Melt-mixing by novel pitched-tip kneading disks in a co-rotating twin-screw extruder

Yasuya Nakayama, Eiji Takeda, Takashi Shigeishi, Hideki Tomiyama, Toshihisa Kajiwara

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)


Melt-mixing in twin-screw extruders is a key process in the development of polymer composites. Quantifying the mixing performance of kneading elements based on their internal physical processes is a challenging problem. We discuss melt-mixing by novel kneading elements called "pitched-tip kneading disk (ptKD)". The disk-stagger angle and tip angle are the main geometric parameters of the ptKDs. We investigated four typical arrangements of the ptKDs, which are forward and backward disk-staggers combined with forward and backward tips. Numerical simulations under a certain feed rate and screw revolution speed were performed, and the mixing process was investigated using Lagrangian statistics. It was found that the four types had different mixing characteristics, and their mixing processes were explained by the coupling effect of drag flow with the disk staggering and pitched-tip and pressure flows, which are controlled by operational conditions. The use of a pitched-tip effectively controls the balance of the pressurization and mixing ability.

Original languageEnglish
Pages (from-to)103-110
Number of pages8
JournalChemical Engineering Science
Issue number1
Publication statusPublished - 2011

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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