Two main phenomena have been emphasized: (a) The transient nature of plastication during periods of screw rotation ("screwback") in comparison with the similar process in continuous extrusion. (b) The significant amount of melting produced by thermal conduction from the barrel while the screw is not turning.
Source: wiktionary
But in the open (screwback) position, the plastic must progress through a series of labyrinths which produces a more turbulent flow.
Source: wiktionary
Screwback time is a limiting factor when the plastication rate of the machine is too small or if the cooling time is small, as is the case with thin-walled mouldings.
Source: wiktionary
The clip was a variation of the screwback; today, many persons who cannot wear pierced earrings choose clips as an option.
Source: wiktionary
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