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Cardboard glued for interlayer: what it is and what it is used for

Cardboard glued for interlayer: what it is and what it is used for


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The glued cardboard interlayer may appear as a niche material that many do not know what it is and never will, but for those who find themselves in the situation of having to manage the walls of a warehouse or a similar space with a high humidity continuous, this becomes salvific.

Let's find out better what it is and what are the advantages in order to be ready, when needed, to use it without too many indecisions.

Cardboard glued: what it is

The glued cardboard is a special cardboard. Compared to the traditional one, to prepare it a mixture is used that has a mixture of cationic glue water based. This substance joins us to the normal cardboard mixture in order to create a “magical” polymer network. The purpose of this network is to prevent water from being absorbed by the cardboard itself, causing even disastrous consequences.

To obtain this particular type of cardboard, we always start from a normal base of recycled cardboard, created by passing the various layers of dough into pressing drums. Then we move on to"Waterproofing”Of the material we obtained, only after it came out of the drums.

When the compound formed by the paper and additives is extracted from the pulper to then be inserted into a mixer, it still has a liquid or semi-liquid form and it is precisely in this phase that we go to add glue, massively.

After this step, the resulting dough is passed under the drums that create the layers of recycled cardboard glued. In truth not all the layers are glued, the cardboard is so called but to have the characteristic waterproofing it is only the “external” layers, those that we touch, those that are in contact with the goods and with any walls of the warehouse or of the space in which it is stored.

Glued cardboard: what it is for and advantages

Now that we understand how the glued cardboard, let's see what is the situation in which it can be useful. As we have mentioned, it is especially necessary when the humidity is likely to be higher than normal and we are faced with it the problem of condensation. If it is abundant, this phenomenon that we are used to noticing instead in a slight form, can even get to wet the interlayers of the cardboard.

There are several factors that can affect the gravity of the situation on which we are called to intervene. There is the seasonal one, on which the temperature, humidity and the frequency with which high humidity can occur, above all. And then it is very important to also take into account the goods that are contained in our cartons, it can be food, or not, and if so, products that are intended to be frozen or to end up in the fridge.

As long as condensation is something that makes us find some droplets deposited on our cardboard, you can let it run, but if the humidity level becomes higher and even gets to wet the inner layers of the cardboard, it is necessary to intervene because on the one hand our casing becomes unusable, on the other hand, the products inside can also be damaged. With completely flaked cardboard packs, reduced to little more than pulp, you find yourself having to reorganize the entire set-up facing a great waste of time and also of material.

The advantages of the glued cardboard they are therefore easy to say, it allows us to save material and work time, making the set-up more organized and efficient. With its protection against condensation we also have less danger of finding damage to products that were kept in our warehouse that we can now be sure that they will arrive intact for distribution.

The COBB 60 test to measure the resistance of the glued cardboard to humidity

The magic of paper mills remains in our imagination but today if we have to think about the production of paper and cardboard that allows us to have these products in distribution, with the desired characteristics and quantities, we must bear in mind that there are deep ones scientific basis at the base of their manufacture. Skills in physics, electronics and mechanical engineering are needed, at least, to obtain products that have the advanced performance that we demand, just as in the case of glued cardboard.

For this material, for example, it is essential to have the parameters that allow us to understand if the final product is really effective and suitable for use. We therefore speak of absorption factor. This is what we need to evaluate to be sure that this special cardboard works. To measure it, an experimental verification is carried out called "COBB 60 "test, an international industry standard.

How do you proceed? It is a quick process that requires a small sample of cardboard, a square decimeter is enough. It is weighed and then placed in contact with a deciliter of water for sixty seconds and then weighed again to see how much it has increased. By evaluating the difference in weight, the absorption factor can be estimated.

On average, if we take a traditional cardboard and subject it to this test, we will see that its weight will tend to double, while the sized one will show a weight gain of several percent less, it will not become even one and a half times. In general the rule applies that going to increase the amount of cationic glue inserted into the mixture, the impermeability of the cardboard obtained increases and the absorption factor lowers. Technically, you can even get to zero but to date it is not necessary because the treatment on the two interfaces is sufficient to defend against humidity.

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