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KMID : 1007520010100010001
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Food Science and Biotechnology
2001 Volume.10 No. 1 p.1 ~ p.6
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Improvement in the Yukwa Manufacturing by Extrusion Process with CO2 Gas Injection
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Kang Sun-Hee
Ryu Gi-Hyung
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Abstract
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Extrusion with CO₂gas injection was used to improve the processing of a Korean traditional oily parlay, Yukwa. Co-rotating twin screw extruder was used with CO₂ gas injection valve on the barrel for formation of bubbles in the extruded pellet. CO₂ gas cooler, compressor, pressure control valve and reverse screw elements were installed to maximize the CO₂gas injection pressure. The degree of gelatiniztion of the extruded pellet was 100% under the conditions of above 105℃ barrel temperature in which the density of the fried pellet (Yukwa) was below 0.1 g/㎤. Fried pellet by CO₂gas injection had better density and texture than the non-CO₂gas injected one. It had the best quality at 10-15 ㎏/hr feed rate 105℃ barrel temperature and 300 rpm screw speed for 3 days steeped ground waxy rice.
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