| 摘要 |
A rendering method involves heating the animal protein and thereafter feeding the heated animal protein through a rendering screw press machine having an internal shaft assembly that includes a working portion with an overall compression ratio of greater than about 7 to 1, a first scroll flight section configured for decreasing cake thickness, followed by a first high compression cone section, followed by a stepped decompression section, followed by a second scroll flight section configured for decreasing cake thickness, followed by a second high compression cone section, followed by a straight collar section. Rotating the shaft assembly moves the heated animal protein through the machine such that liquid fat passes out through a barrel cage and substantially dried animal protein cake is output from the choke opening, and the heated animal protein only undergoes one stepped decompression during such movement. |
