Large flexible bags with capacities of up to 1.5 t are the principal m
eans of exporting oil well cements at Dyckerhoff AG's Lengerich cement
works. The so-called Big Bags are filled in a modern twin-spout syste
m in which the bags are weighed while suspended. A coarse and fine flo
w control system is achieved by special flat slide valves. Up to 1200
t cement can be bagged per day in three-shift operation, which gives s
ubstantially greater flexibility when compared with normal bagging in
paper bags.