Page 75 - 《橡塑技术与装备》2021年12期（6期下半月 塑料）

产品与设计 张磊 等·同向双螺杆挤出机下落机头的流道设计

图 5 出口截面 PP 熔体的剪切速率场

熔体流动比较均匀，有利于挤出质量较好的制品。 图 6 机头模板中心孔和最外围孔熔体速度分布的比较
参考文献 ；
[1] 田卫东，梁晓刚 . 聚丙烯熔喷无纺布专用料挤出设备及工艺研 拟研究 .2015 全国仿真技术学术会议 .
[3] 时俊峰，黄志刚，蒋卫鑫，等 . 聚乳酸在啮合同向双螺杆挤出
究 . 橡塑技术与装备，2016, 42(2):60-62
机机头过渡体的流场研究 . 食品与机械，2017,01:72-75.
[2] 苏新，黄志刚，李梦林，等 . 双螺杆挤出机齿形盘元件数值模

Runner design of drop head of co-rotating twin screw extruder

Zhang Lei , Xue Kai , Li Haiming 2
1
1
(1. Tianhua Institute of Chemical Machinery & Automation Co. LTD., Lanzhou 730060, Gansu, China;
2. Sinopec Yizheng Chemical Fibre Co. LTD., Yizheng 211900, Jiangsu, China)

Abstract: In this paper, the flow process of PP melt in the head runner of co-rotating twin-screw extruder
was numerically simulated by using POLYFLOW software. The pressure field, velocity field, shear rate field and
viscosity field of the melt in the head runner were numerically calculated. The flow process of PP melt in the
runner was statistically analyzed by using the example tracing method. The results showed that due to the
unreasonable design of the original head runner, the melt distribution at the exit of the head is not uniform,
which shows that the velocity of the central hole is large and that of the two sides is small. The improved head
overcomes this problem. The melt flow at the exit of the head is more uniform, which can ensure the quality of
the extruded products.
Key words: twin-screw extruder; drop head; PP; POLYFLOW
(R-03)

年
2021 第 47 卷 ·53·