| Corrugated cardboard |
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Folding line (1)To make folding – at the right place – easier, all folding lines on the collar are pre-folded. This means that the collar will fold by folding it backwards around the prefolded line. Right hand flap (2)The flap on the right side overlaps (on the outside) with the flap furthest to the left when the collar is inserted in the edge of the Procona container. This prevents the flowers in the container slipping outside past the collar. Moreover, the sharp edge on the inside, on the sides of the collar has been taken away (this could damage flower heads). Corners left and right below (3)The corners on the left and right side of the collar have been removed – the one on the left to ensure that the right flap fits easily on the edge. The corner on the right side has been removed – this is to prevent it catching behind the outer edge of the Procona container when the right-hand flap is folded into the edge. Printing (4)All standard Procona collars carry a printed message comprising: Moreover, for every type of collar a different colour has been selected for standard printing: Amsterdam and Valencia: Green Amsterdam and Valencia with Topframe: Blue Florida: Red London: Black
What is corrugated cardboard?
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The corrugated cardboard collar is an important part of the Procona packaging system. The Procona containers are made in such a way that they remain sufficiently rigid under all circumstances. They can be stacked up to 240 cm. Moreover the packages can be transported under refrigeration, for longer periods, e.g. in trucks. This means that the packaging should be very durable. 
| Type flute | Height flute | Number of flutes per metre |
| A | 5 mm | 110 |
| B | 3 mm | 150 |
| C | 4 mm | 130 |
| E | 1,2 mm | 300 |
| F | 0,7 mm | 450 |
Box shape
The design of the box contributes to its rigidity. In general a standard box mainly owes its rigidity to its corners. The direction of the corrugation is also important for the general rigidity of the box.
Conditions for use
Corrugated cardboard is made of paper. Hence, the strength of the corrugated cardboard depends on the circumstances affecting the corrugated cardboard. Moisture and paper do not go well together. Damp paper loses much of its rigidity. Corrugated cardboard is made by gluing loose sheets of paper – and the glue also loses strength in damp conditions.
Procona collars
Collars for Procona are made of C-corrugated cardboard. The type of paper used is the best available.
To monitor the quality of Procona collars Pagter Innovations has regular tests carried out by the independent Belgian Packaging Institute. These tests involve measuring the collars maximum load (compression) under severe conditions. This means two days conditioning at 20° Celsius and 90% relative humidity. This is equivalent to the actual (extreme) conditions in which the collars are used. The Belgian Packaging Institute also investigates the composition of the collar – in terms of paper type and grammage.