Abstract: Vegetable snacks without fat are produced by placing sliced objects such as potato slices (3) on a net belt (1) in a single layer and by first carrying them through a pre-drying zone (5) and then a treatment zone (6) where the potato slices are puffed. The puffed potato slices (3') are then carried to a post-drying zone (7) and conveyed through same by a belt (2) whereafter the finished potato chips (3") are packed. In all heating zones (5,6,7) there may be used heating elements (4) treating the potato slices with infrared heat radiation, if desired, by two-sided treatment by further heating elements or reflectors (10).