Strawberry and Mushroom Punnets

Case Studies | Strawberry and Mushroom Punnets

Strawberry and Mushroom Punnets

Case Studies | Strawberry and Mushroom Punnets


Weight check with adjustment lane

Weighing line with manual adjustment track


The Challenge

A fruit and vegetable processor required a checkweighing and rejection line for punnets of strawberries and mushrooms weighing between 300 and 500 g.

The solution had to allow out-of-weight trays to be recovered and corrected while ensuring the maximum integrity of delicate products, so they could be reintroduced into the production flow with the correct weight.


The Solutions

To meet these requirements, a special weighing line with recirculating conveyors was provided, configured as follows:

  • Double conveyor system – Two conveyors, each 4.5 m long, operating in opposite directions and linked with automated roller islands.

  • Central checkweigher – With a scale interval of 1 g, capable of weighing up to 80 punnets per minute.

  • Automated rejection – If compliant, trays continue downstream to the packaging station. If non-compliant, photocells trigger a pneumatic diverter that redirects underweight trays into one lane and overweight trays into another.

  • Manual adjustment lanes – Operators stationed at the lanes can easily add or remove product to bring punnets into tolerance.

  • Recirculation system – After correction, the roller island guides all punnets back into a single row, recirculating them to the checkweigher for reinspection.


The Benefits

  • Gentle handling – Diverter rollers reject out-of-weight punnets without impact, preserving delicate produce.

  • Simple and intuitive – Operators can quickly identify and correct under- or overweight trays, maintaining production efficiency.

  • 100% control – Recirculating lanes ensure every tray is rechecked and compliant before moving forward

  • Reliable compliance – Ensures that all packaged products meet declared weights, helping avoid penalties and reinforcing quality reputation.

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