Valve bags are widely used in automated packaging lines in the food industry – especially for products such as cornstarch – because they offer many advantages in terms of storage and handling. However, defective bags or bag valves repeatedly cause significant disruptions in the filling process.
A common scenario: The valve sticks to the bottom of the bag and cannot be opened correctly automatically during filling. As a result, the bag cannot be filled completely or at all. This leads to product losses, dust contamination, additional cleaning effort – and ultimately an unnecessarily high proportion of rejects.
GREIF-VELOX expanded the BVPV 4.40 to include the high-precision ValvoDetect sensor system, which works in two test stages:
- Variant Save: Even before the filling process, optical sensors check whether the bag valve has been opened correctly as soon as the bag sits on the spout. Faulty bags are ejected immediately.
- Variant Clean: Before the sealing process, ValvoDetect ensures that the bag is positioned exactly between the sonotrode and anvil. Incompletely positioned bags are also sorted out so that only perfectly sealed bags are placed on the pallet.
Case study AKD Toftlund
The example at AKD Toftlund in Denmark shows just how big the difference can be. There, the use of ValvoDetect and the optimization of the bags used reduced the reject rate from 0.8% to just 0.04% – a saving of 95%.
Read more about this in the detailed case study.