Wet Hopper Destoner with Stone Lock

  • Description
  • Key Features
  • Brochures
  • The Wyma Wet Hopper Destoner allows produce to be quickly tipped from a bin, truck or other device into a water-filled tank without fear of damage. It also removes stones and clods in the early stage of processing. Wet Hopper Destoners can receive produce in dirty, clean or semi-clean condition. It can be used with potatoes, carrots, parsnips, turnips, swedes and beetroot (beet) etc...

    Once into the Wet Hopper Destoner, fresh produce gently travels on a web conveyor belt towards an out-feed elevator. While in the Wet Hopper Destoner, fine sand and dirt are separated from the produce and fall through the web belt into collection hopper(s) in the base of the tank. The accumulated debris is periodically removed via the purge valves underneath (manual or automatic operation depending on option selected).

    An optional air agitation system is also available. The air bubbling to the surface agitates the vegetables causing them to gently rub against each other, helping to soften and remove the mud. It also helps to break up clumps of produce.

    The double purge valve system discharges stones and clods via a holding chamber at the base of the Wet Hopper Destoner. The stone removal system works by pumping water at a pre-determined flow rate up through a space between the base conveyor and the elevator. Due to inherent differences in density, produce simply float over the space, with the help of the upward water flow; whilst stones, rocks and dirt clods sink and are ejected from the Wet Hopper Destoner via the stone lock system. The system is pneumatically actuated and stone and clods are removed on a discrete basis at regular intervals. The frequency of the stones and clods removal can be established according to your operating conditions.

    The produce is gently lifted out of the hopper via an elevator with gooseneck. The throughput of the line (t/hr) is determined by the elevator speed selected (5 options available) whereas the soaking time of produce in the water is determined by the actual holding capacity of the Wet Hopper. As the produce exits the Wet Hopper, additional spray bars can be fitted to provide a final rinse before moving on to other equipment in the processing line.

    The Wet Hopper adds four main benefits to a processing line:

    • It acts as a pre-soak and dirt/rubbish collection facility, ensuring that this material is not transferred to the other equipment downstream.
    • It removes stones and clods from bulk vegetables received directly from the field.
    • It provide even flow delivery from intermittent supply.
    • It creates a temporary storage of produce that is waiting to be sent to the next part of the processing line.
    • It provides gentle handling of produce as the fresh produce is tipped into a water-filled tank.


    Model Width Length of tank
    HWS0400 2230 mm 4745 mm
    HWS0600 2230 mm 6245 mm
    HWS0800 2230 mm 7745 mm
    HWS1000 2230 mm 9245 mm
    HWS1200 2230 mm 10745 mm

    • Durable, robust design with stainless steel construction (except for base frame)
    • Air agitation for improved dirt removal while maintaining gentle vegetable washing*
    • Water spray bars to remove remaining solid and floating debris from vegetable before exiting hopper*
    • Easy access for cleaning and maintenance with access hatches
    • Gooseneck configuration on out-feed elevator for a gentle transition to downstream equipment in the processing line
    • Rubber coated web bars for gentle vegetable handling
    • Conveyor / out-feed elevator lifts out of the hopper to allow for easy cleaning, servicing and maintenance
    • Variable speed control of out-feed elevator*
    • Built-in self-cleaning bars to flush away hard to reach dirt and reduce cleaning and maintenance time and cost
    • Self-cleaning with soil collection hopper(s) and manual or automatic *discharge valve(s).
    • Out-feed sides of the Wet Hopper Destoner have a smooth curved shape allowing for an effective flow of produce onto the out-feed elevator.
    • Water jets placed at the back of the tank to assist with flow of floating produce along the tank*


    * Optional

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Wyma will work closely with you to provide a unique post-harvest handling solution tailored to your needs, to your produce, to your operating, business and physical environments.

Hear how Wyma and Steven Moffatt worked together on the carrot wash line at Moffatt Fresh Carrots in Australia.

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