嵌套式螺杆挤出机的固相温度分布  

Temperature Distribution of Solids in One Nested Screw Extruder

作　　者：贾明印[1] 薛平[1] 王克俭[1] 朱复华[1] 

机构地区：[1]北京化工大学塑料机械及塑料工程研究所,北京100029

出　　处：《高分子材料科学与工程》2008年第12期20-24,共5页Polymer Materials Science & Engineering

摘　　要：介绍了一种新型嵌套式螺杆挤出机。在考虑离心力和物料可压缩性条件下，通过非等温模型求解了新型螺杆挤出机内外螺杆固相界面温度沿螺杆轴向和槽深方向的分布。计算结果表明，内外螺杆的固相界面温度沿轴向均按近似指数函数的规律增加，一直到固相界面温度达到熔点并出现熔膜为止，内螺杆固体输送段的长度大于外螺杆。机筒温度较高时可缩短固体输送段的长度，但不利于固体输送段压力梯度的建立。热量沿内外螺杆槽深方向传入固体床的深度都只有在15％～20％槽深的范围。A novel nested double-screw extruder with higher solid conveying capability was introduced. From the previous pressure model considering centrifugal force and solid compressibility, solid temperature of the novel extruder was predicted. Three interface temperatures exponentially vary along axial distance due to the chosen exponential function of density as pressure. The length of solid conveying zone for inner screw is longer than that of outer screw. Increasing barrel temperature shortens the length of solid-conveying zone while lowering pressure. Temperature rise predominately occurs in about one millimeter, ca. 15% to 20% of the channel depth from the outer screw surfaces or from the barrel in radial direction by heat conduction from barrel or friction with screws. Increasing barrel temperature obviously improves the solid temperature near the barrel. Inner surface temperature of outer screw is higher than those of outer surface temperature.

关 键 词：非等温 固体输送 离心力 新型挤出机 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]