When cellulose solutions are ejected through a thin opening
at a high velocity, a constant stream is obtained instead of
droplets. By passing this stream through a rotating knife
apparatus, it can be cut into spherical particles, which
subsequently fall into a coagulation bath (jet cutting).31,32
Thereby, ejection and cutting of the stream may also be
performed directly into the coagulation medium (underwater
pelletizing).33 Using these techniques, the size and shape of the
beads can be controlled by the ejection speed, diameter of the
jet nozzle, and geometry and rotation speed of the knife.34 In
addition to the above-described procedures, spraying techniques
have also been applied for obtaining fine spherical
When cellulose solutions are ejected through a thin openingat a high velocity, a constant stream is obtained instead ofdroplets. By passing this stream through a rotating knifeapparatus, it can be cut into spherical particles, whichsubsequently fall into a coagulation bath (jet cutting).31,32Thereby, ejection and cutting of the stream may also beperformed directly into the coagulation medium (underwaterpelletizing).33 Using these techniques, the size and shape of thebeads can be controlled by the ejection speed, diameter of thejet nozzle, and geometry and rotation speed of the knife.34 Inaddition to the above-described procedures, spraying techniqueshave also been applied for obtaining fine spherical
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