A standard storage box can hold up to 1,000 kg of onions or up to 1,250 kg of potatoes.
Boxes waiting to be delivered to a client, in the forecourt of the manufacturer Poolingpartners
The outer measurements of a standard box are:
Length: 1,600 mm Width: 1,196 mm Height: 1,232 mm
The capacity of these standard boxes is: 1,000 kg for onions and 1,250 kg for potatoes
Slightly lower boxes are used for holding more delicate produce; but the lower the capacity, the higher the price per kg of the product.
Boxes for pressure ventilation systems must have hermetically sealed sides. Boxes for suction ventilation systems must have openings covering 8 to 10% of the base and sides.
Boxes for suction ventilation systems must have grooves running along 8 to 10% of the sides.
Boxes in a storage facility with a suction ventilation system.
This box has grooves along all sides. To ensure proper ventilation, there are grooves along 10% of each side. The box has a fairly regular wooden base. We say fairly because the base needs to be strong enough to stack up to six boxes.
The dark blue rectangle is a small board where the grower can write information about the contents of the box using chalk. The box also bears the name of its owner.
Note that the four corners and the longer sides are all reinforced; this is so that the box can support up to five more being stacked on top. The edges of the support planks have been smoothed, in order to avoid damage to the product.
2. Boxes for a for a storage facility using pressure ventilation.
Boxes of onions for a storage facility using pressure ventilation.
The box for the pressure ventilation system has hermetically sealed base and sides.
The shorter sides are one inch lower than the longer sides, meaning that stacked boxed have a continuous gap between them. This allows the air to flow (after passing through the pressure wall) through the bases into the stacked boxes, rising through the base (without being able to go down), passing through the produce and escaping through the grooves in the shorter sides. With this system, the air which passes through a box barely passes through the rest. It is also difficult for mouldy produce to spread from one box to the rest with this system.
Boxes of onions in a storage facility against a pressure wall.
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For anyone who is considering investing in a storage facility for onions or potatoes, boxes can often be surprisingly expensive.
One box, bin or container of this type can cost between $150 and $160. That's a lot of money. But to work out its true cost, the following must be considered:
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