US 12,392,701 B1
High-voltage cable insulation material continuous extrusion processing characteristic evaluation and optimization method and apparatus
Shuai Hou, Guangzhou (CN); Mingli Fu, Guangzhou (CN); Lei Jia, Guangzhou (CN); Yunpeng Zhan, Guangzhou (CN); Wenbo Zhu, Guangzhou (CN); Baojun Hui, Guangzhou (CN); Xiaolin Li, Guangzhou (CN); Lingmeng Fan, Guangzhou (CN); Yifan Zhang, Guangzhou (CN); and Bin Feng, Guangzhou (CN)
Assigned to ELECTRIC POWER RESEARCH INSTITUTE., CHINA SOUTHERN POWER GRID, Guangzhou (CN)
Appl. No. 19/104,791
Filed by ELECTRIC POWER RESEARCH INSTITUTE., CHINA SOUTHERN POWER GRID, Guangzhou (CN)
PCT Filed Dec. 6, 2022, PCT No. PCT/CN2022/136788
§ 371(c)(1), (2) Date Feb. 19, 2025,
PCT Pub. No. WO2024/087330, PCT Pub. Date May 2, 2024.
Claims priority of application No. 202211331206.3 (CN), filed on Oct. 28, 2022.
Int. Cl. G01N 11/04 (2006.01); G01N 3/24 (2006.01); G01N 11/00 (2006.01); G01N 11/02 (2006.01); G01N 11/06 (2006.01); G01N 11/08 (2006.01)
CPC G01N 11/04 (2013.01) [G01N 3/24 (2013.01); G01N 11/02 (2013.01); G01N 11/06 (2013.01); G01N 11/08 (2013.01); G01N 2011/0026 (2013.01); G01N 2011/006 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for evaluating and optimizing a continuous extrusion processing characteristic of a high-voltage cable insulation material, comprising:
at a step A1, heating a tested material to a melt at a set temperature, continuously extruding the melt through a capillary mold, continuously measuring and recording an inlet pressure P of a capillary, a mass growth rate w of an extruded melt, and a diameter D′ of a melt strip during the extrusion, obtaining an apparent shear viscosity ηa of a melt flow;
at a step A2, calculating an outlet expansion rate δ of the melt by using the diameter D′ of the melt strip;
at a step A3, recording and displaying curves ηa(t) and δ(t) of the apparent shear viscosity and the outlet expansion rate of the melt changing with time, determining time corresponding to an increase of a set percentage in the ηa(t) or δ(t) on the curve ηa(t) or δ(t) as starting time of a cross-linking reaction, which is recorded as TX′,
at a step A4, selecting a reference sample, testing the reference sample according to the steps A1 to A3, and determining starting time TS of a cross-linking reaction of the reference sample according to the curves ηa(t) and δ(t) of the reference sample;
at a step A5, defining an index α according to the TX and TS as a digital characteristic quantity for characterizing the continuous extrusion processing characteristic of the tested material.