| 摘要 |
The method for producing an expanded, shaped pellet products with an annular cavity includes extruding a mixture to form a tubular extrudate. This is formed by extruding dough around and through a die insert having one or more sources for injecting air, other inert gas, or liquid into an annular cavity into a portion of the tubular extrudate. After exiting the extruder, the shaped extrudate initially expands at it exits the extruder die but is then stretched so as to substantially return the extrudate to an unexpanded state. Thereafter, the stretched extrudate is cut into shaped pellets with annular cavities. Upon being further heated, for example, in a hot air puffer, the pieces are puffed to produce expanded, shaped snack products with annular cavities without the need for a dehydration and/or conditioning step.
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