| The optical sorting system separates white from colored cullet to be melted in light-tint batches. |
| To ensure a continuous supply of material for the melting furnace, a reliable level measurement is required in the cullet silos. |
| It should be noted, however, that signs of saturation of the market for collected cullet have been reported. |
| Colour-sorted glass is crushed and sold to glass manufacturers as cullet, an essential ingredient in glassmaking. |
| They can be traced by cullet heaps and broken-down furnaces, and by their names, often mutilated, recorded in parish registers. |
| The activity data of the products relate to gross production including rejected products and cullet from the kilns and shipment. |
