组与国外同类产品进行对比。结果表明,国产四复合橡胶挤出机组性能达到国际先进水平。 相似文献