The effect of the design elements of screw and technological parameters on the plasticization quality in the extrusion process

Influence of the Design Elements of the Screw on the Characteristics of Film Extrusion Blow Moulding

“…Increase in the rotary speed of the screw, regardless of the value of δ, contributes to an increase in the mass flow rate of the material (Figure 4), pressure of the material before the head ( Figure 5) and unit consumption of energy supplied to the drive system of the extruder (Figure 6), and to a decrease in the component of the energy efficiency of the extruder (from its drive system) (Figure 7). The nature of the changes in the aforementioned quantities is in agreement with data in the literature [4,9,11,18].…”

“…-temperature of the material before the extruder head The aforementioned component of the energy efficiency of the extruder is a consequence of adopting, for analysis of the test results, the unit consumption of energy supplied to the drive system of the extruder, defined as the ratio of the power of the drive system to the flow rate of the material [9,[22][23][24][25].…”

“…The results of investigations of vertical-up extrusion with free blowing, concerning, among other things, certain energy problems and the influence of a grooved section of the extruder barrel on the main characteristics of the extrusion process, are given in the literature [16][17][18]. The results of investigations relating to the effect of selected design elements of the screw and of the process parameters on the quality of plastication of the material have also been published [9,19]. A relatively new work [20] dealing with problems in the production of articles by extrusion blow moulding gives hardly any information concerning the extrusion blow moulding of tubular film.…”

“…Elements for which the mixing process predominates (called "intensive-mixing elements") contain regions in which the stream of flowing material is subjected to repeated dividing and recombining, with a high proportion of rotational motion of the material, leading to intensive mixing [4,9]. They are generally located on the screw in the metering zone.…”