Our first subject is the corrugated board of all the substances and typologies, color avana or white.
The corrugated board is a rigid material constituted from the connection, obtained with adhesive, of three or more paper sheets , some of which it has been preventively conferred a waved shape. In its simple structure the cardboard therefore is constituted from two surfaces of flat papers or stiff ones,distanced from each other from a surface of corrugated paper to which they are joined by with glue. We will have in such case a simple wave cardboard , or cardboard with single wave.
There is an other cardboard structure much more used. It is compased of 2 flat exsternal surfaces, and 2 of corrugared surfaces inside, connected between each others from one third falt surface.
We will have , in this case, a cardboard called double wave or double-double or, still, more commonly, even if improperly, triple.
We can tell that the corrugated structures are produced and commercialized for specific uses, and they can be simple or more complex than those examined.
Certainly, the simple corrugated paper is obtained from the connection of one flat surface with a corrugated one.
The absence of the second flat surface does not confer rigidity to the system, and in fact the corrugated paper, normally commercialized in coils , ant it is used to wrap and to protect some products with particular shapes.
The composition of the cardboard triple wave is much more complex. Inside of the two flat external surfaces , the corrugated sufaces become three, connected from each other from two flat sufaces.This kind of cardbord is utilised for specific uses.
THE WAWES
They have to distance the covers and to maintain between them, the same equidistance as much as possible in the course of the life of a corrugated bord packing . In order to maintain their original “thickness”, the waves must be rigid and to have one good resistance to the crushing in plan.
The typical structure of the waves permeet at best to take advantage of the characteristics of resistance of the employed papers.
In the field of the building it is applied the concept to replace beams or massive supports with outlines equally resistant but lighter and much more economic. The same thing happens with the corrugated cardboard.
Every undulation assumes the role of a ribbing or column effect, and each of them will give just the contribution to the total resistance of the product.
The characteristic shape of the undulations assures a sure elasticity that it permeets to damp the blows and to act like bearing between the source of the collision and the contained product.
Some of the most important performances required to a corrugated cardboard packing are: the resistance to the stacking, or the resistance to the vertical jam.
TYPES OF WAVES
Medium wave (C): This wave has a thickness between 3,4 and 4,5 millimeters.The thickness of the cardboard influences directly on the resistance of vertical jam of packings, and it increases the damping power. The wave B, is not very resistant to the jam in plan, and also the quality of the print is not very high.
Lower wave (B): it determines a cardboard with thickness between millimeters 2,5 and 3,4.The number of waves contained in a linear meter assures one good resistance to jam in plan and a good quality of print. Its reduced thickness does not favor the resistance to the vertical jam.
Micro wave (E): it determines a cardboard with a thickness inferior to 2,5 mm.
Home | Company | Processing | Products | Links
