Let’s describe the overall production process of a two-piece cardboard lid.
- First of all, the spiral winding machine wraps the paper around a tube – its diameter dependent on your request. The various layers of paper are glued together for firmness.
- Next, the paper tubes are cut into smaller rings. These are fed to the cardboard lid machine, and pre-cut disks are inserted to form lids.
- The DSO-D system then glues and shapes the lids, adding a rim to allow stacking of the end products.
Alternatively, the LFMP-STPL equipment heats, shapes and flattens the lid before adding the rim, effectively sealing the top instead of glueing it.
As described above, this is just one of many possible processes. The LFM-P machine, for instance, produces plug-in lids – the type that is pushed into composite cans. The DSO-E mechanically produces one-pieced lids, as does the servo-driven LFM-SOPL.