The loss scale hopper is roughly filled, usually to the maximum. Then the balance-hopper is gradually emptied via a vibrating feeder (screw, etc.) to the required loss.
These scales are in principle one-component. In addition to very fine materials (graphite), small materials (glass shards, gravel, etc.)
In the picture are:
- small graphite scale filled with a screw conveyor, emptied by a vibrating belt conveyor,
- large shard scales, which are roughly filled, usually to the maximum and then gradually emptied according to the prescription.
The square hopper is usually lined against shard abrasion or contains ribs that catch the shards so that they slide on their own
- The last cullet scale is a hopper standing on a loadcell bridge scale.