Real-Time Monitoring of Pellet Plastication in a Full-Flight Screw and Kneading Disk Elements of a Co-Rotating Self-Wiping Twin-Screw Extruder by Acoustic Emission (AE) Sensing

被引：2

作者：

Kida, Tsukasa ^{[1
]}

Ohara, Masatoshi ^{[2
]}

Inamori, Keigo ^{[1
]}

Nagasawa, Shogo ^{[1
]}

Kihara, Shin-ichi ^{[3
]}

Taki, Kentaro ^{[4
]}

机构：

[1] Kanazawa Univ, Grad Sch Nat Sci, Dept Nat Syst, Kanazawa 9201192, Japan

[2] Shibaura Machine, Numazu 4108510, Japan

[3] Hiroshima Univ, Grad Sch Adv Sci & Engn, Higashihiroshima 7398527, Japan

[4] Kanazawa Univ, Sch Frontier Engn, Kanazawa 9201192, Japan

来源：

POLYMERS | 2023年 / 15卷 / 05期

基金：

日本科学技术振兴机构;

关键词：

pellet plastication; acoustic emission; melt removal; twin-screw extrusion; ENERGY-DISSIPATION; POLYMER PELLETS; MECHANISMS; BEHAVIOR; MODEL;

D O I：

10.3390/polym15051140

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The plastication of pellets in a co-rotating twin-screw extruder is a significant concern for product homogeneity and stability in the plastic industry. We developed a sensing technology for pellet plastication in a plastication and melting zone in a self-wiping co-rotating twin-screw extruder. The collapse of the solid part of the pellets emits an elastic wave as an acoustic emission (AE) that is measured on the kneading section of the twin-screw extruder using homo polypropylene pellets. The recorded power of the AE signal was used as an indicator of the molten volume fraction (MVF) in the range of zero (fully solid) to unity (fully melted). MVF decreased with increasing feed rate monotonically in the range of 2-9 kg/h at a screw rotation speed of 150 rotations per minute (rpm) because of the reduction in the residence time of pellets in the extruder. However, the increase in feed rate from 9 to 23 kg/h at 150 rpm resulted in an increase in the MVF as the friction and compaction of pellets caused their melting. The AE sensor could elucidate the pellet's plastication phenomena caused by friction, compaction of pellets, and melt removal in the twin-screw extruder.

引用

页数：13

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