초록 ▼

Dough is extruded from a screw extruder through a nozzle, preferably a twin-slot nozzle, and an apertured blocking plate is placed between the tip of the extrusion screw and the nozzle assembly for making the pressure distribution across the dough in a pressure equilization chamber between the block

Dough is extruded from a screw extruder through a nozzle, preferably a twin-slot nozzle, and an apertured blocking plate is placed between the tip of the extrusion screw and the nozzle assembly for making the pressure distribution across the dough in a pressure equilization chamber between the blocking plate and the nozzle more uniform and for controlling the rate of flow of the dough towards the extrusion nozzle slots. The blocking plate has two series of parallel channels arranged on two opposed arcs of the same circle centered on the central axis of the nozzle (the axis of the extrusion screw) and the series are symmetrical about a plane of symmetry of the nozzle.

대표청구항 ▼

In an extruder wherein a dough mixture is supplied under pressure from an extrusion screw rotating about its central longitudinal axis through an extrusion head to a nozzle, said screw having a conically shaped tip, the improvement comprising: a diffuser grid mounted within said extrusion head and b

In an extruder wherein a dough mixture is supplied under pressure from an extrusion screw rotating about its central longitudinal axis through an extrusion head to a nozzle, said screw having a conically shaped tip, the improvement comprising: a diffuser grid mounted within said extrusion head and between said tip and the nozzle, wherein there is provided a pressure equalizing chamber between said grid and said nozzle, said grid having a substantially planar surface facing said nozzle and an inwardly conical surface facing said tip, the conical surface of the grid having a cone angle substantially the same as said tip and defining a compression chamber between said tip and said grid, and wherein said grid consists of two series of parallel channels, all channels located at the same radial distance from the longitudinal axis of the screw and arranged symmetrically relative to a median plane of the nozzle along opposite arcs of a single circle centered on the longitudinal axis of the screw for imparting a uniform linear speed to the strands of dough passing through the respective channels.