Compact, flexible and reliable: metal detector allows chocolate treats to be enjoyed safely

Key facts

The new metal detection device was to be integrated into an existing production line where the main difficulty lay in ejecting contaminated chocolate bars. Due to the construction of the production line, this could only be resolved through a telescopic belt.

Application & Product

Before the chocolate bars pass through the detection coil, they are briefly stopped by a stacking edge to sort the bars into a line. Upon detection of metal, cylinders tighten the telescopic belt after the detection area, resulting in the contaminated products falling below onto another conveyor. This is where they are then inspected by quality management.

Customer benefits
  • The compact design of the metal detector means it can be easily integrated
  • Intuitive operation
  • Reliably ejects products contaminated with foreign objects
  • The OEM solution can be fully adapted to the customer’s requirements

Weinrich produces hollow chocolate shapes and chocolate bars at its production facility in Herford. It has relied on products from the global manufacturer Minebea Intec for many years, as can be seen by the many Vistus metal detectors and the X-ray inspection system installed at various points in the production chain.

The challenge for a chocolate bar production line was to ensure reliable metal detection even with multiple bars of chocolate next to each other. With chocolate in particular, there is often a strong product effect as the shape of the bars is not always totally identical, which presents a huge challenge for a metal detector. The metal detector Vistus impresses with a wide frequency range for the ultimate detection performance and reliability and its compact design makes it perfect for integrating into existing systems. The chocolate bars are checked at Weinrich using the inspection solution before they are then packed in the next step.

The chocolate bars are sorted into a line on the conveyor belt by a stacking edge, before they go through the detection coil. If a foreign object is then detected while the products are passing through the coil, a cylinder tightens the conveyor belt, removing the contaminated batch from the production cycle through the resulting gap, it is then checked further. After the contaminated bars have been ejected, the telescopic conveyor returns to normal and production continues.

Minebea Intec’s OEM detection solution not only ensures reliable metal detection, but it is also ideal for integration into the customer’s existing production system. This meant Minebea was able to ensure a reliable process together with the customer.