| 摘要 |
A process and an apparatus are described for adding additives during the conditioning of animal feed. The feed is transferred from a container (1) into a conditioner (3) via a feed screw (2) at an inlet point (M). In the conditioner (3), the feed is transported by a mixing screw (12) from an inlet point (M) along a path (A) to an exit point (N), and is exposed to vapor in the course of this. One or more additives (5) which are introduced into the conditioner (3) through one or more ports (10) are added to the feed which, has passed through x% of the path (A) in the conditioner (3). The feed and the additives (5) added through one or more ports (10) are mixed on the remaining (100-x)% of the path (A) to form a mixture (6). The mixture (6) leaving the conditioner (3) at the exit point (N) is transferred to a pelleting press (7), where the mixture (6) is formed into pellets (8). The pellets (8) are finally transferred to a cooling device (9). The additives, in particular enzymes, vitamins, carotenoids and antibiotics, are not added to the main feed components until toward the end of the conditioning step. In this manner, these relatively heat-labile substances are exposed to elevated temperatures only for a relatively short time and experience much less stress than would be the case for complete passage through the conditioning unit.
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