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浙江大学学报(工学版)
浙江大学学报(工学版)  2020, Vol. 54 Issue (8): 1474-1480    DOI: 10.3785/j.issn.1008-973X.2020.08.004
机械工程     
注射成形中聚合物熔体黏度的在线测量装置
张剑锋1(),赵朋1,*(),周宏伟2,傅建中1,陈子辰1
1. 浙江大学，浙江省三维打印工艺与装备重点实验室，浙江 杭州 310027
2. 泰瑞机器股份有限公司，浙江 杭州 310018
On-line measurement device for viscosity of polymer melt during injection molding process
Jian-feng ZHANG1(),Peng ZHAO1,*(),ZHOU Hong-wei 2,Jian-zhong FU1,Zi-chen CHEN1
1. Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
2. Tederic Machinery Co. Ltd, Hangzhou 310018, China
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摘要：

设计并制造在线测量注射成形过程中聚合物熔体黏度变化的装置. 在测量装置中，非等温高剪切流变模具的型腔结构设计成厚度为1 mm或2 mm的狭缝，底部不封口，维持熔体的持续流动；在流动中心线上沿流动方向布置一组压力传感器实时检测聚合物熔体在模具型腔中的压力变化情况，并使用模温机控制模具温度. 使用PXIe采集系统采集、显示、记录实验数据. 实验通过压力传感器测量得到不同位置熔体压力，根据修正的牛顿黏性定律计算熔体黏度，并与Cross-WLF模型的理论值进行对比. 实验结果表明：所设计的模具安全可靠，可获得低密度聚乙烯(LDPE)熔体在注射成形过程中熔体压力的变化情况，从而可以计算出材料在成形过程中的表观黏度演化情况. 实验测量结果与理论值在剪切速率大于500 s?1的高剪切速度范围内较吻合，误差均在18%以内，最小为4%. 该装置能满足真实成形条件下聚合物熔体信息的在线检测要求.
关键词： 聚合物;  注射成形;  流变;  模具;  黏度;  在线检测    
Abstract:

A device for measuring the viscosity of the polymer melt during injection molding process was designed and manufactured. The cavity of this non-isothermal and high-shear rate rheological mold is designed as a slit with a thickness of 1 mm or 2 mm. The bottom is un-sealed and the continuous flow of polymer melt can be maintained. The pressure sensors are mounted along the central line of flow direction, thus the melt pressure in the mold cavity can be real time detected. The mold temperature is controlled by the mold temperature machine. A PXIe acquisition card is utilized to acquire, display and record the experimental data. The melt pressure at different locations is measured by pressure sensors. The melt viscosity was calculated according to the corrected law of Newton's shear stress theorem and compared with the theoretical value of the Cross-WLF model. Results show that the designed mold is safe and reliable, and the melt pressure of the low density polyethylene (LDPE) can be detected during the injection molding process. Further, the apparent viscosity evolution of the material during injection molding process can be calculated. Experimental results agree well with the theoretical values in the high shear rate range with the shear rate greater than 500 s?1, the error is within 18%, and the minimum is 4%. This proposed device can realize the online measurement of the melt information during injection molding process.
Key words: polymer    injection molding    rheology    mold    viscosity    on-line measurement
收稿日期: 2019-07-04 出版日期: 2020-08-28
CLC:  TQ 320  
基金资助: 国家自然科学基金资助项目（51635006，51875519）；浙江省自然科学基金重点资助项目（LZ18E050002）；浙江省重点研发计划资助项目（2020C01113）
通讯作者: 赵朋     E-mail: 21725029@zju.edu.cn;pengzhao@zju.edu.cn
作者简介: 张剑锋(1994—)，男，硕士生，从事聚合物注射成形研究. orcid.org/0000-0001-7362-1252. E-mail： 21725029@zju.edu.cn
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引用本文:

张剑锋,赵朋,周宏伟,傅建中,陈子辰. 注射成形中聚合物熔体黏度的在线测量装置[J]. 浙江大学学报(工学版), 2020, 54(8): 1474-1480.

Jian-feng ZHANG,Peng ZHAO,ZHOU Hong-wei ,Jian-zhong FU,Zi-chen CHEN. On-line measurement device for viscosity of polymer melt during injection molding process. Journal of ZheJiang University (Engineering Science), 2020, 54(8): 1474-1480.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2020.08.004    或    http://www.zjujournals.com/eng/CN/Y2020/V54/I8/1474

图 1  流变模具型腔结构与压力传感器布置示意图
图 2  流变模具总体结构示意图
图 3  聚合物熔体黏度检测系统的总体架构示意图
图 4  模温机设置100 °C油温时，不同注射速度下压力变化情况
图 5  模温机设置120 °C油温时，不同注射速度下压力变化情况
图 6  不同温度和注射速度下测点压力峰值的变化情况
图 7  型腔厚度为1 mm时不同模具温度下熔体的黏度曲线
图 8  型腔厚度为2 mm时不同模具温度下熔体的黏度曲线
图 9  型腔厚度为1 mm时修正后的熔体黏度曲线
图 10  型腔厚度2 mm时修正后的熔体黏度曲线
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