extruded, a virtual prototype of the instrument is designed by using a
parametric CAD software, CATIA V5R19 (a CAD section of the extrusion
die is represented in Fig. 8). The extrusion die is rigidly linked to the
nozzle by a bolted coupling. Furthermore, two elastic threads, made of
nylon, protrude through the inner part of the nozzle. The hole of the
die, having a diameter equal to 10mm, is characterized by the presence
of ten helical grooves. This geometry induces the paste to take a cylindrical
shape and, at the same time, imposes a twist around the longitudinal
axis. This rotation is done by covering a defined angular amplitude
which is the function of themixture feed rate and the geometric parameters
of the grooves.
extruded, a virtual prototype of the instrument is designed by using aparametric CAD software, CATIA V5R19 (a CAD section of the extrusiondie is represented in Fig. 8). The extrusion die is rigidly linked to thenozzle by a bolted coupling. Furthermore, two elastic threads, made ofnylon, protrude through the inner part of the nozzle. The hole of thedie, having a diameter equal to 10mm, is characterized by the presenceof ten helical grooves. This geometry induces the paste to take a cylindricalshape and, at the same time, imposes a twist around the longitudinalaxis. This rotation is done by covering a defined angular amplitudewhich is the function of themixture feed rate and the geometric parametersof the grooves.
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